EWC Controls ULTRA-ZONE ULTRA-TALK UT-3000 Manual page 11

Zone Control Features
Ancillary IAQ Dry Relay Operation

The dry relay operation can be
utilized via a auxiliary controller
attached to the R, C, and Relay
terminals in zone 1.

When the auxiliary controller
initiates the call, terminals NO
and C on the dry relay will
close.

This connection will
bring on your ancillary
IAQ device.
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