TH146-P-U
Installation Guide
Programmable H/C Controller
Removable
Connector *
TH146-P User Console
* To remove a connector from the control module, pry with a screwdriver.
CT280-3H3C Control Module
1. Introduction
1.1
The TH146-P-U programmable controller can be used with any of
the following heating/cooling systems:
Applications
Heat pump
HVAC
1H1C, 2H1C, 2H2C, 3H1C, 3H2C, 3H3C, 4H2C
1H, 2H, 3H, 1C, 2C, 3C, 1H1C, 1H2C, 2H1C, 2H2C,
2H3C, 3H1C, 3H2C, 3H3C
Removable
Connector *
AC144-03 Outdoor
Temp erature Sensor
2. Installation
2.1
Configure the control module according to your type of heating/cooling system using DIP switches on the back of the module.
Control Module (CT280-3H3C)
Heat pump
HVAC
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)
1.2
• CT280-3H3C control module
• TH146-P console with two wall anchors and mounting screws
• AC144-03 outdoor temperature sensor (3 m or 10 ft) with mount-
1.3
• RC845 relay (see section 2.4)
• AC146-410 plenum temperature sensor (see section 2.8)
• CT241 telephone controller (see section 2.10)
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Supplied Parts
ing clip (see section 2.7)
Accessories
Install the control module near the heating/cooling system, away
from any heat source.
2.2
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).
User Console (TH146-P)
n Choose a location about 1.5 m (5 ft) above the floor on an
inside wall.
o Loosen the captive screw under the console.
p Detach the console from its base by pulling the bottom section.
q Secure the base using th e w all an cho rs an d screw s.
r Connect the console to controller terminals TH and TH (no
polarity).
2.3
The terminals used to connect the heating/cooling system depend
on the type of system. See the appropriate wiring table on page 4.
Heating/Cooling System
needed if the heat pump is not connected to the controller
terminal WW.)
Install the sensor on the side of the plenum and
position it such that its aperture faces the air
flow.
Connect the sensor to controller terminals PS
and CS (no polarity). For more information,
refer to the instructions provided with the sensor.
NOTE: The maximum wiring length is 30 m
(100 ft).
2.9
Dual-energy Input
2.4
If you have an add-on installation, you might need an RC845 relay
to connect the furnace (auxiliary heating) and its fan to the controller. Install the relay near the control module and connect the wires
as follows:
• relay terminals W, G and C to controller terminals W1, G and C.
• relay terminals T and T to the appropriate furnace terminals: T
NOTE: Refer to the relay’s installation instructions for more details.
If you have a 3H1C or 4H2C heat pump, a second RC845 relay
might be required to connect the second auxiliary heat.
2.5
Connect the humidifier in series with the power supply between
controller terminals H and H (dry contact).
2.6
Connect the dehumidifier or air exchanger in series with the power
supply between controller terminals D and D (dry contact).
2.7
The outdoor sensor is required for the following:
When installing the sensor, observe the following guidelines:
Install the sensor using its mounting clip and connect it to controller
terminals OS and CS (no polarity).
NOTE: The maximum wiring length is 30 m (100 ft).
RC845 Relay
and T (oil); TH and TH (gas); R and W (electric).
Humidifier
Dehumidifier / Air Exchanger
Outdoor Sensor (AC144-03)
• outdoor temperature display
• balance points (heat pumps only, see section 4.2)
• defrost point (heat pumps only, see section 4.3)
• automatic humidity control (see section 7.2)
• use of an air exchanger (see section 4.10)
• Avoid locations where the sensor can be covered with snow
or exposed to direct sunlight.
• Avoid air outlets and concealed chimneys or stove pipes.
NOTE: The dual-energy input can be used only with a heat pump
equipped with auxiliary heat.
The dual-energy input can be connected to the dual-register meter
equipped with a normally open (NO) dry contact. Connect the controller terminals DE and CC to the meter terminals (yellow and red
wires).
The contact closes when the outdoor temperature drops below the
temperature setting on the meter. When the contact is closed, the
heat pump is disabled and only the auxiliary heat can be used.
2.10
To use the unoccu pied mode, the controller requires a remote control device such as Aube’s CT241 telephone controller equipped
with a normally open (NO) dry contact placed between terminals UN
and CC of the controller. The unoccupied mode is activated when
the contact closes. (See section 6.4.)
Unoccupied Mode Input
3. Configuration
3.1
To access the configuration switches, loosen the captive screw
under the console and separate the console from its base by pulling
the bottom section.
3.1.1 Access Mode (SW1-1)
INST: Installer mode. Gives access to all configuration parameters.
USER: User mode. Gives access to configuration parameters 1 to 4
only.
3.1.2 Keypad Lock (SW1-2)
I: The keypad is locked. Settings cannot be changed.
O: The keypad is unlocked.
3.2
Configuration Switches
NOTE: In installer mode, the short-cycle protection is disabled
and the interstage delay is reduced to 1 minute.
