Troubleshooting
Table 1: Operation analysis chart
Results
Possible cause
Remedy
1. Symptom: Abnormally high discharge pressure
Temperature difference between condensing temperature
and water off condenser higher than normal.
Air in condenser.
Condenser tubes
dirty or scaled.
Clean condenser
tubes.
Check water
conditioning.
High discharge pressure.
High condenser
water
temperature.
Reduce
condenser
water inlet
temperature.
(Check cooling
tower and water
circulation.)
Temperature difference between condenser water on and
water off higher than normal, with normal evaporator
pressure.
Insufficient
condensing water
flow.
Increase the
quantity of water
through the
condenser to
correct value.
2. Symptom: Abnormally low suction pressure
Insufficient charge
of refrigerant.
Check for leaks
and charge
refrigerant into
system.
Temperature difference between leaving chilled water and
refrigerant in evaporator greater than normal with high
discharge temperature.
Variable orifice
problem.
Remove
obstruction.
Temperature difference between leaving chilled water and
refrigerant in the evaporator greater than normal with
normal discharge temperature.
Evaporator tubes
dirty or restricted.
Clean evaporator
tubes.
Temperature of chilled water too low with with low motor
amperes.
Insufficient
load for system
capacity.
Check pre-
rotation vane
motor operation
and setting
of low water
temperature
cutout.
3. Symptom: High evaporator pressure
Model YK Style G R-134a or R-513A
28
