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 affect thermostat operation.) If you are using existing mounting holes, or if holes drilled are too large and do not allow you to tighten subbase snugly, use plastic expansion plugs to secure subbase.
6.Push excess wire into wall and plug hole with a fire- resistant material (such as fiberglass insulation) to prevent drafts from affecting thermostat operation.
Expansion
plugs
Connect wires under
terminal screws
Mounting |
| S1 S2 S3 |
|
|
|
hole | O |
| W1 |
| |
| B |
| E1 | Mounting | |
| Y1 |
| E2 |
| |
| Y2 |
| L |
| hole |
| C |
| R |
|
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| G |
| W2 |
|
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| W3 |
|
| ||
|
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|
| ||
Pull wires through
this opening
Figure 3. Subbase
!WARNING
DO NOT EXCEED MAXIMUM VOLTAGE OR CUR- RENT RATINGS. FIRE, PERSONAL INJURY, AND/ OR EQUIPMENT DAMAGE COULD RESULT.
!CAUTION
To prevent electrical shock and/or equipment damage, disconnect electrical power at the main fuse box until installation is complete. Verify power is off with a voltmeter.
NOTE
The following wiring diagrams show typical terminal identification and wiring. For proper installation, refer to the original manufacturers' instructions.
Thermostat
Control
Circuit
Malfunction
Light
O | B | Y1 |
| Y2 |
| G | E2 |
| E1 |
| W1 | W2 |
| W3 | |||||||
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| Changeover |
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| Compressor |
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| Emergency |
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| Heat |
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| Heat | |||||
| Energized |
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| Contactor |
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| Relay |
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| Relay |
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| Relay | |||||
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| Constant |
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| In Heat |
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| Stage 2 |
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| Stage 1 |
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| Stage 3 | ||||||
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| Output |
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Changeover |
| Compressor |
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| Fan |
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| Emergency |
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| Heat |
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| |||||||
Energized |
| Contactor |
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| Relay |
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| Relay |
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| Relay |
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| Switched |
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In Cool |
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| Stage 1 |
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| Stage 2 |
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| Output |
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THERMOSTAT
CL R
SYSTEM
System
Monitor
Switch
Hot
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24vAC |
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| 120vAC |
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Neutral
TRANSFORMER
Figure 4. Typical wiring diagram for single transformer systems
4
