Heatcraft Refrigeration Products 25001501 - Manual (Page 4)

BEACON CONTROLLER
4
INSTALLATION INSTRUCTIONS
Before Installing or Starting Unit:
• Use a minimum 18 gauge wire for low voltage connections to cooler, condensing unit and Smart Controller.
• Transformer is shipped wired for 240V primary; if your supply voltage is 208V, change to the 208V tap.
• Refer to wiring schematic shipped on units for wiring; schematics in the Installation & Operation Manual are
typical schematics.
• If desired box temperature is different from preset factory temperatures (35˚F air defrost, -10˚F electric
defrost), see “Room Temperature Control”, Page 5 for options.
• Check Beacon board jumper settings to ensure that they match the application requirements; factory jumper
settings are shown on Table 3, Page 14.
• The low pressure switch time delay relay, located in the condensing unit, must be set at 2 minutes.
• Make sure all wiring connections are correct and tight.
• 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 is
cooled.
• The Beacon timing for evaporator defrost is based on when power is first applied to the Beacon board (i.e. if
4 defrosts per day will occur at 9:00 p.m. and every 6 hours thereafter) the system will perform a defrost.
• Some systems may require the crankcase heater to be energized 24 hours prior to start-up; the Beacon
should be de-energized for this period by disconnecting the 24V lead to the condensing unit terminal block.
To start the system, this 24V lead must be re-attached.
CONDENSING UNIT
The condensing unit control panel will contain the relays, contactors, transformer and terminal block appropri-
ately marked to match the wiring connections to be made.
UNIT COOLER(S)
Each unit cooler(s) will contain the Beacon controller, an electric expansion valve, a distributor, orifice, and
four thermistor sensors. These components are all factory mounted. The 4 sensors provide input to the
controller from the following: evap-in, evap-coil, evap-out and entering room air temperatures.
MASTER/SLAVE CONNECTION
The Beacon Controller allows multiple unit coolers to be connected in a master/slave configuration. Up to 6
Low Profile evaporators or up to 3 Medium Profile evaporators can be connected in a master/slave
configuration when using the standard factory shipped transformer. When connected in a master/slave
configuration, the entering room sensors must be disconnected from each of the slave units. When
connected to the Optional Smart Controller, the Optional Smart Controller controls the master and all the
slaves. (See Master/Slave wiring connections on typical wiring diagrams.)
During master/slave operation, there could be a delay in the reaction time of each slave to the master of up to
1 minute. The length of time is dependent on how many slaves are connected to the system.
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