Heatcraft Refrigeration Products H-IM-82B Manual De Usuario

Reprinted with permission from Dixell.

Air defrost units are preprogrammed for 3 hours of 

compressor run time between defrosts. These periods are 

not reprogrammable. After 3 hours, the temperature control 

will turn the compressor off. When the coil temperature 

reaches 38°F, the control will terminate the defrost cycle. 

• Approximate dial settings of control 
  0 = Unit off (not an electrical disconnect)

  1 = 52°F (11°C)

  2 = 49°F (9°C)

  3 = 45°F (7°C)

  4 = 41°F (5°C)

  5 = 38°F (3°C)

  6 = 34°F (1°C)

Cooler units utilize an electronic temperature control. 

The temperature may be adjusted by setting the dial. This 

control is preset to provide 3 hours of compressor run time 

between defrost cycles. Defrosts are temperature terminated 

and cannot be reprogrammed. The temperature control 

is programmed for minimum on cycle of one minute and 

minimum off cycle of four minutes.

The evaporator section of a 

 system should be checked 

at least once for proper defrosting because the amount 

and pattern of frosting can vary greatly. The frost build-up 

is dependent on the temperature of the room, the type of 

product being stored, how often new product is brought 

into the room and percentage of time the door to the room 

is open.

After first year of operation and under normal usage, 

maintenance should cover the following items at least once 

every six months:
  1.  Check and Tighten ALL electrical connections.
  2.  Check all wiring and insulators.
  3.  Check contactors for proper operation and for worn  

    contact points.
  4.  Check all fan motors. Tighten motor mount bolts/nuts  

    and tighten fan set screws.
  5.  Clean the condenser coil surface.
  6.  Check the operation of the control system. Make  

    certain all safety controls are operating properly.
  7.  Check that all defrost controls are functioning properly.
  8.  Clean the evaporator coil surface.
  9.  Clean the drain pan and check the drain pan and  

    drain line for proper drainage.

NOTE:  If power is interrupted to the unit during the 

refrigeration off-cycle (system at temperature setpoint, 

compressor off), the thermostat will initiate an extra defrost 

period approximately one hour after power is restored.