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Control Options on Mark IV/AC Units

Figure 12: Auxiliary Relay

Note: The auxiliary relay is designed to interface external equipment 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 ying leads pre-attached to the board. The

diagrams shown are some connection examples.

WSHP Mark IV/AC Board Low Voltage Terminal Strip

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.

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McQuay MWMV Specifiche Pagina 17