Electronic Board. Application Manual

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1 Electronic Board 2010 Acson International Application Manual

2 Table Of Contents Direct Expansion System Single Split Single Compressor (L2.2) Single Split Single Compressor (L208) Single Split Single Compressor (SB125) Single Split Multi Compressor (SQ2.0) Chilled Water System Fan Coil Unit (W2.0) Water Source Heatpump (LWS2.0) Mini Chiller Multi Compressor (MC1.1) Handset G12 G18 Sequential LCD Netware 3 SLM 3 Chiller Panel Appendix Controllers Development PCB Identification Thermistor Appendix1... Appendix1... Appendix1

3 Single Split Single Compressor (L2.2) 1 Introduction 1.1 Features of Entity AUTO/ COOL/ DRY/ FAN/ HEAT/ DEFROST system control. AUTO/ HIGH/ MED/ LOW indoor fan speed control. Single speed outdoor fan control. Louver and AC swing control option. Real time clock Real time ON/OFF timer. SLEEP function for COOL, HEAT and AUTO mode. Cold start, Hot start and Hot keep. Memory backup (non-volatile) for last state settings option. LEDs display for CDF, COOL, DRY, FAN, HEAT, SLEEP, TIMER, ION only On line testing activation (OnTAC) IR reception Multi-split (MSP) model option Wired and wireless control Water pump control IONIZER control TURBO function Heat Mode Offset 2 C option 1.2 Protections Self diagnostics. Indoor antifreeze for cooling cycle. Compressor recycle protection (Anti short cycle timer). Compressor random restart during 1st thermostat cut in cycle. Gas leak detection option. Compressor overload manual/auto reset option. Compressor HARDWARE overloads protection option. 2 Functions 2.1 Models The system modes are: Models Modes AP Auto > Cool > Dry > Fan > Heat > EC Cool > Dry > Fan > 2.2 Power Up Settings During power up, the system can be configured to memorize the settings prior to power down. This is done by shorting the 2 way straight header J_LST. The settings that are memorized are:- 2

4 a) Mode & On/Off status b) Set Temperature c) Fan Speed d) DC swing e) AC swing f) Key Lock (for wired control) These data or settings are save in non-volatile memory. The CPU will save the updated settings into the memory 10 seconds after changes are confirmed. However, it will take 3 seconds to update the memory if the unit changes from on to off state. If the J_LST is not shorted or memory corrupted, the default settings are a) Unit : OFF, b) Mode : COOL, c) Set Temp. : 24 C, d) Indoor fan speed: HIGH e) SWING OFF 2.3 Unit ON/OFF There are 3 ways to turn on or off the system: i) via ON/OFF triggering ii) via real-time ON/OFF timer ON/OFF triggering ON/OFF triggering can be achieved by pressing the emergency ON/OFF button or the LCD remote controller ON/OFF button. In doing so, the DELAY timer will be reset. When the emergency ON/OFF button is pressed, the system mode setting will rotate in the following sequence:- MODEL SEQUENCE AP > COOL > HEAT > OFF > EC >COOL > OFF > The corresponding LEDs will also follow suit. Pressing the wired/wireless controller ON/OFF button will toggle the system status either from ON to OFF or from OFF to ON Real Time ON/OFF timer When the real time ON timer set time matches the internal real time clock, the unit will be switched on. Similarly, when the OFF time matches the real time clock, the unit is switched off. The timer settings are retained so that similar switching can occur 24 hours later. These timers will be deactivated if the emergency ON/OFF switch is pressed. 2.4 Temperature Range and Settings The operating temperature range is 16 C to 30 C (60 F to 86 F), both inclusive. Temperature setting is allowed in COOL, DRY, HEAT and AUTO modes. 3

5 2.5 Sleep Function This function will increase or decrease the set temperature with time. The COOL and HEAT mode SLEEP profile is as follows: Mode Cool Algorithm Heat The SLEEP function is only available for COOL, HEAT and AUTO modes. Changing to other modes will inhibit the SLEEP function and the timer will be reset. Pressing the emergency ON/OFF will deactivate and clear the sleep function. This function is set/reset by the wired/wireless controller. 2.6 Indoor Fan Control The indoor fan speeds are LO, MED, HIGH or AUTO FAN in COOL, HEAT and AUTO modes. In FAN mode, only HI, MED and LO speeds are allowed. 2.7 Louver and Swing Control The swing will run if indoor fan is on and vice versa. If unit switches from off mode to on mode, the louver will stop at the last position when it goes from on to off mode. 4

6 2.8 IONIZER Control The IONIZER will be turned ON when indoor fan is running and it will be turned OFF when indoor fan stop. This function is set/reset by the wireless controller. 2.9 TURBO Function TURBO function is available in COOL, HEAT and DRY modes only. The indoor fan will force to high fan. After 20 minutes, this function will clear automatically, indoor fan speed will restore. Cold start will be overridden when TURBO function is activated. If TURBO and SLEEP are activated at the same time, the SLEEP mode timer will be reset, it will resume after TURBO function is cleared. Compressor cut out will deactivate TURBO function Heat Mode Offset 2 C Option If D OT is open, the HEAT mode set temperature will be added by 2 C. This option is not applicable in AUTO HEAT mode. 3 Operating Modes The system mode is set by the wired/wireless control. The actual mode will be shown on the mode LEDs. Mode changes respond 2 seconds after data reception. 3.1 Cold Start When the unit restarts 2 hours after it has stopped or during power-on-reset start, it is considered a cold start. This feature is not available in sleep mode. 3.2 Cool Mode In Cool mode, the compressor will be cut in if the Tr - Ts > 0.5 C and the compressor will be cut out if the Tr < Ts C, subject to timing protections. In this mode, the indoor fan is always running. For manual speed, the indoor fan will run as per user set speed. In AUTO FAN speed, the indoor fan speed will run as follows: 5

