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1 *TM TECHNICAL MANUAL Operator s, Unit, Direct Support, And General Support Maintenance Manual AIR CONDITIONER, VERTICAL, COMPACT, 18,000 BTU/HR 208 VOLT, 3 PHASE, 50/60 HERTZ NSN DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited * This manual supersedes TM , dated 8 May HEADQUARTERS, DEPARTMENT OF THE ARMY 15 SEPTEMBER 1993

2 *TM TECHNICAL MANUAL NO Operator s, Unit, Direct Support and General Support Maintenance Manual AIR CONDITIONER, VERTICAL COMPACT 18,000 BTU/HR 208 VOLT, 3-PHASE, 50/60 HERTZ NSN HEADQUARTERS DEPARTMENTS OF THE ARMY WASHINGTON D. C., 15 September 1993 REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS You can help improve this manual. If you find any mistakes or if you know of a way to improve the procedures, please let us know. Mail your letter or DA Form 2028 (Recommended Changes to Publications and Blank Forms), or DA Form located in the back of this manual directly to: Commander, US Army Aviation and Troop Command, ATTN: AMSAT-I-MP, 4300 Goodfellow Blvd., St. Louis, MO A reply will be furnished directly to you. DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. TABLE OF CONTENTS CHAPTER 1 Section Ill. CHAPTER 2 Section Ill. Section IV. CHAPTER 3 CHAPTER 4 Section Ill. Section IV. Section V. Section VI. Section VIl. CHAPTER 5 section Ill. CHAPTER 6 APPENDIX A INTRODUCTION General Information Equipment Description and Data Technical Principles of Operation OPERATING INSTRUCTIONS Description and Use of Operator s Controls and Indicators Operator Preventive Maintenance Checks and Services (PMCS) Operation Under Usual Conditions Operation Under Unusual Conditions OPERATOR S MAINTENANCE INSTRUCTIONS Lubrication Instructions Troubleshooting Procedures UNIT MAINTENANCE INSTRUCTIONS Repair Parts, Special Tools, TMDE, and Support Equipment Service Upon Receipt of Equipment Lubrication Preventive Maintenance Checks and Services (PMCS) Troubleshooting Maintenance Procedures Preparation for Storage or Shipment DIRECT SUPPORT MAINTENANCE INSTRUCTIONS Repair Parts, Special Tools, TMDE, and Support Equipment Troubleshooting Maintenance Procedures GENERAL SUPPORT MAINTENANCE INSTRUCTIONS Repair Parts, Special Tools, TMDE, and Support Equipment Authorized General Support Maintenance Actions REFERENCES Page A-1 x This Manual supersedes TM , dated 8 May i

3 TABLE OF CONTENTS (CONTINUED) APPENDIX B MAINTENANCE ALLOCATION CHART Introduction Maintenance Allocation Chart For Air Conditioner Section Ill. Tool and Test Equipment Requirements Maintenance Allocation Chart Section IV. Remarks APPENDIX C COMPONENTS OF END ITEM AND BASIC ISSUE ITEMS LIST Introduction Components of End Item Section Ill. Basic Issue Items APPENDIX D ADDITIONAL AUTHORIZATION LIST Introduction Additional Authorization List APPENDIX E EXPENDABLE SUPPLIES AND MATERIALS LIST Introduction Expendable Supplies and Materials List ALPHABETICAL INDEX Page B-1 B-1 B-4 B-7 B-7 C-1 C-1 C-2 C-3 D-1 D-1 D-1 E-1 E-1 E-2 l-1 NUMBER LIST OF ILLUSTRATIONS TITLE Air Conditioner Location of Major Components Refrigeration Schematic Operator s Controls Front Operator s Controls Rear Fabric Cover Air Openings and Drains VENTILATE Control Setting Fresh Air Damper (Door) Adjustment Louver Adjustment LO HEAT Control Setting Fresh Air Damper (Door) Adjustment Louver Adjustment HI HEAT Control Setting Fresh Air Damper (Door) Adjustment Louver Adjustment Fabric Cover Fabric Cover COOL Control Setting Fresh Air Damper (Door) Adjustment Louver Adjustment OFF Setting Information Plates Unpacking Installation Dimensions (Sheet 1 of 4) Installation Dimensions (Sheet 2 of 4) Installation Dimensions (Sheet 3 of 4) Installation Dimensions (Sheet 4 of 4) PAGE ii

