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Mode
Provides
Operation and
Description
Display
A = Power switch ON
input signal. There are
two power switch on in-
put signals. This 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.
—————
V = VOLTS: 24 VAC
detected at start of in-
terlock chain. If V is
missing, the 24 VAC
current protector (fuse)
might be tripped. This
fuse device (located on
the I/O board) auto-
matically resets as
soon as the short con-
dition 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 is
open or disconnected.
S = POWER SWITCH:
on interlock circuit. If S
is present, the power
switch is in the ON po-
sition. If the S is miss-
ing, the power switch is
either off, failed, or
wired incorrectly.
—————
I I N N F F O O : The VHDS in-
puts are wired in series
as listed from left to
right. The first signal
that is missing causes
98
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