7 C Ts H M L M H COMP ON M L L M H COMP OFF COMP ON 3.3 Dry Mode During the first 12 minutes of the DRY mode run from: i) Cold Start or ii) Mode change from HEAT, FAN or AUTO HEAT Dry mode must run under cool mode with AUTO indoor fan for 12 minutes or until Tr < Ts - 1 C. After this, the dry mode may run under either Zone A, B, C or D as below: i) if Tr - Ts > 2 C, the operation is in Zone A ii) if 1 C < Ts - Tr < 2 C, then the operation is in Zone C. iii) if 0 C < Tr - Ts < 1 C, then the operation is in Zone B. iv) if Ts - Tr > 3 C, then the operation is in Zone D. v) the other temperature ranges are dead bands for zone stability. 6

8 The sequence for the various zones is as shown: Condition Zone Algorithm i) if Tr - Ts > 2 C A ii) if 0 C < Tr - Ts < 1 C B iii) if 1 C < Ts - Tr < 2 C C iv) if Ts Tr > 3 C D v) the other temperature ranges are dead bands for zone stability Fan Mode Only HI, MED and LO speeds are allowed. The compressor and the outdoor fan will stop. Similarly, the 4-way valve will turn off. 7

9 3.5 Heat Mode There is a model of heat mode, namely auto heatpump (AP) Heat Pump Model The compressor will be cut in if the Tr < Ts+1 and it will be cut out if Tr - Ts > 3.5 C, subject to timing protections. If D OT is open, the HEAT mode set temperature will be added by 2 C. For manual speed, the indoor fan will run as per user set speed. In AUTO FAN speed, the indoor fan speed will run as follows: C Ts COMP OFF M H M L M H M L COMP ON COMP OFF These fan speeds are subjected to the following Hot start and Hot keep features: Hot Start During the cut in cycle, the indoor fan speed will modulate according to the indoor coil temperature: i) if the indoor coil temperature > 40 C, the indoor fan will run at user set fan speed. ii) if the indoor coil temperature < 18 C, the indoor fan speed will stop. For fan always ON option, then indoor fan will run low. iii) if the indoor coil temperature crosses the 30 C mark, the indoor fan speed will be changed to low. (either start from off, or change from higher speed) Hot Keep When the compressor cuts out, the unit is in hot keep mode. There are 3 options of Hot Keep: 8

10 Fan on option This option is selected if a 22k ohm resistor is inserted into RFAN. The start of heat mode, is defined as when: a) the unit is just turned on from off with setting in Heat mode OR b) the mode changes from non-heat to Heat mode OR c) just after the end of a defrost cycle, The hot keep cycle at the start of heat mode will be as follow: i) if the indoor coil temperature > 40 C, the indoor fan will run at set speed. i) if the indoor coil temperature crosses 37 C, the indoor fan will run low. ii) if indoor coil temperature < 30 C, the indoor fan will stop. For thermostat cycle cut offs, the following hot keep cycle will apply: i) if the indoor coil temperature > 40 C, the indoor fan will run at set speed. ii) if the indoor coil temperature crosses 37 C, the indoor fan will run at low speed. iii) if indoor coil temperature < 18 C, the indoor fan will stop. Fan off option This option is selected if a 7k5 ohm resistor is inserted into RFAN. i) if the indoor coil temperature > 40 C, the indoor fan will run at set speed. ii) if the indoor coil temperature crosses 37 C, the indoor fan will run at low speed. iii) if indoor coil temperature < 30 C, the indoor fan will stop. Fan low cycle on & off option This option is selected if a 3k ohm resistor is inserted into RFAN. The low fan will cut in for 30 seconds and subsequently off for 120 seconds. These cycle of on and off will repeat way valve switching To run heat pump, the 4-way valve must turn ON. Upon return to a non-heat pump mode, the 4-way must turn OFF. The 4-way valve can only be changed 55+/- 5 seconds after the compressor has been cut out. Then the compressor may be cut in 4 seconds later. 3.6 Auto Mode Under AUTO mode, the mode can be selected automatically between Heat and Cool mode, depending on the room temperature and Set Temperature. There is no cold start in Auto mode. If the present Auto mode is Cool, its mode Set Temperature is the same as the user Set Temperature. This mode will only change to Heat mode if :- i) Tr <= Ts mode C AND ii) the compressor has cut out for at least 10 minutes. If the present Auto mode is heat, its mode set temperature is 1.5 C below the user Set Temperature. This mode will only change to Cool mode if:- i) Tr > Ts mode C AND ii) the compressor has cut out for at least 10 minutes. 9

11 Cool and Heat options working under Auto mode are the same as those working under non-auto mode. 3.7 Defrost Mode A defrost timer will start counting when the outdoor heat exchange thermistor is below +3 C. Upon crossing over +5 C to a higher temperature for more than 150 seconds, the timer will be reset. The temperature sensing could only be done when the compressor run time is more than 2 minutes. The likelihood of ice frosting at the outdoor coil is characterized by 3 gradients of outdoor temperature shown in the chart below: C To C ' 1 hr 2 hrs time -2 B -4-6 A -8 defrost mode if more than 3 minutes Defrost mode will be activated if the compressor run time is: i) 30 mins to 1 hour below 3 C reference point, if the outdoor coil temperature is <=-8 C for more than 3 minutes (provided the compressor is on), then the defrost mode can be started. ii) 1 hour to 2 hours below +3 C reference point, if the outdoor coil temperature is <=-4 C for more than 3 minutes (provided the compressor is on), then the defrost mode can be started. iii) more than 2 hours below +3 C reference point, if the outdoor coil temperature is <=-2 C for more than 3 minutes (provided the compressor is on), then the defrost mode can be started. If unit in outdoor fan forced off mode, the defrost will not be allowed to be declared Defrost cycle In the defrost cycle, the HEAT LED will blink only in SLM3. 10