4 *TM LIST OF ILLUSTRATIONS (CONTINUED) NUMBER TITLE PAGE Intake Grille and Filter Control Panel Sensing Bulb Secured for Remote Mounting Block Off Assembly Installation Interconnecting Remote Control Cable Diagram Alternate Cable Connections Through Return (Intake) Duct Alternate Input Power Connector Locations Cover Plate Removal/Installation J1 to P13 Harness Removal Receptacle (J13) Fabric Cover Removal Wiring Diagram (Sheet 1 of 3) Wiring Diagram (Sheet 2 of 3) Wiring Diagram (Sheet 3 of 3) Electrical Schematic Input Power Cable Diagram Fabric Cover CBR Duct Cover Access (Service Valves) Cover Connector Cover Plates Side Access Plate Discharge (Outlet) Grille Assembly Intake Grille Assembly Condenser (Fan) Guard Condenser Coil Guard Top Panel Circuit Breaker Access Panel Filter Mounting Plate Rear Panel Fresh Air (Inlet) Screen Conditioned Air Filter Fresh Air Filter Mist Eliminator Intake Grille and Filter Control Panel Wiring Harness, Control Panel Temperature Control Thermostat (S2) Mode Selector (Rotary) Switch (S1) Switch Position and Terminal Identification Control Panel Housing Block Off Assembly Prior to Installation Block Off Assembly Installed Wiring Harnesses Radio Frequency Filter (FL1) Junction Box Removal/Installation * iii

5 LIST OF ILLUSTRATIONS (CONTINUED) NUMBER TITLE Reset Control Wire Connection Junction Box Cover Circuit Breaker External Reset Junction Box Wiring Harnesses Transformer (T1) Circuit Breaker (CB1) Fuses (F1, F2, and F3) Rectifier (CR1) Time Delay Relay (K3) Compressor Start Relay (K1) Heater Relay (K2) Fan Motor Relay (K4) Terminal Boards (TB1 and TB2) Junction Box Housing, Panel, and Cover Heater Cutout (Thermostat) Switch (S4) Heater Support Electric Heater (Elements) HR1 thru HR6) Evaporator Fan Evaporator Inlet Bell Evaporator and Condenser Fan Motor (B2) and Condenser Fan Evaporator Coil Condenser Coil Condensate Drain Traps Evaporator and Condenser Fan Motor (Welco) Evaporator and Condenser Fan Motor (lmc) Access (Service Valve) Cover Discharging Refrigerant Nitrogen Purging Connection Evacuation of Refrigeration System Refrigerant Charging Service Valve Caps and Covers Access (Service Valve) Cover Pressure Test Connection Desiccant Refrigerant Dehydrator (Filter Drier) Low Pressure Cut-Out Switch (S7) High Pressure Cut-Out Switch (S6) Service Valves Solenoid Valve Coil Replacement Solenoid Valves (L1 and L-2) Liquid Quench Expansion Valve Compressor Schematic Compressor Replaceable Items Compressor (B1) Liquid Sight Indicator (Sight Glass) Expansion Valve Mist Eliminator Evaporator Coil Pressure Regulating Valve Access Pressure Regulating Valve PAGE iv

6 *TM LIST OF ILLUSTRATIONS (CONTINUED) NUMBER C-1 Receiver Pressure Relief Valve Condenser Coil Fresh Air Damper Lifting Handles Components of End Item TITLE LIST OF TABLES PAGE C-2 NUMBER TITLE Operator Preventive Maintenance Checks and Services Operatoring Settings Operator s Troubleshooting Unit Preventive Maintenance Checks and Services (PMCS) Unit Troubleshooting Wire List Rectifier Test Troubleshooting for Direct Support Maintenance Pressure-Temperature Relationship of Saturated Refrigerant-22 Normal Operating Pressures (In Full Cooling Decrease Mode) Normal Operating Pressure (In By-Pass Cycle) PAGE v

