2
When the battery is low, a Low Battery indication will be dis-
played to the user.
For an air conditioning system, up to six wires are needed
for 24 vac operation and one less wire for battery operation.
For a heat pump system, up to seven wires are needed for
24 vac operation and one less wire would be sufficient for bat-
tery operation. For heat only operation with batteries, only two
wires are required. When battery operation is used, the C termi-
nal does not need to be connected.
Provision is also made for separate heating and cooling
transformers via separable Rc and Rh terminals which are con-
nected via factory-installed jumper wire.
Wiring —
The wire length should be no more than 250 ft
(76 m). Use 22 AWG (American Wire Gage) for normal wiring
applications. Continuous wire lengths over 100 ft (30.5 m)
should use 20 AWG or larger.
Thermostat Location —
The thermostat should be
mounted:
• approximately 5 ft (1.5 m) from the floor
• close to or in a frequently used space, preferably on an
inside wall
• on a section of wall without pipes or ductwork
The thermostat should
NOT
be mounted:
• close to a window, on an outside wall, or next to a door
leading to the outside
• where exposed to direct light and heat or any other tem-
perature-radiating object which may cause a false
reading
• close to or in direct airflow from supply registers or
return air grille in areas with poor air circulation
INSTALLATION
To install the thermostat, perform the following procedure:
1. Turn off all power to equipment.
2. If an existing thermostat is being replaced:
a. Remove existing thermostat from wall.
b. Disconnect wires from existing thermostat, one at
a time. Be careful not to allow wires to fall back
into the wall.
c. As each wire is disconnected, record the wire color
and terminal marking.
d. Discard or recycle old control.
3. Press the thumb release at the top of the thermostat and
snap apart carefully to separate backplate from the ther-
mostat and expose mounting holes.
4. Route thermostat wires through large hole in backplate.
Level backplate against wall (for appearance only, the
thermostat does not need be leveled for proper operation)
and mark wall through two mounting holes. See Fig. 2.
5. Drill two
3
/
16
-in. mounting holes in the wall where
marked.
6. Secure backplate to wall with two screws and anchors
provided. Make sure all wires extend through hole in
backplate.
7. Adjust length and routing of each wire to reach proper
connector block and terminal on backplate with
1
/
4
-in.
(6 mm) of extra wire. Strip only
1
/
4
-in. of insulation from
each wire to prevent adjacent wires from shorting togeth-
er when connected.
8. Match and connect equipment wires to proper terminals
of the connector blocks (see Fig. 3). If there are separate
24 vac transformers, one in the indoor unit and one in the
outdoor unit, connect the common of each to the C termi-
nal. Remove factory-installed jumper wire from Rc and
Rh terminals. Connect the R from the indoor unit to the
Rh terminal. Connect the R from the outdoor unit to the
Rc terminal. Then the W signal is taken from the Rh pow-
er and the Y1, Y/Y2, G and O/B signals are taken from
the Rc power.
WARNING
Electrical shock can cause personal injury and death.
Before installing thermostat, shut off all power to this
equipment during installation. There may be more than one
power disconnect. Tag all disconnect locations to alert oth-
ers not to restore power until work is completed.
CAUTION
ENVIRONMENTAL HAZARD:
Failure to follow this caution may result in environmental
damage.
Mercury is a hazardous waste. Federal regulations require
that mercury be disposed of properly.
CAUTION
Failure to follow this caution may result in equipment dam-
age or improper operation.
Improper wiring or installation may damage the thermo-
stat. Check to make sure wiring is correct before proceed-
ing with installation or turning on unit.
MOUNTING
HOLE
S
Fig. 2 — Backplate Mounting
a33-9233
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