12 When defrost starts, the indoor fan, auxiliary heater, outdoor fan & 4-way valve will cut off while the compressor remains running. The defrost will terminate if:- a) Temperature of outdoor exchange coil exceeds +10 C or b) A minimum of 10 minutes compressor run time is achieved. At the end of the defrost cycle, the compressor cuts out. The 4-way valve switches on 15 +/- 5 seconds later. The compressor can cut in 20 seconds after the 4-way valve has cut in. 3.8 Off mode When the unit is off, no indication will be provided. All relays will be turned off immediately after the ON/OFF triggering except the 4-way valve which is subjected to the 55 +/- 5 seconds protection where applicable. 4 Protections 4.1 Thermostat Minimum OFF Time. For thermostat cycles, the compressor can only cut in after a minimum period of 3 minutes from the time it cuts off except during valve changeover sequences. 4.2 Compressor Random Restart Should the main power cuts out and power resume, there are 2 options whereby will depend on if memory backup option is selected:- a) If memory backup option is not selected. Compressor can cut in immediately after power up again; subject to thermostat cut in mode. b) If memory backup option is selected. Compressor can cut in 0 64 seconds after power up again; subject to. thermostat cut in mode. 4.3 Thermostat Minimum Run Time For thermostat cycles, the compressor can only cut out after minimum 150 seconds of running in the current mode. The compressor can be cut out at any time if the system is switched to other modes or in any other protection sequences. 4.4 Compressor Overload Protection There are two methods to detect the compressor overload; namely by the coil sensors and the hardware overload (normally close) switch. 4.5 Coil Sensors Detection This protection is only available in COOL, DRY, HEAT and AUTO modes. 11

13 In cooling cycle, when the Outdoor Coil temperature exceeds 68 C, both the compressor and outdoor fan will stop operating. In heating cycle, when the Indoor Coil temperature exceeds 68 C, the compressor, outdoor fan and 4WV will stop operating accordingly. The indoor fan will continue operating as per hot keep. The unit will auto reset if the temperature goes below 50 C. This is allowed once every power on reset. If the unit is required to auto reset every time the overload occurs, please refer to the RGL hardware selection. If the temperature goes below the permissible limit, the overload protection can be reset manually by triggering the ON/OFF. 4.6 Hardware Switch Detection This is a normally close switch. It is connected in series with the power supply to the controller. Once there is overload, the switch will open and power supply to controller will be cut off. During the first cycle of thermostat on since power on reset, a counter is increased by one and a timer starts to run. If the timer exceeds 3 minutes or the unit is turned off, the counter is reset to 0. During the increment, if the counter is > 5, the unit will declare compressor overload protection. This fault is manual resettable. The counter is saved in the non-volatile memory. If memory backup option is not selected, the counter is always set to 0 during power on reset. It is selectable thru RGL. 4.7 Outdoor fan speed control Heating Cycle The outdoor fan will cut off when the indoor coil temperature exceeds 55 C / 53ºC (Depends on outdoor/indoor fan speed control option). The outdoor fan may resume when indoor coil temperature is lower than 50 C. The indoor fan speed will be forced to 1 speed higher than the user set speed when the indoor coil temperature exceeds 53 C / 51ºC; i.e. LOW fan will be forced to MEDIUM fan while MEDIUM fan will be forced to HIGH fan and there is no change if the user set speed is HIGH. It will resume at the user set speed when indoor coil temperature is lower than 48 C. Cooling Cycle The outdoor fan will run whenever the compressor is cut in. 4.8 Indoor Anti freeze This protection is only available in cooling cycle. The system will be in the Frost Prevention Mode if the Indoor Coil Temp. reaches 1 C / 3ºC (depends on antifreeze option) and below for at least 1 minute AND compressor has been running for at least 10 minutes. Upon confirmation, the compressor and the outdoor fan must be stopped. The compressor and the outdoor fan can only be restarted when the Indoor Coil temperature reaches 10 C and above for at least 1 minute. 12

14 4.9 Self Diagnostics Event CDF LED Timer LED Other LEDs Error Code 1 Room sensor open or short Blink 1 time - - Blink E1 2 Indoor coil sensor open Blink 2 time - Blink Sleep Blink E2 3 Outdoor coil sensor open Blink 3 time - - Blink E3 4 Compressor overload/ Indoor coil sensor short/ outdoor coil sensor short Blink 1 time - Blink E4 5 Gas leak Blink 3 times - Blink E5 6 Water pump fault Blink 2 times - Blink E6 7 Outdoor coil sensor exist (MS model) Blink 5 times Blink Heat Blink E7 8 Hardware error (tact switch pin short) Blink 6 times Blink Heat Blink E8 * Remark: SLM will blink the HEAT led when defrost happened. The unit will not detect sensor missing when the compressor is ON 4.10 Gas Leak (Outdoor unit abnormal) This option is selected via resistor RGL. The gas leak is declared if indoor coil temperature is > 25 C in cooling cycle or < 20 C in heating cycle. The system will check the gas leak mode if compressors run time of 30 minutes is achieved. If above condition is met, the system will reconfirm the indoor coil temperature for another 5 minutes before declaring the gas leak mode. No gas leak checking during outdoor defrost. The compressor run timer will be reset. 5 OnTAC Activation This feature is to force the compressor on for approximately 10 minutes irrespective of room temperature and compressor minimum off time protection. Besides the compressor minimum off time, other protections are still available. This feature is allowed to be activated once every power on reset and is activated by pressing the emergency on/off button for more than 5 seconds. To activate OnTac in cooling cycle, ensure the unit to off mode first. Then press the button for more than 5 seconds. To activate the OnTac in heating cycle, set the unit to cool mode first before pressing the button for more than 5 seconds. 6 Hardware Selections There are 2 resistors (Rxxx) used in the board to configure various board operations:- 6.1 RFAN For AP model, this is used to configure board s HOT KEEP specifications:- OPEN - Multisplit (always use YA spec) 22k - C2 spec (Fan on, off below 18ºC). 13

