64
YORK INTERNATIONAL
TABLE 3
OPERATING ANALYSIS CHART
RESULTS
POSSIBLE CAUSE
REMEDY
1. SYMPTOM: ABNORMALLY HIGH DISCHARGE PRESSURE
Temperature difference between saturation
Air in condenser.
temperature and water off condenser
higher than normal.
High discharge pressure.
Condenser tubes dirty or scaled.
Clean condenser tubes.
Check water conditioning.
High condenser water temperature.
Reduce condenser water inlet temperature.
(Check cooling tower and water circulation.)
Temperature difference between condenser Insufficient condensing water flow.
Increase the quantity of water through the
water on and water off higher than normal,
condenser to proper value.
with normal cooler pressure.
2. SYMPTOM: ABNORMALLY LOW SUCTION PRESSURE
Temperature difference between leaving
Insufficient charge of refrigerant.
Check for leaks and charge refrigerant into
chilled water and refrigerant in cooler
system.
greater than normal with high discharge
temperature.
Flow orifice blocked.
Remove obstruction.
Temperature difference between leaving
Cooler tubes dirty or restricted.
Clean cooler tubes.
chilled water and refrigerant in the cooler
greater than normal with normal discharge
temperature.
Temperature of chilled water too low with
Insufficient load for system capacity.
Check prerotation vane motor operation
low engine load.
and setting of low water temperature
cutout.
3. SYMPTOM: HIGH COOLER PRESSURE
High chilled water temperature.
Prerotation vanes fail to open.
Check the prerotation vane motor
positioning circuit.
System overloaded.
Be sure the vanes are wide open
(without overloading the engine) 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 direction.
Check rotation of oil pump.
center; compressor will not start.
(Electrical Connections)
Oil pump not running.
Check electrical connecrtions to oil pump
and press manual reset on oil pump starter
in AC panel.
5. SYMPTOM: COMPRESSOR STARTS, NORMAL OIL PRESSURE DEVELOPS, FLUCTUATES FOR SHORT WHILE, THEN
COMPRESSOR STOPS ON OIL PRESSURE CUTOUT
Oil pressure normal, fluctuates, then com-
Unusual starting conditions exist, i.e., oil
Drain the oil from the compressor and
pressor stops on Oil Pressure Cutout.
foaming in reservoir and piping due to
charge new oil into the compressor. (Refer
Display reading:
lowered system pressure.
to Charging the System With Oil, page 61.)
Burned out oil heater.
Replace oil heater.
LOW OIL PRESSURE
