Operation System Configuration | White Rodgers 1F90W-51 instruction

OPERATION

SYSTEM CONFIGURATION

ELECTRIC HEAT SYSTEMS

For central electric heat systems where the blower is energized by a separate circuit through the fan relay (meaning that the fan turns on immediately on call for heat), clip wire W14 on the back of the thermostat (see fig. 10). If the thermostat is energizing electric heat sequenc- ers, DO NOT clip wire W14.

ENERGY MANAGEMENT RECOVERY

(EMR)

When the EMR feature is activated, the thermostat's mocrocomputer automatically calculates the time it will take to change the temperature to the next program setting. Then the thermostat will activate the heating or cooling system to change the temperature so that the desired temperature is reached at or near the beginning of the next program period (the thermostat's microcom- puter calculates 15 minutes for every 2°F temperature change). For example, assume that the thermostat is programmed to provide an overnight heating temperature of 62°F, and during the next program period, programmed to begin at 6:00 AM, the programmed temperature is 70°F. With EMR activated, the thermostat will automati- cally activate the heating system at 5:00 AM, so that the programmed temperature of 70°F is reached by about 6:00 AM.

The thermostat is shipped with the EMR feature inactive, which means that the thermostat will activate the heating or cooling system at, not before, the beginning of the program period (real time).

To activate the EMR function, clip wire S3 on the back of the thermostat (see fig. 10).

6-pin Connector

Batteries

W14

3-pin Connector

Figure 10. Back of Thermostat

CHECK THERMOSTAT OPERATION

If at any time during testing the system does not function correctly, disconnect electrical power at fuse box or circuit breaker and check that all wiring is correct.

FAN OPERATION

1.Turn on power to the system. If the heat source has a standing pilot, be sure to light it.

2. Press	FAN	until FAN ON is displayed. The blower
	ON – AUTO

should begin to operate (this will work only on sys- tems with a G terminal).

On three-wire heat only systems, or on four-wire heat/ cool systems, if the thermostat display is operating

properly, but the fan does not operate when	FAN
	ON – AUTO

is pressed, the red jumper wire (provided with thermo- stat) may not be properly installed between the RH and RC terminals. Disconnect electrical power to system and properly install the jumper wire per the appropriate wiring schematic.

3. Press	FAN	until FAN AUTO is displayed. The
	ON – AUTO

blower should stop operating within approximately one minute.

HEATING SYSTEM

1. Press	SYSTEM	until HEAT is displayed (it may already
	HEAT-OFF-COOL-AUTO

be displayed).

2.Press to adjust thermostat above room tem- perature to call for heat. The heating system should begin to operate.

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.