15 7k5 - YA spec (Fan off). 6.2 RGL This is used to enable or disable the Gas Leak and Compressor overload options:- 110k - Gas leak on, Compressor overload manual reset, hardware overload detection off 22k - Gas leak on, Compressor overload auto reset, hardware overload detection on 7k5 - No gas leak, Compressor overload manual reset, hardware overload detection off 3k - No gas leak, Compressor overload auto reset, hardware overload detection on There are 3 diodes used in the board to configure various board operations:- 6.3 Offset temperature. (D OT ) This diode used to select set temperature offset option in heat mode. Exist - No offset Open - 2ºC is added to set temperature in heat mode. 6.4 Antifreeze 1ºC / 3ºC option (D 1/3C ) This diode is used to select 1ºC / 3ºC threshold for cool mode antifreeze protection. Exist - 1ºC Open - 3ºC 6.5 Outdoor/Indoor fan speed control option (D 55/53C ) This diode is used to select 55ºC/53ºC threshold for heating mode outdoor fan and indoor fan speed control. Exist - 55ºC outdoor fan off. 53ºC indoor fan forced higher speed. Open - 53ºC outdoor fan off. 51ºC indoor fan forced higher speed. 7 Multi Spit Model Most of the control algorithms for multi split model is similar to single split unless stated below: 7.1 There is no outdoor coil sensor for multi split model. If outdoor coil sensor is inserted, unit will show error. 7.2 Since the outdoor sensor is not available, the overload protection only limited to heating cycle by checking the indoor coil sensor. 7.3 No outdoor defrost cycle (Taken care by outdoor controller). 14

16 7.4 There is no gas leak detection. 7.5 Multi split Hot Start i) if the indoor coil temperature > 40 C, the indoor fan will run at user set fan speed. ii) if the indoor coil temperature < 25 C, the indoor fan speed will stop. For fan always ON option, then indoor fan will run low. iii) if the indoor coil temperature crosses the 30 C mark, the indoor fan speed will be changed to low. 7.6 Multi split Hot Keep Only one hot keep option which is fan off option: i) if the indoor coil temperature > 40 C, the indoor fan will run at set speed. ii) if the indoor coil temperature crosses 37 C, the indoor fan will run at low speed. iii) if indoor coil temperature < 30 C, the indoor fan will stop. 15

17 8 Schematic Diagram Figure 1: Figure 2: 16

18 Single Split - Single Compressor (L208) 1 Introduction 1.1 Features of Entity AUTO/ COOL/ DRY/ FAN/ HEAT/ DEFROST system control. AUTO/ HIGH/ MED/ LOW indoor fan speed control. Single speed outdoor fan control. Louver and AC swing control option. Real time clock Real time ON/OFF timer. SLEEP function for COOL, HEAT and AUTO mode. Cold start, Hot start and Hot keep. Memory backup (non-volatile) for last state settings option. LEDs display for POWER, COOL, DRY, FAN, HEAT, SLEEP, TIMER, ION only On line testing activation (OnTAC) IR reception Multi-split (MSP) model option Wired and wireless control Water pump control IONIZER control TURBO function Heat Mode Offset 2 C option 1.2 Protections Self diagnostics. Indoor antifreeze for cooling cycle. Compressors recycle protection (Anti short cycle timer). Compressor random restart during 1st thermostat cut in cycle. Gas leak detection option. Compressor overload manual/auto reset option. Compressor HARDWARE overloads protection option. 17

19 2 Functions 2.1 Models The system has 2 modes which are cooling only mode (EC) and heatpump mode (AP). Models Modes AP Auto > Cool > Dry > Fan > Heat > EC Cool > Dry > Fan > 2.2 Power Up Settings During power up, the system can be configured to memorize the settings prior to power down. This is done by shorting the 2 way straight header J_LST. The settings that are memorized are:- a) Mode & On/Off status b) Set Temperature c) Fan Speed d) DC swing e) AC swing f) Key Lock (for wired control) These data or settings are saving in non-volatile memory. The system will save the updated settings into the memory 10 seconds after changes are confirmed. However, it will take 3 seconds to update the memory if the unit changes from on to off state. If the J_LST is not shorted or memory corrupted, the default settings are a) Unit : OFF, b) Mode : COOL, c) Set Temp. : 24 C, d) Indoor fan speed: HIGH e) SWING OFF 2.3 Unit ON/OFF There are 2 ways to turn on or off the system: i) via ON/OFF triggering ii) via real-time ON/OFF timer ON/OFF triggering ON/OFF triggering can be achieved by pressing the emergency ON/OFF button or the LCD remote controller ON/OFF button. When the emergency ON/OFF button is pressed, the system mode setting will rotate in the following sequence:- MODEL SEQUENCE AP > COOL > HEAT > OFF > EC >COOL > OFF > The corresponding LEDs will also follow suit. Pressing the wired/wireless controller ON/OFF button will toggle the system status either from ON to OFF or from OFF to ON. 18

20 2.3.2 Real Time ON/OFF timer When the real time ON timer set time matches the internal real time clock, the unit will be switched on. Similarly, when the OFF time matches the real time clock, the unit is switched off. The timer settings are retained so that similar switching can occur 24 hours later. These timers will be deactivated if the emergency ON/OFF switch is pressed. 2.4 Temperature Range and Settings The operating temperature range is 16 C to 30 C (60 F to 86 F), both inclusive. Temperature setting is allowed in COOL, DRY, HEAT and AUTO modes. 2.5 Sleep Function This function will increase or decrease the set temperature with time. The COOL and HEAT mode SLEEP profile is as follows: Mode Cool Algorithm Heat The SLEEP function is only available for COOL, HEAT and AUTO modes. Changing to other modes will inhibit the SLEEP function and the timer will be reset. Pressing the emergency ON/OFF will deactivate and clear the sleep function. This function is set/reset by the wired/wireless controller. 19

