Page 3 - TABLE OF CONTENTS
i T-308 05/09 TABLE OF CONTENTS Section Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SAFETY SUMMARY Safety-- 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....
Page 4 - ii; ELECTRICAL
ii T-308 05/09 TABLE OF CONTENTS -- Continued: 4.4 PUMPING THE SYSTEM DOWN OR REMOVING THE REFRIGERANT CHARGE 4-- 3 . . . . . . 4.4.1 System Pump Down For Low Side Repair 4-- 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.4.2 Refrigerant Removal From An Inoperative...
Page 5 - iii; LIST OF ILLUSTRATIONS; Figure; LIST OF TABLES; Table
iii T-308 05/09 LIST OF ILLUSTRATIONS Figure Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 1-- 1 Coach Cutaway View 1-- 2 . . . . . . . . . . . . . . . . . . . . . . . . . ...
Page 6 - SAFETY SUMMARY; GENERAL SAFETY NOTICES; Always wear safety glasses.; MAINTENANCE PRECAUTIONS
Safety-- 1 T-- 336 05/09 SAFETY SUMMARY GENERAL SAFETY NOTICES The following general safety notices supplement the specific warnings and cautions appearing elsewhere in thismanual. They are recommended precautions that must be understood and applied during operation and maintenanceof the equipment c...
Page 7 - SPECIFIC WARNINGS AND CAUTIONS
Safety-- 2 T-- 336 05/09 SAFETY SUMMARY SPECIFIC WARNINGS AND CAUTIONS WARNING Be sure to observe warnings listed in the safety summary in the front of this manual before perform-ing maintenance on the hvac system WARNING Read the entire procedure before beginning work. Park the coach on a level sur...
Page 8 - INTRODUCTION
T-- 336 1-- 1 05/09 SECTION 1 DESCRIPTION 1.1 INTRODUCTION This manual contains Operating Instructions, ServiceInstructions and Electrical Data for the Model DC12175and DC12174 Air Conditioning equipment furnished byCarrier Transport Air Conditioning as shown inTable 1-- 1. Additional support manual...
Page 11 - Superheat Setting: 10
T-- 336 1-- 4 05/09 SOCKET Figure 1-- 3 Relay Board 1.4 REFRIGERANT SYSTEM COMPONENT SPECIFICATIONS a. Refrigeration Charge Approximate R134a refrigerant charge will be be-tween 14 and 19 pounds, dependent upon condens-er type and placement. b. Compressors Model: 05GNo. of Cylinder: 6Weight (Dry): 1...
Page 15 - CONDENSER
T-- 336 1-- 8 05/09 CONDENSER KR-- 4 EM -- 17 EVAPORATOR 13 12 1 2, 3 4 5 6 7 8 9 10 11 14 15 16 UPS3 CFS1 CFS2 UPS2 UPS1 17, 18 1. Compressor 2. Discharge Service Port 3. High Pressure Switch 4. Discharge Line 5. Discharge Check Valve 6. Receiver 7. Fusible Plug 8. Sight Galss 9. Filter Drier Inlet...
Page 16 - STARTING ANDSTOPPING INSTRUCTIONS
T-- 336 2-- 1 05/09 SECTION 2 OPERATION 2.1 STARTING ANDSTOPPING INSTRUCTIONS 2.1.1 Starting a. Start the vehicle engine. The evaporator (interior) fans will start as soon as power is available from thevehicle electrical system. b. The drivers control is equipped with a single HIGH-- OFF-- LOW switc...
Page 17 - re; SEQUENCE OF OPERATION
T-- 336 2-- 2 05/09 a. Temperature Control The unloaders are operaed as follows for temperaturecontrol: 1 Compressor Unloader UV1. When return air temper- ature falls to less than 2 ° F (1.1 ° C) above set point unloader UV1 is energized. If temperature rises togreater than 3 ° F (1.7 ° C) above set...
Page 21 - WARNING; Check and drain shaft seal reservoir, (05G Manual) If Applicable
T-336 4-- 1 05/09 SECTION 4 SERVICE WARNING Be sure to observe warnings listed in the safety summary in the front of this manual before perform-ing maintenance on the hvac system. WARNING Beware of rotating fan blades and unannounced starting of fans or compressor. WARNING Read the entire procedure ...
