Heatcraft Refrigeration Products H-IM-79E User Manual

 
 

•  Use a minimum 18 gauge wire for all low  

 

 

voltage connections

 
 

•  The Beacon II board gets its 24 VAC power  

 

 

supply from a transformer mounted in the  

 

 

electrical end of each evaporator. On  

 

 

208-240 volt systems the multi-tap  

 

 

transformer is shipped from our factory wired 

 

 

for 240 volts. If your supply voltage is 208  

 

 

volt you must change to the 208 volt tap on 

 

 

the transformer.

 
 

 

 

NOTE: On multiple evaporators, since a 

 

 

 

transformer is in each evaporator, the  

 

 

 

voltage tap must be set on each  

 

 

 

evaporator. 

 

•  Refer to wiring schematic shipped on units  

 

 

for unit wiring. Schematics in this Installation 

 

 

& Operation Manual are typical wiring  

 

 

schematics only. 

 

•  Program ALL slave evaporators as SLAVES. 

 
 

•  Evaporators are shipped from our factory  

 

 

with a preset box setpoint temperature of  

 

 

35°F for air defrost and -10°F for electric  

 

 

defrost. If your box setpoint temperature  

 

 

requirements are different this must be set  

 

 

using directions outlined under “Room  

 

 

Temperature Control”. 

 

•    The suction line temperature sensor MUST  

 

 

be removed from the suction line before  

 

 

brazing the suction tubing. The sensor  

 

 

MUST then be reinstalled on the suction  

 

 

line after brazing is completed and the tubing  

 

 

has cooled. Insulate when finished. 

 

•    The low pressure switch time delay relay, 

 

 

located in the condensing unit, must be set  

 

 

to 1 minute. 

 

•    If electrical power will be connected prior to  

 

 

evacuation and charging of system, unplug  

 

 

electric expansion valve from board until  

 

 

system is ready to be evacuated, leak tested  

 

 

and charged.

 

•   Some systems may require the crankcase  

 

 

heater be energized 24 hours prior to  

 

 

start-up. The Beacon should be de- 

 

 

energized for this period by placing it in  

 

 

the 

SERVICE MODE. This is done by 

 

 

pressing the 

FORCE SERVICE button 

 

 

twice. To start the system cooling, press the  

 

 

CLEAR button. 

 

•    Room sensors must be left connected on  

 

 

ALL evaporators. 

 

•    A pressure transducer is installed on the  

 

 

evaporator. Do not leak test system above  

 

 

150 PSI or damage to transducer could  

 

 

occur. If leak testing must be greater than 

 

 

150 psig, disconnect the transducer from  

 

 

he suction header and reconnect after  

 

 

testing is complete.

 

 

The condensing unit control panel contains the relays, 
contactors, time delay and a terminal block which is 
appropriately marked to match the low voltage wiring 
connections. A sensor for outdoor air temperature 
measurement is installed on the condensing unit.

Condensing unit must be installed using proper 
refrigeration practices and codes. Make sure there is 
sufficient clearances around unit for adequate air flow 
and access.

The evaporator contains the Beacon II controller, electric 
expansion valve, pressure transducer, distributor, orifice, 
transformer and three sensors. These components are 
all factory mounted and wired. The three sensors are 
factory mounted and provide input to the controller from 
the following: defrost temp., suction temp., room temp.

Each evaporator unit must be installed using proper 
refrigeration practices and codes. Make sure the 
piping is correctly sized and properly routed. It is highly 
recommended that the liquid and suction lines be 
insulated. There must also be good clearance around 
unit. See Heatcraft Refrigeration Installation & Operation 
Manual for more details.