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WSHP Mark IV/AC Board Low Voltage Terminal Strip
O W2 G W1 Y1 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
O W2 G W1 Y1 F
E
L
U
A
P
V
R
C
1
2
3
Auxiliary Relay
Orange
Yellow
White
Options on Mark IV/AC Units
Motorized Valve & Relay for Unit Sizes 007 to 060
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 connec-
tions are short flying leads pre-attached to the board. The
diagrams shown are some connection examples.
Auxilliary Relay (P/N 106059701)
Wired as shown below the motorized valve will open on
a call for compressor operation. Valves for unit sizes
007 to 019 are
1
⁄
2
" power-open spring-return, while unit
sizes 024 to 060 are
3
⁄
4
" power-open spring-return.
Other thermostat combinations may be used. Valve and
auxiliary relay are purchased separately.
Note: The wiring shown below can only be used when the “P” terminal
is not being used as a pump restart signal to other equipment. If the
“P” terminal must be used as a pump restart signal to other equipment,
then wire the auxiliary relay’s yellow wire to “Y1”, white wire to “W1”,
and orange wire to “C”, then the valve will open on a call for occupied
heating or cooling from the thermostat.
6
3
1
Black to 6
White to 1
Plug
Pins,
Female
Conduit
Anti-Short
Bushing
Connector
Valve
36" (915 mm)
Lead Length
Operation: In this example the
auxiliary relay contacts can be
used to indicate a fault
condition. With the auxiliary
relay connected as shown, the
normally 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.
P/N 060977401 - 1/2" Valve Kit
P/N 060977301 - 3/4" Valve Kit
P/N 859004354 - Valve Relay Kit
WSHP Mark IV/AC Board Low Voltage Terminal Strip
O W2 G W1 Y1 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
O W2 G W1 Y1 F
E
L
U
A
P
V
R
C
1
2
3
Auxiliary Relay
Orange
Yellow
White
6
3
1
Time Clock
(by others)
Daisy-chain to
additional Mark IV/AC
board “U” terminals
BL
GN