Dometic Truck Remote Auxiliary A/C

Transcription

1 Dometic Truck Remote Auxiliary A/C INSTALLATION OPERATION Designed specifically for truck sleepers Revised: L-2535

2 Table of Contents Remote HVAC System for Truck Sleepers Introduction Notice...3 Drawings and Diagrams...3 Air Conditioning Basics...3 The Effect of Outside Air Temperature...3 Remote System Components...3 System Controls...4 Condensate Drain...4 Air Flow...4 Remote HVAC System for Truck Sleepers Installation Before You Start 5 Introduction...5 Required Tools...5 Getting Started...5 Installation of the CHEB in the Cab...5 Installation for Freightliner Trucks Century, Columbia, and Coronado Series...6 Installation of the CF Assembly Outside the Cab...6 Installation for Freightliner Trucks Century, Columbia, and Coronado Series...7 SMXir Installation 7 Remote HVAC System for Truck Sleepers Operation Starting Up Your New System 8 The SMXir Keypad/Display...8 The SMXir Remote Control...9 SMXir Basic Operation 9 Power On...9 System Off...9 Selecting Setpoint...10 Displaying Temperature...10 Cool Mode...10 Heat Mode...10 Automatic Changeover...10 Manual Fan Speed Control...10 Automatic Fan Speed Control...10 Using The Humidity Control Routine...10 Anti-Ice Routine...10 Programming the SMXir System 11 Factory Memory Reset...11 Fahrenheit/Celsius Display...11 Compressor Differential...11 Fan Response Differential...11 Low Fan Speed Adjustment...12 High Fan Speed Adjustment...12 Fan Mode...12 AC Line Voltage Calibration...13 Temperature Calibration...13 Humidity Control Program 13 Programming The Time Period...13 Programming The Dehumidification Time...14 Recommended Humidity Control Settings...14 Fault Shutdowns and Error Messages...14 Fault Codes...14 High Pressure Shutdown...14 Low Pressure Shutdown...14 Low Voltage Shutdown...14 Software Error...14 Determining Your Software Version Number...15 System Maintenance 15 Troubleshooting 15 Owner s Limited Warranty 17 Description of Figures 19 Voltage and Frequency Requirements This air conditioning system must operate within guidelines recommended by the manufacturers of the compressor, blowers and fans, and other electrical components. Dometic s requirements are: Voltage: Recommended: 115 V Lowest voltage allowed: 104 V Highest Voltage allowed: 126 V Frequency: Recommended: 60 hz Lowest freq allowed: 57 hz Highest freq allowed: 63 hz Generator Commissioning and Maintenance: Generators are set at the factory to conform to our above guidelines. Conditions can change the generator settings in the field. The generator may not conform to our requirements even though it is new and recently installed. Part of the responsibility of the generator installer and part of regular maintenance is to check that the generator conforms to the above while running the air conditioner in the cooling mode. In other words, with the air conditioner system on and the compressor running, the genset must be operating within the range of values, above. Failure to have the generator running in this range will cause damage to tubing and to the unit not covered by warranty and the warranty may be voided. Shore Power Usage: Shore power connection should provide power within the same guidelines, above. A power cord that is too long and/or too small of a wire (gauge), could cause a voltage drop at the unit which would affect performance, could cause damage, and may also be a fire hazard. Wire gauge requirement are as follows: 25' cable: 12 gauge 50' cable: 10 gauge 14 gauge not Recommended Failure to use shore cables of this gauge may cause the warranty to be voided. L English

3 Remote HVAC System for Truck Sleepers Introduction Warning This manual contains essential information concerning the safe and proper installation and operation of your air conditioning system. Read and follow all safety instructions in the manual and on the unit to help reduce the risk of accident or injury or death. If there are any statements or procedures that you do not understand, contact your dealer. Notice US federal law prohibits the intentional release of refrigerant gases into the environment, including the R-22, R134a, and R417a refrigerant used in some air conditioning systems. Special care must be taken when installing, charging, and servicing this equipment to prevent any loss of refrigerant. Only EPA certified technicians with the proper equipment should perform service on the refrigerant circuit. Drawings and Diagrams The figures that are referenced throughout can be found at the back of this manual. In addition, this equipment may be shipped with specific installation sheets or wiring diagrams that may supercede the information located herein. Air Conditioning Basics The basic principle of an air conditioner is the movement of heat. In a direct expansion (DX) air-cooled air conditioner, heat is transferred from the inside air to the refrigerant gas in the evaporator coil. The refrigerant then is pumped by the compressor to the condenser coil where the heat is released to the outside air. The heat exchange process relies on the movement of both inside air through the evaporator coil and outside air through the condenser coil. If airflow in either coil is compromised, the efficiency of the system will drop. Continued usage with a partially blocked air system will eventually damage the unit. Severe airflow blockage will cause the unit to over-heat, activate the unit s safety devices, and shut the unit off. Part of the cooling process, in addition to lowering temperature, is the removal of moisture from the air. This lowers the humidity, which makes the area feel more comfortable and helps keep the compartment dry. The Effect of Outside Air Temperature The performance of the air conditioner is dependent on both outside and inside air temperatures. The unit is designed for full capacity at 95 F (35 C) outside temperature. If the temperature rises above this, the performance of the unit will drop. However, the unit should still provide some cooling even in temperatures as high as 125 F (52 C). Heat is provided by an electric heat element and heat output is not affected by outside temperature. These systems are designed to cool or heat most common sleepers, but may have limitations due to sleeper size, insulation, the amount of glass, and the climate where the unit is operated. Some tips to help maintain desired temperature are: Park in a shaded area when trying to cool. Cover windows with shades or towels to block direct sunlight and limit heat transfer through the glass. Keep windows and doors closed. Close curtain between sleeper and cab. Reduce use of heat-producing appliances. When heating, park in a location that blocks prevailing wind. Note - Moisture: Dometic will not be held responsible for damage caused by condensation of moisture on surfaces within the compartment. Humid outside air contains water vapor, which, when the outside air enters a cooled space, can condense on cool surfaces such as windows, walls, or metal objects. Normal operation of the air conditioner removes moisture from the air, and keeping openings to the outside closed should reduce secondary condensation. Remote System Components Remote systems, also called split-gas, have the air conditioning components mounted on two separate chassis that are installed in different locations and are connected by flexible or copper refrigerant tubing. The condenser/fan unit, or CF, consists of the air-cooled condenser, fan and electrical components. It is mounted under the cab, outside the sleeper. The compressor/heater/evaporator/blower unit, or CHEB, includes the evaporator coil, compressor, a blower, and electric heater, all mounted on a drip pan. It is installed in the sleeper, under the bunk. L English

