Heatcraft Refrigeration Products H-IM-79E Manual De Usuario

Air Defrost fan motors must be wired through the fan 
relay on the Beacon II board for this to be effective on Air 
Defrost systems. The entire system will be shut off and 
remain off until the SPST switch is opened.

Air Defrost evaporator fans are setup to run constantly. 
If there is a need to shut down the evaporator fans on 
an Air Defrost system, this can be accomplished by 
wiring the evaporator fan motor or evaporator fan motor 
contactor through the fan relay on the Beacon II board. 
When this is done and the Air Defrost system  
is placed in “

SERVICE,” the evaporator fans 

will shut off when the system is in pumpdown.

  E1 -  Room temperature sensor shorted,  
      open or not installed 
  E2 -  Defrost temperature sensor shorted,  
      open or not installed 
  E3 -  Suction temperature sensor shorted,  
      open or not installed 
  E4 -  Suction pressure transducer shorted,  
      open or not installed 
  E5 -  Outdoor temperature sensor shorted 
  E6 -  Low superheat 
  E7 -  Compressor shut down  
      (high or low pressure switch open or  
      oil pressure switch open)  
  E9 -  Multi-in/multi-out wiring error

 

At initial power up, each Beacon II board checks for 
system errors. The system error check involves checking 
the various temperature sensors to determine whether 
any of these sensors are shorted or open. 

The system will pumpdown and cycle off and 

restart until the fault is cleared or the circuit breaker 

reset, for the following conditions: 

 

- 

Suction sensor shorted, open  

 

 

or not installed 

 

-   Room temperature sensor shorted  

 

 

or not installed 

 

-   Pressure Transducer open  

 

 

or not installed  

The system will pumpdown, cycle off and 

for these faults. Each try will be after the 4 minutes 

“Hold Off” period, for the following fault conditions: 
 

 

 

- High pressure or low pressure cutout 

 

- Oil pressure

After the fourth try, the Alarm contacts will be closed 
and an alarm message displayed on the LED. To clear 
this condition, the system should be cycled through the 

“SERVICE MODE” after the correction is completed.

In some installations, it is desirable to shut off the 
evaporator fans periodically. This is easily accomplished 
on Beacon II by wiring a single pole, single throw switch 
(SPST) between the terminals marked “

SERVICE” and 

“

COM” on the Beacon II board. Closing this switch will 

cause the system to pumpdown and shut off.