Heatcraft Refrigeration Products 25001501, Installation & Operating Instructions Manual, Page: 12 / 36

BEACON CONTROLLER
12
Error Codes
•
One blink — Superheat sensor shorted or open
•
Two blinks — Room temperature sensor shorted or jumper not installed
•
Three blinks — Compressor discharge temperature sensor shorted
•
Four blinks — High compressor discharge temperature
•
Five blinks — Superheat too low
•
Six blinks — High pressure, oil pressure or low pressure cut-out
•
Seven blinks — Defrost Termination sensor shorted.
Note: See Table 2 for thermistor sensor resistance values at selected temperatures. To check a sensor,
place it in an ice bath (a cup with ice and water) and stir. The resistance should be 32,650 ohms at the 32
°
F
bath temperature.
EVAPORATOR FANS SHUT-DOWN BY OPERATORS
In some installations, a switch is provided which allows an operator to de-energize the evaporator fans while
loading the freezer or cooler box. This may cause the evaporator coil to freeze-up. The compressor can be
de-energized when the evaporator fan is de-energized, by wiring a 24V AC coil, double pole single throw
(DPST), relay into the fan circuit. This relay, R3, and the wiring is shown on the TYPICAL WIRING SCHE-
MATICS, in the back of this installation manual. For multiple evaporators, additional relays wired in parallel to
R3, to break the other fans, will be needed.
STATUS INDICATOR LIGHT BLINK SEQUENCE
Mode Blink Time Off Time Action
Cooling 2 sec. 2 sec. Faster blinks for superheat count, then repeat
Off 1 sec. 7 sec. Repeat
Defrost 1 sec. 1 sec. Repeat
Error 8 fast 2 sec. Slower blinks for error code, then repeat
Resistance of thermistor sensors at various temperatures.
Temperature
°
F Ohms Temperature
°
F Ohms
104 5,320 32 32,650
86 8,060 23 42,330
77 10,000 14 55,330
68 12,490 5 72,950
59 15,710 -4 97,070
50 19,900 -13 130,410
41 25,400 -22 176,960
TABLE 2