4 Sleeper compartment air is drawn into the CHEB unit through a return air grill, it is cooled or warmed and blown back into the compartment through a ducting system. An air filter is located on the cooling unit and must be cleaned regularly. System Controls Q-Logic controls are advanced microprocessor systems that provide a more comfortable environment and better system protection than mechanical controls. In addition, over 20 programmable functions allow the user to customize the system to suit the specific needs of their environment. The system consists of the following components: Power/Logic (P/L) board - Monitors and controls all functions of the air conditioning unit. Keypad/Display - Easy to read user interface with a digital readout and LED indicators. Temperature-Sensing Element - Air temperature is monitored by a temperature-sensing element (TSEP) that plugs into the power/logic board. Connecting Cable - The keypad/display connects to the P/L board with a CXP connecting cable. Condensate Drain When the air conditioner is running, moisture is removed from the air by the evaporator coil. This condensation is then caught in a drain pan and must be drained off. In humid climates the system can produce a large amount of condensate water that could cause significant damage if the drain system doesn t work properly. Warning The drain should have the P-Trap attached which will create a water seal to prevent hazardous or deadly gasses from entering! Air Flow Air flow within the sleeper is paramount to proper systems performance. For correct parts, contact Dometic Environmental or your retailer. Improper air distribution will result in less than desired operation. Recommended Duct and Minimum Grill Sizes BTU/Hr Return Air (sq in/cm) Discharge Air (sq in/cm) Recommended Duct Size (in/mm) 7,000 8/520 50/325 5/127 10, /650 60/390 5/127 14, /936 80/520 7/178 L English

5 Remote HVAC System for Truck Sleepers Installation Before You Start 1. Read installation and operating instructions carefully before attempting to install and operate your air conditioning unit. 2. The manufacturer will not be liable for any damages, injury, or death incurred due to failure to follow the instructions. 3. Installations must always comply with the National Electrical Code, and any state/local codes or regulations. 4. Only a qualified service technician must service this unit. Any attempt to service the unit otherwise may void the warranty. 5. Make sure that you have the required parts and tools to complete the job, as this will help keep the installation time to a minimum. Warning Improper installation could damage equipment, endanger life, cause serious injury, or property damage. If you have any doubts that you cannot complete this installation safely and as the directions state, find a qualified technician to do it for you. Make sure that power is turned off at the source before making any connections. Failure to do so could cause injury or death. Introduction The system you have just purchased comes with all the parts necessary to complete the installation. Tool requirements will be given. The inside part of the system, Compressor/Heater/ Evaporator/Blower assembly or CHEB, is designed to fit into the compartment under the bunk. The outside unit, Condenser/ Fan assembly or CF, will fit in between the supports under the cab. The unit will bolt up to the floor. The CHEB and the CF are connected by two refrigerant lines, and one power cord. Required Tools Drill motor Hole saws: 1-5/8", 1-7/8" and 2-1/2" Drill bits: 1/8", 5/32", 9/32" Nut drivers: 1/4", 3/8", 5/16" Phillips head screwdriver Open-end wrenches: (2) 7/16", (1 each) 5/16", 13/16" & 3/4" Getting Started Get started by unpacking all of the parts in the kit. Familiarize yourself with the parts that are included, their stated use, and the installation manual. Pick out and separate the parts that are needed for the part of the installation in the cab, and the parts that are required outside the cab. NOTE: Care must always be exercised when dealing with electricity. Wiring should be done only by a qualified technician. Contact an electrician if you have any questions. Refer to the wiring diagrams in the back of this manual (Figure 7) or the diagram that is located inside the electrical panel of the unit. The unit should be wired with the minimum wire sizes listed on the wiring diagram. Always refer to NEC or state/local codes for further wiring recommendations. Installation of the CHEB in the Cab 1) Lift the bunk and locate a suitable area for the CHEB. Remove floor mats. Consider structure of the cab. 2) Use the template provided to cut necessary holes. If there is a rubber floor mat, make sure to cut holes in it to match the holes cut into the cab floor. Use 2-1/2" hole saw to cut through floor mat and the 1 7/8" through the metal floor. Install snap-in grommets into three large holes in the floor. (See Figure 2 for manufacturer s instructions.) 3) Go no further with the installation of the CHEB at this time. Jump to the next section, Installation of the CF Assembly. 4) Lower the compressor end of the CHEB into position first. Ensure that the drain hole in the CHEB is over the 1-5/8" hole in the cab floor. 5) Mount the CHEB to the cab floor using the stainless steel clips and ¼" x 1¼" bolts, washers, and nuts provided (Figure 1). 6) Route refrigerant lines through the two larger grommets. Take care not to crimp or over-bend the lines. Connect to CHEB and tighten by hand first, then use 15/16", 13/16", 3/4" open-end wrenches.torque to ft. lbs. Do not over-tighten. The condenser power cable (small black cable with gray plug) should also be routed through one of the grommets. Caution! When connecting this lineset, a hissing sound may occur if the fittings are not exactly aligned. Do not stop the tightening process! Continue tightening and the hissing will stop. There is no danger to the installer. Torque wrench may be also be required L-2324 Installation 5 English

