ATTACH THERMOSTAT TO SUBBASE

JUMPER

WIRE

THERMOSTAT

Y

G

W RC

RH

From heating system

CONNECT red jumper

wire (provided)

W

W

NOTE

RED jumper wire (pro- vided with thermostat) must be connected be- tween thermostat's RH and RC terminals for pro- per thermostat operation with this system.

Cooling

System

Fan

Relay

Heating

System

SYSTEM

Hot

 

 

 

 

 

 

 

 

24vAC

 

 

 

 

 

 

120vAC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Neutral

TRANSFORMER

 

 

 

RC

 

 

G

G

 

RH

Y

Y

 

 

RH

 

 

From fan relay

From 24vAC

 

From cooling system

 

 

 

transformer

 

 

 

Thermostat Terminal Connections

Figure 7. Typical Wiring Diagram for Heat/Cool, 4-Wire, Single Transformer Systems

Y

G

Cooling

Fan

System

Relay

W

Heating

System

THERMOSTAT

RC RH

SYSTEM

Hot

24vAC

 

 

 

 

 

 

 

 

 

 

 

120vAC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Neutral

HEATING TRANSFORMER

Hot

24vAC

 

 

 

 

 

 

 

 

 

120vAC

 

 

 

 

 

 

Neutral

COOLING TRANSFORMER

From 24vAC From heating system

cooling transformer

 

W

W

RC

RC

G

G

Y

Y

RH

RH

From fan relay

 

From cooling system

From 24vAC

 

heating transformer

 

Thermostat Terminal Connections

Figure 8. Typical Wiring Diagram for Heat/Cool, 5-Wire, Two-Transformer System

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 expansion plugs 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.

To attach thermostat to subbase, line up the plastic snap guides at the bottom of the thermostat and the three connector pins on the thermostat with the connectors near the bottom left section of the subbase (when viewed from the front). Gently pivot the thermostat up until the six pin connectors and the plastic snaps lock into place (see fig. 9). Be gentle when attaching thermostat. If the thermostat does not seem to be attaching to the subbase easily, make sure that the connector pins and plastic snaps are properly aligned, and that excess wire is pushed into the wall. Damage to the thermostat may occur if force is used.

ATTACH THERMOSTAT TO SUBBASE

IT IS RECOMMENDED THAT YOU PROGRAM THE THERMOSTAT WITH BATTERIES INSTALLED BE- FORE ATTACHING ON SUBBASE (see OPERATION GUIDE for programming instructions).

!CAUTION

POWER TO THERMOSTAT MUST BE OFF BE- FORE ATTACHING THERMOSTAT TO WALL. FAILURE TO TURN OFF POWER BEFORE AT- TACHING THERMOSTAT MAY CAUSE EQUIP- MENT DAMAGE DUE TO RAPID COMPRESSOR CYCLING.

ENGAGE TWO LOWER GUIDES;

PIVOT UP

Figure 9. Attaching thermostat to subbase

5

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White Rodgers 1F90W-51 installation instructions Attach Thermostat To Subbase

1F90W-51 specifications

The White Rodgers 1F90W-51 is a sophisticated thermostat designed for modern heating and cooling systems, offering homeowners a blend of convenience, energy efficiency, and advanced technology. This programmable thermostat is well-regarded for its user-friendly features and ease of installation, making it a popular choice among DIY enthusiasts and professionals alike.

One of the standout features of the White Rodgers 1F90W-51 is its ability to provide precise temperature control. It supports a 7-day programming schedule, allowing users to set different temperatures for each day of the week, maximizing comfort while minimizing energy usage. This feature is particularly beneficial for families with varying schedules, enabling them to maintain optimal home temperatures when they are present and reduce heating or cooling when the house is empty.

The 1F90W-51 incorporates advanced technology that allows for compatibility with a wide range of HVAC systems, including conventional heating and cooling setups, heat pumps, and even multi-stage systems. The thermostat's digital display makes it easy for users to read and adjust settings, while its intuitive interface simplifies programming and operation.

In terms of efficiency, the White Rodgers 1F90W-51 is designed to help homeowners save on energy bills. By allowing for precise temperature adjustments and programmable schedules, it encourages users to optimize their heating and cooling usage. This not only protects the environment by reducing energy consumption but also translates to cost savings over time.

Another notable characteristic of the 1F90W-51 is its built-in temperature hold feature, which allows users to override the programmed settings temporarily. This is useful for occasions when unexpected changes in schedule may require a quick adjustment without the need to reprogram the entire unit.

In addition to functionality, the White Rodgers 1F90W-51 boasts a sleek design that blends seamlessly into any home décor. Its compact size and classic appearance allow it to fit well in various locations throughout the house.

Overall, the White Rodgers 1F90W-51 is a reliable and feature-rich thermostat that provides users with the tools needed to enhance their home comfort while remaining conscious of energy consumption. Its combination of programmability, compatibility, and user-friendly design makes it a top choice for those seeking an efficient and effective climate control solution.