Henny Penny PFG-691 Technical Manual page 108

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Dec. 2016
A = Power switch "COOK" (ON) position input signal. There are two "power switch on"
input signals, 'A' and 'S'. The 'A' one is not dependent on the interlock chain, so the
controller is always able to read the On/Off status of the power switch even if the high
limit is tripped or the drain is open.
B = Power switch "PUMP" position input signal. Should not have A and B at the same
time*. *Exception: On 8-Hd Gas fryers, A and B *can* both be on at the same time --
when the C8000 controller turns the pump on periodically to stir the oil.
C = Pressure Solenoid Auto-Detect (8-Head Controllers Only). The "C" signal indicates
that a pressure solenoid (ASCO valve) is presently connected to the controller.
V = VOLTS -- 24 VAC detected at start of interlock chain. If "V" is missing, the 24 VAC
current limiter (fuse) might be tripped. This "fuse" device (located on the I/O board)
automatically resets as soon as the short condition is fixed.
H = HIGH LIMIT -- If "H" is present, the high limit is good. If "H" is missing, the high
limit is tripped out (overheated) or disconnected.
D = DRAIN SWITCH -- If "D" is present, the drain handle is closed. If "D" is missing,
the drain switch is open or disconnected.
S = Power switch "on" interlock circuit: If "S" is present, the power switch is in the ON
position. If the "S" is missing, the power switch is either off, failed, or wired incorrectly.
"F" is not used for 8-Head Gas Fryers:
F = The "F" input is always hardwired ON. (These fryers do not have fan vacuum sen-
sors.)
P = "Gas" auto-detect jumper.
8-Hd Gas fryers: This signal is hardwired ON and should never be present.
M = "Electric" auto-detect jumper.
8-Hd Gas fryers: This signal is hardwired OFF.
8-Head Gas Fryers:
The "FPM.PM" input signals monitor the induced draft ignition components (fan sensor
and ignition
modules).
8-Head Gas fryers have two ignition modules, and consequently two sets of "P" and "M"
signals. The left side P&M in the display (before the period) correspond to the left-side
ignition module in the fryer. The right side P&M (after the period) correspond to the
right-side ignition module.
The two sets of P&M signals are interlocked by relays on the I/O board inside the
controller. The controller cannot turn on the gas pilot valve unless both PV signals are
present. The controller cannot turn on the gas main valve (main burners) unless both MV
signals are present.
F = FAN -- This is the Fan sensor (vacuum switch) interlock input. When 'F' is present,
the vacuum sensor is closed (continuity). When 'F' is missing, the vacuum switch is open
or is disconnected.ignition module.module.
P = The PV (Pilot Valve) output from the ignition module. The ignition module turns PV
on when it is trying to establish or maintain the pilot flame.
M = The MV (Main Valve) output from the ignition module. The ignition module turns
MV on only when the module has a confirmed "flame sense" of its pilot flame. Keep in
mind that the MV signals are simply "enabling" signals for the gas burners -- the burners
are not actually activated unless the controller turns the Heat output on.
4-4
Description
Model 691