82
NOTE:
• P9 Auxiliary is a dry contact output: It requires
external power supply to energize connected
devices. See Figure 145.
• Load on P9 must not exceed 3 Amps. If the load is
larger than 3 Amps, use P9 auxiliary output to drive
a field-installed contactor. See Figure 147.
The built-in Auxiliary output (P9) is a dry-contact relay output that can be used as a switch to control valves, lights and
other devices.
EXTERNAL
POWER
SUPPLY
COM
NO
NC
AUXILIARY RELAY
OUTPUT
TEMP
INTPUT
TEMP
AUX
POWER BLOWER
P2 P1 P9
+
-
Figure 145. Auxiliary Relay
Use the Normally Closed (NC) and Normally Open (NO) terminals to drive a 3-way valve. This conguration typically
uses an external 24 VAC supply.
POSITION 1
POSITION 2
COMMON
COM
NO
NC
AUXILIARY RELAY
OUTPUT
TEMP
INTPUT
TEMP
AUX
POWER BLOWER
P2 P1 P9
AUXILIARY RELAY
INTPUT
TEMP
AUX
POWER BLOWER
P2 P1 P9
USE WITH A SPDT OR DPDT 24VAC RELAY
USE AN EXTERNA 24VAC
TRANSFORMER
COM
NO
NC
OUTPUT
TEMP
3-WAY VALVE
ACTUATOR
3-WAY VALVE
ACTUATOR
Figure 146. 3-Way Valve
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