6 7) Mount the electrical box in the cab in a suitable location. Secure with four #8x½" screws and the 1/4" nut driver. Consider first where you are going to mount the SMXir keypad/display and if the connecting CXP cable is long enough to reach from electrical box to display. 9) Plug the wiring harnesses from electrical box into matching plugs on CHEB. They are different, so miss-wiring should not happen. 10) Connect the temperature sensor wire (TSEP, it looks like a phone cable) from the front of the CHEB to the electrical box on the left-hand side in the slot marked TEMP (Figure 7). 11) Connect power cable, to the power distribution box. 12) Use a jigsaw or other device to cut holes in the front bunk for the discharge and return air grilles. The discharge grille (the smaller of the two) should be as close to directly in front of the CHEB as possible, but not in a manner as to be blocked by open cabinet doors. The return air grille should be located as far away from the disharge grille as possible. Hint: Grille is removable from its frame for mounting (Figure 6) 13) Mount grille frame with four #8x¾" sheet metal screws. 14) Insert grilles into their frames. Vanes for discharge grille should point up, while vanes for return air grilles should point down. 15) Use duct and large hose clamps provided to attach the discharge grille to the duct adaptor on the CHEB. Use only as much duct as needed. Do not bunch up extra. 16) Locate a suitable place for the keypad/display, such as a cabinet. Follow the mounting directions included with the control. 17) Route CXP cable from control to the electrical box. Plug into hole marked Display. (Figure 7) 18) CHEB installation is complete. Return to Installation of CF Unit and resume at step 6. Installation for Freightliner Trucks Century, Columbia, and Coronado Series 1) The evaporator unit (CHEB) will fit best in the center compartment under the bunk. To use the supplied template, measure 8" from the bottom of the rear wall of the plastic bunk, and make a mark. This mark will be the back of the CHEB. The holes for the refrigerant lines should be between the rear of the CHEB and the rear wall of the sleeper. Place the template down with the rear outline of the CHEB over your mark, and adjacent to the center/driver compartment divider wall. 2) When drilling the holes through the floor, use the 2-1/2" hole saw to cut through the plastic. Then use the 7/8" hole saw through the metal floor. 3) In the area shown by the template to be where the CHEB will be installed, trim away the rubber floor mat. 4) Cut the hole for the supply air grille in the Driver side of the front of the bunk. Install grille with supplied screws. 5) Cut the hole for the return air grille in the Passenger side of the front of the bunk. Install grille with supplied screws. Continue with the instructions on previous page Installation of the CHEB in the Cab. Installation of the CF Assembly Outside the Cab Note: The condenser may be mounted underneath the sleeper (mounted to the sleeper, not the frame) or it may be mounted to the rear of the sleeper. If you mount a generator under a sleeper that has fairings or you mount a generator radiator under a sleeper that has fairings, you may not put the condenser under the sleeper. 1) Locate the template for the CF. Affix it to the underside of the truck between the cab support structures. Realize that the lowest point of the CF must not hit frame structures, as the cab moves independently from the frame. You may want to completely discharge the air bags to confirm you have a suitable area for placement. 2) Drill holes as instructed by the CF template. 3) Inflate the cab air bags and raise the cab to its highest safe position. 4) Under the truck, take the CF unit with the QCs facing toward the large holes you cut for the CHEB. Position mounting legs over the holes you drilled, and use one 1/4" bolt and one 1/4" fender washer to push down through each hole. Secure on bottom with a 1/4" washer and a lock nut. Tighten with 7/16" wrenches (Figure 3 and 4). 5) Go back and finish CHEB installation at step 4. 6) Route the refrigerant lines to the CF and connect. Tighten by hand first, then use 15/16",13/16" and 3/4" open-end wrenches. Torque to ft. lbs. Do not over-tighten. Correct torque (not more, not less) is very important. Caution! When connecting this lineset, a hissing sound may occur if the fittings are not exactly aligned. Do not stop the tightening process! Continue tightening and the hissing will stop. There is no danger to the installer L-2324 Installation 6 English

7 7) Install threaded plastic drain hose fitting into the drain hole of the CHEB. Then attach the p-trap to the fitting, and secure with small hose clamp. Use 5/16" nut driver to snug. 8) Route the fan power wire coming from the electrical box, through the small grommet, to the CF and connect. (This is the small black wire with grey plug.) 9) Using both supplied single-hole clamps, securely fasten the refrigerant lines and power cable for the CF unit to the hat section. Secure the clamps with two #8x½" screws and the 1/4" nut driver. Both hoses and the wire are contained within each clamp. Make sure that hoses will not rub anything. If needed, use cable ties to secure any extra hose to itself. Always use horizontal loops, never vertical loops (Figure 5). The installation of the system is complete. Installation for Freightliner Trucks Century, Columbia, and Coronado Series 1) The condenser assembly (CF) will fit best under the sleeper, in the center section near the rear of the truck. The unit should be shifted towards the Passenger side, within 3-3/4" from the Passenger side cab support to provide room for the refrigerant lines to come through the cab floor. 2) Use the supplied template to mark for the required holes. 3) You will need to remove the Passenger side dividing wall under the bunk to fasten the bolts. To do this, remove the screw at either end of the wall, then lift. Find the pilot hole you drilled from the bottom, and drill a hole in the plastic large enough so that the bolt will fit down to the metal. Tighten, and replace wall. Continue with the instructions on previous page Installation of the CF Assembly Outside the Cab. Keypad/Display Installation The keypad/display may be mounted in any convenient location, on a bulkhead or in a cabinet or closet, for instance. Choose a location that is easy to reach, but not in the way of daily routines. Make sure that the mounting location is within the display cable (CXP) length of the remote mounted electrical box. Route the CXP cable prior to mounting keypad. Use the enclosed instructions for mounting the keypad. Drill a hole for the CXP cable to feed through. Mount the display backing plate centered over that hole. Run the cable through the hole and plug it into the display. Then snap the display onto the backing plate, being careful not to crimp the cable. The other end of the CXP should be plugged into the circuit board/elec box socket marked DISPLAY. The other cable that needs to be plugged into the circuit board/elec box is the TSEP (temperature sensing element). That cable is mounted on the unit in front of the evaporator coil in the return air stream and must be plugged into the socket marked TEMP. Both cables are available in a variety of lengths, please contact your dealer if need be. Although the CXP looks like a standard telephone cable, it is not; phone cables will not work as a display cable. Warning Make sure all power is off before opening any electrical box. Warning The interconnect cable (CXP) and temperature sensor cables (TSEP) transmit low voltage DC signals, and outside interference can affect their operation. Do not route these cables beside A/C power cables, high voltage wiring, or antenna wires. Keep the cable runs as short as possible to reduce the chance of interference. Warning Seal all penetrations through Cab to prevent hazardous gasses that can cause injury, sickness or death from entering the cab. L-2324 Installation 7 English

8 Remote HVAC System for Truck Sleepers Operation Starting Up Your New System Qt Quick Start Use the COOL, HEAT or AUTO button to start desired function. To adjust setpoint, push plus (+) or minus (-) button to increase or decrease temperature in single increments or press and hold either button to scroll temperature until desired setpoint is reached. The plus button allows the setpoint to increase and the minus button decreases the set point. The fan speed, automatically, adjusts to the temperature difference between the set point and inside temperature, or it can be set manually by pushing the fan button. The Qt Keypad/Display The Qt keypad/displays are arranged for logical operation. See next page for keypad/display diagrams. 1. Data Display Large LED readout that provides indication of current setpoint, temperatures, programmed values and fault/error messages. 2. Mode Key Enables user to cycle through the different modes (refer to indicators). Modes sequences begin OFF, COOL, HEAT, AUTO, OFF. 3. Cool Mode Indicator Lights when COOL mode is manually selected or when compressor is on during AUTO mode. 4. Heat Mode Indicator Lights when HEAT mode is manually selected or when heating element is on during AUTO mode. 5. Auto Indicator Lights when system is in automatic changeover mode. It will switch from cooling to heating as needed. Fan speed is automatically selected. 6. Plus (+) and Minus (-) Keys Raises or lowers the setpoint. In programming mode, these keys change function numbers and corresponding values. Press and hold keys for large changes. 7. Fan Key Selects manual fan control. In the OFF mode, pressing this key will start the fan in manual mode. 8. Off Indicator Lights when the system is de-energized (by pressing the MODE key). Data display remains on. Setpoint adjustments, temperature displays and manual fan control remains active when the system is in the OFF mode. Qt Display Planel L-2324 Operation 8 English

