Lennox ECOLOGIC Series User Manual

Installation - Operation - Maintenance manual (IOM) • AIR COOLED CHILLERS & SPLIT UNITS - 0105-E • 37 •
TROUBLESHOOTING - REPAIRS
8.1 LIST OF THE MOST COMMON PROBLEMS - continued
PROBLEMS – SYMPTOMS PROBABLE CAUSE RECOMMENDED ACTION
J) THE COMPRESSOR IS NOISY
- If starting on a single winding on
compressors fitted with part
winding start or wye-delta
- Check operation of the starter
contacts, the start up time delay
and the condition of the windings
- Compressor knocking - Broken mechanical parts inside
compressor
- Replace the compressor
a) Liquid slugging a) Check superheat and that the
expansion valve bulb is correctly
installed
b) Expansion valve blocked in
open position
b) Repair or replace
- Suction line is unusually cold
- Broken suction valves - Replace broken valves
- High discharge pressure. The
water regulating valve or the
pressure operated water valve
taps or knocks
- Pressure operated water valve
fouled, water pressure is to high
or irregular
- Clean the valve. Install and
expansion tank upstream of the
valve
- Compressor shuts down through
action of the oil pressure safety
switch
- Low oil charge - Add oil
K) DISCHARGE PRESSURE TOO HIGH
- Water is far too hot at condenser
outlet
- Water flow to low or water
temperature too high in the
condenser
- Adjust the pressure operated
water valve or the thermostat on
the cooling tower
- Water is far too cold at the
condenser outlet
- Condenser tubes fouled - Clean the tubes
- Condenser abnormally hot - Presence of air or
incondensibles in the circuit, or
excessive refrigerant charge
- Purge incondensibles and/or air,
and recover excess refrigerant
- Chilled water leaving
temperature too high
- Excessive cooling load - Reduce load, reduce water flow
if necessary
L) DISCHARGE PRESSURE IS TOO LOW
- Water is very cold at condenser
outlet
- Condenser water flow too high
or water temperature is too low
- Adjust the pressure operated
water valve or the thermostat on
the cooling tower
- Bubbles in sightglass - Low refrigerant charge - Repair the leak and add
refrigerant

Lennox ECOLOGIC Series Specifications

General

Brand	Lennox
Model	ECOLOGIC Series
Category	Chiller
Language	English