B O

NOTE

For 2-wire Heat only, attach to RH and W

 

 

 

JUMPER

 

 

 

 

WIRE

B O

 

 

 

 

Y

G

W

RC RH

THERMOSTAT

SYSTEM

 

 

 

 

 

Fan

Heating

 

 

 

Relay

System

 

Hot

 

 

 

 

 

 

 

24 VAC

120 VAC

 

 

 

 

Neutral

 

 

 

TRANSFORMER

 

 

 

(Class II Current Limited)

Y G W

Cooling Fan Heating System Relay System

THERMOSTAT

RC RH

 

 

 

 

SYSTEM

 

 

 

 

 

 

 

 

 

 

 

 

Hot

24 VAC

 

 

 

 

 

 

 

120 VAC

 

 

 

 

 

 

 

 

 

Neutral

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HEATING TRANSFORMER (Class II Current Limited)

Hot

24 VAC

120 VAC

Figure 2. Typical wiring diagram for

heat only, 3-wire, single transformer systems

Neutral

COOLING TRANSFORMER (Class II Current Limited)

JUMPER

WIRE

Figure 5. Typical wiring diagram for

heat/cool, 5-wire, two-transformer systems

THERMOSTAT

B

O

Y

G

W RC

RH

 

 

 

 

 

SYSTEM

 

 

Cooling

Fan

 

 

 

 

System

Relay

 

Hot

 

 

 

24 VAC

 

 

 

 

 

 

 

 

B

 

 

 

 

 

 

 

 

 

 

120 VAC

 

 

 

 

 

 

 

 

 

 

 

 

Neutral

 

 

 

 

 

 

 

 

 

 

TRANSFORMER

(Class II Current Limited)

 

JUMPER

 

WIRE

O

Y

G

Reversing

Compressor

Fan

Valve*

Contactor

Relay

JUMPER

WIRE

THERMOSTAT

W RC RH

SYSTEM

Hot

Figure 3. Typical wiring diagram for

cool only, 3-wire, single transformer systems

* Reversing valve is energized when the

system switch is in the COOL position

Neutral

TRANSFORMER

(Class II Current Limited)

 

 

 

NOTE

 

 

 

 

 

 

 

 

 

 

 

 

 

RED jumper wire (provided with thermostat) must be

 

 

 

 

 

 

 

 

 

 

connected between thermostat RH and RC terminals

JUMPER

 

 

 

 

 

 

 

 

for proper thermostat operation with this system.

WIRE

 

 

 

 

 

 

 

 

B

O

 

Y

G

 

W

RC RH

THERMOSTAT

 

 

 

 

 

SYSTEM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cooling

 

Fan

 

Heating

 

 

 

 

 

 

 

 

 

 

 

 

System

 

Relay

 

System

 

 

 

 

 

 

 

 

 

Hot

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24 VAC

 

 

 

 

 

 

 

120 VAC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Neutral

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TRANSFORMER

 

 

 

 

 

 

 

 

 

(Class II Current Limited)

Figure 4. Typical wiring diagram for

heat/cool, 4-wire, single transformer systems

Figure 6. Typical wiring diagram for heat pump

with reversing valve energized in COOL

JUMPER JUMPER

WIREWIRE

B

O

Y

 

G W

RC RH

THERMOSTAT

 

 

 

SYSTEM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reversing

 

Compressor

 

Fan

 

 

 

 

 

 

 

 

Hot

Valve*

 

 

Contactor

 

Relay

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24 VAC

 

 

 

 

 

120 VAC

* Reversing valve is energized when the

 

 

 

 

 

 

 

Neutral

 

 

 

 

 

 

 

system switch is in the HEAT position

 

TRANSFORMER

 

 

 

 

 

 

 

(Class II Current Limited)

Figure 7. Typical wiring diagram for heat pump

with reversing valve energized in HEAT

Heating System

1.Move SYSTEM switch to HEAT position. If the heating system has a standing pilot, be sure to light it.

2.Press to adjust thermostat setting above room tempera- ture. The heating system should begin to operate.

3.Press to adjust temperature setting below room tem- perature. The heating system should stop operating.

Cooling System

!CAUTION

To prevent compressor and/or property damage, if the outdoor temperature is below 50°F, DO NOT operate the cooling system.

1.Move SYSTEM switch to COOL position.

2.Press to adjust thermostat setting below room tem- perature. The blower should come on immediately on high speed, followed by cold air circulation

3.Press to adjust temperature setting above room tem- perature. The cooling system should stop operating.

3

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White Rodgers 1F87-251 specifications Heating System, Cooling System

1F87-251 specifications

The White Rodgers 1F87-251 is an advanced digital thermostat designed to provide homeowners with efficient climate control and energy savings. This versatile thermostat combines user-friendly features with cutting-edge technology to meet the demands of modern heating and cooling systems.

One of the main features of the 1F87-251 is its programmable functionality, allowing users to set customized heating and cooling schedules. This program capability enables users to adjust temperatures according to their daily routines, enhancing comfort while minimizing energy consumption. With up to four program periods per day, homeowners can easily create a schedule that reflects their lifestyle, ensuring the system operates efficiently when needed.

The thermostat boasts a user-friendly backlit display that shows the current temperature, set temperature, and system status at a glance. The intuitive interface makes programming and adjustments simple, even for those who may not be technologically savvy. Additionally, the large buttons and clear display improve accessibility, making it suitable for users of all ages.

Importantly, the White Rodgers 1F87-251 incorporates Smart Recovery technology, which allows the thermostat to calculate the optimal time to begin heating or cooling a space to reach the desired temperature by a specified time. This feature not only enhances comfort but also contributes to energy efficiency.

The 1F87-251 is compatible with a wide range of heating and cooling systems, including gas, oil, and electric systems, as well as heat pumps. This compatibility ensures that it can be seamlessly integrated into most residential HVAC setups. Moreover, the thermostat includes a staging feature, allowing for multi-stage heating or cooling, which helps provide a more consistent temperature control.

Another important aspect of the White Rodgers 1F87-251 is its energy-saving mode. By employing energy-saving features, such as setting higher temperatures during the summer and lower during the winter when the home is unoccupied, homeowners can significantly reduce their energy bills.

The thermostat's battery backup ensures that settings are retained even in the event of a power outage, providing peace of mind. Overall, the White Rodgers 1F87-251 is a highly functional and efficient thermostat that combines modern technology with ease of use, making it an excellent choice for those looking to enhance their home comfort while reducing energy usage.