Heatcraft Refrigeration Products H-IM-79E 用户手册

At the initial application of power to the system, the 
compressor and the evaporator fans will be in a 4 minute 
hold-off cycle and will not start immediately. When there 
is a call for 

COOLING, the expansion valve (EEV) opens, 

then the compressor is started. The compressor will 
then run for a minimum of 2 minutes in the “hold-on” 
cycle. (This means that the compressor will run for a 
minimum of 2 minutes before shutting off even if the box 
temperature is met). 
 
The LED alternately displays 

BOX TEMPERATURE 

and 

MODE of operation. On a call for cooling, dLY will 

show while the expansion valve is opening. After the 
compressor starts the LED will alternately display 

TEMPERATURE and Coo. 

On multiple evaporator systems the MASTER evaporator 
will display 

BOX TEMPERATURE and Coo. The SLAVE 

evaporators will display 

Coo only.

When the room thermostat setting is satisfied, and if 
the compressor ran for at least 2 minutes, the EEV will 
close and the compressor will pumpdown and shut off. 
The evaporator fans will continue to run. The LED will 
alternately display 

oFF and BOX TEMPERATURE.

When the room sensor detects a rise in temperature of 
approximately 2°F, and the compressor has been off for 
at least 4 minutes, the EEV will open to its last position 
then the compressor will start. The valve is then adjusted 
as necessary to obtain the setpoint superheat setting. 
During this time, the compressor will run for a minimum 
2 minutes “hold-on” cycle.

The four minute “

HOLD-OFF” can be bypassed and the 

system started immediately by pressing the “

RESET” 

button on the Beacon II board.

oFF   - Off

Coo   - Cooling

Pdn   - Pumpdown

dEF   - Defrost

drn    - Draining

dLY  - Delay

tSt   - Test

SEr   - Service