21 2.6 Indoor Fan Control The indoor fan speeds are LO, MED, HIGH or AUTO FAN in COOL, HEAT and AUTO modes. In FAN mode, only HI, MED and LO speeds are allowed. 2.7 Louver and Swing Control The swing will run if indoor fan is on and vice versa. If unit switches from off mode to on mode, the louver will stop at the last position when it goes from on to off mode. 2.8 Water Pump Control The water pump will on if compressor is on during cooling cycle. The pump will remain on for at least 5 after the comp is off. During mode change from cooling to non cooling mode, the pump will on for minimum 5. During defrost cycle, the pump will on and will on for another 5 once the defrost cycle is terminated. 2.9 Water Level Switch Detection This normally close switch is to detect faults in water pump system. It will confirm for 30 for switch open and 60 for switch close. Once switch is confirmed open, it will force compressor to cut off. The compressor is not allowed to cut in. Error will be declared IONIZER Control The IONIZER will be turned ON when indoor fan is running and it will be turned OFF when indoor fan stop. This function is set/reset by the wireless controller TURBO Function TURBO function is available in COOL, HEAT and DRY modes only. The indoor fan will force to high fan. After 20 minutes, this function will clear automatically, and the indoor fan speed will restore. Cold start will be overridden when TURBO function is activated. If TURBO and SLEEP are activated at the same time, the SLEEP mode timer will be reset, it will resume after TURBO function is cleared. Compressor cut out will deactivate TURBO function Heat Mode Offset 2 C Option If D OT is open, the HEAT mode set temperature will be added by 2 C. This option is not applicable in AUTO HEAT mode. 20

22 3 Operating Mode The system mode is set by the wired/wireless control. The actual mode will be shown on the mode LEDs. Mode changes respond 2 seconds after data reception. 3.1 Cold Start When the unit restarts 2 hours after it has stopped or during power-on-reset start, it is considered a cold start. This feature is not available in sleep mode. 3.2 Cool Mode In Cool mode, the compressor will be cut in if the Tr - Ts > 0.5 C and the compressor will be cut out if the Tr < Ts C, subject to timing protections. In this mode, the indoor fan is always running. For manual speed, the indoor fan will run as per user set speed. In AUTO FAN speed, the indoor fan speed will run as follows: C Ts H M L M H COMP ON M L L M H COMP OFF COMP ON 3.3 Dry Mode During the first 12 minutes of the DRY mode run from: i) Cold Start or ii) Mode change from HEAT, FAN or AUTO HEAT Dry mode must run under cool mode with AUTO indoor fan for 12 minutes or until Tr < Ts - 1 C. After this, the dry mode may run under either Zone A, B, C or D as below: 21

23 i) if Tr - Ts > 2 C, the operation is in Zone A ii) if 1 C < Ts - Tr < 2 C, then the operation is in Zone C. iii) if 0 C < Tr - Ts < 1 C, then the operation is in Zone B. iv) if Ts - Tr > 3 C, then the operation is in Zone D. v) the other temperature ranges are dead bands for zone stability. The sequence for the various zones is as shown: Condition Zone Algorithm i) if Tr - Ts > 2 C A ii) if 0 C < Tr - Ts < 1 C B iii) if 1 C < Ts - Tr < 2 C C iv) if Ts Tr > 3 C D v) the other temperature ranges are dead bands for zone stability

24 3.4 Fan Mode Only HI, MED and LO speeds are allowed. The compressor and the outdoor fan will stop. Similarly, the 4-way valve will turn off. 3.5 Heat Mode There is a model of heat mode, namely auto heatpump (AP) Heat Pump Model The compressor will be cut in if the Tr < Ts+1 and it will be cut out if Tr - Ts > 3.5 C, subject to timing protections. For manual speed, the indoor fan will run as per user set speed. In AUTO FAN speed, the indoor fan speed will run as follows: C Ts COMP OFF M H M L M H M L COMP ON COMP OFF These fan speeds are subjected to the following Hot start and Hot keep features: Hot Start During the cut in cycle, the indoor fan speed will modulate according to the indoor coil temperature: i) if the indoor coil temperature > 40 C, the indoor fan will run at user set fan speed. ii) if the indoor coil temperature < 18 C, the indoor fan speed will stop. For fan always ON option, indoor fan will run low. iii) if the indoor coil temperature crosses the 30 C mark, the indoor fan speed will be changed to low. (either start from off, or change from higher speed) 23

25 Hot Keep When the compressor cuts out, the unit is in hot keep mode. There are 4 options of Hot Keep: Fan Always on option For thermostat cycle cut offs, the following hot keep cycle will apply: i) if the indoor coil temperature > 40 C, the indoor fan will run at set speed. ii) if the indoor coil temperature crosses below 37 C, the indoor fan will run at low speed. Fan on option The start of heat mode, is defined as when: a) the unit is just turned on from off with setting in Heat mode OR b) the mode changes from non-heat to Heat mode OR c) just after the end of a defrost cycle, The hot keep cycle at the start of heat mode will be as follow : i) if the indoor coil temperature > 40 C, the indoor fan will run at set speed. i) if the indoor coil temperature crosses 37 C, the indoor fan will run low. ii) if indoor coil temperature < 30 C, the indoor fan will stop. For thermostat cycle cut offs, the following hot keep cycle will apply: i) if the indoor coil temperature > 40 C, the indoor fan will run at set speed. ii) if the indoor coil temperature crosses 37 C, the indoor fan will run at low speed. iii) if indoor coil temperature < 18 C, the indoor fan will stop. Fan off option i) if the indoor coil temperature > 40 C, the indoor fan will run at set speed. ii) if the indoor coil temperature crosses 37 C, the indoor fan will run at low speed. iii) if indoor coil temperature < 30 C, the indoor fan will stop. Fan low cycle on & off option The low fan will cut in for 30 seconds and subsequently off for 120 seconds. These cycles of on and off will repeat way valve switching To run heat pump, the 4-way valve must turn ON. Upon return to a non-heat pump mode, the 4-way must turn OFF. The 4-way valve can only be changed 55+/- 5 seconds after the compressor has been cut out. Then the compressor may be cut in 4 seconds later. 3.6 Auto Mode Under AUTO mode, the mode can be selected automatically between Heat and Cool mode, depending on the room temperature and Set Temperature. There is no cold start in Auto mode. If the present Auto mode is Cool, its mode Set Temperature is the same as the user Set Temperature. This mode will only change to Heat mode if:- i) Tr <= Ts mode C AND ii) the compressor has cut out for at least 10 minutes. 24

