Honeywell TH150 User Manual

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:
TH150 Series
Installation and User Guide
VAV Thermostat
• TH150-1A • TH150-1F
• TH150-1A2T • TH150-1F2T
Depending on the model, the TH150 thermostat can have up to three outputs connected to the following control devices:
actuatorsthermal valves (N.O. and N.C.)solenoid valvessolid-state relays (SSRs)silicon-controlled rectifiers (SCRs)mechanical relayscontactors
Accessories
RC840 or RC840T electromechanical relayRT850 or RT850T solid-state relayAC146-410 temperature sensorAC144-03 temperature sensor
2. Installation
2.1 Mounting Instructions
n Remove 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.
Configuration and status display
Heating mode
Cooling mode
Temperature adjustment button
Override button
Temperature display
Output power display
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.
TERMINAL DESCRIPTION
1224 VAC
COM
34AN1
COM
34OPEN
CLOSED
56T2/AN2
T2/COM
78T3
T3
910COM
o Pass the wires through the center hole of the base and secure
the base to the wall or onto an electrical box.
p Wire the thermostat. See section 2.2 for terminal designations
and section 3 for typical wiring diagrams.
q Reinstall the thermostat onto its base and secure with the cap-
tive screw.
TH150 400-150-000-C 5/9/06 1/6
SENSOR
911COM
C-Over
912COM
NSB
Note: To configure the terminals, see section 4.
Power supply
Models TH150-1A and TH150-1A2T
Output 1
Models TH150-1F and TH150-1F2T
Output 2 (models TH150-1A2T and TH150-1F2T)
Output 3 (models TH150-1A2T and TH150-1F2T)
External sensor input. (For applications requiring an external sensor, see section 4.2.)
Mode Changeover input (N.O. contact). See sec­tion 5.5.2.
Night Setback activation input (N.O. contact). See section 5.6.
3. Typical Applications
FIGURE 1: Damper control with electric reheat and auxiliary baseboard heating.
FIGURE 3: Damper control with automatic changeover, elec­tric reheat and central cooling
FIGURE 2: Damper control with electric reheat and auxiliary hot-water heating
FIGURE 4: Temperature control of fresh air supply
CAUTION
Do not connect common to ground
FIGURE 5: Changeover and NSB inputs sharing the same 24-Vac transformer
TH150 400-150-000-C 5/9/06 2/6
FIGURE 6: Changeover and NSB inputs using different 24-Vac transformers
CAUTION
Do not connect com­mon to ground
Loading...
+ 4 hidden pages