CeilAir CW series Instrukcja Operatora Pobierz pdf (Strona 47)

(©July, 2008)

CeilAiR OHS Series Installation, Operation & Maintenance Manual

ir Technology Systems, Inc.

4-3

SYMPTOM PROBABLE CAUSE RECOMMENDATION

Evaporator Coil Ices (Cont.) 2. Check for and clear any

obstructions across or in the (supply)

discharge airstream.

3. Check correct rotation of

evaporator blower.

b. Temperature setting Increase temperature

too low (68°F min.). setpoint.

c. Discharge air short cycling back Check discharge grille orientation.

to return.

d. Low refrigerant charge. Find leak, repair and recharge

system.

Blower Fails to Start a. Power failure. Check main voltage power source

input cable.

b. Control transformer circuit breaker Check for short circuit or ground

tripped. fault; if none, reset circuit breaker.

c. Defective contactor. Repair or replace.

d. Condensate switch open. 1. Ensure unit is level.

2. Check that condensate pan is

draining properly. Clear obstructions.

e. Thermal overload tripped. Reset overload and check amperage

of motor. Compare to setting on

overload and adjust to FLA. All direct-

drive motors are internally protected

and do not require overload.

Control is Erratic Wiring - improperly connected or broken. Check wiring against schematic

diagram.

Condenser Pressure a. Non-condensable gas or air in Recover system and recharge. Install

too High the system. new drier/strainer.

b. Condenser air intake is blocked. Remove debris and clean condenser.

c. Overcharge of refrigerant. Reclaim excess refrigerant from

system.

d. Low water flow to water-cooled Reset-determine cause and fix.

condenser.

e. Condenser fan not operating. Check pressure/temperature

operating switches and motor.

Replace as needed.

f. Water/glycol temperature too high. Check flow and operation of

drycooler.

g. Condenser pressure regulating Adjust to obtain correct pressure.

valve setting too high.

h. Flow of water/glycol too low. 1. Check glycol solution level and

concentration.

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