Friedrich DSSXEMWRT3 - Using the HVAC Controllers Dry Contacts to Control External Devices

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General: HVAC Controller Installation
Using the HVAC Controller’s Dry Contacts to Control External Devices
The J9 port on the HVAC Controller can be used as a dry contact for control of
external devices such as lighting relays, dampers, and more. Refer to application
notes for more information.
• A jumper on J10 will make this a “wet” contact supplying power from R&C.
• For PTAC connection, connect the low voltage wires to screw terminals on the
PTAC unit low voltage terminal block - refer to the wiring diagram below.
R1
From 110VAC Breaker
FCU/VTAC/PTAC
Unit Control Board
(This will depend on
the HVAC)
BK
RD
WH
YE
BR
BK
PU
GR
OR
C
R
W
Y
OB
AU
GL
GH
OUT
IN
XFMR 01
Friedrich HVAC CONTROLLER