TH146-N-U 1/12
TH146-N-U

Installation Guide

Non-programmable H/C Controller
The TH146-N-U electronic controller can be used with any of the fol-
lowing heating/cooling systems:
The following devices can be connected to the controller:
air recirculation fan
humidifier
dehumidifier or air exchanger
dual-register meter (dual energy)
remote control device (for the unoccupied mode)
• CT280-3H3C control module
• TH146 console with two wall anchors and mounting screws
• AC144-03 outdoor temperature sensor (3 m or 10 ft) with mount-
ing clip (see section 2.7)
• RC845 relay (see section 2.4)
• AC146-410 plenum temperature sensor (see section 2.8)
• CT241 telephone controller (see section 2.10)
Configure the control module according to your type of heating/cool-
ing system using DIP switches on the back of the module.
Install the control module near the heating/cooling system, away
from any heat source.
Install the console in a central location. Avoid locations with air
drafts (e.g., top of staircase or air outlet) or stagnant air (behind a
door). Do not install the console on a wall hiding air ducts nor
expose it to direct sunlight.
NOTE: If this controller replaces an old thermostat, any two of the
wires that were connected to the thermostat can be used to connect
the user console to the control module. The maximum wiring length
is 30 m (100 ft).
AC144-03 Outdoor
Temperature Sensor
TH146 User Console
CT280-3H3C Control Module
Removable
Connector *
Removable
Connector *
* To remove a connector from the control module, pry with a screwdriver.

1. Introduction

1.1 Applications
Heat pump 1H1C, 2H1C, 2H2C, 3H1C, 3H2C, 3H3C, 4H2C
HVAC 1H, 2H, 3H, 1C, 2C, 3C, 1H1C, 1H2C, 2H1C, 2H2C,
2H3C, 3H1C, 3H2C, 3H3C
1.2 Supplied Parts
1.3 Accessories

2. Installation

2.1 Control Module (CT280-3H3C)
2.2 User Console (TH146)
Heat pump HVAC