Heatcraft Refrigeration Products H-IM-79B 사용자 설명서

At initial power up, each Beacon 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 

 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 

. Each

try will be after the 4 minutes “Hold Off” period, for the following fault conditions:

- Superheat too low
- High pressure or low pressure cutout
- Oil pressure

After the third try, the system will shut down and not try to restart. The Alarm contacts will
be closed and an alarm message displayed on the LED.

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

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. 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.