Honeywell Prestige 2.0 THX9421 Manual page 153

Fig. 350. Connecting a stage of heating or cooling to a universal relay (U1, U2, U3).
1U1, U2, and U3 are normally open dry contacts when set up for a stage of heating or cooling.
2You 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.
THX9321 PRESTIGE
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
153
®
2.0 AND THX9421 PRESTIGE
TRANSFORMER
24 120
VAC VAC
®
IAQ WITH EIM
68-0311—07