7 Figure. Air Conditioner 1-0

8 CHAPTER 1 INTRODUCTION GENERAL INFORMATION. SCOPE. a. Type of Manual: Operator s, Unit, Direct Support and General Support Maintenance Manual. b. Model Number and Equipment Name: ATACS Model ECU18VC326 Vertical, Compact, 18,000 BTU/HR, 208 Volt, 3-Phase, 50/60 Hertz Air Conditioner. c. Purpose of Equipment: Cools, heats and ventilates enclosed spaces. The unit covered by this manual is designed for cooling and heating air to a desired predetermined range and circulating the conditioned air to provide heating and cooling of equipment or personnel within the conditioned area MAINTENANCE FORMS AND RECORDS. Department of the Army forms and procedures used for equipment maintenance will be those prescribed by DA PAM , The Army Maintenance Management System (TAMMS) REPORTING EQUIPMENT IMPROVEMENT RECOMMENDATIONS (EIRs). If your air condtioner needs improvement, let us know. Send us an EIR. You, the user, are the only one who can tell us what you don't like about your equipment. Let us know why you don't like the design or performance. Tell us why a procedure is hard to perform. Put it on an SF-368 (Quality Deficiency Report). Mail it to us at Commander, Headquarters, U.S. Army Aviation and Troop Command, ATTN: AM- SAT-I-MDO, 4300 Goodfellow Boulevard, St Louis, MO We ll send you a reply DESTRUCTION OF ARMY MATERIEL TO PREVENT ENEMY USE. Command decisions, according to the tactical situation, will determine when destruction of the air conditioning unit will be accomplished. A destruction plan will be prepared by the using organization, unless one has been prepared by higher authority. For general destruction procedures for this equipment, refer to TM , Procedures for Destruction of Equipment to Prevent Enemy Use PREPARATION FOR STORAGE OR SHIPMENT. Administrative storage of the air conditioner shall conform generally with the provisions of TM , Administrative Storage of Equipment 1-6. PURPOSES, CAPABILITIES, AND FEATURES. EQUIPMENT DESCRIPTION AND DATA a. Purpose of ECU18VC326 Air Codtioner. The Air Conditioner is designed to ventilate, cool or heat, and to filter air b. Capabilities and features: (1) (2) (3) (4) (5) (6) (7) (8) (9) Provides a maximum of 18,000 BTU/HR of cooling or 12,000 BTU/HR of heating. Has two stages of heat. Provides source of filtered outside (fresh) ventilation air. Is self contained in a single cabinet that is ideally suited for van, shelter, or room installations. Operates in environmental conditions from tropic to arctic. Is fully portable. Has connection point for an NBC (nuclear, biological, chemical filter). Has alternate power input connection locations to provide for a variety of installations. Designed for low-noise level operation.

9 1-7. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS Figure 1-2. Location of Major Components CONDITIONED AIR (EVAPORATOR) FAN - Draws air into the evaporator section and exhausts it through the evaporator (cooling) coil and heater elements into the room or enclosure. HEATER ELEMENTS (HR 1 through HR 6) - Consists of two banks of three elements each. Only one bank operates in the LO HEAT mode. Both banks operate in the HI HEAT mode, however the temperature control thermostat controls only one bank. MIST ELIMINATOR - Prevents condensate (water) from being blown from the coil into the room or enclosure. CONDITIONED AIR DISCHARGE GRILLE - Adjustable louvers allow directional control of conditioned air. RETURN AIR FILTER - Provides filtered return air. INTAKE (RETURN) AIR GRILLE - Adjustable louvers allow control of outside (fresh) and return (from room or enclosure) air. CONTROL PANEL - Contains a five position mode selector switch and a temperature control thermostat. JUNCTION BOX - Contains and protects electrical system control devices. EVAPORATOR COIL - Serves as a heat exchanger by transferring heat from the air passing over the tubing and fins to the refrigerant passing through the tubing. FABRIC COVER - Shown on rearview in stowed (operational) position. When rolled down and snapped it protects the rear (exposed) surface of the unit. FRESH AIR FILTER AND DAMPER - Provides filtered outside air. 1-2