Applications
The TH146-N-U electronic controller can be used with any of the following heating/cooling systems:
The following devices can be connected to the controller:
Supplied Parts
Accessories
Control Module (CT280-3H3C)
Configure the control module according to your type of heating/cooling system using DIP switches on the back of the module.
User Console (TH146)
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).
Heating/Cooling System
The terminals used to connect the heating/cooling system depend on the type of system. See the appropriate wiring table on page 4.
RC845 Relay
If you have an add-on installation, you might need an RC845 relay to connect the furnace (auxiliary heat) and its fan to the controller. Install the relay near the control module and connect the wires as follows:
Humidifier
Connect the humidifier in series with the power supply between controller terminals H and H (dry contact).
Dehumidifier / Air Exchanger
Connect the dehumidifier or air exchanger in series with the power supply between controller terminals D and D (dry contact).
Outdoor Sensor (AC144-03)
The outdoor sensor is required for the following:
When installing the sensor, observe the following guidelines:
Plenum Sensor (AC146-410)
The plenum sensor is required for the following:
Dual-energy Input
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.
Unoccupied Mode Input
To use the unoccupied 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 5.6.)
Configuration Switches
To access the configuration switches, loosen the captive screw under the console and separate the console from its base by pulling it from the bottom part
Backlight (SW1-1)
Access Mode (SW1-2)
Keypad Lock (SW1-3)
Software Configuration
Automatic Heating/Cooling Changeover
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. The mode changeover is triggered as follows:
Balance Points (heat pumps only)
Heating During Defrost (heat pumps only)
The auxiliary heat is activated during defrost except under the following conditions:
Types of Heat Pump Installations
Interstage Delay
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 6).
Low and High Temperature Limits
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 7 and 8.)
Smart Fan
When Smart Fan is enabled (see page 8, item 12), the fan operates as follows:
Automatic Humidification / Dehumidification Changeover
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.
| Heat Pump | ||||||||
| Terminal | Device | 1H1C | 2H1C | 3H1C | 2H2C | 3H2C | 4H2C | 3H3C |
| TH | Console | Connect the console between the TH terminals (no polarity) | ||||||
| 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 | Humidifier (24 Vac / 1 A) | Connect the humidifier between the H terminals (dry contact) | ||||||
| H | ||||||||
| D | Dehumidifier (24 Vac / 1 A) | Connect the dehumidifier between the D terminals (dry contact) | ||||||
| D | ||||||||
| R | Power (24 Vac) | Ö | Ö | Ö | Ö | Ö | Ö | Ö |
| C | Ö | Ö | Ö | Ö | Ö | Ö | Ö | |
| Y1 | Compressor 1 (24 Vac / 1 A) | Ö | Ö | Ö | Ö | Ö | Ö | Ö |
| Y2 | Compressor 2 (24 Vac / 1 A) | Ö | Ö | Ö | Ö | |||
| Y3 | Compressor 3 (24 Vac / 1 A) | Ö | ||||||
| W1 | Auxiliary heat 1 (24 Vac / 1 A) | Ö | Ö | Ö | Ö | |||
| W2 | Auxiliary heat 2 (24 Vac / 1 A) | Ö | Ö | |||||
| W3/O/B | Reversing valve (24 Vac / 1 A) | Ö | Ö | Ö | Ö | Ö | Ö | Ö |
| G | Fan (24 Vac / 1A) | Ö | Ö | Ö | Ö | Ö | Ö | Ö |
| L | Fault (24 Vac / 5 mA) | Ö | Ö | Ö | Ö | Ö | Ö | Ö |
| WW | Defrost (24 Vac / 5 mA) | Ö | Ö | Ö | Ö | Ö | Ö | Ö |
| NC | Not used | |||||||
| HVAC | |||||||||||||||
| Terminal | Device | 1H | 2H | 3H | 1C | 2C | 3C | 1H1C | 1H2C | 2H1C | 2H2C | 2H3C | 3H1C | 3H2C | 3H3C |
| TH | Console | Connect the console sensor between the TH terminals (no polarity) | |||||||||||||
| TH | |||||||||||||||
| PS | Plenum sensor | Connect the plenum sensor between 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 | Humidifier (24 Vac / 1 A) | Connect the humidifier between the H terminals (dry contact) | |||||||||||||
| H | |||||||||||||||
| D | Dehumidifier (24 Vac / 1 A) | Connect the dehumidifier between the D terminals (dry contact) | |||||||||||||
| D | |||||||||||||||
| R | Power (24 Vac) | Ö | Ö | Ö | Ö | Ö | Ö | Ö | Ö | Ö | Ö | Ö | Ö | Ö | Ö |
| C | Ö | Ö | Ö | Ö | Ö | Ö | Ö | Ö | Ö | Ö | Ö | Ö | Ö | Ö | |
| Y1 | Cooling unit 1 (24 Vac / 1 A) | Ö | Ö | Ö | Ö | Ö | Ö | Ö | Ö | Ö | Ö | Ö | |||
| Y2 | Cooling unit 2 (24 Vac / 1 A) | Ö | Ö | Ö | Ö | Ö | Ö | Ö | |||||||
| Y3 | Cooling unit 3 (24 Vac / 1 A) | Ö | Ö | Ö | |||||||||||
| W1 | Heating unit 1 (24 Vac / 1 A) | Ö | Ö | Ö | Ö | Ö | Ö | Ö | Ö | Ö | Ö | Ö | |||
| W2 | Heating unit 2 (24 Vac / 1 A) | Ö | Ö | Ö | Ö | Ö | Ö | Ö | Ö | ||||||
| W3/O/B | Heating unit 3 (24 Vac / 1 A) | Ö | Ö | Ö | Ö | ||||||||||
| G | Fan (24 Vac / 1 A) | Ö | Ö | Ö | Ö | Ö | Ö | Ö | Ö | Ö | Ö | Ö | Ö | Ö | Ö |
| L | Not used | ||||||||||||||
| WW | Not used | ||||||||||||||
| NC | Not used | ||||||||||||||
2H1C Heat Pump — New Installation
3H2C Heat Pump — Add-on Installation
3H2C HVAC
| Item | HP | HVAC | Parameters | Display | Options | Default | Description |
| 1 | Ö | Ö | Temperature format | | °C / °F | °C | Select the temperature display format. |