9 9. Fan Speed Indicators Row of four small LEDs beside fan key. The top light indicates the fan is in auto mode, the bottom light indicates low fan speed, and the other two lights indicate medium and high speed. When auto fan LED is not lit, fan is in manual mode and fan speed can be adjusted by pressing the fan key. 10. Cooling or Heating Indicator When COOL or HEAT mode is manually selected: the dot in the upper left corner in the data display will illuminate when the compressor is running in cool mode or the heater element is running in heat mode. Note: this indicator does not function during AUTO mode. The Compressor and heating element power up is indicated by the HEAT and COOL mode indicator lights. See sections 3 and 4 above. Definitions LED- light emitting diode. A light used to indicate mode or operating status. Setpoint- The selected temperature to be maintained in the area being heated or cooled. Qt Basic Operation Power On When AC power is applied to the system at the circuit breaker, the SMX microprocessor performs a self-check and retrieves from permanent memory the last operating configuration. This process takes about four seconds, after which the system will begin operating just as it had been when power was last turned off. Note: These systems have a 2-minute compressor restart delay to allow the system refrigerant pressures to equalize before starting. This delay begins when the compressor shuts down for any reason. This delay is increased by the Compressor Time Delay function so that vehicles with multiple units can be set to prevent all units from turning on at the same time if power is lost and restored. System Off Press the OFF key to turn the system off. Note that the data display remains energized even when the system is off. The fan can be turned on manually when the system is in the off mode. Note The SMX has built-in protection against sudden power interruptions. The system automatically stores the current operating configuration in permanent memory every time you make changes. (The new operation mode must be in affect for 30 seconds before it is saved into permanent memory.) When AC power is lost, the SMX system retains these settings, and when AC power is restored it resumes operation using the same settings as before. L-2324 Operation Selecting Setpoint Press either plus (+) or minus (-) key once and the setpoint will be displayed. Press either key once more to change the setpoint. Pressing and holding either key will scroll the set point temperature. While in set point mode, a dot will appear in the top-middle of the display. After 3 seconds of no key presses, the new setpoint is applied, the dot disappears in the display and the current internal temperature is shown. Displaying Temperature When the unit is in any mode such as OFF, HEAT, COOL or AUTO, the display will show the internal temperature. In order to see the internal temperature when the unit is in programmed mode, press the fan key twice to save existing data and exit program mode. Cool mode Press the mode key until the COOL LED lights. Note that the internal temperature must be above the setpoint by approximately 3 degrees before the compressor is energized and cooling begins. At this point a dot will be illuminated in the upper left corner of the display indicating the compressor is on. When the internal temperature equals the setpoint the compressor is de-energized. The dot will go off. When the compressor cycles off in any mode, a two minute compressor delay is initiated. When the compressor is called to run again, it will be delayed for the remaining time left in the two minute delay and shown on the display. Heat Mode Press the mode key until the HEAT LED lights. Note that the internal temperature must be below the setpoint by approximately 3 degrees before the heat element is energized and heating begins. At this point a dot will be illuminated in the upper left corner of the display indicating the heating element is on. When the internal temperature equals the setpoint the heating element is de-energized and the dot will go off. Note: when the system is in AUTO mode, the HEAT LED will illuminate when the heat element is energized. When the heat element is de-energized, the heat LED will go off. Auto Mode Press the mode key until the AUTO LED is lit. Note that the cooling or heater LED will be lit along with the AUTO LED when the compressor or heating element is energized. If the internal temperature equals the setpoint, only the AUTO LED will be on. 9 English

10 Automatic Fan Speed (internal air flow) The internal fan runs continuously in any mode unless the system is turned off (except in Power Saver mode, see heading Power Saving Mode.) Fan operation in continuous AUTO mode is automatic (top LED will be lit) and is based on a temperature differential of internal temperature and setpoint. In COOL mode or AUTO cool, the fan speed increases one speed for every degree of change of internal temperature above the setpoint. After 3 degrees above setpoint is obtained, high fan speed is reached. As internal temperature decreases or approaches setpoint, the fan speed will decrease to medium speed at 2 F above setpoint and low speed at 1 F above setpoint. Upon a further drop in internal temperature, the compressor cycles off and the fan will continue to operate at low speed. In HEAT mode or AUTO heat, the fan increases one speed until 3 F below the setpoint is obtained. At that point the fan will operate at medium speed. As the internal temperature increases or approaches the setpoint, the fan speed will decrease to low speed and stay at that speed. This cycle is continuous using the auto function depending on the mode the system is in. Manual Speed Control OFF MODE: pressing the fan button will start the blower in speed 1 (slow speed, one LED lit, no AUTO fan LED). Subsequent presses of the fan key will move the fan speed up one speed at a time until speed 3 is reached (high speed) and then it will move down one speed at a time until speed 1 is reached. At this time one more press will turn fan off. No indicators will illuminate. At high speed, 3 LEDs will be lit, medium speed, two LEDs will be lit and low speed, only the bottom LED will be lit. Note: the user cannot return the fan speed to auto mode while the control is in off mode. COOL, HEAT or AUTO MODE: the default is auto fan mode (see automatic fan speed section). When fan button is pressed, the fan will go to manual operation at speed 1 (slow speed). Subsequent presses of the fan key will move the fan speed up one speed at a time until speed 3 is reached (high speed) and then it will move down one speed at a time until speed 1 is reached. At this time one more press will return fan back to auto mode. During heating mode operation, if in auto fan mode, maximum speed is medium speed. However, if manual fan mode is initiated, then all three speeds are used. Adjusting Display Brightness Press the mode and plus (+) keys simultaneously. Subsequent presses will adjust the LED from a high, medium and low brightness. Programming the Qt Digital Control System Qt control systems are programmed at the factory for optimum values. The following programming changes are to be made by a trained technician or with the aid of a factory technician. All programming is done in the off mode. While in the off mode, enter program mode by pressing the MODE and minus (-) keys simultaneously for 3 seconds. The display will flash PO during those 3 seconds. After the 3 sec flash, a flashing 1 will appear in the display. This 1 is function #1. See the table below. While in program mode, the OFF LED will flash indicating program mode. Scroll through the different functions #s by pressing the plus or minus keys. When the correct function # is displayed, press the mode key to display the current value. Adjust this value by using the plus or minus key. Note: some functions denote values or test operations that cannot be adjusted. Press the fan key to save information. This action will return the user to the current function #. Continue to change and/or observed values by scrolling as described above or press fan key again to exit program mode and return to OFF mode. When program mode is exited, the OFF LED stops blinking and remains lit. Factory Memory Reset This feature can only be used in the OFF mode only To restore programmed functions to factory settings: Press the plus (+) and minus (-) keys simultaneously for 3 seconds. During the 3 seconds, the display will flash 00, and then a 1 will alternate across the screen until the reset is complete. Fahrenheit/Celsius Display Factory Default: Fahrenheit While in OFF mode, enter programming mode by pressing MODE and minus key for 3 seconds. The display will flash PO during the 3 seconds. After the 3 second flash, a flashing 1 will appear on the display, which is function #1. While in program mode, the OFF LED will flash, which indicates program mode. Scroll through the function # by pressing the PLUS or MINUS key until #2 is displayed. Press the MODE key and the current value is displayed F or C. use the PLUS or MINUS key to change value and then, press FAN key twice to save information and exit programming mode. Low Fan Speed Adjustment Factory Default: 38 The lowest fan speed can be adjusted to suit individual preferences. For instance, the user may wish to decrease the low fan speed setting in the sleeper compartment to minimize fan noise. L-2324 Operation 10 English

