Setting Slider Tabs - Honeywell Home T10 Product Data

Table 8. Terminals on THM04R3000 Equipment Interface Module (EIM) Used With T10+ Models Only.
Conventional Systems
Terminal
S1, S2, S3, S4 Input for indoor sensor, outdoor sensor, Floor sensor,
(Two of each) RATS, DATS, or Dry Contact Alert
Y Compressor Stage 1
Y2 Compressor Stage 2
G Fan Relay
C Common from HVAC transformer when R is jumped to Rc.
Common from separate transformer if R is not
jumpered
U1, U2, U3 Relay for humidifier, dehumidifier, or ventilator
(Two of each)
L Not used for conventional applications
O/B Not used for conventional applications
W1 Heat Stage 1
W2 Heat Stage 2
W3 Heat Stage 3
R 24V from transformer to power EIM
Rc 24 VAC Cooling transformer
Rh 24 VAC Heat transformer

Setting Slider Tabs

Set R Slider Tab, see Fig. 13.
• Use built-in jumper (R Slider Tab) to differentiate
between one or two transformer systems.
• If there is only one R wire, and it is connected to the
R, Rc, or RH terminal on the old thermostat, set the
slider to the up position (1 wire).
• If there is one wire connected to the R terminal and
one wire connected to the Rc terminal, set the slider
to the down position (2 wires).
9
Fig. 13.
Description
M37789
Heat Pump Systems
Terminal
S1, S2, S3, S4 Input for indoor sensor, outdoor sensor, Floor sensor,
(Two of each) RATS, DATS, or Dry Contact Alert
Y Compressor Stage 1
Y2 Compressor Stage 2
G Fan Relay
C Common from HVAC transformer when R is jumped to Rc.
Common from separate transformer if R is not
jumpered
U1, U2, U3 Relay for humidifier, dehumidifier, or ventilator
(Two of each)
L Connect to compressor monitor
O/B Changeover valve for heat pumps
W1 Not used for heat pump applications
AUX1 Stage 1 of AUX/EM heat
AUX2 Stage 2 of AUX/EM heat
R 24V from transformer to power EIM
Rc 24 VAC Cooling transformer
Rh 24 VAC Heat transformer
Set U Slider Tab, see Fig. 14.
• Use built-in jumper (U Slider Tab) for IAQ device.
• When the U Slider Tab is in the down position (2
wires) the U contacts are a dry set of contacts.
• If your IAQ device is powered by the cooling
transformer, move the U Slider Tab to the up
position (1 wire). When this is done, the lower U
terminal is internally jumped to the Rc terminal. In
this application, you would hook up one wire from
your IAQ device to the upper U terminal and the
other to the common side of the cooling transformer.
The 1 wire setting is most commonly used when
using a fresh air damper for ventilation or using low
speed fan for dehumidification.
• See wiring examples on the next page.
9
Description
M37790
Fig. 14.
33-00462—05