Trouble Shooting; Competent Persons Trouble Shooting Guide - York YGWH 115 Installation, Commissioning & Operation

8.

Trouble Shooting

Competent Persons Trouble Shooting Guide

PROBLEM
Transducer reads incorrectly.
Chilled water temperature sensor defective. Check temperature sensor.
Insufficient refrigerant charge.
Low evaporator water flow.
Low Evaporator
Liquid line filter clog.
Pressure
Feed or flow valve defective.
Evaporator tubes dirty or restricted.
EEV failure or fail to open.
Insufficient load for system capacity.
Oil heater failure.
Oil level switch failure.
Condenser water temperature low.
Low Oil Level
Oil filter clog.
Refrigerant over charged.
Eductor failure or oil filter clog,
insufficient oil charge.
High condenser water temperature.
Discharge transducer is defective.
High pressure switch is defective.
High Discharge
Pressure
Condenser water dirty.
Non condensable gas in the chiller.
Condenser water flow low.
Refrigerant over charged.
Electric supply to the panel is missing.
No Display on
Line fuse is blown.
Control Panel.
Control board is defective.
Unit Will NOT Run
Display board is defective.
Leaving chilled liquid temperature drops
faster than the unit can unload.
Low Leaving Chilled
Liquid Temperature
Chilled water sensor is defective.
Discharge temperature sensor is defective. Check sensor.
Condenser tubes are dirty or scaled.
High Discharge
Condenser water flow low.
Temperature
Condenser water too warm.
EN
POSSIBLE CAUSES
Form 6S6I-B01C-EOMA-EN (0318)
ACTION
Check transducer against a gauge.
Check for leaks and charge refrigerant into system.
Check flow.
Check liquid line filter.
Repair or replace valve or control.
Clean evaporator tubes.
Check EEV or EEV drive.
Check low water temperature cutout setting and low
evaporator pressure cutout setting.
Check oil heater.
Check oil level switch.
Adjust condenser water flow, increase condenser
leaving water temperature.
Check oil filter.
Recover refrigerant and keep discharge superheat in 7
to 10°C, evaporator small temperature in 0.5 to 2.5°C.
Repair or replace Eductor or filter.
Increasing oil charge.
Check sensor.
Check and clean tubes. Check water conditioning.
Check site pumps, valves, and strainers. Increase
quantity of water through the condenser to the proper
value.
Check tower fan motor/blade, valve, and water
circulation.
Vent air from the condenser gas.
Check the condenser water flow and distribution.
Recover refrigerant and keep discharge superheat in 7
to 10°C, evaporator small temperature in 0.5 to 2.5°C.
High voltage to the chiller is missing.
Check fuses.
Replace control board.
Replace display board.
Check for restricted flow.
Check for rapid flow changes.
Water loop is too small.
Flow is below minimum for chiller.
Check sensor against temperature gauge
in water line.
Check sensor for intermittent operation.
Check wiring for short or open circuits.
Check and clean tubes. Check water conditioning.
Check site pumps, valves, and strainers. Increase
quantity of water through the condenser to the proper
value.
Check tower fan motor/blade, valve, and
water circulation.
8-1