TechPlus ComfortAire

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Technical Communications

TechPlus Supplement

for

Comfort Aire

School Bus Air Conditioning Systems

BLue BIrd All American Forward Engine

Blue Bird All American Rear Engine

Blue Bird Vision

Blue Bird MicroBird

Main Page

Default Chapter8
- Table of Contents8
Safety Precautions11
- General Practices11
  - Refrigerant12
  - First Aid12
- Refrigeration Oil12
Electrical Hazards13
- High Voltage13
  - Precautions13
  - First Aid13
- Low Voltage14
Comfort Aire Specifications15
- General15
- R-134A Refrigeration System Charges and Set-Points15
- A3RE/FE & BBCV with TM-21'S Electrical System16
- Micro Bird Electrical System16
Maintenance Inspection Schedule17
- General Unit Description18
- General Unit Operation19
General System Component Details20
- Stacked Skirt Mounted Condenser Configuration20
- Stacked Skirt Mounted Condenser Exploded View21
- 55,000 Bth/Hr Free Blow Evaporator Configuration22
- 55,000 Btu/Hr Free Blow Evaporator Exploded View23
- Typical TM-21 Compressor24
- Manual Control Panel24
- High Pressure Binary Switch25
- Electronic Thermostat25
Driver Instructions and Information26
- Starting the Unit26
- Bi Monthly Post Trip Checks27
- Regular Maintenance by Driver27
- Basic Trouble Shooting for Driver27
Technician Instructions and Information29
- Charging the Air Conditioning System29
- Checking the Refrigerant Charge30
- Checking the Compressor Oil Charge30
- High Pressure Binary Switch30
Clean up Procedures32
Part Replacement Procedures34
- Compressor34
- Condenser Coil35
- Receiver Drier35
- High Pressure Binary Switch36
- Evaporator Coil36
- Expansion Valve Assembly37
Structural Maintenance39
- Unit Inspection39
Tm-21 & Tm-16 Compressor and Clutch Maintenance40
- Operation40
- Inspection40
- Clutch Removal41
- Clutch Installation43
- Electrical Connection46
- Compressor Front Seal Removal and Installation46
System Compressor and Oil Handling51
- Installation of the Compressor51
- Major Loss or Refrigerant51
- Checking the Oil Level51
- Oil Contamination52
- When a System Becomes Contaminated52
- Electrical Connection52
- Clutch Test52
Belt Tensions53
- Engine Compressor Belts and Pulleys53
- Single V-Belt - Cat C7 A3RE/FE53
- Poly V-Bel - some A3RE/FE, All BBCV and All Microbird53
General Trouble Shooting by Technician54
- Blower Motor Does Not Operate54
- Blower Motor Operates Normally, Bur Air Flow Is Insufficient54
- Insufficient Cooling, Does Not Operate at All, or Operates Improperly54
- The Compressor Does Not Operate at All, or Operates Improperly54
  - Gauge Pressure Related Troubleshooting55
  - Operation to Return Oil to the Compressor56
Electrical System Trouble Shooting57
- Compressor Trouble Shooting58
- Refrigeration Diagnosis Chart59
- System Service and Maintenance Notes60
  - Service Guidelines60
  - Compressor Oil Charge60
Refrigeration Chart62
Wiring Schematics63
- Micro Bird Manual63
- Micro Bird ECC64
- BBCV, A3RE, A3FE Manual65
- Bbcv, A3Re, A3Fe Ecc66
- Slimline System Manual67
- Slimline System ECC68
Electronic Control User Guide69
- Electronic Climate Control (ECC)70
  - ECC Control71
  - ECC User Display72
- Basic Operation73
- System Diagnosis74
System Schematics76
- A3RE ECC Roof Top Condenser77
- Engine Kit Compressor78

TechPlus ComfortAire - Page 2

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