Relay Board; Computer Control - Pitco SELV Series Manual

24.8 Relay Board

NOTE: J connectors are marked on the relay board.
With 24 VAC supplied to pin #2 at connector J35 and a good F1 fuse, the relay board has a 24 VAC
output at pin #2 on connectors J33 and J34 and the AC indicator is illuminated.
When the board receives a 24 VDC SO input at pin #7 on connector J31 or J33, the SO indicator is
illuminated, the SO relay is energized, and there is a 24 VAC output at pin #4 on connector J32.
When the board receives a 24 VDC HD input at pin #6 on connector J31 or J33, the HD indicator is
illuminated, the HD relay is energized and there is continuity between pin #1 and pin #2 at connector
J32.

24.9 Computer Control

NOTE: All controller test points are at connector P/J1 (closest connector to the controller).
With 24 VAC supplied to pin #1(24 VAC supply) and pin #5 (24 VAC input from DVI), the display reads
"READY", "HEATING" or "MELT L/S".
When the controller is turned on, there is a 24 VDC output at pin #9 (SO).
When the controller calls for heat, there is a 24 VDC output at pin #8 (HD) and a 24 VAC input at pin #6
(HFB). If the HD contactor does not pull in, this indicates a break in the HD circuit.
To correct, do the following:
Check the hi-limit switch. Is it open or tripped?
Check the HD relay on the relay board. Is the HD relay energized, continuity through COM and NO
contacts?
If display reads "PROBE OP" "OPEN", Ω test the temperature probe. Check the wires and
connectors between the probe and controller for continuity.
If display reads "SYSTEM" 'FAILURE", Ω test the temperature probe, and the wires and connectors
between the probe and controller for a short.
If display reads "DRAINING" "TURN OFF", verify that the drain valve is closed, check the proximity
switch on the drain valve (If Equipped), turn the fryer off, and then turn the fryer on.
L22-393 R0 Page 77