Heatcraft Refrigeration Products II - Manual (Page 14)

14
Beacon II Controller
Installation Tips
• Use a minimum 18 gauge wire for all low voltage connections.
• The Beacon II board get 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.
• Refer to wiring schematic shipped on units for wiring. Schematics in this Installation and 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 one minute.
• Some systems may require the crankcase heater to be energized 24 hours prior to start-up. The Beacon II
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.
Condensing Unit
The condensing unit control panel contains the relays, contactors, 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 good
airflow and good clearances around unit.
Evaporator Unit
The evaporator contains the BEACON II controller(s), electric expansion valve(s), pressure transducer,
distributor(s), orifice(s), 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 the unit. See Heatcraft Refrigeration Installation Manual for more
details.