26 If the present Auto mode is heat, its mode set temperature is 1.5 C below the user Set Temperature. This mode will only change to Cool mode if:- i) Tr > Ts mode C AND ii) the compressor has cut out for at least 10 minutes. Cool and Heat options working under Auto mode are the same as those working under non-auto mode. 3.7 Defrost Mode A defrost timer will start counting when the outdoor heat exchange thermistor is below +3 C. Upon crossing over +5 C to a higher temperature for more than 150 seconds, the timer will be reset. The temperature sensing could only be done when the compressor run time is more than 2 minutes. The likelihood of ice frosting at the outdoor coil is characterized by 3 gradients of outdoor temperature shown in the chart below: C To C ' 1 hr 2 hrs time -2 B -4-6 A -8 defrost mode if more than 3 minutes Defrost mode will be activated if the compressor run time is: i) 30 mins to 1 hour below 3 C reference point, if the outdoor coil temperature is <=-8 C for more than 3 minutes (provided the compressor is on), then the defrost mode can be started. ii) 1 hour to 2 hours below +3 C reference point, if the outdoor coil temperature is <=-4 C for more than 3 minutes (provided the compressor is on), then the defrost mode can be started. 25

27 iii) more than 2 hours below +3 C reference point, if the outdoor coil temperature is <=-2 C for more than 3 minutes (provided the compressor is on), then the defrost mode can be started. If unit in outdoor fan forced off mode, the defrost will not be allowed to be declared Defrost cycle In the defrost cycle, the HEAT LED will blink only in SLM3. When defrost starts, the indoor fan, auxiliary heater, outdoor fan & 4-way valve will cut off while the compressor remains running. The defrost will terminate if:- a) Temperature of outdoor exchange coil exceeds +10 C or b) A minimum of 10 minutes compressor run time is achieved. At the end of the defrost cycle, the compressor cuts out. The 4-way valve switches on 15 +/- 5 seconds later. The compressor can cut in 20 seconds after the 4-way valve has cut in. 3.8 Off mode When the unit is off, no indication will be provided. All relays will be turned off immediately after the ON/OFF triggering except the 4-way valve which is subjected to the 55 +/- 5 seconds protection where applicable. 4 Protections 4.1 Thermostat Minimum OFF Time. For thermostat cycles, the compressor can only cut in after a minimum period of 3 minutes from the time it cuts off except during valve changeover sequences. 4.2 Compressor Random Restart Should the main power cuts out and power resume, there are 2 options whereby will depend on if memory backup option is selected:- a) If memory backup option is not selected. Compressor can cut in immediately after power up again; subject to thermostat cut in mode. b) If memory backup option is selected. Compressor can cut in 0 64 seconds after power up again; subject to. Thermostat cut in mode. 4.3 Thermostat Minimum Run Time For thermostat cycles, the compressor can only cut out after minimum 150 seconds of running in the current mode. The compressor can be cut out at any time if the system is switched to other modes or in any other protection sequences. 26

28 4.4 Compressor Overload Protection There are two methods to detect the compressor overload; namely by the coil sensors and the hardware overload (normally close) switch. 4.5 Coil Sensors Detection This protection is only available in COOL, DRY, HEAT and AUTO modes. In cooling cycle, when the Outdoor Coil temperature exceeds 68 C, both the compressor and outdoor fan will stop operating. In heating cycle, when the Indoor Coil temperature exceeds 68 C, the compressor, outdoor fan and 4WV will stop operating accordingly. The indoor fan will continue operating as per hot keep. The unit will auto reset if the temperature goes below 50 C. This is allowed once every power on reset. If the unit is required to auto reset every time the overload occurs, please refer to the RGL hardware selection. If the temperature goes below the permissible limit, the overload protection can be reset manually by triggering the ON/OFF. 4.6 Hardware Switch Detection This is a normally close switch. It is connected in series with the power supply to the controller. Once there is overload, the switch will open and power supply to controller will be cut off. During the first cycle of thermostat on since power on reset, a counter is increased by one and a timer starts to run. If the timer exceeds 3 minutes or the unit is turned off, the counter is reset to 0. During the increment, if the counter is > 5, the unit will declare compressor overload protection. This fault is manual resettable. The counter is saved in the non-volatile memory. If memory backup option is not selected, the counter is always set to 0 during power on reset. It is selectable thru RGL. 4.7 Outdoor fan speed control Heating Cycle The outdoor fan will cut off when the indoor coil temperature exceeds 55 C / 53ºC (Depends on outdoor/indoor fan speed control option). The outdoor fan may resume when indoor coil temperature is lower than 50 C. The indoor fan speed will be forced to 1 speed higher than the user set speed when the indoor coil temperature exceeds 53 C / 51ºC; i.e. LOW fan will be forced to medium fan while medium fan will be forced to HIGH fan and there is no change if the user set speed is HIGH. It will resume at the user set speed when indoor coil temperature is lower than 48 C. Cooling Cycle The outdoor fan will run whenever the compressor is cut in. 27

29 4.8 Indoor Anti freeze This protection is only available in cooling cycle. The system will be in the Frost Prevention Mode if the Indoor Coil Temp. reaches 1 C / 3ºC (depends on antifreeze option) and below for at least 1 minute AND compressor has been running for at least 10 minutes. Upon confirmation, the compressor and the outdoor fan must be stopped. The compressor and the outdoor fan can only be restarted when the Indoor Coil temperature reaches 10 C and above for at least 1 minute. 4.9 Self Diagnostics Event PWR LED Timer LED Other LEDs Error Code Room sensor open or 1 short Blink 1 time - Blink Fan Blink E1 Indoor coil sensor 2 open Blink 2 time - Blink Dry & Fan Blink E2 Outdoor coil sensor 3 open Blink 3 time - Blink Dry Blink E3 Compressor overload/ Indoor coil sensor short/ outdoor coil 4 sensor short Blink 1 time Blink Cool Blink E4 5 Gas leak Blink 3 times Blink Cool & Dry Blink E5 6 Water pump fault Blink 2 times Blink Cool & Fan Blink E6 No indication in display panel. 7 Outdoor defrost - (Blink HEAT in SLM3.) Outdoor coil sensor exist (MS model) Hardware error (tact switch pin short) Blink 5 times EC Blink COOL & SLEEP & HEAT/SLEE P AP Blink COOL & HEAT & HEAT/SLEEP Blink E7 Blink 6 times Blink Heat, Cool, follow by Fan, Dry Blink E8 Remark: The unit will not detect sensor missing when the compressor is ON 4.10 Gas Leak (Outdoor unit abnormal) This option is selected via resistor RGL. The gas leak is declared if indoor coil temperature is > 25 C in cooling cycle or < 20 C in heating cycle. The system will check the gas leak mode if compressor run time of 30 minutes is achieved. If above condition is met, the system will reconfirm the indoor coil temperature for another 5 minutes before declaring the gas leak mode. No gas leak checking during outdoor defrost. The compressor run timer will be reset. 28

