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TH149 400-149-000-B 10/5/05 1/2
The TH149 thermostat is used for the following systems:
• Heat pump (1H1C and 2H1C)
• HVAC (1H1C)
The thermostat incorporates the following functions:
• System mode selection: heat, cool, auxiliary heat and off
• Fan mode selection: automatic or on (continuous)
• Emergency heat and fault LEDs
• Activation indicators (heat, cool, and auxiliary heat)
• Temperature display in °C or °F
• Backlit display
• Programmable heating and cooling cycle lengths
• Keypad lock
Note: The installation must be performed by a qualified electrician.
2.1 Removing the Old Thermostat
IN ORDER TO AVOID ANY RISK OF ELECTRIC SHOCK, CUT POWER TO
THE HEATING SYSTEM.
n Remove the old thermostat to access the wires.
o Identify and label each wire (with the corresponding letter on the old ther-
mostat terminals) and remove them from the terminals.
p If necessary, strip the end of each wire (maximum of 6 mm).
q If necessary, wrap the wires around a pencil to pre-
vent them from falling into the wall cavity.
r If the opening in the wall is too big, insulate it using
a non-flammable material to avoid air draughts
behind the thermostat.
2.2 Installing the Back Plate
Note: For a new installation, choose a location approximately 1.5 m (5 feet)
above the floor and on an inside wall. Avoid draughty areas (top of staircase,
air outlet, etc.) or dead air spots (behind doors). Do not install the thermostat
on a wall concealing air ducts nor expose it to direct sunlight.
n Loosen the locking screw (the screw cannot be com-
pletely removed).
o Detach the front module from the back plate by pulling
the bottom part.
p If necessary, bore the mounting holes
and insert anchors.
q Pass the wires through the opening of
the back plate and fix the plate to the
wall using the screws provided.
2.3 Connecting the Thermostat
The connection of the new thermostat should be similar to that of the old ther-
mostat; however, it can vary depending on the installation.
2.4 Jumper settings
The jumpers (JP1 and JP2), on the back of the front module, are used to con-
figure the thermostat according to your system type:
2.5 Completing the Installation
n Reinstall the front module onto the back plate and tighten the locking
screw.
o Place the system mode selector switch to OFF.
Note: Leave the switch to OFF until you have verified that the thermostat is
properly configured (see section 3).
p Apply power back to the system.
q Ensure that the thermostat is configured according to your system type
(see section 3).
n
Introduction
1.
o
Installation
2.
TH149
Electronic Thermostat
for Heat Pump and HVAC Systems
Installation and User Guide
Emergency heat
indicator
System mode
selector
Fan mode
selector
Fault
indicator
Temperature
display
Cooling is On
Heating is On
Auxiliary heat
is On *
Setpoint
indicator
Temperature adjustment buttons
* Auxiliary heat is available only for 2H1C systems.
R; C Power; 24 VAC
W Heater. This connection is not required for HP-1H1C.
Y Compressor
GFan
O/B
Reversing valve (see section 2.4). This connection is not required
for HVAC-1H1C.
L Fault
Jumper Parameter Settings
JP1 System
• Heat pump (HP position - default)
• HVAC (CN position)
JP2
Reversing
valve
• Activated in cool mode (O position - default)
• Activated in heat mode (B position)