Connecting A Stage Of Heating Or Cooling To A Universal Relay - Honeywell THX9321 Prestige 2.0 Product Data

®
THX9321 PRESTIGE 2.0 AND THX9421 PRESTIGE
Fig. 345. Connecting a stage of heating or cooling to a universal relay (U1, U2, U3).
1 U1, U2, and U3 are normally open dry contacts when set up for a stage of heating or cooling.
2 You must install a field jumper if the stage of heating or cooling is powered by the system transformer. Do NOT install a field
jumper if the stage of heating has its own transformer.
68-0311—02
®
IAQ WITH EIM
U3
U3
U2
HEAT STAGE 3,
U2
COOL STAGE 3,
COOL STAGE 4 OR
U1
GEOTHERMAL
1
RADIANT HEAT
U1
2
RH
RC
R
24
VAC
C
150
TRANSFORMER
24 120
VAC VAC