Refrigeration Thermostat; Defrost Termination Thermostat; Defrost Sequences - Hussmann Impact Excel M5X Installation And Service Manual

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EFRIGERATION

REFRIGERATION THERMOSTAT

The bulb for the optional refrigeration thermostat
is located approximately 12 in. (305 mm) above
the coil and 6 ft (1829 mm) from the left-hand
end (facing front) of the merchandiser. The
optional refrigeration thermostat is located 3
(1067 mm) from the left-hand end, just past the
raceway. On wide island models, the thermostat
body is located 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 (facing front) end of the case.
E-Plus models do not use a defrost termina-
tion thermostat and are to be time terminated
only.
Standard
Defrost
Termination
Thermostat
P/N 0463880_E
/ E
LECTRICAL

DEFROST SEQUENCES

These merchandisers require defrost cycles
for proper operation. Refer to the data sheets
for application data.
1
/ ft The Time Clock initiates defrost. The evaporator
2
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.
Optional Refrigeration
Thermostat Bulb
Time Termination
Time termination should
be used for the following
types of installations:
1. All E-Plus models;
2. Parallel systems with
thermostat and liquid
solenoid; and
3. Single compressor units
with pump-down.
To use time termination,
simply do not wire the
termination thermostat.
Optional
Refrigeration
Thermostat
. .
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