Carrier VECTOR 1550 Series - REFRIGERATION

62-61753-21
10-6
INDICATION/
TROUBLE
POSSIBLE CAUSES
REFERENCE
SECTION
10.4 REFRIGERATION
10.4.1 Unit Will Not Cool
Compressor malfunction
Compressor contactor defective
Check
Compressor defective
8.6.1
Refrigeration system
A defrost cycle did not terminate
9.4.6
Abnormal pressure
9.4.7
10.4.2 Unit Runs But Has Insufficient Cooling
Compressor
Compressor defective
8.6.1
Refrigeration system
Abnormal pressure
9.4.7
Unloader valve malfunction
8.6.9
Expansion valve malfunction
9.4.11
No or restricted evaporator airflow
9.4.10
Suction Modulation Valve malfunction
8.6.7
Economizer system malfunction
9.4.13
10.4.3 Unit Operates Long Or Continuously In Cooling
Trailer
Hot Load
Allow time to
pull down
Defective box insulation or air leak
Correct
Refrigeration system
Abnormal pressure
9.4.7
Temperature controller malfunction
9.4.9
Compressor
Defective
8.6.1
10.4.4 Unit Will Not Heat Or Has Insufficient Heating
Unit will not heat or has insuffi-
cient heat
Evaporator fan internal motor protector open
8.7.2
Heat relay defective
Check
Heater(s) defective
8.7.1
Heater contactor or coil defective
Replace
Evaporator fan motor(s) defective or rotating backwards
8.7.2
Evaporator fan motor contactor defective
Replace
Controller malfunction
9.4.9
Defective wiring
Replace
Loose terminal connections
Tighten
Low voltage
9.3
10.4.5 Unit Will Not Terminate Heating
Unit fails to stop heating
Controller improperly set
Reset
Controller malfunction
9.4.9
Heater termination thermostat remains closed along with
the heat relay
Repair