FBD 77 Series, Installation And Operation Manual

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Error #510: Compressor not turning on
1 Manually turn on compressor and ensure the contactor located in the electrical box engages.
2 If contactor does not engage then check for 24 VAC at the contactor coil. Note: The voltage will
read ~19 VAC when not powered. Refer to the wiring schematic for details. If no voltage, install
a new control board and check for 24 VAC again.
3 If 24 VAC is present at the contactor coil but it does not engage then replace the contactor.
4 If contactor engages, check to make sure the voltage at contactor terminals T1 and T2 is above is
above 187 V when the compressor is starting. If below 187 V, the line voltage supply needs to be
corrected.
5 If voltage at T1 and T2 is good then substitute a “known to be good” run capacitor. If compressor
starts, replace the original run capacitor.
If compressor still won’t start:
6 Remove the wires from the compressor and check for continuity between the C-R, C-S and R-S
terminals of the compressor. If the compressor is hot, a lack of continuity can indicate a tripped
thermal protector. It may take considerable time for the compressor to cool down and reset the
protector. If continuity cannot be established through all motor windings when cooled down, the
compressor should be replaced.
7 Check the compressor motor for a ground fault by conducting a continuity check between the
common terminal (C) and the compressor shell. If there is continuity then replace the compressor.
8 Check the compressor motor windings for proper resistance using the table below. If out of spec,
then replace the compressor.
Compressor Winding Resistance
Model C-R C-S
Copeland ZB15KCE-PFV 0.94-1.08 2.12-2.44
Copeland ZB19KCE-PFV 0.84-0.97 2.52-2.90
Copeland ZB19KCE-PFJ 1.12-1.28 2.07-2.39
Error #521, 522, 523, 524: Refrigeration solenoid stuck open
Error# 531, 532, 533, 534: Defrost solenoid stuck open
1 Verify the solenoid is not activated by going to the Manual ON/OFF. Remove wiring from the
suspect solenoid and check for 24 VAC. Note: The voltage will read ~19 VAC when not powered.
2 If no voltage (~19 VAC) then replace the solenoid valve.
3 If 24 VAC is present then replace the control board
Error #540: Low refrigeration pressure
1 The low side refrigeration pressures (as read on LCD display) during a single barrel freeze cycle
should be between 40-55 PSI and the high side above 250 at 75 degree ambient.
2 If you suspect the refrigeration charge is low, locate leak and repair. Refer to nameplate on the
back of the dispenser for proper charge using 404A refrigerant.