Heatcraft Refrigeration Products BEACON II H-IM-79E, Installation And Operation Manual

4

Installation Tips

•  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.

Installation

•   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.

Condensing Unit

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.

Evaporator Unit 

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.