User Guide

TStatSpec
TM
21
a
Factory jumper between RC and RH for systems with one transformer.
b
Can also be used for W2 or Y2.
c
Can also be used for W1.
Modulating Model (Model M):
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
b
aux
c
Conventional: Auxiliary relay or 2
nd
Stage of heating or cooling relay.
Heat Pump: Auxiliary relay or 1
st
Stage auxiliary heat relay. (uses RH)
W1 O/B Conventional: Stage 1 heating relay
Heat Pump: Changeover relay for heating (B) or cooling (O).
(uses RH)
Y1 Y1 Conventional: Stage 1 cooling relay.
Heat Pump: Stage 1 compressor relay. (uses RC)
Terminal
Conventional
Terminal Ht Pump
b
Description
Rc
a
N/A 24 VAC cooling transformer.
Rh
a
N/A 24 VAC heating transformer.
X N/A Common.
G N/A Fan relay. (uses RC).
aux
c
N/A Conventional: Aux relay or 2nd Stage of heat or cool relay.(uses RH).
W1 N/A Conventional: Stage 1 heating relay. (uses RH)
Y1 N/A Conventional: Stage 1 cooling relay. (uses RC)
Mc N/A Cooling Analog Output.
Mh N/A Heating Analog Output.
Mx N/A Analog Output common.
As N/A Discharge Air Sensor connection. (1)
As N/A Discharge Air Sensor connection. (2)
Os N/A Outdoor Air Sensor connection. (1)
Os N/A Outdoor Air Sensor connection. (2)
Hc N/A Humidity Sensor common.
Hp N/A Humidity Sensor Power: 24VAC.
Hs N/A Humidity Sensor signal: 0-10V.
M N/A Occupancy (Motion) Sensor. (1)
M N/A Occupancy (Motion) Sensor. (2)
T3 N/A Remote sensor common for T7770 or TR 21 or TR22 or TR23 or TR24 / T7771.