3
REPLACEMENT INSTALLATION
REMOVE OLD THERMOSTAT
1. Shut off electricity at the main fuse box until installa-
tion is complete. Verify power is off with a voltmeter.
2. Remove the front cover of the old thermostat. With
wires still attached, remove wall plate from the wall.
3. If the old thermostat has a wall mounting plate,
remove the thermostat and the wall mounting plate as
an assembly.
4. FOR HEATING ONLY SYSTEMS — Disconnect the
two wires from the old thermostat. Skip steps 5
through 7 below and proceed to ATTACH SUBBASE
TO WALL.
5. FOR HEATING/COOLING SYSTEMS — Before re-
moving wires from old thermostat, identify the termi-
nals that have wires attached on the old thermostat.
Then use Table 1 to identify the type of thermostat you
are replacing. For example, if the old thermostat has
wires attached to terminals R, W, Y, and G, the old
thermostat is a type 5 (note that the old thermostat
may not have wires attached to all the terminals
identified in Table 1).
6. Use the self-adhesive labels enclosed with your
new thermostat to identify the wires attached to
the old thermostat. The labels correspond to the
thermostat type number you identified in step 5 above
(see Table 2). For example, if you determined that the
old thermostat is a type 5, use the labels for the type
5 thermostat (you may not use all the labels for the
type number you've identified if the old thermostat did
not have wires attached to all the terminals).
7. Label each wire as you disconnect it. The labels have
both the old terminal markings and the new terminal
identification. Discard any unused labels. PULL AT
LEAST SIX INCHES OF WIRE OUT OF THE WALL
WHEN YOU DISCONNECT IT - DO NOT ALLOW
THE WIRES TO FALL BACK INTO THE WALL.
ATTACH SUBBASE TO WALL
1. Remove the packing material from the thermostat.
Place the fingers of one hand on the center top and
bottom portion of the thermostat. Grasp the subbase
in the other hand on the top and bottom center, and
gently pull straight out (see fig. 2). The thermostat has
pin and socket connectors. Forcing or prying on the
thermostat will cause damage to the unit.
2. Pull wires through opening in the center of the sub-
base. DO NOT LET WIRES FALL BACK INTO
WALL.
3. Connect wires beneath terminal screws on subbase
using appropriate wiring schematic (see figs. 3 through
8).
4. Place subbase over hole in wall and mark mounting
hole locations on wall using subbase as a template.
(Installation instructions continue on page 5.)
G
RC
Mounting
Hole
Pull wires through
this opening
Connect wires under
terminal screws
Mounting
Hole
6-pin Connector
3-pin Connector
Y
W
Expansion
Plugs
Figure 3. Subbase
Activity
Light
RH
TABLE 1. OLD THERMOSTAT IDENTIFICATION
Type
1
Type
2
Type
3
Type
4
Type
5
4
RH
M
R5
R
W
W
H
4
W
RC
RC
V
Y
Y
C
Y6
Y
G
G
F
G
G
OLD
THERMOSTAT
TYPE
OLD THERMOSTAT
TERMINAL IDENTIFICATION
TABLE 2. WIRE IDENTIFICATION LABELS
Type
1
Type
2
Type
3
Type
4
Type
5
New Old
RH 4
New Old
RH RH
New Old
RH M
New Old
RH R5
New Old
RH R
New Old
W W
New Old
W W
New Old
W H
New Old
W 4
New Old
W W
New Old
RC RC
New Old
RC RC
New Old
RC V
New Old
Y Y
New Old
Y Y
New Old
Y C
New Old
Y Y6
New Old
Y Y
New Old
G G
New Old
G G
New Old
G F
New Old
G G
New Old
G G
PULL STRAIGHT OUT
Figure 2. Removing thermostat from subbase
(28 pages)
(16 pages)
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