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.Use the Cross Reference Guide to find the thermostat type you are replacing.
5.Identify each wire attached to the old thermostat using the labels enclosed with the new thermo- stat. Record the identification of the wire on the corresponding blank in Table 1.
6.Disconnect the wires from old thermostat one at a time. Pull at least 6 inches of wire out of the wall. DO
NOT LET WIRES FALL BACK INTO THE WALL.
7.Install new thermostat using the following proce- dures.
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.
NOTE
THIS THERMOSTAT REQUIRES BOTH THE HOT AND COMMON SIDES OF THE 24 VAC TRANS- FORMER TO BE PRESENT TO THE THERMOSTAT FOR OPERATION.
PULL STRAIGHT OUT
Figure 2. Removing thermostat from subbase
Screw 
anchors
Connect wires under
terminal screws
| S1 S2 S3 |
|
|
Mounting | O | W1 |
|
hole |
| ||
| B | Mounting | |
| Y1 |
| |
| Y2 | R | hole |
| C |
| |
| G | W2 |
|
| W3 |
|
Pull wires through
this opening
Figure 3. Subbase
2.Connect wires beneath terminal screws on subbase using wiring schematic for your particular application (see figs. 3 through 6).
3.Place subbase over hole in wall and mark mounting hole locations on wall using subbase as a template.
4.Move subbase out of the way. Drill mounting holes.
5.Fasten subbase loosely to wall, as shown in fig. 3, using two mounting screws. Place a level against bottom of subbase, adjust until level, and then tighten screws. (Leveling is for appearance only and will not
TABLE 1. TERMINAL REFERENCE
| 1F95 |
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| OLD THERMOSTAT | ||||
LABEL | TERMINAL |
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| TERMINAL | |||
NUMBER | DESIGNATION |
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| FUNCTION | DESIGNATION | ||||
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(1) |
| G |
| Fan Output |
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|
| ||
(2) |
| C |
| Transformer 24 VAC Common |
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| ||
(3) |
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| Transformer 24 VAC Hot |
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(4) |
| R |
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(5) |
| O |
| Changeover Output (Cooling) |
|
|
| ||
(6) |
| B |
| Changeover Output (Heating) |
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| ||
(7) |
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(8) |
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| |
(9) | Y1 |
| Stage 1 Cool |
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(10) | Y2 |
| Stage 2 Cool |
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(11) | W1 |
| Stage 1 Heat |
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(12) | W2 |
| Stage 2 Heat |
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(13) | W3 |
| Stage 3 Heat |
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3