| 2* | Ö | Balance point low |
| -30 to 10°C (-22 to 50°F) | -10°C (14°F) | Set the bP L limit (see section 4.2). NOTE: Lower bP L below its minimum (- -) if you do not wish to use this function. | |
| 3* | Ö | Balance point high |
| -5 to 30°C (23 to 86°F) | 5°C (41°F) | Set the bP H limit (see section 4.2). NOTE: Raise bP H above its maximum (- -) if you do not wish to use this function. | |
| 4* | Ö | Defrost point |
| -10 to 15°C (14 to 59°F) | 10°C (50°F) | Set the defrost point temperature (see section 4.3). NOTE: Raise the defrost point above its maximum (- -) if you do not wish to use this function. | |
|
5* |
Ö |
Installation type |
|
Ad / nr |
Ad | Set according to the type of heat pump installation (see section 4.4). • Ad (add-on): Use this setting when the indoor coils are located down- stream of the auxiliary heat source. This is generally the case for add-on installations. • nr (normal): Select this setting when the indoor coils are located upstream of the auxiliary heat source. This is generally the case for new installations. | |
| 6* | Ö | Auxiliary interstage delay |
| 5 to 90 min. | 30 min. | Set the interstage delay for the auxiliary stage (see section 4.5). | |
| 7 | Ö | Low temperature limit | | -10 to 20°C (14 to 68°F) | – – | Set the low temperature limit of the plenum (see section 4.6). NOTE: This function is not used if you lower LLMT below its minimum (- -) or if the plenum temperature sensor is not connected to the controller. | |
| 8 | Ö | High temperature limit | | 30 to 90°C (86 to 194°F) | – – | Set the high temperature limit of the plenum (see section 4.6). NOTE: This function is not used if you raise HLMT above its maximum (- -) or if the plenum temperature sensor is not connected to the controller. | |
| 9 | Ö | Ö | Cycles per hour | | 2 to 6 | 4 | Select the number of heating/cooling cycles per hour. For optimal heating control, use the setting that matches your system as follows: 3=20 min (hot water, 90%+ high-efficiency furnace), 4=15 min (gas or oil), 5=12 min (gas or oil), 6=10 min (electric). |
|
10 |
Ö |
Ö |
Heat type |
|
GA / EL |
EL | This setting determines the fan operation in automatic mode when the sys- tem is in heating mode (see section 5.2). • EL (electric heating): The fan starts when heating starts and stops when heating stops. • GA (gas or oil heating): The fan starts when the temperature inside the plenum rises above the Fan Limit (see item 11) and stops when the tem- perature drops 12°C below the Fan Limit. Note: The fan will not start if the plenum temperature sensor is not connected to the controller. |
| 11 | Ö | Ö | Fan limit |
| 38 to 90°C (100 to 194°F) | 80°C (176°F) | This parameter is available only when gas heating is selected (see item 10). WARNING: FLMT can be used in parallel with an UL353-approved device but they do not replace such device. NOTE: The fan will not start if you raise FLMT above its maximum (–). |
| 12 | Ö | Ö | Smart Fan | | On / OF | OF | • On: Smart Fan is On (see section 4.7). • OF: Smart Fan is Off. |
| 13 | Ö | Ö | Temperature setback | | 0 to 9°C (0 to 16°F) | 0°C (0°F) | Set the amount of temperature setback when the controller is placed in Unoccupied mode (see section 5.6). |
|
14 |
Ö |
Ö |
Outdoor temperature display |
|
On / OF |
On | Select between displaying the outdoor temperature or the indoor humidity level. • On Displays the outdoor temperature. • OF: Displays the indoor humidity level. NOTE: To display the outdoor temperature, the outdoor sensor must be connected. |
|
15 |
Ö |
Ö |
Humidifier operating mode | |
Co / HE / Fn |
HE | • Co (conventional): The humidifier will operate if the humidity is too low. If the fan is not already On, it will turn On at the same time as the humidifier. • HE (heat): The humidifier can operate only when heating is activated. • Fn (fan): The humidifier can operate as long as the fan is running, whether heating is activated or not. NOTE: The humidifier is disabled when cooling is activated. |
|
16 |
Ö |
Ö |
Automatic humidity adjustment |
|
On / OF |
OF | Allows you to set the humidity control to automatic mode. • On (automatic): The humidity level is automatically regulated by the con- troller according to the outdoor temperature to avoid condensation or ice formation on windows while providing enough humidity for your comfort (see item 17). • OF (manual): The user manually sets the humidity level (see item 17). |
|
17** |
Ö |
Ö | Humidity setpoint |
| 5 to 60% | 5 % | Set the desired humidity level. This parameter is available only when the humidity control is placed in manual mode (see item 16). |
| Humidity offset | -9 to 9% | 0 | This parameter is available only when the humidity control is placed in auto- matic mode (see item 16). It allows the user to apply an offset to the auto- matic humidity control. For example, the user can enter a negative offset if there is ice formation or condensation on the windows. | ||||
| * Parameters 2 to 6 are not available when the controller is configured for 1H1C, 2H2C or 3H3C heat pump. ** Only parameter 17 is available when the controller is in user mode (SW1-2 switch). | |||||||
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