VI.
MAINTENANCE
A. Bubbler - If the bubbler flow rate becomes restricted, shut off water supply, unscrew the bubbler and
clean the mesh strainer (See Illustration Page).
B. Thermostat - The thermostat is accessible by removing the front panel and is located on the under
side of the compartment shelf. Should malfunctioning of the thermostat be suspected, first check position of
control and make sure there is sufficient current and voltage to the cooler. If the contacts are open and the water
Is warm, the bellow has lost its gas charge. Replace with a thermostat of the same character. If the contact
points are "stuck" closed, make inspection to see If points are burned. If the inspection reveals the points to be
burned, the thermostat should be replaced.
Incorrect voltage (voltage that deviates from the standard more than 10) will cause this trouble. The
thermostat is factory-set; however, if an adjustment becomes necessary, follow instructions shown. (See
Illustration Page.)
C. Overload - There is an overload protector located Inside the terminal cover of the hermetic
compressor. This overload will cause the unit to "short-cycle" or "click" if any of the following conditions are
present: 1) The condenser Is dirty. 2) The fan will not run. 3) The voltage is too high or too low. Correct the fault
and If the unit still falls to operate, replace the overload and relay with new ones of the proper characteristics.
Should the unit fail to run, recheck all the electric wiring and check the compressor for shorts.
To check the hermetic compressor for shorts, pull out the cooler plug and with an Ohm Meter.
Wheatstone Bridge, or a Resistant Meter, check between each terminal of the hermetic compressor and the
hermetic compressor shell. If a short is found, the hermetic compressor must be replaced.
D. Lubrication - Hermetically-sealed motor and compressor units, as well as fan motors, are permanently
lubricated and require no further attention. Open type units (belt-driven compressors) should have all bearings
checked at least twice a year. This should be done by a competent refrigeration serviceman
E. Care of Exterior - It is recommended, for sanitary reasons, that the cooler top and cabinet be cleaned
regularly with a mild cleaning agent.
F. Storage of Cooler - If location of cooler is such that it is subjected to freezing temperatures, care
should be taken to completely drain the drinking water storage chamber. Water-cooled models must also have
the water condenser coils completely drained.
VII.
COOLERS WITH A WATER COOLED CONDENSER MEDIUM
A. There is a condenser water valve provided on all water cooled models. The valve is electrically
operated and meters the correct amount of water to the condenser only when the hermetic compressor is running.
B. The valve has a removable screen that should be cleaned at least twice a year (See Illustration Page).
The flow rate is factory set and not adjustable.
C. All models other than those which operate on 115 volts 60 Hz. have a condenser water valve that
supplied water to the condenser in proportion to the refrigerant head pressure. This valve can be adjusted (See
Illustration Page), but operates automatically and shuts off the water in the condenser when the water cooler is
not running.
Ill.
FREEZEPROOF PROTECTION
When an anti-freeze thermostat is used as a means to prevent freezing of water in the cooling unit, no
attempt should be made to change its setting. If an inspection reveals the thermostat inoperative, it should be
replaced.
PMX-217-R2
12/74
