Manualshelf

User Guide

ManualsBrandsHoneywell ManualsCommercial Pro ThermostatsUSB Thermal Interface Module Cable for T3750 Series Thermostats and TStatSpec Software
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TStatSpec
TM
22
a
Factory jumper between RC and RH for systems with one transformer.
b
The modulating subbase doesn't support heat pumps.
c
Can also be used for W2 or Y2.
Communicating Subbase
Communicating Subbases have one of the following configurations:
Three Heat /Three 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 2 Heat / 4 Cool by using the third stage of heat for an additional stage of cooling.
4 additional relays. Stage 2 heating, Stage 3 heating (or Stage 4 cooling relay), Stage 2 cooling, and Stage 3 cooling.
• Humidity sensor mounted in subbase.
• Remote Room Sensor, T7770 or TR 21 or TR22 or TR23 or TR24 /T7771 Wall Module.
• 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.
• Terminals for base wall plate are listed in the table given below.
T4 N/A Remote sensor input for T7770 or TR 21 or TR22 or TR23 or TR24 / T7771.
T5 N/A Remote setpoint input for T7770 or TR 21 or TR22 or TR23 or TR24 / T7771.
T6 N/A Remote bypass input for T7770 or TR 21 or TR22 or TR23 or TR24 / T7771.
T7 N/A Remote LED output for T7770 or TR 21 or TR22 or TR23 or TR24 / T7771.
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.
Heat Pump: 2
nd
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.
Heat Pump: Stage 2 compressor relay. (uses RC)
Y3 -- Conventional Stage 3 cooling relay.
Heat Pump: Not Used (uses RC).
AS AS Discharge Air Sensor connection. (1)