11 Programmable Function Chart Programmable Function Qt Display indicators Function # Factory setting Range Fahrenheit/Celsius Displays F, OFF mode flashes 2 F F or C Low Fan Speed High Fan Speed Fan Mode AC Line Voltage Calibration Temperature Calibration Software Version Software Revision Displays, 38 OFF mode flashes Low fan speed LED Displays, 60 OFF mode flashes All fan speed LED Displays, C OFF mode flashes Displays last two digits of line voltage, OFF mode flashes Displays inside Temperature OFF mode flashes Displays Version # OFF mode flashes Displays Rev # Off mode flashes to to 99 7 C C or I ±1% ±1% 10 N/A N/A 11 N/A N/A High Pressure Switch test Displays OA or FA, OFF mode flashes and COOL LED flashes (dot in upper left corner of display is lit if compressor is on) 12 OA=Okay FA=Fault N/A LED Test Displays all LEDs OFF mode flashes 13 Lights all LEDs N/A Displays ON =LEDs LED Sleep Mode Or SL =LEDs Dim settings 10 sec from last key touch 14 ON On=continuous SL=sleep mode Power Saver Mode Displays OFF mode flashes 15 =Normal Mode - =Normal mode P1=Power saver mode L-2324 Operation 11 English

12 To adjust low fan speed: While in OFF mode, enter programming mode by pressing MODE and MINUS key for 3 seconds. The display will flash PO during the 3 seconds. After the 3 second flash, a flashing 1 will appear on the display, which is function #1. While in program mode, the OFF LED will flash, which indicates program mode. Scroll through the function # by pressing the PLUS or MINUS key until #5 is displayed. Press the MODE key and the current value is displayed. The low fan LED will flash. Factory default is 38. Range is 2 to 57. Use the PLUS or MINUS key to change value and then, press fan key once to save information and continue programming or press the fan key twice to save and exit programming mode. Note: For most efficient operation of your system, you should normally keep the low fan speed at the highest possible setting consistent with a comfortable noise level. Running the fan speed too slow can damage the compressor. High Fan Speed Adjustment factory Default: 85 The High Fan Speed adjustment allows the user to set the maximum high-speed voltage to the threshold of the blower high-speed response. To adjust the high fan speed: While in OFF mode, enter programming mode by pressing MODE and MINUS key for 3 seconds. The display will flash PO during the 3 seconds. After the 3 second flash, a flashing 1 will appear on the display, which is function #1. While in program mode, the OFF LED will flash, which indicates program mode. Scroll through the function # by pressing the PLUS or MINUS key until #6 is displayed. Press the MODE key and the current value is displayed. All fan speed LEDs will flash. Factory default is 85. Range is 41 to 99. Use the PLUS or MINUS key to change value and then, press fan key once to save information and continue programming or press the fan key twice to save and exit programming mode. Fan Mode Factory Default: Continuous You can select the continuous fan operation or instruct the fan to cycle on and off with the system compressor. To select continuous or intermittent fan: While in OFF mode, enter programming mode by pressing MODE and minus key for 3 seconds. The display will flash PO during the 3 seconds. After the 3 second flash, a flashing 1 will appear on the display, which is function #1. While in program mode, the OFF LED will flash, which indicates program mode. Scroll through the function # by pressing the plus or minus key until #8 is displayed. Press the MODE key and the current value is displayed: C or I. Factory default is C. Use the plus or minus key to change value to I (intermittent) and then, press fan key once to save information and continue programming or press the fan key twice to save and exit programming mode. Note: For best operation using intermittent fan mode, relocate internal air sensor (thermister) from the return air duct to an inside wall to best sense room air temperature. Check with your dealer or call the Dometic Applications Department for more information. AC line Voltage Calibration The Qt control assembly has a built-in voltmeter that senses AC line voltage. The microprocessor automatically responds to sustain high and low voltages by shutting down the air conditioning system to prevent component damage. At installation, the Qt controller is calibrated to line voltage within +/- 1%. Low AC shutdown: During COOLING mode, if incoming voltage is 104vac (on an 115vac system) for > 3 minutes, the system will shut down and LO/AC will flash on the display. If incoming voltage is 207 (on a 230vac system) for > 3 minutes, the system will shut down and LO/AC will flash on the display. Low AC shutdown: During HEATING mode, if incoming voltage is 95vac (on an 115vac system) for > 3 minutes, the system will shut down and LO/AC will flash on the display. If incoming voltage is 200vac (on a 230vac system) for > 3 minutes, the system will shut down and LO/AC will flash on the display. High AC shutdown: During COOLING or HEATING mode, if incoming voltage is 127vac (on an 115vac system) for > 3 minutes, the system will shut down and HI/AC will flash on the display. If incoming voltage is 246vac (on a 230vac system) for > 3 minutes, the system will shut down and HI/AC will flash on the display. To check or calibrate AC line voltage: Turn off all on-board AC loads including air conditioner unit and measure the line voltage with an accurate voltmeter. While in OFF mode, enter programming mode by pressing MODE and minus key for 3 seconds. The display will flash PO during the 3 seconds. After the 3 second flash, a flashing 1 will appear on the display, which is function #1. While in program mode, the OFF LED will flash, which indicates program mode. Scroll through the function # by pressing the plus or minus key until #8 is displayed. Press the MODE key and the last two digits of the current value are displayed. If voltage is not correct, use the plus or minus key to enter the correct value and then, press fan key once to save information and continue programming or press the fan key twice to save and exit programming mode. L-2324 Operation 12 English

