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Electric Standby Mechanical Diagnosis (Rev. 1/99)
83
Head pressure too high
Refrigerant overcharge
Remove excess
Air in system
Evacuate system
Dirty condenser
Clean
Restricted condenser
Clean condenser
Condenser fan not running
Check fan motor
Condenser fan rotating backwards
Check direction
Head pressure too low
Refrigerant shortage
Repair leak and recharge
Compressor suction or discharge
valve inefficient
Replace compressor
Noisy unit
Insufficient compressor oil
Add oil to proper level
Mounting bolts loose
Tighten
Oil slugging or refrigerant flooding
back
Adjust oil level or refrigerant charge.
Check expansion valve for proper
superheat
Compressor loses oil
Shortage of refrigerant
Repair leak and recharge
Plugged expansion valve or strainer
Clean or replace
Wrong oil viscosity
Use proper oil
Short cycling
Refer to Unit Short Cycles
Superheat too high
Adjust expansion valve
Frosted or sweating suction line
Expansion valve set too low,
admitting excess refrigerant
Adjust expansion valve
Heat exchanger internal leak
Replace
Hot liquid line
Shortage of refrigerant
Repair leak and recharge
Frosted liquid line
Restricted dehydrator or strainer
Replace restricted part
Condenser coils cool when unit is
in cool
Refrigerant undercharge
Repair leak and recharge
Compressor inefficient
Replace compressor
CONDITION
POSSIBLE CAUSE
REMEDY
Содержание 914 724
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Страница 25: ...Unit Description Rev 1 99 15 1 Fan 2 Thermometer Sensor 3 Thermostat Sensor Evaporator 1 2 3 AGA358...
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Страница 107: ...97 Model 10 and 20 Schematic Diagram...
Страница 108: ...98 Model 10 Wiring Diagram...
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Страница 110: ...100 Model 20 Single Phase with Heat Option Schematic Diagram...
Страница 111: ...101 Model 20 Single Phase Wiring Diagram...