Johnson Controls YORK YK Style G OPTIVIEW User Manual

JOHNSON CONTROLS
25
FORM 160.75-O1 (211)
SECTION 5 - TROUBLESHOOTING
5
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.
High discharge pressure.
Condenser tubes dirty or scaled.
Clean condenser tubes. Check water
conditioning.
High condenser water temperature.
Reduce condenser water inlet tempera-
ture. (Check cooling tower and water
circulation.)
Temperature difference between con-
denser water on and water off higher
than normal, with normal evaporator
pressure.
Insufcient condensing water ow.
Increase the quantity of water through
the condenser to proper value.
2. SYMPTOM: ABNORMALLY LOW SUCTION PRESSURE
Temperature difference between leaving
chilled water and refrigerant in evapo-
rator greater than normal with high
discharge temperature.
Insufcient charge of refrigerant.
Check for leaks and charge refrigerant
into system.
Variable orice problem. Remove obstruction.
Temperature difference between leav-
ing 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.
Insufcient load for system capacity.
Check prerotation vane motor operation
and setting of low water temperature
cutout.
3. SYMPTOM: HIGH EVAPORATOR PRESSURE
High chilled water temperature.
Prerotation vanes fail to open.
Check the prerotation vane motor posi-
tioning circuit.
System overload.
Be sure the vanes are wide open (with-
out overloading the motor) until the load
decreases.
4. SYMPTOM: NO OIL PRESSURE WHEN SYSTEM START BUTTON PUSHED
Low oil pressure displayed on control
center; compressor will not start.
Oil pump running in wrong direction.
Check rotation of oil pump (Electrical
Connections).
Oil pump not running.
Troubleshoot electrical problem with oil
pump VSD.
5. SYMPTOM: UNUSUALLY HIGH OIL PRESSURE DEVELOPS WHEN OIL PUMP RUNS
Unusually high oil pressure is dis-
played when the oil pressure display
key is pressed when the oil pump is
running.
High oil pressure. Transducer defec-
tive.
Replace low or high oil pressure trans-
ducer.

Johnson Controls YORK YK Style G OPTIVIEW Specifications

General

Brand	Johnson Controls
Model	YORK YK Style G OPTIVIEW
Category	Chiller
Language	English