Ccu Air Conditioning - Carrier ComfortPro PC6000 Operation & Service Manual

3.4 CCU AIR CONDITIONING

SYMPTOM
Does not produce
cold air
Produces cold air and
gradually stops
Tripped high
pressure switch
Tripped on EVAP
temp sensor
3-8
Each symptom is followed by a probable cause and suggested solution. To isolate the
possible cause, proceed in a systematic manner to determine the faulty component. This
guide does not cover all possible situations that may occur under all conditions of operation.
NOTE: The five minute timer is activated any time the compressor is turned off (by the
thermostat, EVAP temp sensor or high pressure switch. It is used to let the pressure
between the high and the low side equalize so that the compressor can start under a
"no load" condition.
PROBABLE CAUSE
• Refrigerant leaked out
• Compressor not working
• Inlet filter clogged
• Evaporator blocked with ice
• Low refrigerant charge
• Air Duct blocked
• Condenser fan not working
• Condenser is dirty
• Poor air flow around condenser
• Refrigerant is over charged
• Evaporator blocked with ice
• Low refrigerant charge
• EVAP temp sensor faulty
Disconnect the batteries from the
APU before performing any repairs.
SOLUTION
• Check for leaks and repair
• Check voltage at compressor
• Clean filter
• Increase air flow, increase return air
• Check for leaks and repair
• Check and remove any blockage
• See "Condenser fan not working"
• Clean
• Check condenser location, relocate
if necessary
• Reduce charge to 64–68 oz
• Increase air flow, increase return air
• Check for leaks and repair
• Verify sensor operation by using
Temperature vs. Resistance Chart
62-11175 COMFORTPRO SERVICE MANUAL
WARNING
REFERENCE
• 2-3
• A-3
• 2-1
• 3-9
• 2-1
• 2-1
• 2-3