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Howard-McCray A Division of HMC Enterprises, LLC.
831 East Cayuga Street • Philadelphia, PA 19124 USA • (215) 464-6800 • (800) 344-8222
Fax (215) 969-4890 • E-Mail: [email protected] 101018
5
Defrost
These freezer models utilize an electric defrost
system. This sytem is self-initiating/self-
terminating and consists of the following
components:
• A Time Clock to initiate the defrost cycle,
terminate the cooling cycle and stop the
evaporator fans.
• A Defrost Heater that heats the evaporator
coil to remove the accumulated frost and ice.
• A Drain Pan Heater to warm the drain pan to
allow the condensate water to drain out of the
cabinet.
• A Defrost Termination Control to signal the
end of the Defrost cycle.
Defrost Time Clock
The time clock supplied with this cabinet is a time
initiated, signal terminated timer, with a fail-safe
time-out feature. The timer is located in the
machine compartment of the cabinet. Under
normal operating conditions, one (1) to three (3)
defrost periods per day should be satisfactory.
The recommended fail-safe setting is 20 minutes.
The evaporator fans will not operate during the
defrost period.
Timer Adjustment Instructions
To set the number of defrost periods: Four pins
are furnished with each timer. These pins can be
screwed into the outer (24 hour) dial of the timer
at the hours when defrost is desired.
To set the time of day: Grasp the knob in the
center of the inner (2 hour) dial and rotate in a
counter-clock-wise direction. This will revolve the
outer dial to align with the pointer. Use the outer
dial for the hour and the inner dial for the minutes.
Note: Do Not try to set the time control by
grasping the outer dial. Rotate the inner dial only.
To set the fail-safe cycle length: Push down the
copper pointer on the inner (2 hour) dial and
rotate to the desired time. The numbers on the
dial are in minutes.
Defrost Heater
The defrost heater is pressed into the underside
of the evaporator coil fins. The heat from the
heater rises into the evaporator and melts the
frost and ice that has accumulated on the coil.
To check if the defrost heater is operating
properly first verify that it recieving the proper
voltage with a voltmeter. Use an ammeter to
check for the proper current draw of the heater.
The amps for the heaters are as follows:
• SF22: 5.2A @ 115V
• SF48: 9.5A @ 115V
• SF22: 4.8A @ 230V
Drain Pan Heater
The drain pan heater is attached to the drain pan
with aluminum tabs. The drain pan heater warms
the drain pan so that the consensate water from
the evaporator coil will not freeze to the pan, and
will drain freely out of the cabinet.
To check if the defrost heater is operating
properly first verify that it recieving the proper
voltage with a voltmeter. Use an ammeter to
check for the proper current draw of the heater.
The amps for the heaters are as follows:
• SF22: 3.5A @ 115V
• SF48: 3.5A @ 115V
• SF22: 1.7A @ 230V
Defrost Termination Control
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