User Guide

TStatSpec
TM
20
• Remote Room Sensor, T7770 or TR 21 or TR22 or TR23 or TR24 / T7771 Wall Module.
• Remote Discharge Air Temperature Sensor.
• Remote Outdoor Air Temperature Sensor.
a
Factory jumper between RC and RH for systems with one transformer.
b
Can also be used for W3 or Y3.
c
Can also be used for W2
One Heat / One 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 subbase may be
configured for 1 Heat / 2 Cool by using the second stage of heat for an additional stage of cooling.
2 additional relays: Stage 1 heating, Stage 1 cooling, and Stage 2 heating / Stage 2 cooling.
Terminal
Conventional
Terminal Ht Pump Description
Rc
a
Rc
a
24 VAC Cooling transformer
Rh
a
Rh
a
24 VAC Heating transformer
XX Common.
G G Fan relay. (uses RC)
aux
b
aux
c
Conventional: Auxiliary relay or 3
rd
stage of heating or cooling.
Heat Pump: Auxiliary relay or 2
rd
stage of auxiliary heat. (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)
Y1 Y1 Conventional: Stage 1 cooling relay.
Heat Pump: Stage 1 compressor relay. (uses RC)
Y2 Y2 Conventional: Stage 2 cooling relay.
Heat Pump: Stage 2 compressor relay. (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)
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.