2-2
M
aintenance
P/N 2400205_J
U.S. & Canada 1-800-922-1919 • Mexico 1-800-522-1900 • www.hussmann.com
TEMPERATURE CONTROL
An adjustable thermostat is provided for the
operation of the case. The thermostat on the
SM-110 is located on the right side of the base.
For all other SM models, it is located on the
rear at the left side of the base, next to the
access panel. The thermostat has a control
screw for temperature adjustment. The com-
pressor will run 100% of the time in the full
clockwise position.
HIGH PRESSURE SWITCH
A high pressure limit switch is provided on all
spot merchandiser models. This switch is used
to limit the discharge pressure of the compressor.
The high pressure switch will automatically cycle
off the compressor and turn on a warning light
on the base, when the discharge pressure in the
system is too high. If this condition occurs, first
clean the condenser. Call for service if the warn-
ing light continues to illuminate.
REFRIGERATION
(Self Contained Models)
Each self contained model is equipped with
its own condensing unit and control panel
located beneath the display area. The correct
type of refrigerant will be stamped on each
merchandiser’s serial plate. The merchan-
diser refrigeration piping is leak tested. The
unit is charged with refrigerant, and shipped
from the factory with all service valves open.
SM models have a refrigeration system that
uses a hermetic compressor. SM systems use
a capillary tube for refrigerant control. The
capillary tube is soldered to the suction line
pull-out coil for proper heat exchange.
If the
capillary should become plugged or damaged, it
is best to replace the heat exchanger.
DEFROST
These merchandisers require manual defrost.
When defrosting is necessary, disconnect elec-
trical power to the merchandiser. Remove all
products. Remove drain plug. Attach a hose,
or use a pan before melting ice begins to drip
out of the drain.
Do not remove frost with a pick, knife or by
scraping with a sharp object. Do not allow
water to drain on the floor. When the unit is
finished defrosting, clean the inside. Install the
plug on the drain tube, and connect the unit to
the correct power supply.
Refrigeration lines are under pressure.
Refrigerant must be recovered before
attempting any connection or repair.
Thermostat
Position only for
SM-110
Case
Front
All other SM
Models
Thermostat
with control
screw
Base
Case
Back
Access Panel
