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MASTER-BILT ELECTRONIC REFRIGERATION CONTROL
Display Lay-out
Compressor
When power is first turned on to the control, the LED indicator under COMP on the display starts
blinking. After one-minute delay the compressor comes on. The LED indicator stays on while compressor relay is
energized. Display will show actual box temperature. Picture above is the display layout. The compressor will be
cycled off when the actual box temperature reaches its set point. The COMP indicator will be off.
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Fan
The fans will run constantly during cool mode and defrost mode, or when the evaporator temp is above 55
F.
FAN LED indicator is on while FAN relay is energized.
Defrost
The control uses time defrost with 6 defrost per day. The defrost scheme can be re-set the for special
applications. During defrost the display will show dEF and the defrost LED indicator on. The control begins timing the
defrost when power is turned on. Four defrost per day means it will occur every 4 hours.
MANUAL DEFROST
Defrosting my also be induced manually by keeping the defrost button for 3 seconds. Once defrost has started, the
defrost will go through a defrost and drip time pull down cycle.
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