WSHP Mark IV/AC Board Low Voltage Terminal Strip
OW2GW1Y1 F E L U A P V R C
1
2
3
Auxiliary Relay
Orange
Yellow
White
WSHP Mark IV/AC Board Low Voltage Terminal Strip
OW2GW1Y1 F E L U A P V R C
1
2
3
Auxiliary Relay
Orange
Yellow
White
Options on Mark IV/AC Units
The auxiliary relay is designed to interface external equip-
ment with the Mark IV/AC board. The auxiliary relay
has been provided with the components necessary
to protect from electrical damage that may occur to the
Mark IV/AC board when using standard off-the-self relays.
The auxiliary relay can be used to provide fault signals,
unit operation signals, or to provide a means for remote
equipment to control the Mark IV/AC board. The orange,
yellow, and white connections are short flying leads
pre-attached to the board. The diagrams shown are some
connection examples.
Auxiliary Relay (P/N 106059701)
WSHP Mark IV/AC Board Low Voltage Terminal Strip
OW2GW1Y1 F E L U A P V R C
1
2
3
Auxiliary Relay
Orange
Yellow
White
Operation: In this example the
auxiliary relay contacts can be
used to indicate a fault condi-
tion. With the auxiliary relay
connected as shown, the nor-
mally open contacts will close
during a fault condition.
Operation: In this example
the auxiliary relay contacts
can be used to signal WSHP
fan operation to another
device. In this example when
the thermostat energizes the
“G” terminal the auxiliary relay
normally open contacts will
close.
Operation: In this example the
auxiliary relay is used to interface
other control devices to the Mark
IV/AC board. Using the Orange (-)
and White (+) wires, and 24vac or
24vdc, another device could be
used to start and stop the WSHP
heating sequence.
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