Related Manuals for Carrier EM-17
Summary of Contents for Carrier EM-17
- Page 1 Transport Air Conditioning OPERATION AND SERVICE EM- -17 Large Split Systems DC12174 & DC12175 T--336 05/09...
- Page 2 OPERATION & SERVICE MANUAL AIR CONDITIONING EQUIPMENT MODEL EM- -17 Large Split System DC12174 DC12175...
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Page 3: Table Of Contents
TABLE OF CONTENTS Section ................Page SAFETY SUMMARY . - Page 4 TABLE OF CONTENTS - - Continued: 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 Compressor.
- Page 5 LIST OF ILLUSTRATIONS Figure ................. Page Figure 1--1 Coach Cutaway View .
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Page 6: Safety Summary
SAFETY SUMMARY GENERAL SAFETY NOTICES The following general safety notices supplement the specific warnings and cautions appearing elsewhere in this manual. They are recommended precautions that must be understood and applied during operation and maintenance of the equipment covered herein. The general safety notices are presented in the following three sections labeled: First Aid, Operating Precautions and Maintenance Precautions. - Page 7 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 surface, with parking brake applied.
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Page 8: Description
Instructions and Electrical Data for the Model DC12175 1.1.2 Condensing Section and DC12174 Air Conditioning equipment furnished by Carrier Transport Air Conditioning as shown in The condensing section includes the condenser coil (s) Table 1--1. Additional support manuals are referenced fan and motor assemblies, filter--drier, receiver (with in Table 1--2. -
Page 9: Figure 1--1 Coach Cutaway View
Figure 1- -1 Coach Cutaway View 1Drivers Control 4EM--17 Evaporator Assembly 2CM--5 Condenser (DC12175) 5Compressor Assembly 3KR--4 Rooftop Condenser (DC12174) 6Control Box (TBB) Table 1- -1 Model ELECTRONIC MODEL COMPRESSOR. CONDENSOR EVAPORATOR THERMOSTAT DC12174 KR--4 EM--17 Single Loop DC12175 CM--5 EM--17 Single Loop Table 1- -2 Additional Support Manuals MANUAL/FORM NUMBER... -
Page 10: System Operating Controls And Components
SYSTEM OPERATING CONTROLS AND 2 Manual Switches COMPONENTS A/C Mode Switch (ACMS) 1 Electronic Thermostat (TH) The drivers control is equipped with a single The system is equipped with an electronic HIGH--OFF--LOW switch. The switch is placed in the thermostat which operates in combination with a desired fan speed postion to start temperature control. -
Page 11: Refrigerant System Component Specifications
SOCKET Figure 1- -3 Relay Board REFRIGERANT SYSTEM COMPONENT NOTE SPECIFICATIONS Refer to 05g or 05K Operation and Service manuals for additional technical data, including a. Refrigeration Charge approved oils and oil capacity. Approximate R134a refrigerant charge will be be- d. -
Page 12: Safety Devices
SAFETY DEVICES The system circuits are protected independently against high current draw with fuses F2 & F4 through System components are protected from damage F14 and vehicle main power fuse. Refer to the caused by unsafe operating conditions with safety schematic diagram in Section 5 for fuse locations. -
Page 13: Safety Devices
Heat transfer is established caused by unsafe operating conditions with safety from the refrigerant (inside the tubes) to the condenser devices. Safety devices with Carrier Transicold supplied air (flowing over the tubes). The condenser tubes have equipment include high pressure switch (HPS), low fins designed to improve the transfer of heat from the pressure switch (LPS), circuit breakers and fuses. -
Page 14: Figure 1--4 Refrigerant Flow Diageam (Dc12175)
CM- -5 CONDENSER UPS3 CFS1 CFS2 EM- -17 EVAPORATOR UPS1 UPS2 Compressor Filter--Drier Outlet Valve Discharge Line Thermostatic Expansion Valve Discharge Line Check Valve Evaporator Coil Condenser Coil Suction Line Receiver Liquid Line Solenoid Valve (LSV) Filter--Drier Inlet Valve Discharge Service Port Filter--Drier Suction Service Port Figure 1- -4 Refrigerant Flow Diageam (DC12175) -
Page 15: Figure 1--5 Refrigerant Flow Diagram Dc12174
KR- -4 CONDENSER UPS3 CFS1 CFS2 EM- -17 EVAPORATOR UPS1 UPS2 2, 3 17, 18 Compressor Filter Drier Discharge Service Port Filter Drier Outlet Valve High Pressure Switch Subcooler Discharge Line Liquid Line Discharge Check Valve Liquid Line Solenoid Valve (LSV) Receiver Thermostatic Expansion Valve Fusible Plug... -
Page 16: Operation
SECTION 2 OPERATION 2.1 STARTING ANDSTOPPING INSTRUCTIONS Rising Temperature 2.1.1 Starting 5°F Above Fully Loaded Coil a. Start the vehicle engine. The evaporator (interior) 5°F Setpoint fans will start as soon as power is available from the vehicle electrical system. 4°F b. -
Page 17: Condenser Fan Control
a. Temperature Control 2.4 SEQUENCE OF OPERATION The unloaders are operaed as follows for temperature Operation begins when the A/C mode switch (ACMS) is control: placed in the HIGH or LOW position. This provides: 1 Compressor Unloader UV1. When return air temper- a signal the vehicle to apply 24V power from the ature falls to less than 2°F (1.1°C) above set point vechcle alternator to the ALT+ terminal (Refer to wiring... - Page 18 Once the temperature approaches set point, the unloading. thermostat will call for the system to unload. With the If either HPS or LPS open, relay FR is de--energized. thermostat calling for unloading, unloader valve UV1 is De--energizing FR opens a set of contacts to energized.
