MASTER-BILT ELECTRONIC REFRIGERATION CONTROL

OPERATION

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 COMP LED indicator stays on while compressor relay is energized. Display will show actual box temperature. Figure 4 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.

Fig. 4 – Display Lay-out

Fan The fans will run constantly except when a defrost is initiated, or when the evaporator temp is above the 30oF. When in defrost mode the fan is off until the end of the defrost and the 2 minute drip time has passed. There is 4 minutes delay after a defrost before the fan comes on. The difference of the evaporator and room temperature of more than 9oF will override the fan delay. FAN LED indicator is on while FAN relay is energized.

Defrost The control uses time defrost with 4 defrost per day. A programmed “HOT-KEY” has to be used to re-set the defrost scheme for special applications. During defrost the display will show dEF and the LED indicator under DEF in on. The control begins timing the defrost when power is turned on. Four defrost per day means it will occur every 6 hours. To have defrost occur at 8am, 2pm, 8pm, and 2am then power up at one of these four times.

MANUAL DEFROST

 

1. Push this DEFROST

key for more than 2 seconds and a manual defrost will start.

2.While in defrost, Push and hold the DEFROST

the controller will end the defrost cycle. The controller minutes. The DEF led is flashing in drip mode.

HOW TO SEE THE SETPOINT (Box temperature cut-out)

key for more than 5 seconds and will then enter drip mode for 2

1.

Push and immediately release the SET key: the display will show the Set

point value;

2.Push and immediately release the SET key or wait for 5 seconds to display the probe value (actual box temperature) again.

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Master Bilt K manual MASTER-BILT Electronic Refrigeration Control Operation, Manual Defrost

K specifications

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