Heatcraft Refrigeration Products BEACON II H-IM-79E - Manual (Page 3)

3
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.
• There are built-in ground connections on the
Beacon II’s four corner brass spacers. Use four
sheet-metal screws to mount the board on the
Installation
evaporator for common-mode noise filtering.
Make sure that the evaporator ground terminal
is earth grounded.
• 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 may be left connected on
ALL evaporators. Room sensors must be
connected on master.
• 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
the 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 temperature, suction temperature,
room temperature
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 H-IM-UC Installation and Operation manual for
more details.