TH150 400-150-000-C 5/9/06 1/6
1. Introduction
The TH150 Series electronic thermostat is designed for low-voltage
pressure-dependent variable air volume (VAV) applications. It
comes in four different models:
Depending on the model, the TH150 thermostat can have up to
three outputs connected to the following control devices:
actuators
thermal valves (N.O. and N.C.)
solenoid valves
solid-state relays (SSRs)
silicon-controlled rectifiers (SCRs)
mechanical relays
contactors
Accessories
RC840 or RC840T electromechanical relay
RT850 or RT850T solid-state relay
AC146-410 temperature sensor
AC144-03 temperature sensor
2. Installation
2.1 Mounting Instructions
nRemove the thermostat from its base by unscrewing the cap-
tive screw and tilting the bottom of the thermostat up. The
screw cannot be completely removed.
oPass the wires through the center hole of the base and secure
the base to the wall or onto an electrical box.
pWire the thermostat. See section 2.2 for terminal designations
and section 3 for typical wiring diagrams.
qReinstall the thermostat onto its base and secure with the cap-
tive screw.
2.2 Terminal Designations
The designations of the terminals vary according to the particular
model of thermostat. Refer to the following table for the description
of each terminal.
• TH150-1A • TH150-1F
• TH150-1A2T • TH150-1F2T
Configuration and status display
Heating mode
Temperature display
Output power display
Temperature
adjustment
button
Cooling mode
Override button
TERMINAL DESCRIPTION
1
2
24 VAC
COM Power supply
3
4
AN1
COM Output 1
Models TH150-1A and TH150-1A2T
3
4
OPEN
CLOSED Models TH150-1F and TH150-1F2T
5
6
T2/AN2
T2/COM Output 2 (models TH150-1A2T and TH150-1F2T)
7
8
T3
T3 Output 3 (models TH150-1A2T and TH150-1F2T)
9
10
COM
SENSOR
External sensor input. (For applications requiring
an external sensor, see section 4.2.)
9
11
COM
C-Over
Mode Changeover input (N.O. contact). See sec-
tion 5.5.2.
9
12
COM
NSB
Night Setback activation input (N.O. contact).
See section 5.6.
Note: To configure the terminals, see section 4.
TH150 Series