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P/N 428668A
REFRIGERATION THERMOSTAT
The bulb for the optional refrigeration thermostat
is located in the discharge air of the evaporator.
The optional refrigeration thermostat is located
5 ft (1524 mm) from the left-hand end, just past
the raceway, on the serial plate side (front) of the
merchandiser.
DEFROST TERMINATION THERMOSTAT
The standard disc type defrost termination
thermostat is not adjustable. This thermostat is
clamped to the suction line of the coil on the
left-hand end of the serial plate side (front) of the
merchandiser.
DEFROST SEQUENCES
These merchandisers require defrost cycles for
proper operation. Refer to the data sheets for appli-
cation data.
Rear
Termination Thermostat
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 (Printed in U.S.A.)
(1829 mm)
Standard Defrost
The Time Clock initiates defrost. The evaporator
fans continue to circulate air across the evaporator
coil, melting any frost build-up. Defrost can be
terminated by either temperature or time.
Temperature Termination
Temperature termination should be used for the
following types of installations:
1. Parallel systems with EPRs or suction stop
solenoids
2. Single compressor units without pump-down
cycle.
Time Termination
Should be used for the following types of instal-
lations:
1. Parallel systems with thermostat and liquid
solenoid.
2. Single compressor units with pump-down.
To use time termination, simply do not wire the
termination thermostat.
6 ft
5 ft
(1524 mm)
Front
Optional
Refrigeration
Thermostat
Medium Temperature
2-3
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