13 Temperature Calibration Typically, the temperature sensor is within +/- 2 degrees of actual room temperature. To check or calibrate the sensor: Turn AC unit off. While in OFF mode, enter programming mode by pressing MODE and minus key for 3 seconds. The display will flash PO during the 3 seconds. After the 3 second flash, a flashing 1 will appear on the display, which is function #1. While in program mode, the OFF LED will flash, which indicates program mode. Scroll through the function # by pressing the plus or minus key until #9 is displayed. Press the MODE key and the temperature value is displayed. Place an accurate thermometer beside the system s thermister and compare the temperatures. If temperature is not correct, use the plus or minus key to enter the correct value and then, press fan key once to save information and continue programming or press the fan key twice to save and exit programming mode. Software version and Revision numbers Turn AC unit off. While in OFF mode, enter programming mode by pressing MODE and minus key for 3 seconds. The display will flash PO during the 3 seconds. After the 3 second flash, a flashing 1 will appear on the display, which is function #1. While in program mode, the OFF LED will flash, which indicates program mode. Scroll through the function # by pressing the plus or minus key until #10 is displayed. Press the MODE key and the version # is displayed. Press fan key once to save information and continue programming or press the fan key twice to save and exit programming mode. To access the revision number, perform the same steps but scroll to function #11. LED Sleep Mode When in this mode, the LEDs and display dim in brightness 10 seconds after last key press. The first press of any button to perform an operation will bring the display and indicators to full brightness (additional presses of a button will then change a value). The display LEDs will remain at full brightness until 10 seconds have pass after the last keystroke. To access this mode: Turn AC unit off. While in OFF mode, enter programming mode by pressing MODE and minus key for 3 seconds. The display will flash PO during the 3 seconds. After the 3 second flash, a flashing 1 will appear on the display, which is function #1. While in program mode, the OFF LED will flash, which indicates program mode. Scroll through the function # by pressing the plus or minus key until #14 is displayed. Press fan key once to save information and continue programming or press the fan key twice to save and exit programming mode. Anti-Ice Routine If at any time during normal operation in the COOLING mode, the suction line sensor detects a temperature lower than 34 o F, the control will initiate the Anti-Ice Routing. The first step the controller takes is to speed up the evaporator fan. If this does not rectify the situation, then the controller will cycle the compressor. The anti-icing routine will end when the suction line temperature returns to normal, with no intervention needed from the user. Power Saver Mode Power saver mode allows the air conditioner unit to conserve power while operating on an inverter by the following actions: The setpoint lowest setting is 68 degrees F. The internal blower is set on intermittent operation. The compressor will cycle OFF for two minutes every eight minutes (even if the thermostat is calling for continuous cooling). To access this mode: Turn AC unit off. While in OFF mode, enter programming mode by pressing MODE and minus key for 3 seconds. The display will flash PO during the 3 seconds. After the 3 second flash, a flashing 1 will appear on the display, which is function #1. While in program mode, the OFF LED will flash, which indicates program mode. Scroll through the function # by pressing the plus or minus key until #15 is displayed. Press fan key once to save information and continue programming or press the fan key twice to save and exit programming mode. Fault Shutdowns and Error Messages When power is lost, the system will begin operating in previous mode prior to power loss. All program values are retained in a non-volatile memory. The SMXIII controller contains built-in safeguards designed to protect the air conditioning system from damaging conditions. If an operational failure occurs, the display will flash one of the following code messages. Fault or error code displays are cancelled by pressing the mode key. Note 1: If user selects HEAT or COOL mode, unit will operate and the display will flash an Error Code until the mode key is pressed. After the mode key is pressed, display will show constant until fault is corrected. If user selects AUTO mode, unit will shut down until mode key is pressed. Display will show and unit will run. Note 2: If an Error Code is displayed, the mode key may be pressed to continue operating unit until sensor is repaired. Fault code shutdown must be corrected before operation is allowed to continue. L-2324 Operation 13 English

14 Fault/Error Code Trouble Shooting Chart Fault Code Modes Display Comment LO then AC Low voltage shutdown See AC line voltage calibration section HI then AC High voltage shutdown See AC line voltage calibration section LO then FC HI then FC HI then PS HI then Error Code Display IS then CS then (ignore during heating mode) (steady) LO then ES ES then Low frequency shutdown High frequency shutdown High pressure shutdown (compressor running) High pressure shutdown (compressor off) Modes Internal temperature sensor error Compressor discharge temp sensor fail Mode button has been pressed to run unit after an Error Code. Evaporator Sensor Shutdown Evaporator Temp sensor In coming frequency < 57 Hz. Adjust power source output frequency to 60 Hz with unit operating in COOL mode. In coming frequency > 63 Hz. Adjust power source output frequency to 60 Hz with unit operating in COOL mode. Head Pressure above 425 PSI during cooling operation. Check to see if condenser fan is operating properly. High Pressure Switch or wiring has failed open during cooling operation. Replace high pressure switch or check high pressure switch wiring for an open circuit. Comment Replace internal Temperature sensor with cable. See note 1 below. Replace compressor discharge temperature sensor and cable. See note 1. Unit running after a sensor failure. See note 2 Shutdown due to evaporator icing in COOL mode. Evaporator sensor temperature < 34F. De-ice the evaporator by running the internal fan only in manual mode. Failed or shorted evaporator temperature sensor. Replace evaporator temperature sensor and cable. See note 1 below. L-2324 Operation 14 English

15 Quick Qt Troubleshooting Guide Problem: Display Not On Possible Solution: 1. Turn circuit breaker on 2. Check CXP cable and connections 3. Replace keypad/display 4. Replace Power/Logic board Problem: Erratic Temperature Display Possible Solution: 1. Perform a Factory Memory Reset 2. Check temperature sensor, cable and connection 3. Ensure the temperature sensor is installed properly 4. Calibrate temperature 5. Replace Power/Logic board Problem: Erratic system operation Possible Solution: 1. Perform a Factory Memory Reset 2. Check CXP cable and connections 3. Check temperature sensor, cable and connection 4. Replace keypad/display 5. Replace Power/Logic board Warning The Power/Logic board operates at 115VAC or 230VAC. Make sure the power is off before removing the cover of the Power/Logic box. Contact an authorized servicing dealer if the problem continues, or for replacement parts. Troubleshooting If display is showing a fault/error code, please refer to the Fault/Error Code Trouble Shooting Chart. Note: Internal fan (blower) is constantly on (unless in Power Saver Mode), if not check all power connections. Symptom: Unit does not operate at all. Internal fan Blower is not running. Suggested Solutions: 1. If the Qt display is not on (all LEDs and Data display window is dark), follow instructions in the Quick Qt Troubleshooting Guide above. a. Turn circuit breaker on or reset it. b. Check to ensure that the Qt display is connected to a Q-logic board (Qt display will not function with SMXII logic board. c. Check CXP or TSEP cables and connections. d. Replace CXP or TSEP cables. e. Replace keypad/display. f. Replace Q- power/logic board. 2. If the Qt display is on, check the following: a. Ensure that generator is running at the correct frequency. b. Batteries are fully charged c. Shore power (if being used) is connected properly d. Ensure the unit s circuit breaker is ON, and not tripped. e. Ensure that inverter (if equipped) is connected properly and fuse/breaker (DC and/or AC) is not tripped. Symptom: Unit does not operate. Internal fan blower is running. Suggested Solutions: 1. Check the display is not in OFF mode. 2. Check display for Fault /Error code and follow Fault/Error Code Troubleshooting Chart. 3. Check temperature setpoint to make sure it is sufficient for the unit to operate in AUTO, COOL or HEAT modes. Symptom: Unit doesn t make cold air Suggested Solutions: 1. Check the temp. setpoint to make sure it is sufficient for the unit to cool. 2. Check the evaporator air filter, clean as needed. 3. Make sure switch is set to COOL. 4. Make sure evaporator blower is running by checking for airflow from the grill. 5. Make sure that the condenser blower is running by checking for airflow under the sleeper. L-2324 Operation 15 English

