Install Instructions

FIELD SELECTABLE OPTION SWITCHES

NOTE: Priority selection switches may be covered with protective lm. Remove be-

fore using selection switches.

– ZONE VALVE/PUMP SELECTION SWITCH –

Control must be in priority mode (priority switch ON) to access this

feature. With the zone valve/pump switch in the OFF position, only

the priority

ZONE VALVE terminals are energized when Zone 1

calls for heat. With the zone valve/pump switch in the ON position,

the priority PUMP terminals will be energized with 120Vac when

Zone 1 calls for heat.

IMPORTANT: A jumper wire (not included) must be installed be-

tween terminals 3 and 4 of Zone 1 when using the Priority Pump

Feature. A jumper is not required when using a zone valve.

–

PRIORITY SELECTION SWITCH –

If priority switch is in the ON position:

1. Zone 1 becomes priority zone.

2. When Zone 1 calls for heat, the priority zone is activated

and all other zones are deactivated. (Zone valves for Zones 2

and higher will not operate.) Priority ON light turns on.

3. Built-in timer automatically shuts off priority feature (light

off) temporarily if priority zone calls for heat longer than 30

minutes, allowing all zones to operate. Repeats every 30 min-

utes until priority zone is satised. Prevents house freeze-up

in event of indirect heater malfunction.

–

ZR-ZC SELECTION SWITCH –

The ZR-ZC switch is used in tankless coil boiler applications. The ZR-

ZC terminals on the AZ-CP control are connected to the ZR-ZC termi-

nals on the boiler aquastat or low limit control. If the ZR-ZC switch is in

the ON position the ZR-ZC terminals are energized when there is a call

for heat on the priority zone and the priority zone end switch is closed.