30 5 OnTAC Activation This feature is to force the compressor on for approximately 10 minutes irrespective of room temperature and compressor minimum off time protection. Besides the compressor minimum off time, other protections are still available. This feature is allowed to be activated once every power on reset and is activated by pressing the emergency on/off button for more than 5 seconds. To activate OnTac in cooling cycle, ensure the unit to off mode first. Then press the button for more than 5 seconds. To activate the OnTac in heating cycle, set the unit to cool mode first before pressing the button for more than 5 seconds. 6 Hardware Selections There are 2 resistors (Rxxx) used in the board to configure various board operations:- 6.1 RFAN There are two 3-way JUMPER HEADER used in the board to configure board s HOT KEEP specifications: MODEL PIN 12 (7.5k) PIN 23 (SHORT) OPEN - Multisplit (always using YA spec) - SD spec. (interval) - ALWAYS ON HT_KP: PIN 12 (22k) PIN 23 (7.5k) OPEN - C2 spec (Fan on, off below 18ºC). - YA spec (Fan off). - Selection at MODEL 6.2 RGL This is used to enable or disable the Gas Leak and Compressor overload options:- 110k - Gas leak on, Compressor overload manual reset, hardware overload detection off 22k - Gas leak on, Compressor overload auto reset, hardware overload detection on 7k5 - No gas leak, Compressor overload manual reset, hardware overload detection off 3k - No gas leak, Compressor overload auto reset, hardware overload detection on There are 3 diodes used in the board to configure various board operations:- 6.3 Offset temperature. (D OT ) This diode used to select set temperature offset option in heat mode. Exist - No offset Open - 2ºC is added to set temperature in heat mode. 29

31 6.4 Multi split (D MS ) This diode SHOULD NOT be opened and no longer to be used for multi split selection! Multi split can ONLY be selected by using the 3-way jumper (refer to 6.1) 6.5 Antifreeze 1ºC / 3ºC option (D 1/3C ) This diode is used to select 1ºC / 3 º C thresholds for cool mode antifreeze protection. Exist - 1ºC Open - 3ºC 6.6 Outdoor/Indoor fan speed control option (D 55/53C ) This diode is used to select 55ºC/53ºC threshold for heating mode outdoor fan and indoor fan speed control. Exist - 55ºC outdoor fan off. 53ºC indoor fan forced higher speed. Open - 53ºC outdoor fan off. 51ºC indoor fan forced higher speed. 7 Multi Split Model Most of the control algorithms for multi split model is similar to single split unless stated below: 7.1 There is no outdoor coil sensor for multi split model. If outdoor coil sensor is inserted, unit will show error. 7.2 Since the outdoor sensor is not available, the overload protection only limited to heating cycle by checking the indoor coil sensor. 7.3 No outdoor defrost cycle (Taken care by outdoor controller). 7.4 There is no gas leak detection. 7.5 Multi split Hot Start i) if the indoor coil temperature > 40 C, the indoor fan will run at user set fan speed. ii) if the indoor coil temperature < 25 C, the indoor fan speed will stop. iii) if the indoor coil temperature crosses the 30 C mark, the indoor fan speed will be changed to low. 7.6 Multi split Hot Keep Only one hot keep selection which is fan off option: i) if the indoor coil temperature > 40 C, the indoor fan will run at set speed. ii) if the indoor coil temperature crosses 37 C, the indoor fan will run at low speed. iii) if indoor coil temperature < 30 C, the indoor fan will stop. 30

32 8 Schematic Diagram Figure: 31

33 Single Split Single Compressor (SB125) 1 Introduction 1.1 Features of Entity AUTO/ COOL/ FAN/ HEAT/ DEFROST system control. Single speed indoor fan control. Single speed outdoor fan control. Real time clock Real time ON/OFF timer. SLEEP function for COOL, HEAT and AUTO mode. Cold start, Hot start and Hot keep. Memory backup (non-volatile) for last state settings option. LEDs display for POWER, COOL, FAN, HEAT, SLEEP, TIMER only On line testing activation (OnTAC) Wired control Heat Mode Offset 2 C option 1.2 Protections Self diagnostics. Indoor antifreeze for cooling cycle. Compressor recycle protection (Anti short cycle timer). Compressor random restart during 1st thermostat cut in cycle. Gas leak detection option. Compressor overload manual/auto reset option. Compressor HARDWARE overload protection option. 2 Functions 2.1 Models Models Modes AP Auto > Cool > Fan > Heat > EC Cool > Fan > 2.2 Power Up Settings During power up, the system can be configured to memorize the settings prior to power down. This is done by shorting the 2 way straight header J_LST. The settings that are memorized are:- a) Mode & On/Off status b) Set Temperature c) Fan Speed d) Key Lock (for wired control) These data or settings are saving in non-volatile memory. The system will save the updated settings into the memory 10 seconds after changes are confirmed. However, it will take 3 seconds to update the memory if the unit changes from on to off state. 32

