TH141-HC-28 400-141-000-B 2008-02-01 1/4
1.1 Remove the old thermostat
n Cut the power source to your heating or air conditioning system.
o Remove the cover of the old thermostat.
CAUTION: If, upon removing the wall plate, you see that it is mounted on
a junction box (similar to the junction box located behind an electrical
switch or outlet), this may indicate that it is a 120-V / 240-V system. For
more security, consult a qualified electrician to check the installation.
1.2 Install the new thermostat
For a new installation, choose a location about 1.5 meters (5 feet) above
the floor, with good air circulation. The thermostat must be installed on an
inside wall.
Avoid locations where there are:
• air drafts (top of a staircase, air outlet,...)
• dead air spots (behind a door,...)
• direct sunlight
• concealed chimneys or stove pipes.
1.3 Install and connect the thermostat
n Loosen the captive screw holding the faceplate to the mounting
plate.
o Pull the lower part to separate the faceplate from the mounting plate.
p Fix the mounting plate onto the wall using the supplied screws.
1.4 Identify the wires
n
If the wall plate of your old thermostat has more than two wires
coming out of the wall, you will need to label the wires. Start by
identifying the letters close to each screw or terminal on which a wire
is connected. These terminals may be located on either side of the
plate.
o Disconnect and identify each wire*.
p You may need to tape the wires to the wall to keep them from falling
back into it. If the wall opening is bigger than necessary, fill it with
insulating wool in order to prevent the infiltration of warm or cold air
behind the thermostat.
* If your installation is recent, the colour of the wires should match the
identification on the mounting plate.
1.5 Connect the labelled wires to the thermostat
n
Connect the system wires to the thermostat terminals according to
one of the wiring diagrams in section 1.6.
o Make sure to return the remaining wire length into the wall.
p If you own a CT240 telephone controller, refer to section 6.1 for
connection.
1.6 Wiring diagrams
The TH141 thermostat is compatible with most heating and air
conditioning systems. Multi-level heating and air conditioning systems,
Millivolt control heating systems, heat pumps and baseboard heating
units are not compatible with this thermostat. Baseboard units can be
connected using a 24-V relay.
1.6.1 2-wire heating system
n Connect the heating relay to terminal W.
o Connect the 24-V transformer to terminal
Rh.
In this case, the order of connection is
unimportant.
1.6.2 3-wire heating system with fan control
n Connect the heating relay to terminal W.
o Connect the fan relay to terminal G.
p Connect the 24-V transformer to terminal
Rh.
q Connect a wire between terminals Rh and
Rc.
1.6.3 3-wire air conditioning system with fan control
n Connect the air conditioning relay to
terminal Y.
o Connect the fan relay to terminal G.
p Connect the 24-V transformer to terminal
Rc.
1.6.4 4-wire heating and air conditioning system
n Connect the heating relay to terminal W.
o Connect the air-conditioning relay to
terminal Y.
p Connect the fan relay to terminal G.
q Connect the 24-V transformer to terminal
Rh.
r Connect a wire between terminals Rh and Rc.
1.6.5 5-wire heating and air-conditioning system
n Connect the heating relay to terminal W.
o Connect the air-conditioning relay to
terminal Y.
p Connect the fan relay to terminal G.
q Connect the 24-V heating transformer to
terminal Rh.
r Connect the 24-V air conditioning transformer to terminal Rc.
n
Installation
1.
(Rh) Red Heating power source
(W) White Heating relay
(Rc) Blue Air conditioning power supply
(Y) Yellow Air conditioning relay
(G) Green Fan relay
TH141-HC-28
User Guide
400-141-000-B ENG.fm Page 1 Friday, February 1, 2008 2:19 PM
(100 Seiten)
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