16 6. Check the condenser coil while under the sleeper. If it is dirty, clean it. 7. Check the evaporator coil to make sure it is not frozen up. Sometimes, during cool outside weather, and a low fan speed, the coil may ice up. Turn the temp. setpoint so that the compressor cuts off, and turn the fan to maximum speed. Allow unit to defrost, then resume cooling. Symptom: Unit doesn t make warm air Suggested Solutions: 1. Make sure switch is set to HEAT. 2. Check the evaporator air filter, clean as needed. 3. Make sure evaporator blower is running by checking for airflow from the grill. 4. Manually lower fan speed. Air temperature should warm up. Symptom: Unit doesn t cool or heat sufficiently Suggested Solutions: 1. Change the setpoint of the thermostat as required. 2. Check evaporator air filter, clean as needed. 3. Check condenser coil, if it is dirty, then clean it. 4. Close curtains over windows and between the cab and sleeper. 5. Call a service technician. Do not attempt internal repairs yourself. System Maintenance System maintenance should be a regular program of equipment upkeep that will keep your system running well for years to come. There should be no need to change refrigerant or add refrigerant regularly unless there is a problem. If refrigerant needs to be added, consult a service technician. It is not suggested that internal repairs be tackled by anyone except trained technicians. Component Compressor Condenser Blower Evaporator Blower Heater Evaporator Filter Condenser Screen Condenser Coil Drain Tubing Necessary Action No maintenance is necessary. No maintenance is necessary. No maintenance is necessary. No maintenance is necessary. Remove, and wash with soapy water or blow out with compressed air monthly Clean debris from screen every month during the cooling season. Clean with water and soap once yearly to remove oils and debris. Check for obstructions and positioning before the cooling season. L-2324 Operation 16 English

17 Owner s Limited Warranty As hereinafter described, Dometic Environmental Corporation limits the duration of any implied warranty to the duration of the underlying express warranty and also disclaims any liability for consequential or incidental damages arising from any application, installation, use or malfunction of any warranted product. Section I What does the Limited Warranty cover? Products manufactured by Dometic Environmental Corporation (Dometic) are under limited warranty to be free from defects in workmanship or materials under normal use and service with the obligation of Dometic under this limited warranty being limited to replacing or repairing any component(s) which shall disclose defects within the time limits defined in Section III and which, upon examination by Dometic, shall appear to the satisfaction of Dometic to be defective or not up to specifications. This Limited Warranty is made in lieu of all other express warranties, obligations, or liabilities on the part of Dometic. In addition, Dometic shall not be responsible for any incidental or consequential damages. In those instances in which a cash refund is made, such refund shall effect the cancellation of the contract of sale without reservation of rights on the part of the purchaser. Such refund shall constitute full and final satisfaction of all claims which purchaser has or may have against Dometic due to any actual or alleged breach of warranty, either express or implied, including, without limitation, any implied warranty of merchantability or fitness for a particular purpose. Some states do not allow the exclusion or limitation of incidental or consequential damages so the above limitation may not apply to you. The terms and conditions of this warranty shall be governed by the laws of the Commonwealth of Virginia. The Dealer is not an agent for Dometic except for the purpose of administering the above warranty to the extent herein provided, and Dometic does not authorize the dealer or any other person to assume for Dometic any liability in connection with such warranty, or any liability or expense incurred in the replacement or repair of its products other than those expressly authorized herein. Dometic shall not be responsible for any liability or expense except as is specifically authorized and provided in this section. Dometic reserves the right to improve its products through changes in design or material without being obligated to incorporate such changes in products of prior manufacture, and to make changes at any time in design, materials, or part of units of any one year s model, without obligation or liability This warranty gives you, the purchaser, specific legal rights, and you may also have other rights which vary from state to state. You also have implied warranty rights, including an implied warranty of merchantability, which means that your product must be fit for the ordinary purposes for which such goods are used. The duration of any implied warranty rights is limited to the duration of the express warranty as found in Section III. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you. Section II What does this Limited Warranty not cover? This Warranty Shall Not Apply to: 1. Failures resulting from improper installation or use contrary to instructions. 2. Failures resulting from abuse, misuse, accident, fire, or submergence. 3. Any part manufactured by Dometic which shall have been altered so as to impair its original characteristics. 4. Any parts which fail as a result of misuse, improper application or improper installation. 5. Items not manufactured by Dometic, i.e., items which are purchased from another manufacturer and supplied as received by Dometic without alteration or modification except as any part of an Dometic-manufactured unit or component. 6. Components or parts used by or applied by the purchaser as an integral part of products not manufactured by Dometic. Installation and application of Dometic components is not warranted by Dometic because Dometic has no control or authority over the selection, location, application, or installation of these components. Section III What is the period of coverage? New unit, installed as entire system with matched components: Parts and Labor covered The standard warranty period is two (2) years from date of installation or 200,000 miles, whichever comes first. Proof of installation date and mileage is required for this warranty to be in effect. This can be the bill of sale or other official document signed by the installer as to installation date and mileage. If proof cannot be presented, then warranty period will be two (2) years from date of manufacture, as shown by the unit s serial number. Other warranty agreements between a particular customer and Dometic may supercede this statement. Replacement unit or part, with original unit still covered under warranty: Parts and Labor covered The replacement unit or part that has been replaced under warranty shall be covered for the remainder of the warranty as offered at the original sale of the unit. Replacement unit or part, with the unit not covered under warranty: Parts covered only A replacement unit or part that is replaced because of failure, and that is outside of the original warranty period shall be warranted for 90 days or 15,000 miles from date of installation. Valid proof of date of installation and mileage is required for this warranty to be valid, and must be presented at the time of claim. L English