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Page 19: Troubleshooting
SECTION 3 TROUBLESHOOTING Table 3-1 General System Troubleshooting Procedures INDICATION/ REFERENCE POSSIBLE CAUSES TROUBLE SECTION System Will Not Cool Compressor will not run V-Belt loose or defective Check Clutch coil defective Check/Replace Clutch malfunction Check/Replace Compressor malfunction See Table 1--2 Electrical malfunction Coach power source defective Check/Repair... -
Page 20: Abnormal Noise Or Vibrations
Table 3-1 General System Troubleshooting Procedures - Continued INDICATION/ REFERENCE POSSIBLE CAUSES TROUBLE SECTION Abnormal Noise Or Vibrations - Continued Condenser or evaporator fans Loose mounting hardware Check/Tighten Defective bearings Replace Blade interference Check Blade missing or broken Check/Replace Control System Malfunction Will not control Sensor or Relay(s) defective Check... -
Page 21: Service
To avoid damage to the earth’s ozone layer, use a refrigerant recovery system whenever removing refriger- ant. The refrigerant recovery system is available from Carrier Transicold (Carrier Transicold P/N MVSll--115 or MVSll--240). When working with refrigerants you must comply with all local government environmental laws. -
Page 22: Installing Manifold Gauge Set
The manifold gauge/hose set is available from Carrier Transicold. (Carrier Transicold P/N TO DISCHARGE OR VALVE STEM CAP 07-00294-00, which includes items 1 through 6, FROM SUCTION LINE Figure 4--3). -
Page 23: System Pump Down For Low Side Repair
Close off pump valve, isolate vacuum gauge and stop pump. Wait 5 minutes to verify that vacuum holds. The vacuum pump is available from Carrier Transicold (Carrier Transicold P/N 07--00176--11). i. Recharge low side with R-134a to 20 to 30 PSIG by admitting vapor from the refrigerant cylinder. -
Page 24: Refrigerant Removal From An Inoperative Compressor
1. Filter-Drier Outlet 6. Vacuum Pump 1. Discharge Service 4. Vacuum Pump Service Valve 7. Refrigerant Cylinder Valve and Port 5. Reclaimer 2. Manifold Gauge 8. Reclaimer 2. Suction Service 6. Refrigerant Cylinder 9. Thermostatic Valve and Port 7. Thermistor Vacuum 3. -
Page 25: Removing Entire System Charge
g. Once vacuum is maintained, re-connect low pressure c. Add sufficient nitrogen to raise system pressure to switch. Backseat compressor service valves and dis- 150 to 200 psig (10.21 to 13.61 bar). connect manifold gauge set. d. Check for leaks. The recommended procedure for finding leaks in a system is with an electronic leak de- h. -
Page 26: Procedure For Evacuation And Dehydrating System (One Time Evacuation)
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. -
Page 27: Adding Refrigerant To System
4.7 ADDING REFRIGERANT TO SYSTEM c. Run the unit in the cool mode as described in section 4.7.1. With the suction service valve midseated, open 4.7.1 Checking Refrigerant Charge the refrigerant cylinder valve and add vapor charge until the refrigerant level appears in the liquid line The following conditions must be met to accurately sight glass. -
Page 28: Figure 4--8 Checking High Pressure Switch
1/4 Turn Cam Locks Cylinder Valve and Gauge Pressure Regulator Nitrogen Cylinder Pressure Gauge (0 to 400 psig = 0 to 27.22 bar) Bleed-Off Valve 1/4 inch Connection Figure 4- -9 Condenser Cover Removal Figure 4- -8 Checking High Pressure Switch 4.11 FILTER-DRIER c. -
Page 29: Figure 4--11 Liquid Line Solenoid Valve
d. Remove coil retaining clip and nameplate. WARNING e. Lift burned-out coil from enclosing tube and replace. f. Connect wire leads and test operation The filter-drier may contain liquid refriger- 4.12.2 Internal Part Replacement ant. Slowly loosen the flare nuts to avoid re- frigerant contact with exposed skin or eyes. -
Page 30: Figure 4--12 Thermostatic Expansion Valve
4.13.2 Superheat Measurement NOTE All readings must be taken from the TXV bulb location and out of the direct air stream. 1. Suction Line 4. Thermocouple (section view) 5. TXV Bulb (Shown 2. TXV Bulb Clamp in the 4’clock 1. Power Head 4. -
