User Guide

TStatSpec
TM
19
• Remote Room Humidity Sensor.
• Remote Discharge Air Temperature Sensor.
• Remote Outdoor Air Temperature Sensor.
• Remote Occupancy Input (Digital Input).
• Access to the serial communications port on the
thermostat.
a
Factory jumper between RC and RH for systems with one transformer.
Two Heat / Two Cool:
This Subbase allows for conventional or heat pump operation. A total of eight relays are available with thermostat cover
assembly and subbase. The auxiliary relay may be configured for an economizer, TOD, or dehumidification. This sub base may
be configured for 2 Heat / 3 Cool by using the third stage of heat for an additional stage of cooling.
3 additional relays: Stage 2 heating, Stage 2 cooling, and Stage 3 heating / Stage 3 cooling.
Terminal
Conventional
Terminal Ht Pump Description
Rc
a
Rc
a
24 VAC Cooling transformer
Rh
a
Rh
a
24 VAC Heating transformer
X X Common.
G G Fan relay. (uses RC)
aux aux Auxiliary relay. (uses RH)
W1 O/B Conventional: Stage 1 heating relay.
Heat Pump: Changeover relay for heating (B) or cooling (O). (uses RH)
W2 W1 Conventional Stage 2 heating relay.
Heat Pump: 1
st
Stage auxiliary heat relay. (uses RH)
W3/Y4 W2 Conventional: Stage 3 heating or stage 4 cooling relay or auxiliary function if not used as
a stage.
Heat Pump: 2
nd
Stage auxiliary heat relay or auxiliary function if not used as a stage.
(uses RH)
Y1 Y1 Conventional Stage 1 cooling relay.
Heat Pump: Stage 1 compressor relay. (uses RC)
Y2 Y2 Conventional Stage 2 cooling
Heat Pump: Stage 2 compressor relay. (uses RC)
Y3 -- Conventional Stage 3 cooling relay or auxiliary function if not used as a stage.
Heat Pump: Used as an auxiliary function. (uses RC)
As As Discharge Air Sensor connection. (1)
As As Discharge Air Sensor connection. (2)
Os Os Outdoor Air Sensor connection. (1)
Os Os Outdoor Air Sensor connection. (2)
Hc Hc Humidity Sensor common.
Hp Hp Humidity Sensor Power: 24VAC.
Hs Hs Humidity Sensor signal: 0-10V.
M M Occupancy (Motion) Sensor. (1)
M M Occupancy (Motion) Sensor. (2)
T3 T3 Remote sensor common for T7770 or TR 21 or TR22 or TR23 or TR24 / T7771.
T4 T4 Remote sensor input for T7770 or TR 21 or TR22 or TR23 or TR24 / T7771.
T5 T5 Remote setpoint input for T7770 or TR 21 or TR22 or TR23 or TR24 / T7771.
T6 T6 Remote bypass input for T7770 or TR 21 or TR22 or TR23 or TR24 / T7771.
T7 T7 Remote LED output for T7770 or TR 21 or TR22 or TR23 or TR24 / T7771.