Installation, Remove OLD Thermostat | White Rodgers 7904 specification

INSTALLATION

REMOVE OLD THERMOSTAT

1.Shut off electricity at the main fuse box until installation is complete. Ensure that electrical power is disconnected.

2.Remove the front cover of the old thermostat. With wires still attached, remove wall plate from the wall. If the old thermostat has a wall mounting plate, remove the thermostat and the wall mounting plate as an assembly.

3.Identify each wire attached to the old thermostat using the labels enclosed with the new thermostat.

4.Disconnect the wires from old thermostat one at a time. DO

NOT LET WIRES FALL BACK INTO THE WALL.

5.Install new thermostat using the following procedures.

ELECTRIC HEAT OR SINGLE-STAGE

HEAT PUMP SYSTEMS

Read entire paragraph before setting electric heat switch. If you are unsure of your application, contact a qualified serviceperson.

If you have a single-stage heat pump system, OR your system uses central electric heat, then you must move the switch on the back of the thermostat base to the electric heat position (see fig 1). The electric heat position is to the left. Use a small screw- driver or pencil to move the switch.

ATTACH THERMOSTAT BASE TO WALL

1.Remove the packing material from the thermostat. Gently pull the cover straight off the base. Forcing or prying on the thermostat will cause damage to the unit. If necessary, move the electric heat switch (see ELECTRIC HEAT SYSTEMS, above).

2.Connect wires beneath terminal screws on base using appropriate wiring schematic (see figs. 3 through 10).

3.Place base over hole in wall and mark mounting hole locations on wall using base as a template.

4.Move base out of the way. Drill mounting holes.

5.Fasten base loosely to wall, as shown in fig. 2, using two mounting screws. Place a level against bottom of base, 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 base snugly, use plastic screw anchors 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.

BATTERY LOCATION

This thermostat requires 3 “AA” alkaline batteries to oper- ate. Batteries are included. Install the batteries along the top of the base (see fig. 2). The batteries must be installed with the positive (+) ends to the left.

If the word BATTERY is displayed, the batteries are low and should be replaced with fresh “AA” Energizer® alkaline batteries.

ELECTRIC GAS

Electric/Gas switch

Figure 1. Back of thermostat base

Alkaline batteries (3 “AA”– install “+” ends to the left)

Screw anchors

W	RH
RC
G	B
Y	O

Mounting

holes

Figure 2. Thermostat base

HYDRONIC (HOT WATER OR STEAM)

HEATING SYSTEMS

This thermostat is set to operate properly if you have a forced- air heating system. If you have a hydronic heating system (a system that heats with hot water or steam), you must set the thermostat to operate properly with your system. To change the setting, press and hold SET TIME and VIEW PRGM buttons at the same time until the correct setting is displayed (A for forced air; H for hydronic systems).

NOTE

If you do not press both buttons at the same time, A or H will not be displayed. If this happens, press RUN PRGM, then press and hold SET TIME and VIEW PRGM at the same time.

7904 specifications

The White Rodgers 7904 is a versatile and efficient thermostat designed for residential heating and cooling systems. Recognized for its user-friendly interface, the 7904 offers a range of features that enhance comfort while providing energy savings. The device primarily incorporates programmable settings, allowing homeowners to customize their heating and cooling schedules based on their daily routines. With four distinct program periods per day, users can set different temperatures for mornings, days, evenings, and nights, helping to optimize energy usage.

One of the standout technologies in the White Rodgers 7904 is its adaptive intelligent recovery feature. This smart technology learns how long it takes to reach desired temperatures, adjusting the system's start-up time accordingly. This ensures that the home is at the preferred temperature right when residents arrive, without wasting energy by heating or cooling the home too early or too late.

Another important aspect of the 7904 is its compatibility with various HVAC systems, including gas, oil, and electric heating, as well as heat pumps. This flexibility makes it an attractive option for a wide range of households. Moreover, the thermostat supports both single-stage and multi-stage heating and cooling systems, which further broadens its applicability.

The White Rodgers 7904 also features an easy-to-read LCD display that shows the current temperature settings, time, and system status. This intuitive interface simplifies operation, making it easy for anyone to program and adjust settings as needed. The device is backed by a durable design, ensuring longevity and reliability for years to come.

In addition to its programmable capabilities and smart recovery technology, the 7904 includes a built-in filter change reminder. This feature helps homeowners maintain their HVAC systems by notifying them when it's time to replace or clean filters, contributing to optimal system performance and indoor air quality.

Overall, the White Rodgers 7904 is a well-rounded thermostat that combines advanced technology with user-friendly features to provide efficient temperature management. Homeowners looking for a reliable solution to enhance comfort, save energy, and maintain HVAC systems will find the 7904 to be an excellent choice. Its flexibility and ease of use make it a popular option among many households.