Thermo King 098916, Руководство по обслуживанию

Страница: 161 / 196

Diagnosis: Troubleshooting, Status Messages, Alarm Codes
160
Head pressure too high Refrigerant overcharge Purge system
Air in refrigeration system Evacuate and recharge
Dirty or restricted condenser coil Clean condenser coil
Condenser fan not operating
See “Condenser Fan Motor Does Not
Operate” under “Mechanical
Diagnosis”
Condenser fan grille damaged or
missing
Repair or replace grille
Condenser fan blade damaged Replace fan blade
High ambient air temperature No remedy
Restricted dehydrator or high side Replace filter drier or clear restriction
Defective service gauge Replace gauge
Compressor loses oil Refrigerant leak Repair leak and recharge
Compressor oil migrates to
system
Short cycling
See "Unit Short Cycles" under
“Mechanical Diagnosis”
Rapid cycling between Cool,
Null and Heat modes Air short cycling through evaporator Check and correct cargo load
Defective controller or main relay
board
Diagnose main relay board and
controller. Replace defective
component
Short cycling
See “Unit Short Cycles” under
“Mechanical Diagnosis”
Compressor Digital Control valve
stuck close or defective
Replace valve
Hot liquid line Shortage of refrigerant Repair or recharge
Expansion valve open too wide Adjust or replace expansion valve
Frosted liquid line Liquid line restricted Remove restriction
Restricted filter drier Replace filter drier
Frosted or sweating suction
line Expansion valve admitting excess
refrigerant Check feeler bulb and adjust
expansion valve
Evaporator coil needs defrosting
Check defrost circuit including
controller and evaporator coil sensor
Evaporator fan does not operate
See “Evaporator Fan Motor Does Not
Operate” under “Mechanical
Diagnosis”
Unit in vacuum—frost on
expansion valve only
Ice plugging expansion valve screen
or orifice
Apply hot wet cloth to expansion
valve. Moisture indicated by increase
in suction pressure. Replace filter
drier
High suction pressure Overcharge of refrigerant Purge system
Expansion valve open too much Adjust or replace valve
Defective controller or main relay
board
Diagnose main relay board and
controller. Replace defective
component
Service gauge out of calibration Adjust or replace service gauge
Condition Possible Cause Remedy