Page 31: Figure 4--15 Removing Bypass Piston Plug
filter will restrict air flow over the evaporator coil which may cause insufficient cooling or heating and possible frost buildup on the coil. To remove the filters, do the following. a. Place main battery disconnect switch in OFF position and lock. b. -
Page 32: Figure 4--16 Compressor Clutch
ate compressor to 500 microns. Front seat both man- the same orientation as it was mounted on the original ifold valves to isolate the pump. compressor. Tighten the mounting bolts to 45-50 ft/ lbs (5.53-6.92 mkg). m.Open compressor service valves. n. -
Page 33: Table 4--1 Temperature Sensor Resistance
has been de--energized and the compressor is now in WARNING 4 cylinder operation. i. Continue to slowly back--seat the suction service Extreme care must be taken to ensure that valve and watch the suction gauge. When the suction pressure gauge “jumps” (3 to 5 psi-- 0.2 to 0.4 bar) all the refrigerant has been removed from note the pressure at which the gauge jumped in the the compressor crankcase or the resultant... -
Page 34: Figure 4-10. Electric Unloader Schematic
4.17 REPLACING SENSORS Pressure switches UPS1 and UPS2 are installed in the suction return line to the compressor. Each switch a. Place main battery disconnect switch in OFF position monitors suction pressure and operates one unloader and lock. by controlling the voltage applied to the unloader coil. b. -
Page 35: Table 4--2 R-134A Temperature - Pressure Chart
Table 4- -2 R-134a Temperature - Pressure Chart Temperature Vacuum Temperature Pressure ° ° ° ° “/hg Kg/cm@ Psig Kg/cm@ 14.6 37.08 0.49 24.5 1.72 1.69 26.1 1.84 1.80 12.3 31.25 0.42 27.8 1.95 1.92 24.64 0.33 29.6 2.08 2.04 17.00 0.23 31.3... -
Page 36: Figure 5--1 Electrical Control Panel Relay Board (Rb) & Electronic Thermostat (Th) Outline Views
SECTION 5 ELECTRICAL 5- -1 INTRODUCTION This section contains electrical wiring schematics covering the models listed in Table 1--1. The schematics shown in this section provides information for all system models and optional configurations. The EM--17 evaporators are fitted with 2 blower/motor assemblies. The CM--5 Skirt--Mounted Condenser has 5 fan/motor assemblies and the KR--4 Rooftop Condenser has 4 fan/motor assemblies. -
Page 37: Figure 5--2 Schematic
SYMBOL DESCRIPTION ACMS A/C MODE SWITCH A/C RELAY ACSL A/C STOP LIGHT ACSR1 A/C STOP RELAY #1 (TIME DELAYED) ACSR2 A/C STOP RELAY #2 (TIME DELAYED) ALTERNATOR CFR1 -- CFR3 CONDENSER FAN RELAY CFS1 -- CFS2 CONDENSER FAN SPEED SWITCH CLUTCH CF1 -- CF5 CONDENSER FAN MOTORS... - Page 38 F8 AND CF3 ON DC12175 ONLY OPEN P- -RISE 360 +/- - 10 OPEN P- -DROP 6 +/- - 3 CLOSE P- -DROP 285 +/- - 15 CLOSE P- -RISE 25 +/- - 5 CLOSE P- -DROP 23 +/- -1 OPEN P- -RISE 31 +/- - 3 CLOSE P- -RISE 320 +/- - 10 OPEN P- -DROP 250 +/- - 15...
- Page 39 Reference 98- -62158/98- -62678 Figure 5- -2 Schematic (Sheet 3 of 3) T--336 5--4 05/09...
- Page 40 INDEX Low Pressure Switch, 1--6, 4--7 Air Filter, 4--10 Ambient Lockout, 1--6 Maintenance Schedule, 4--1 Modes Of Operation, 2--1 Clutch, 2--2, 4--12 Compressor, 4--11 Condenser Fan, 2--2 Noncondensibles, Check For, 4--7 Cooling Mode, 2--1 Oil Level, 4--12 DESCRIPTION, 1--1 Operating Instructions, 2--1 Discharge Pressure, 2--2 OPERATION, 2--1 ELECTRICAL, 5--1...
- Page 41 INDEX Unloaders, 2--1 Temperature Control, 2--1, 2--2 Temperature Pressure Chart, 4--15 Vent Mode, 2--1 Temperature Sensor, 1--5, 4--13, 4--14 Thermostatic Expansion Valve, 4--9 TROUBLESHOOTING, 3--1 Wiring Schematics, 5--1 Index 2 T--336 05/09...
- Page 42 Carrier Corporation Fax: 1- -717- -764- -2219 Transport Air Conditioning Group P.O. Box 4805 Syracuse, N.Y. 13221 U.S A www.carrier.transicold.com A member of the United Technologies Corporation family. Stock symbol UTX ©2009 Carrier Corporation D Posted in U. S. A. 0509...