User Guide

TStatSpec
TM
24
a
Factory jumper between RC and RH for systems with one
transformer.
b
The modulating sub-base doesn't support heat pumps.
c
Can also be used for W2 or Y2.
Usage Scenarios
Capable of controlling HVAC equipment generally described
as:
Conventional Roof Top Unit (RTU) with gas or electric heat
and DX cooling.
• 0-3 stages of heat.
Limit of 6 stages of heating and cooling combined.
• 0-4 stages of compressor.
Limit of 6 stages of heating and cooling combined.
• Single speed fan.
• Auxiliary relay used to enable economizer dampers, TOD
or Dehumidification.
Heat Pump Roof Top Unit (RTU) with gas or electric auxiliary
heat.
• 0-2 stages of auxiliary heat.
• 0-3 stages of compressor.
• Heating or cooling changeover valve, configurable for ON
for heat or ON for cool.
• Single speed fan.
• Auxiliary relay used to enable economizer dampers, TOD
or Dehumidification.
• Modulating Roof Top Unit (RTU)
Hot water valve or modulating gas heat and/or chilled water
valve.
• Heat enable, cool enable, or 0-2 stages of heat or
compressor.
The modulating outputs are always active. They are always
being driven 0-100%. When the number of stages is zero, the
relay outputs may be used to enable heating or cooling
outputs. This means the W1/Y1 relay will turn on when the
modulating output is nonzero and turn off when the output is
zero. Staged action may be used in addition to the modulating
outputs. The number of stages is set to 1 or 2. In this case, the
relay output(s) may be used for up to 2 stages of heating or
cooling. Note the user can't have both 2 stages of cooling and
2 stages of heating. In another example, the user could have
Mod Heat, heating pump enable relay, and 1 stage of cooling,
or Mod Heat, heating pump enable relay, and 2 stages of
cooling.
• Cooling analog output – direct or reverse acting
4-20mA or 2-10Vdc with user supplied external 500-ohm
resistor.
• Heating analog output – direct or reverse acting
4-20mA or 2-10Vdc with user supplied external 500-ohm
resistor.
• Single speed fan.
— Auxiliary rebulay used to enable economizer
dampers, TOD or Dehumidification.
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.
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.