26
M
INI
-S
PACE
EC I
NSTALLATION
, O
PERATION
AND
M
AINTENANCE
M
ANUAL
SYMPTOM
PROBABLE CAUSE
RECOMMENDATION
Condenser Pressure Too High
a. Non-condensable gas or air in system.
Recover system and recharge. Replace
drier/strainer. Evacuate to 50 microns and
recharge.
b. Condenser air intake is blocked.
Remove debris and clean condenser.
c. Overcharge of refrigerant.
Reclaim excess refrigerant from system.
d. Low water fl ow to water-cooled con-
denser.
Reset-determine cause and fi x.
e. Condenser fan not operating.
Check pressure/temperature operating
switches and motor. Replace as needed.
f. Water/glycol temperature too high.
Check fl ow and operation of drycooler.
g. Condenser pressure regulating valve set-
ting too high.
Adjust to obtain correct pressure.
h. Flow of water/glycol too low.
1. Check glycol solution level and concentra-
tion.
2. Valves not open or partially open. Repair/
replace as needed.
3. Air in system - bleed system.
4. Check all strainers and clean if needed.
i. Water/glycol solution not mixed prior to
adding to system.
Remove solution and premix. Refi ll system.
Condenser Pressure Too Low
a. Loss of refrigerant (indicated by bubbles
in sight glass).
Locate and repair leak. Recharge system.
b. Condenser fan controls not set
Adjust or repair controls properly.
Adjust or repair controls.
c. Water regulating valve adjusted
too low.
R410A - Readjust to 440 psig.
Noisy Compressor
a. Expansion valve stuck in open position
(abnormally cold suction line).
Ensure feeder bulb is tight on suction
line. Check operation and superheat.
b. Worn or scarred compressor bear-
ings.
Replace compressor.
c. Liquid slugging.
System overcharged. Reclaim excess
refrigerant.
d. Scroll compressor not properly phased.
Phase correctly at main power source. Do
not rewire compressor.
Compressor Fails to Start
a. Temperature setpoint too high.
Adjust to desired temperature.
b. Compressor internal overload protector
is open.
Check compressor for short circuit or
ground.
c. Complete loss of refrigerant charge (low
pressure safety switch).
Locate and repair leak. Recharge system.
d. Condenser pressure too high (high pres-
sure safety switch).
Check condenser for obstructions.
e. Minimum off time has not expired.
Wait for time to expire.
