XLT XD-9004B - Manual (Page 55)

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AVI HOOD ELECTRICAL CONNECTIONS
MUA Damper Relays - Single Output - World Voltage & Frequency
Some wiring removed for clarity. See schematic for details.
TS 1 TS 2
A1 A2
Power Power
MUA Unit Relay
Customer Supplied
LINE
S2 S3 S4
LOAD
XFMR
24 VAC
+ -