Page 22 - Figure 4-- 1 Suction or Discharge Service Valve; CAUTION
T-336 4-- 2 05/09 backseated positions, the suction or discharge gaugeport is open to both the compressor and the line. SERVICEPORT (R-22) VALVE STEM CAP VALVESTEM TO DISCHARGE ORFROM SUCTION LINE PORT TOCOMPRESSOR Service ValveFrontseated(clockwise) Service ValveBackseated(counterclockwise) ACCESS ...
Page 23 - NOTE
T-336 4-- 3 05/09 Opened(Backseated )Hand Valve Closed(Frontseated)Hand Valve To Low SideAccess Valve To High SideAccess Valve (Red Knob) (Blue Knob) 1 4 3 YELLOW 2 4 5 6 3 RED 3 BLUE 2 1. Manifold Gauge Set2. Hose Fitting (0.5-16 Acme)3. Refrigeration and/or Evacuation Hose. (SAE J2196/R-134a) 4. H...
Page 26 - Procedure for Evacuation and Dehydrating
T-336 4-- 6 05/09 f. Break the vacuum with nitrogen. Raise system pres- sure to approximately 2 psig. g. Purge the nitrogen from the system. h. Repeat steps d. thru g. one time. i. Start vacuum pump and open all valves. Dehydrate unit to 500 microns Hg vacuum. j. Close off pump valve, and stop pump....
Page 28 - Figure 4-- 8 Checking High Pressure Switch
T-336 4-- 8 05/09 1. Cylinder Valve and Gauge 2. Pressure Regulator 3. Nitrogen Cylinder 4. Pressure Gauge (0 to 400 psig = 0 to27.22 bar) 5. Bleed-Off Valve 6. 1/4 inch Connection 1 2 3 4 5 6 Figure 4-- 8 Checking High Pressure Switch c. Connect an ohmmeter across switch terminals. d. Set nitrogen ...
Page 31 - Figure 4-- 15 Removing Bypass Piston Plug
T-336 4-- 11 05/09 filter will restrict air flow over the evaporator coil whichmay cause insufficient cooling or heating and possiblefrost buildup on the coil. To remove the filters, do thefollowing. a. Place main battery disconnect switch in OFF position and lock. b. Remove the return air grille. c...
Page 33 - PRESSURE
T-336 4-- 13 05/09 WARNING Extreme care must be taken to ensure thatall the refrigerant has been removed fromthe compressor crankcase or the resultantpressure will forcibly discharge compres-sor oil. 2. Drain or pump out compressor oil until the level is brought to the proper level. 3. Evacuate the ...
Page 34 - ELECTRIC COMPRESSOR UNLOADERS; The electric unloaders are activated by an
T-336 4-- 14 05/09 4.17 REPLACING SENSORSa. Place main battery disconnect switch in OFF position and lock. b. Tag and disconnect wiring from defective sensor.c. Remove and replace defective sensor. Sensor con- nections are fitted with Schreader valves to facilitatereplacement. d. Connect wiring to r...
Page 37 - DESCRIPTION
T-- 336 5-- 2 05/09 SYMBOL DESCRIPTION ACMS A/C MODE SWITCH ACR A/C RELAY ACSL A/C STOP LIGHT ACSR1 A/C STOP RELAY #1 (TIME DELAYED) ACSR2 A/C STOP RELAY #2 (TIME DELAYED) ALT ALTERNATOR CFR1 -- CFR3 CONDENSER FAN RELAYCFS1 -- CFS2 CONDENSER FAN SPEED SWITCHCL CLUTCH CF1 -- CF5 CONDENSER FAN MOTORS ...
Page 40 - INDEX; Index 1
INDEX Index 1 T-- 336 05/09 A Air Filter, 4-- 10 Ambient Lockout, 1-- 6 C Clutch, 2-- 2, 4-- 12 Compressor, 4-- 11 Condenser Fan, 2-- 2 Cooling Mode, 2-- 1 D DESCRIPTION, 1-- 1 Discharge Pressure, 2-- 2 E ELECTRICAL, 5-- 1 Evacuation, 4-- 5 Evacuation, One Time, 4-- 6 Evacuation, Triple, 4-- 5 F Fil...
Page 41 - Index 2
INDEX Index 2 T-- 336 05/09 T Temperature Control, 2-- 1, 2-- 2 Temperature Pressure Chart, 4-- 15 Temperature Sensor, 1-- 5, 4-- 13, 4-- 14 Thermostatic Expansion Valve, 4-- 9 TROUBLESHOOTING, 3-- 1 U Unloaders, 2-- 1 V Vent Mode, 2-- 1 W Wiring Schematics, 5-- 1
