Engineered air EngA CU Series, Инструкция по установке, эксплуатации и обслуживанию

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A
CU MANUAL
IOM-14 45 of 46 Feb 06 R4
TROUBLESHOOTING CHART
Symptoms Problem Cure
Compressors not
running No power Restore power to unit.
Blown Fuse or breaker Replace fuse or reset breaker
Low voltage Find and correct reason for low voltage
Faulty control system Check and repair as required
Open safety contacts Check safety controls and identify and correct
problems
Ambient temperature below
design Check low ambient control and adjust as necessary
Open control sensor Check and replace as necessary
Compressor cycles Low refrigerant charge. Unit
cycling on low-pressure
control. Find and repair leak, evacuate and recharge
Low voltage to compressor
contactor. Check voltage at contactor. Repair as required.
Control relays
chatter or solenoid
valves not
energized Voltage drop in field wiring
to solenoids or thermostat.
(greater than 10%) Check voltage at solenoid or relay when it is
energized, If it is less than 10% of rated voltage,
check wire size, or determine cause and repair as
required.
Primary voltage not within
10% of unit rating plate. Have electrician check and repair as required.
High Head Pressure Dirty Condenser Clean or wash
Flattened or hail damaged
fins Comb fins
Condenser fan motors not
running Check and correct problem
Broken condenser fan blade Replace blade
Defective or incorrectly set
condenser fan cycling
control Adjust or replace as required
Condenser air, short
circuiting Check temperature of inlet air and correct as
required. Ensure proper airflow clearances.
System overcharged with
refrigerant Reclaim excess refrigerant
Non condensables in system Reclaim refrigerant, evacuate system, recharge
with new refrigerant
Low Suction
pressure Dirty evaporator Clean or wash coil
Low refrigerant charge Find and repair leak, evacuate, and recharge
Low load or supply air flow Check air-conditioning loads and supply air
volume. Check for dirty filters, closed fire
dampers, defective VAV boxes etc.
Plugged liquid line drier Check temperature drop across drier. Replace
drier as required.