Software Configuration
n Place the console in Installer mode (INST) using the SW1-1
2.8
The plenum sensor is required for the following:
Plenum Sensor (AC146-410)
• low temperature limit inside the plenum (HVAC only)
• high temperature limit inside the plenum (HVAC only)
• fan limit if gas heating is used (HVAC only)
• high pressure protection during defrost cycle (This protection
is generally needed for add-on installations only. It is not
switch on the back of the console.
o Press the Mode button for 3 seconds to access the configura-
tion menu (see page 8). The first menu item (parameter) is displayed.
p To view another menu item, briefly press the Mode button.
q To modify a parameter, press either button.
r To exit the configuration menu, press .
s Return the console to User mode (USER).
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4. Principles of Operation
4.1
With automatic heating/cooling mode changeover, there’s no need to adjust
the controller at every change of season or weather condition. The controller
switches automatically between heating mode and cooling mode to maintain
the desired temperature.
Manual Mode
When the controller is in manual mode, the heating/cooling mode
changeover occurs as follows:
• The controller switches to cool ing mode when the indoor temperature
• The controller switches the heating mode when the indoor temperature
Automatic Mode
When the controller is in automatic mode, it follows the programmed schedule. Two temperature settings (heating setpoint and cooling setpoint) are
programmed for each period of the schedule. The heating/cooling mode
changeover occurs as follows:
• When the controller is in heating mode, the indoor temperature is main-
• When the controller is in cooling mode, the indoor temperature is main-
4.2
Balance Points are used to disable the heat pump or the auxiliary heating
when the outdoor temperature is below or above a set temperature.
• When the outdoor temperature is below the Balance Point Low
• When the outdoor temperature is above the Balance Point High (bP H),
NOTE: Balance Points cannot be used if the AC144-03 outdoor temperature
sensor is not connected to the controller.
4.3
The auxiliary heat is activated during defrost except under the following conditions:
• When the outdoor temperature is above the defrost point (see page 8,
• When the plenum temperature is above 40°C (104°F). The auxiliary
NOTE: The auxiliary heat’s short-cycle protection is disabled during defrost.
4.4
Automatic Heating/Cooling Changeover
is higher than the setpoint by more than 1.5°C (2.5°F) for 15 minutes.
is lower than the setpoint by more than 1.5°C (2.5°F) for 15 minutes.
tained at the heating setpoint. However, if the temperature rises and
remains above the cooling setpoint for 15 minutes, the controller will
switch to cooling mode.
tained at the cooling setpoint. However, if the temperature drops and
remains below the heating setpoint for 15 minutes, the controller will
switch to heating mode.
Balance Points (heat pumps only)
(bP L), the heat pump is disabled and only auxiliary heating can be
used (see page 8, item 5).
the auxiliary heat is disabled and only the heat pump can be used (see
page 8, item 6).
Heating During Defrost (heat pumps only)
item 7). Note: This condition will not apply if the AC144-03 outdoor sen-
sor is not connected to the controller.
heat is re-activated when the plenum temperature drops below 32°C
(90°F). Note: This condition will not apply if the AC146-410 plenum
sensor is not connected to the controller.
Types of Heat Pump Installations
• New Installation: In this type of installation, as there is not already a
furnace, the auxiliary heat source is installed at the same time as the
heat pump. In this type of installation, the indoor coils are located
upstream of the auxiliary heat. When the controller is configured for a
new installation, the heat pump and the auxiliary heat can operate
simultaneously.
4.5
Interstage Delay is the time allocated for the temperature to return to an
acceptable value when it deviates too far from the setpoint. If this time has
elapsed, the next heating or cooling stage is activated. The heating or cooling stage will be deactivated when the temperature returns to an acceptable
value. The Interstage Delay is fixed at 4 minutes if the controller is configured for an HVAC system and is user-adjustable if it is configured for a heat
pump (see page 8, item 9).
4.6
Low Temperature Limit (LLMT) and High Temperature Limit (HLMT) are
used to keep the plenum from becoming too cold or too hot. During cooling,
if the plenum temperature is lower than LLMT, a cooling stage is deactivated
starting with the one that was last activated. If, after a while, the temperature
is still too low, another cooling stage is deactivated and so on. Likewise, during heating, if the plenum temperature is higher than HLMT, a heating stage
is deactivated starting with the one that was last activated. If, after a while,
the temperature is still too high, another heating stage is deactivated and so
on. (see page 8, items 10 and 11.)
WARNING: LLMT and HLMT can be used in parallel with an UL353approved device but they do not replace such device.
NOTE: LLMT and HLMT cannot be used if the plenum temperature sensor is
not connected to the controller.
4.7
When Smart Fan is enabled (see page 8, item 15), the fan operates as follows:
• During periods 2 and 4 of automatic mode and during the unoccupied
• The fan operates continuously the rest of the time.
NOTE: For Smart Fan to work, set the fan to On (see section 5.3).
