TH146-N-DE
Installation Guide
Non-programmable Heat Pump Controller
AC144-03 Outdoor
Temperature Sensor
TH146 User Console |
CT280-HP-2H1C Control Module |
|
1. Introduction
1.1 Applications
The TH146-N-DE electronic controller can be used to control a heat pump system. The following devices can be connected to the controller:
heat pump
auxiliary heating (furnace) air recirculation fan humidifier
dual-register meter (dual energy)
remote control device (for the unoccupied mode)
1.2 Supplied Parts
•CT280-HP-2H1C control module
•TH146 console with two wall anchors and mounting screws
•AC144-03 outdoor temperature sensor (3 m or 10 ft) with mounting clip (see section 2.7)
1.3 Accessories
•RC845 relay (see section 2.5)
•AC146-410 plenum temperature sensor (see section 2.8)
•CT241 telephone controller (see section 2.10)
2. Installation
2.1 Control Module (CT280-HP-2H1C)
Install the control module on the furnace’s electrical panel, away from the heat source.
2.2 User Console (TH146)
Install the console in the area where you wish to measure the temperature and humidity. Avoid locations where there are 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 existing thermostat, the wires that were connected to the thermostat can be used to connect the console. The maximum wire length is 30 m (100 feet).
1)Choose a location about 5 ft. (1.5 m) above the floor on an inside wall.
2)Loosen the captive screw under the console.
3)Detach the console from its base by pulling the bottom section.
4)Secure the base using the wall anchors and screws.
5)Connect the console to controller terminals TH and TH (no polarity).
2.3 Heat Pump
Connect the heat pump to the controller as follows:
•Controller terminals R and C to heat pump terminals R and C (see section 2.4)
•Controller terminal Y to heat pump terminal Y
•Controller terminal O/B to heat pump terminal O
•Controller terminal WW to heat pump terminal WW
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•Controller terminal L to heat pump terminal L
•Controller terminal W to heat pump terminal W (see section 2.5)
•Controller terminal G to heat pump terminal G (see section 2.5)
2.4 24 V Transformer
You might need a 24 V transformer if you have an add-on installation. Connect the transformer to the controller terminals R and C (24 Vac In).
2.5 RC845 Relay
If you have an add-on installation, you might need a relay such as Aube’s RC845 to connect the furnace (auxiliary heating) and its fan to the controller. Install the relay near the control module. Connect the wires of the RC845 relay as follows:
•relay terminals W, G and C to controller terminals W, G and C.
•relay terminals T and T to the appropriate furnace terminals: T and T (oil); TH and TH (gas); R and W (electric).
NOTE: Refer to the relay’s installation instructions for more details.
2.6 Humidifier
Connect the humidifier to controller terminals C and H (no polarity).
2.7 Outdoor Sensor (AC144-03)
The outdoor sensor is required for the following:
•balance points
•automatic humidity control
•outdoor temperature display
•defrost point
When installing the sensor, observe the following guidelines:
•Avoid locations where the sensor can be covered with snow or exposed to direct sunlight.
•Avoid air outlets and concealed chimneys or stove pipes.
Install the sensor using its mounting clip and connect it to controller terminals OS and CS (no polarity).
NOTE: The maximum wire length is 30 m (100 feet).
2.8 Plenum Sensor (AC146-410)
The plenum sensor measures the temperature inside the plenum. This data is required for high pressure protection during the defrost cycle (see section 4.3).
NOTE: The plenum sensor is generally needed for add-on installations only. It is not 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 wire length is 30 m (100 feet).
2.9 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 terminals DE and CC of the controller to the terminals (yellow and red wires) of the dual-register meter.
When the contact is open, the heat pump and auxiliary heating operate as usual. The contact closes when the outdoor temperature drops below the set threshold. When the contact is closed, the heat pump is disabled and only the auxiliary heat can be used.
2.10 Unoccupied Mode Input
To use the unoccupied mode, the controller requires a remote control device such as Aube’s telephone controller CT241 equipped with a dry-contact output (normally open). The unoccupied mode is activated when the contact closes. (See section 5.6.)
