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Using universal relays to control heating or cooling
(Prestige and RedLINK VisionPRO models only.)
1
U1/U2/U3 terminals 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 system transformer. Do NOT install a field jumper if the stage of heating
has its own transformer.
Dry contact alerts
(Prestige and RedLINK VisionPRO models only.)
EQUIPMENT DAMAGE HAZARD. Do not apply power to S1–S4 terminals.
Do not connect a temperature sensor to the S1–S4 terminals if set for a dry
contact device.
NOTE: The dry contact device must be rated for low voltage.
If you are not using the S1–S4 terminals on the EIM, you can connect them to
a dry contact device to display an alert. Dry contact alerts include Full Drain
Pan, Dirty Filter, Water Leak, System Shutdown, Service Needed, Fan Failure and
Custom Alert. Dry contact device can be normally open (shown in diagram) or
normally closed.
NOTE: You can connect multiple Dry Contact devices in parallel to the S1–S4
terminals.
ONE DRY CONTACT DEVICE
MULTIPLE DRY CONTACT DEVICES
ON ONE SET OF TERMINALS
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
EIM
S4
S4
S3
S3
M34252B
TRANSFORMER
24
VAC
ONE DRY CONTACT DEVICE
EIM
S2
S2
MULTIPLE DRY CONTACT DEVICES
S1
S1
9
120
VAC
M39128
ON ONE SET OF TERMINALS
M39125
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