18 Items sold by Dometic, but not manufactured by Dometic, i.e. inverters, alternators, battery separators, etc.: Parts and Labor These items will be warranted to the full period and extend of the original manufacturer s warranty to Dometic. All Dometic components bear a data plate on which there are model and serial numbers. The serial number is date coded. To determine whether or not any Dometic component is in warranty, proceed as follows: 1. Determine the manufacture date of the component from the serial number on the data plate. If you are not familiar with the date code, write or call the Dometic Customer Service Department at (800) , to obtain the manufacture date. The hours of the Customer Service Department are 8:00 am - 5:00 pm (USA, Eastern Time Zone) Monday through Friday excluding holidays. 2. It is possible that there might exist a considerable time lag between the date a component is manufactured and the date it is put in service. In such instances, the date of manufacture could indicate that the item is out of warranty. However, based on the date the equipment is first put in service, the item may still be covered by the Dometic warranty described in Section III. For proof of date put in service, Dometic will require a copy of the bill of sale of the Dometic equipment from the installer or new truck dealer to the original owner. Section IV How do you get service? Please Read the following Warranty Procedure. Warranty Procedure If the failure of a Dometic component is determined to be covered under the Dometic warranty and the time in service is determined to be within the warranty time limit, the owner has the following three options: 1. Preferred option: Have a Dometic authorized Servicing Dealer perform the work needed. The customer should call Dometic s Service Department for a recommendation as to the closest dealer. If the customer already knows an authorized servicing dealer, the dealer should be contacted directly. 2. if the customer contacts Dometic s Service Department for a Servicing Dealer and Dometic has no one in that particular area, Dometic will authorize the use of a local service company and Dometic will work with the local company to assist in any way possible. 3. The customer may send his equipment back to the factory to have the repair work done. Dometic will make every effort to return the equipment to the customer within a three week time period. If the claim represents a legitimate warranty problem, Dometic will pay the freight both ways. Dometic prefers option one and two, if at all possible. The customer may contact the Dometic Service Department at (800) Owners Limited Warranty from L-2475 (Rev ) Truck Warranty Guidelines WARNING Dometic Environmental Corporation (Dometic) manufacturers of Cruisair, Dometic Auxiliary A/C, Dometic Refrigerators and Freezers, Eskimo Ice, Grunert, Marine Air, and Sentry products, makes the following safety warnings concerning the application, installation, use and care of its products. Although these warnings are extensive, there may be specific hazards which may arise out of circumstances which we have not outlined herein. Use this as a guide for developing an awareness of potential hazards of all kinds. Such an awareness will be a key factor in assuring your SAFETY and comfort. ELECTRICITY - Many Dometic products operate on 115, 230 or 440 volt AC power. Such voltages can be LETHAL; therefore, the chassis, cabinets, bases, etc., on all components must be grounded together and connected to the vessel s grounding system. Sparks can occur as switches, thermostats and relays open and close in the normal operation of the equipment. Since this is the case, ventilating blowers for the removal of hazardous fumes or vapors should be operated at least 5 minutes before and during operation of any Dometic product or group of Dometic products. All electrical connections must be covered and protected so accidental contact cannot be made by persons using the equipment, as such contact could be LETHAL. ELECTROLYSIS - Electrical leakage of any component can cause electrolytic deterioration (electrolysis) of thru-hull components which could result in leakage serious enough to sink a vessel which could result in loss of life. All Dometic components must be kept clean and dry and checked periodically for electrical leakage. If any electrical leakage is detected, the component should be replaced or the fault causing the leakage corrected before the component is put back into service. GAS - Dometic Air Conditioning and Refrigeration components utilize R-22 (Chlorodifluoromethane), R134a refrigerant (Tetrafluoroethane), R-407C (which contains Diflouromethane [HFC-32], Pentafluoroethane [HFC125], and Tetrafluoroethane [HFC134a]), R404A (R125/R143a/R134 [44%/52%/4%]), or R417a, which are non-toxic, non-flammable gases; however, these gases contain no oxygen and will not support life. Refrigerant gas tends to settle in the lowest areas of the compartment. If you experience a leak, evacuate all personnel, and ventilate area. Do not allow open flames in the area of leaks because refrigerant gas, when burned, decomposes into other potentially LETHAL gases. Refrigerantcomponents operate at high pressure and no servicing should be attempted without gloves, long-sleeved clothing and eye protection. Liquid refrigerant gas can cause severe frost burns to the skin and eyes. VENTILATION - To cool or heat air, Dometic Air Conditioning and Refrigeration components are designed to move air through a heat exchanger by a blower or propeller fan. This design necessarily produces a suction on one side of the air handling component and a pressure on the other side. Air handling components must be installed so that the suction-pressure action does not: (1) pressurize an area to the extent that structural failure occurs which could cause harm to occupants or bystanders, or (2) cause a suction or low pressure in an area where hydrogen gas from batteries, raw fuel vapor from fuel tanks, carbon monoxide from operating propulsion engines, power generators or heaters, methane gas from sewage holding tanks, or any other dangerous gas or vapor could exist. If an air handling unit is installed in such a manner that allows potentially lethal gases or vapors to be discharged by the air handling unit into the living space, this could result in loss of life. Maximum protection against the introduction of dangerous gases or vapors into living spaces can be obtained by providing living spaces which are sealed from all other spaces by use of airtight bulkheads and decks, etc., and through the introduction of clean air into the living space. Bear in mind that the advent of air conditioning, whether it be for cooling or for heating, naturally leads to the practiceof closing a living space tightly. Never close all windows and doors unless auxiliary ventilating systems, which introduce clean outside air into the living space, are used. Always leave enough window and door openings to provide adequate ventilation in the event potentially lethal gases or fumes should escape from any source. CONDENSATE - All cooling units produce water condensate when operating on the cooling cycle. This water must be drained from the cooling unit overboard. If condensate is allowed to drip on a wooden structure, rotting or decay and structural failure may occur which could result in loss of life. If condensate is allowed to drip on electrical components, deterioration of the electrical components could result in hazardous conditions. When an air conditioning system is in operation, condensate drains may be subjected to negative pressure. Alwayslocate condensate drains as far as possible from points where engine waste and other dangerous gases are exhausted so no such dangerous gases can be drawn into the condensate drains. Warning Never sleep in a closed area on a boat when any equipment, which functions as a result of the combustion of a volatile fuel, is in operation (such as engines, generators, power plants, or oil-fired heaters, etc.). At any time, the exhaust system of such devices could fail, resulting in a build-up of LETHAL gases within the closed area. Warning Revised: L English

19 Description of Figures Fig. 1 CHEB Mounting Clips Fig. 2 Snap-In Liquid-Tight Grommets Fig. 3 Mounting of CF Unit Fig. 4 Mounting of CF Unit Fig. 5 Refrigerant Line Connections Fig. 6 Grille Location Fig. 7 Wiring Diagram # L English

20 Fig.1 - Location of CHEB Unit Fig. 2 - Snap-In Liquid Tight Grommets Outside of Cab Cab Floor Inside of Cab Snap Into Panel Cut as shown and Insert Cable Pull Back Cable to Form Seal L