2.11Wiring Table
24 Vac In |
R |
Power; 24 Vac |
|
C |
|
Thermostat |
TH |
Console connection |
|
TH |
|
Plenum |
PS |
Plenum temperature sensor connection |
Sensor |
CS |
|
Outdoor |
OS |
Outdoor temperature sensor connection |
Sensor |
CS |
|
Dual Energy |
DE |
Dual energy connection |
|
CC |
(requires a normally open contact) |
|
|
|
Unoccupied |
UN |
Unoccupied mode connection |
|
CC |
(requires a normally open contact) |
|
|
|
Heat Pump |
R |
Power; 24 Vac / 3 A |
|
C |
|
|
Y |
Output; 24 Vac / 1 A (compressor) |
|
O/B |
Output; 24 Vac / 1 A |
|
|
(reversing valve; energized on cool) |
|
WW |
Input; 24 Vac / 2 mA (defrost) |
|
L |
Input; 24 Vac / 2 mA (fault) |
Aux. Heat |
W |
Output; 24 Vac / 1 A (auxiliary heat and fan) |
|
G |
|
Humidifier |
C |
Output; 24 Vac / 1 A |
|
H |
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3. Configuration
3.1 Switch Configuration
To access the 3 configuration switches, loosen the captive screw under the console and separate the console from its base by pulling it from the bottom part.
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3.1.1 Backlight (SW1)
BL ON: The screen is always backlit.
AUTO: The screen is backlit only when a button is pressed. The backlight remains on for 12 seconds.
3.1.2 Access Mode (SW2)
INST: Installer mode. Gives access to all configuration parameters.
NOTE: In this mode, the short-cycle protection is disabled and the interstage delay is reduced to 1 minute.
USER: User mode. Gives access to configuration parameter 12 (humidity setpoint or humidity offset) only.
3.1.3 Keypad Lock (SW3)
I: The keypad is locked. Settings cannot be changed. O: The keypad is unlocked.
3.2 Software Configuration
nPlace the controller in Installer mode (INST) using the SW2 selector switch on the back of the console.
oPress the Mode button for 3 seconds to access the configuration menu (see page 4). The first menu item (parameter) is displayed.
pTo view another menu item, briefly press the Mode button.
The following table shows the order in which the parameters appear as well as a description of each parameter.
q To modify a parameter, press either 
button. r To exit the configuration menu, press 
.
sReturn the controller to User mode (USER) using the SW2 selector switch.
4.Principles of Operation
4.1 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 occurs as follows:
•The controller switches to cooling mode when the indoor temperature is higher than the setpoint by more than 1.5°C (2.5°F) for 15 minutes.
•The controller switches to heating mode when the indoor temperature is lower than the setpoint by more than 1.5°C (2.5°F) for 15 minutes.
4.2 Balance Points
Balance points are used to disable the heat pump operation or auxiliary heating below or above a certain temperature.
•When the outdoor temperature is below the balance point low (bP L), the heat pump is disabled and only auxiliary heating can be used (see page 4, item 2).
•When the outdoor temperature is above the balance point high (bP H), the auxiliary heat is disabled (see page 4, item 3) and only the heat pump can be used.
NOTE: Balance points will not work if the AC144-03 outdoor temperature sensor is not connected to the controller.
4.3 Heating During Defrost
The auxiliary heat is activated during defrost except under the following conditions:
•When the outdoor temperature is above the defrost point (see page 4, item 4). NOTE: This condition will not apply if the AC144-03 outdoor sensor is not connected to the controller.
•When the plenum temperature is above 40°C (104°F). The auxiliary 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.
NOTE: The auxiliary heat’s short-cycle protection is disabled during defrost.
4.4 Types of Heat Pump Installations
The controller can be configured for either of the following types of heat pump installations (see page 4, item 5).
•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.
•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 “Smart Fan”
When “smart fan” is enabled (see page 4, item 7), the fan operates as follows:
•During the unoccupied mode (i.e., when you are away from home), the fan operates only when heating or cooling is activated.
•The fan operates continuously the rest of the time.
NOTE: “Smart fan” is useful only when the fan is set to On (see section 5.2).
4.6 Interstage Delay
The interstage delay is the time that the temperature has to return to an acceptable value when it deviates too much from the setpoint. After this delay, auxiliary heating is activated. Auxiliary heating will be deactivated once the temperature returns to an acceptable value (see page 4, item 8).
TH146-N-DE |
400-280-000-G |
9/22/06 |
3/8 |
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