CHAPTER III - GENERAL MAINTENANCE
SECTION I NORMAL MAINTENANCE
SECTION II GENERAL SERVICING
1 - Water System
2 - Refrigeration System
3 - Noise
4 - Continuous Operation
SECTION I - NORMAL MAINTENANCE
After the water cooler is installed and operating properly,
very little maintenance is required. No oiling is
necessary on hermetic units as both compressor and fan
motor are permanently oiled. With open type belt driven
units, oiling of the motor twice a year is required.
Cleanliness of equipment is most important.
The air cooled ;condenser, located in the
machine compartment of the cooler, requires periodic
inspection. Any accumulation of lint or dust in air
passages requires removal. Dirty condensers can be
cleaned with a non-metallic brush, air hose or vacuum
Periodic cleaning of the drain or precooler is
also required. To clean, remove strainer from cabinet
top, and clean internally with a non-metallic brush.
The stainless top is easily cleaned. Metal polish
will restore luster. The side panels can
be washed and polished with a soft cloth.
CAUTION - FREEZING TEMPERATURES- To prevent
serious damage to the water cooler, all water must be
After the water supply has been turned off,
remove the remote plug, depress bubbler valve. This
will drain the tank type cooling unit. When the water
regulating valve is mounted inside of the cabinet, the
entire valve should be disconnected. This will permit the
water to drain from the "Remote" fitting.
Water coolers with the coil-on-coil type cooling
unit, can be drained by blowing the water coil with low
Water must also be drained from water cooled
condensers. Remove both inlet and outlet water
connections from water supply and blow the water coil
with low pressure air.
SECTION II - GENERAL SERVICING
Rusty pipes, sediment deposits in the water and pipe
sealing compound often create problems in the water
system of the cooler. When these conditions are
suspected, flush the water supply and install a water
strainer ahead of cooler.
Water flow blockage in the water system is first
noticable at the bubbler nozzle. For procedures to
correct this problem, see Chapter IV Section II.
Improper installation of the water cooler, by blocking the
entrance or discharge of condenser air, often creates
problems in the refrigeration system. Dirt, lint and dust
on the condenser fins can cause similar problems of
erratic compressor operation, warm outlet water, and
overload protector and/or starting relay failure on the
Restricted air flow through the condenser
causes abnormally high head pressures since heat
dissapation is reduced. This imposes a greater load on
the compressor motor and may cause the overload to
Similar conditions can arise with the water-
cooled condenser when the water flow is restricted, or
the condenser water metering valve is out of adjustment.
To test the efficiency of the condenser, check the inlet
and outlet water temperatures with
a thermometer. The temperature difference should
never be more than 250 F.
The water cooler is normally free of excessive noise.
The compressor motor assembly is suspended on four
springs within the welded steel housing. The fan motor
mounting bracket is rigidly secured. The fan blade is
mounted on the fan motor shaft with a rubber washer to
minimize noise transmission to the cooler. If the fan
blade is damaged, it should be replaced rather than
repaired or re-aligned. The compressor or fan motor
should be replaced if either develops an unusual noise.
The refrigeration system has been designed to operate
on the demands of the thermostat. If the demands of the
thermostat are not met, the unit will continue to operate.
This condition can occur if the unit has....
1 - Short in the electrical system
2 - Fused electrical contacts in the thermostat
3 - Moisture in the system
4 - Plugged refrigerant strainer
5 - Undercharge of refrigerant
6 - A broken discharge tube in the compressor.