4.8
If a humidifier and a dehumidifier are both connected to the controller, the
controller will automatically switch between the two devices to maintain the
desired humidity level. The changeover occurs when the humidity deviates
from the setpoint by more than 3% for 30 minutes.
4.9
Dehumidification by droop is a method of dehumidification without using a
dehumidifier. This method is possible only if your system has a cooling
stage. When this feature is enabled (see page 8, item 18), if the humidity
level is too high, the temperature is temporarily lowered below the setpoint
to reduce the indoor humidity level.
NOTE: Dehumidification by droop can cause overcooling.
Interstage Delay
Low and High Temperature Limits
Smart Fan
mode (i.e., when you are away from home or sleeping), the fan operates only when heating or cooling is activated.
Automatic Humidification / Dehumidification Changeover
Dehumidification by Droop
The controller can be configured for either of the following types of heat
pump installations (see page 8, item 8).
• Add-on Installation: This type of installation is performed when adding
a heat pump to an existing furnace. When the heat pump is installed,
the furnace becomes the auxiliary heat source. In this type of installation, the indoor coils are usually installed downstream of the auxiliary
heat source. When the controller is configured for an add-on installation, the heat pump is disabled during auxiliary heating to prevent overpressure.
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4.10
Dehumidification using an air exchanger will not be efficient if the outdoor
temperature is too high. When an air exchanger is used, the controller will
disable dehumidification if the outdoor temperature is NOT lower than the
indoor temperature by more than 5°C (9°F). When this occurs, the message
HIGH TEMP is displayed.
Dehumidification by Air Exchanger
Wiring Tables
Heat Pump
Terminal Device 1H1C 2H1C 3H1C 2H2C 3H2C 4H2C 3H3C
TH
TH
PS Plenum sensor Connect the plenum sensor between the PS and CS terminals (no polarity)
CS Common S Common terminal for the plenum sensor and the outdoor sensor
OS Outdoor sensor Connect the outdoor sensor between the CS and OS terminals (no polarity)
DE Dual Energy Connect the dual-register meter between the DE and CC terminals (no polarity)
CC Common C Common terminal for the dual-energy meter and the unoccupied mode input
UN Unoccupied mode input Connect a dry contact between the UN and CC terminals (no polarity)
H
H
D
D
Dehumidifier (24 Vac / 1 A) Connect the dehumidifier between the D terminals (dry contact)
R
C
Y1 Compressor 1 (24 Vac / 1 A)
Y2 Compressor 2 (24 Vac / 1 A)
Y3 Compressor 3 (24 Vac / 1 A)
W1 Auxiliary heat 1 (24 Vac / 1 A)
W2 Auxiliary heat 2 (24 Vac / 1 A)
W3/O/B Reversing valve (24 Vac / 1 A)
G Fan (24 Vac / 1A)
L Fault (24 Vac / 5 mA)
WW Defrost (24 Vac / 5 mA)
NC Not used
Console Connect the console between the TH terminals (no polarity)
Humidifier (24 Vac / 1 A) Connect the humidifier between the H terminals (dry contact)
Power (24 Vac)
√√√√√√√
√√√√√√√
√√√√√√√
√√√√
√√ √√
√√
√√√√√√√
√√√√√√√
√√√√√√√
√√√√√√√
√
HVAC
Terminal Device 1H 2H 3H 1C 2C 3C 1H1C 1H2C 2H1C 2H2C 2H3C 3H1C 3H2C 3H3C
TH
TH
Console Connect the console sensor between the TH terminals (no polarity)
PS Plenum sensor Connect the plenum sensor betw een the PS and CS terminals (no polarity)
CS Common S Common terminal for both plenum sensor and outdoor sensor
OS Outdoor sensor Connect the outdoor sensor between the OS and CS terminals (no polarity)
DE Not used
CC Common C Common terminal for the unoccupied mode input
UN Unoccupied mode input Connect a dry contact between UN and R terminals (no polarity)
H
H
D
D
R
C √√√√√√√√√√√√√√
Humidifier (24 Vac / 1 A) Connect the humidifier between the H terminals (dry contact)
Dehumidifier (24 Vac / 1 A) Connect the dehumidifier between the D terminals (dry contact)
Power (24 Vac)
√√√√√√√√√√√√√√
Y1 Cooling unit 1 (24 Vac / 1 A) √√√√√√√√√√√
Y2 Cooling unit 2 (24 Vac / 1 A) √√√√√√√
Y3 Cooling unit 3 (24 Vac / 1 A) √√√
W1 Heating unit 1 (24 Vac / 1 A) √√√ √√√√√√√√
W2 Heating unit 2 (24 Vac / 1 A) √√ √√√√√√
W3/O/B Heating unit 3 (24 Vac / 1 A) √ √√√
G Fan (24 Vac / 1 A) √√√√√√√√√√√√√√
L Not used
WW Not used
NC Not used
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