TENNEY ENVIRONMENTAL
IN
CASE
OF
TROUBLE
1-
Tenney chambers have conductors carrying dangerous voltages with heavy current carrying
capacity. Be careful when trouble-shooting.
Circuit breaker
1CB opens the circuit to some of the controls. However, many power circuits
remain hot and are dangerous unless a main disconnect switch is opened or the chamber is
disconnected. Do not take chances. Before working on a machine, open the main disconnect
switch and label it with a red tag saying "DANGER -DO NOT CLOSE
THIS SWITCH",
Othewise, unplug or disconnect the chamber.
Our refrigeration systems are sealed and require little service. if you suspect a malfunction,
write or call Tenney's Service Department. Unless you are an expert in the refrigeration art, do
not tamper. Insufficient cooling, increasing vibration, compressor overheating and constant
compressor over loading are signs of trouble.
But note: This Tenney facility is designed to operate with the compressor locked on
continuously whenever the cooling mode is selected. Do not be
alamled about the
compressor running for long periods.
Before writing or phoning Tenney, inspect the system superficially: Be sure the condenser is
getting plenty of water or air. Make certain the cooling coils are defrosted and that power
supply voltage is nominal when all systems are operating. Adequate voltage is important.
Should you have to contact Tenney about your refrigeration system, please jot down all the
,
.
numbers on the compressor identification plate. Also, give us the serial number of the
chamber. This
will
help us give you fast service on spare parts.
Before trouble-shooting the control system, get a copy of the electrical schematic. It is
included with these instructions. Open or short circuits, inoperative relays, blown fuses or open
fail safe devices are most common malfunctions. When trouble-shooting, carefully trace one
system at a time. Be systematic. Use a trouble light,
buzzer or voltmeter. Do not carelessly
tinker on a circuit or system out of adjustment only to find the trouble somewhere else: Then
you will have double trouble to repair and the job will be twice as difficult. Use the
XI scale on
an ohmmeterwhen checking circuit continuity. Do not use
X10, XI00 or higher or you may
get false readings.
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