Refrigeration; Evaporator Fan Motors - Hussmann SHM-4 Installation And Service Instructions Manual

To replace the thermometer, remove the two screws holding the thermometer to its
mounting bracket. Remove the sensing element from its clip. Install the
replacement thermometer in reverse order.
To clean the sensing element of the thermometer, follow replacement
procedure. Clean the element with a water and mild detergent solution. Make sure
the sensing element is wiped clean of any residue to ensure proper temperature
readings
REFRIGERATION –
The SHM 3, 4, 6 models use a R-134a refrigerant and the SHM-5 and –8
models use R-404A refrigerant. All models use a hermetic compressor.
The systems employ capillary tubes for refrigerant flow control. The
capillary tube is soldered to the suction line pull-out coil for proper heat exchange.
If the capillary should be come plugged or damaged for some reason IT IS BEST
TO REPLACE THE WHOLE HEAT EXCHANGER WITH A NEW ONE.
Consult the factory for the proper replacement.
Listed below are BTU requirements for the SHM series cabinets at a +20º F
evaporator and 110º F condenser temperature.
SHM-3
SHM-4
SHM-5
SHM-6
SHM-8
The following pressures are optimum when the case is in a 75º to 80ºF ambient and
is running from 35º to 40ºF cabinet temperature and are for reference only:
Head Pressure
Suction Pressure
Consult the serial plate for the correct refrigerant charge. This charge is critical
and should be weighed in.
EVAPORATOR FAN MOTORS –
To replace an evaporator fan motor, the product must be removed from the
cabinet and the step shelves also removed. The shelves are only set in place.
Next, remove the plate covering the fans by removing the two screws holding
this in place. The fans are now accessible.
2900
3000
4400
5400
6400
SHM-3,4,6
110-120 psig
15-20 psig
Page 9
SHM-5 –8
Head Pressure 280-290 psig
Suction Pressure 36-40 psig