Reach-In
P/N 0387183_V
2-7
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A.
DEFROST TERMINATION
THERMOSTAT
The standard disc type defrost termination thermostat
is not adjustable.
On low-temperature merchandisers, the defrost
termination thermostat or optional termination
sensor is located on the right end of the coil at the
bottom center return bend. If an optional adjustable
thermostat is used, the bulb will be clamped to the
suction line on the left end of the merchandiser.
CONTROL SETTINGS
MEDIUM TEMPERATURE
Conventional Single Compressor
Measure Discharge Air Temperature
at the center of the case
at the discharge honeycomb.
Merchandiser temperature must be controlled by a
thermostat or other device with a 3–6 deg F
(1.7–3.3 deg C) differential. It will be wired to
control the compressor motor contactor.
Standard Off Time defrost is time terminated. On
outdoor units the defrost timer will control a liquid
line solenoid beginning a defrost pumpdown
4 minutes before defrost.
The defrost frequency and lengths listed may require
adjustment for specific store conditions. Factors include:
Store temperature and humidity
Low head pressure
Long refrigerant line runs
Seasonal changes
Merchandiser temperature lower than
recommended
When practical, defrost when store is closed.
Low pressure control settings are applicable to
outdoor condensing units where ambient does not fall
below 0 deg F.
CONTROL SETTINGS
LOW TEMPERATURE
Conventional Single Compressor
Measure Discharge Air Temperature
at the center of the case
at the discharge honeycomb.
Merchandiser temperature must be controlled by a
thermostat or other device with a 3–6 deg F
(1.7–3.3 deg C) differential. It will be wired to
control the compressor motor contactor.
Standard Electric defrost is temperature terminated.
The defrost termination thermostats for all the
merchandisers on one compressor are wired in series.
Failsafe must not control defrost cycle length,
especially when less than 208V power supply is used
for defrost heaters, or if frost build up is heavy from
shopping demands.
On outdoor units the defrost timer will control a liq-
uid line solenoid beginning a defrost pumpdown
4 minutes before defrost.
Optional Gas defrost is time terminated and has
fan cycling thermostat. The defrost frequency and
lengths listed may require adjustment for specific store
conditions.
Factors include:
Store temperature and humidity
Low head pressure
Long refrigerant line runs
Seasonal changes
Merchandiser temperature lower than
recommended
Permit Number:
20-05195
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