6MV
Millivolt
System
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| THERMOSTAT |
Y | G | W | RC | RH | 6 |
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MV
RH
Figure 8. Typical wiring diagram for millivolt systems
From millivolt system
| W | W |
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MV |
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| G |
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| Y |
From millivolt system
Thermostat Terminal Connections
6MV
Millivolt
System
Y
Cooling
System
G
Fan
Relay
W | RC | RH | THERMOSTAT | |
SYSTEM | ||||
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| Hot | |
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| 24 VAC | 120 VAC | |
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| Neutral | |
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| TRANSFORMER | ||
6
MV
RH
From millivolt system
From 24 VAC
transformer
| W | W |
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MV | RC | RC |
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| G | G |
| Y | Y |
From fan relay
From cooling system
Thermostat Terminal Connections
Figure 9. Typical wiring diagram for millivolt systems + cool only, 3-wire systems
From zone valve
6
64
Zone 5
Valve
12
MV | Y | G | W | RC | RH | THERMOSTAT | 6 |
| W | W | |
SYSTEM | 6 | ||||||||||
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| MV |
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| G | |
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| Hot |
| RH |
| Y | |
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| 24 VAC | 120 VAC |
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| Neutral | From 24 VAC transformer | ||||
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| TRANSFORMER |
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| Thermostat Terminal Connections | |||
Figure 10. Typical wiring diagram for heat only, 3-wire, zone valve systems
6
MVY
Cooling
System
G
Fan
Relay
W
Heating
System
RC RH | THERMOSTAT | |||||||
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24 VAC |
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| Hot |
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| 120 VAC | ||
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| Neutral | ||
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HEATING TRANSFORMER | ||||||||
24 VAC |
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| Hot |
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| 120 VAC | ||
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| Neutral | ||
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COOLING TRANSFORMER | ||||||||
| From heating |
From 24 VAC | system |
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cooling transformer |
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6 | W | W | |
MV | RC | RC | |
G | |||
| G | ||
| Y | ||
| Y | ||
| RH | ||
RH | From fan relay | ||
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| From 24 VAC | From cooling | |
| system | ||
heating transformer |
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Thermostat Terminal Connections
Figure 11. Typical wiring diagram for heat/cool, 5-wire, two-transformer system
4.Place subbase over hole in wall and mark mounting hole locations on wall using subbase as a template.
5.Move subbase out of the way. Drill mounting holes.
6.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 screw anchors to secure subbase.
7.Push excess wire into wall and plug hole with a fire- resistant material (such as fiberglass insulation) to prevent drafts from affecting thermostat operation.
5