34 If the J_LST is not shorted or memory corrupted, the default settings are a) Unit : OFF, b) Mode : COOL, c) Set Temp. : 24 C, d) Indoor fan speed: HIGH e) SWING OFF 2.3 Unit ON/OFF There are 2 ways to turn on or off the system: i) via ON/OFF triggering ii) via real-time ON/OFF timer ON/OFF triggering ON/OFF triggering can be achieved by pressing the emergency ON/OFF button or the LCD remote controller ON/OFF button. When the emergency ON/OFF button is pressed, the system mode setting will rotate in the following sequence:- MODEL SEQUENCE AP > COOL > HEAT > OFF > EC >COOL > OFF > The corresponding LEDs will also follow suit. Pressing the wired controller ON/OFF button will toggle the system status either from ON to OFF or from OFF to ON Real Time ON/OFF timer When the real time ON timer set time matches the internal real time clock, the unit will be switched on. Similarly, when the OFF time matches the real time clock, the unit is switched off. The timer settings are retained so that similar switching can occur 24 hours later. These timers will be deactivated if the emergency ON/OFF switch is pressed. 2.4 Temperature Range and Settings The operating temperature range is 16 C to 30 C (60 F to 86 F), both inclusive. Temperature setting is allowed in COOL, DRY, HEAT and AUTO modes. 2.5 Sleep Function This function will increase or decrease the set temperature with time. The COOL and HEAT mode SLEEP profile is as follows: 33

35 Mode Cool Algorithm Heat The SLEEP function is only available for COOL, HEAT and AUTO modes. Changing to other modes will inhibit the SLEEP function and the timer will be reset. Pressing the emergency ON/OFF will deactivate and clear the sleep function. This function is set/reset by the wired controller. 2.6 Indoor Fan Control Only one fan speed is available for indoor fan. 2.7 Heat Mode Offset 2 C Option If D OT is open, the HEAT mode set temperature will be added by 2 C. This option is not applicable in AUTO HEAT mode. 3 Operating Modes The system mode is set by the wired control. Mode changes respond 2 seconds after data reception. 34

36 3 Operating Mode 3.1 Cold Start When the unit restarts 2 hours after it has stopped or during power-on-reset start, it is considered a cold start. This feature is not available in sleep mode. 3.2 Cool Mode In Cool mode, the compressor will be cut in if the Tr - Ts > 0.5 C and the compressor will be cut out if the Tr < Ts C, subject to timing protections. 3.3 Fan Mode Only one speed is allowed in the fan mode. The compressor and the outdoor fan will stop. Similarly, the 4-way valve will turn off. 3.4 Heat Mode The model of heat mode is namely auto heatpump (AP) Heat Pump Model The compressor will be cut in if the Tr < Ts+1 and it will be cut out if Tr - Ts > 3.5 C, subject to timing protections. If D OT is open, the HEAT mode set temperature will be added by 2 C Hot Start During the cut in cycle, the indoor fan speed will modulate according to the indoor coil temperature: i) if the indoor coil temperature > 40 C, the indoor fan will run. ii) if the indoor coil temperature < 18 C, the indoor fan speed will stop. iii) if the indoor coil temperature crosses the 30 C mark, the indoor fan speed will run Hot Keep When the compressor cuts out, the unit is in hot keep mode. There are 4 options of Hot Keep: Fan Always on option For thermostat cycle cut offs, the following hot keep cycle will apply: i) if the indoor coil temperature > 40 C, the indoor fan will run. ii) if the indoor coil temperature crosses below 37 C, the indoor fan will run. Fan on option The start of heat mode, is defined as when: a) the unit is just turned on from off with setting in Heat mode OR b) the mode changes from non-heat to Heat mode OR c) just after the end of a defrost cycle, The hot keep cycle at the start of heat mode will be as follow : 35

37 i) if the indoor coil temperature > 40 C, the indoor fan will run. i) if the indoor coil temperature crosses 37 C, the indoor fan will run. ii) if indoor coil temperature < 33 C, the indoor fan will stop. For thermostat cycle cut offs, the following hot keep cycle will apply: i) if the indoor coil temperature > 40 C, the indoor fan will run. ii) if the indoor coil temperature crosses 37 C, the indoor fan will run. iii) if indoor coil temperature < 18 C, the indoor fan will stop. Fan off option i) if the indoor coil temperature > 40 C, the indoor fan will run. ii) if the indoor coil temperature crosses 37 C, the indoor fan will run. iii) if indoor coil temperature < 33 C, the indoor fan will stop. Fan low cycle on & off option The fan will cut in for 30 seconds and subsequently off for 120 seconds. These cycle of on and off will repeat way valve switching To run heat pump, the 4-way valve must turn ON. Upon return to a non-heat pump mode, the 4-way must turn OFF. The 4-way valve can only be changed 55+/- 5 seconds after the compressor has been cut out. Then the compressor may be cut in 4 seconds later Auxiliary Heater This option is available for heatpump model only. It operates during heatpump thermostat cut in cycle and is subjected to the following conditions:- a) It can only cut in after the indoor fan has cut in for at least 30 seconds. b) It must cut out for at least 30 seconds before the indoor fan can cut off. c) It must cut out if room temperature > 25 C. It is allowed to cut in if room temperature < 22.5 C. d) It must cut out if indoor coil temperature > 55 C. It is allowed to cut in if indoor coil temperature < 48 C. e) During cold start, it is allowed to cut in if outdoor coil temperature < 5 C. f) It will cut in if room temperature is 3.5 C below set temperature and it will cut out if room temperature is 1.0 C below set temperature. g) It is allowed to cut in during heatpump thermostat cut in cycle. For case (b), the auxiliary heater & indoor fan will cut out immediately during off mode & outdoor defrost cycle. 3.5 Auto Mode Under AUTO mode, the mode can be selected automatically between Heat and Cool mode, depending on the room temperature and Set Temperature. There is no cold start in Auto mode. If the present Auto mode is Cool, its mode Set Temperature is the same as the user Set Temperature. This mode will only change to Heat mode if:- i) Tr <= Ts mode C AND ii) The compressor has cut out for at least 10 minutes. 36

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