YORK INTERNATIONAL
22
FORM 160.54-O2(1102)
FORM 160.54-O2(1102)
23
YORK INTERNATIONAL
TABLE 1 –
OPERATION ANALYSIS CHART
RESULTS POSSIBLE CAUSE REMEDY
1. SYMPTOM: ABNORMALLY HIGH DISCHARGE PRESSURE
Temperature difference between conden- Air in condenser.
sing temperature and water off condenser
higher than normal.
High discharge pressure. Condenser tubes dirty or Clean condenser tubes. Check water
scaled conditioning.
High condenser water Reduce condenser water inlet
temperature. temperature. (Check cooling tower
and water circulation.)
Temperature difference between conden- Insufficient condensing Increase the quantity of water through
ser water on and water off higher than water flow. the condenser to proper value.
normal, with normal evaporator pressure.
2. SYMPTOM: ABNORMALLY LOW SUCTION PRESSURE
Temperature difference between leaving Insufficient charge of Check for leaks and charge
chilled water and refrigerant in evaporator refrigerant. refrigerant into system.
greater than normal with high discharge Variable orifice problem. Remove obstruction.
temperature.
Temperature difference between leaving Evaporator tubes dirty or Clean evaporator tubes.
chilled water and refrigerant in the evaporator restricted.
greater than normal with normal discharge
temperature.
Temperature of chilled water too low with Insufficient load for Check prerotation vane motor opera-
with low motor amperes. system capacity. tion and setting of low water temper-
ature cutout.
3. SYMPTOM: HIGH EVAPORATOR PRESSURE
High chilled water temperature. Prerotation vanes fail to Check the prerotation vane motor
open. positioning circuit.
System overload. Be sure the vanes are wide open
(without overloading the motor) until
the load decreases.
4. SYMPTOM: NO OIL PRESSURE WHEN SYSTEM START BUTTON PUSHED
Low oil pressure displayed on control Oil pump running in wrong Check rotation of oil pump
center; compressor will not start. direction. (Electrical Connections).
Oil pump not running. Troubleshoot electrical problem
with oil pump VSD.
SECTION 5 – TROUBLESHOOTING
5
