INSTALLATION

REMOVING THE OLD FLAME SENSOR

The 3049 flame sensors are manufactured with different termi- nal/panel configurations. Some models have three 1⁄4” spade terminals, while others have two 1⁄4” spade terminals and one pin terminal. Figure 5 illustrates the terminal layout and internal switch action for each variation.

The service technician must identify the terminal configuration on the existing sensor, and confirm that it matches the replace- ment. If the sensor terminals do not match, replacement cannot be made.

Before removing old flame sensor, perform the following:

1.On Type 3049 Flame Sensor - record the color code for each wire attached to the three quick-connect terminals and disconnect the wiring. Refer to Fig. 5 for terminal/panel configurations.

2.For both types of mercury flame sensors - inspect the pilot burner, flame sensor bulb, and the adaptors and clips used to hold the bulb within the pilot burner bracket. Note the exact arrangement of clips and adapters so that the same arrangement is used for the replacement flame sensor.

3.For both types of mercury flame sensors - note the exact location and mounting method for the ignition electrode attached to the pilot burner bracket or flame sensor bulb. This location must be used when the replacement flame sensor is installed. Failure to exactly locate the electrode will cause pilot ignition problems.

There are generally three styles of electrode mountings:

A.Electrode and pilot burner manufactured as a one- piece unit. In this case, electrode position should not be disturbed. The flame sensor bulb can be removed without disassembling the electrode.

B.Electrode mounted to the pilot burner via a perforated mounting strap. In most cases using the perforated mounting strap, the electrode will NOT be disturbed when the flame sensor is removed.

3⁄32" to 5⁄32"

Sensing Bulb

 

Element (push-in

Hood

type only)

3⁄32" to 5⁄32"

 

Clamp

Electrode

C.Electrode mounted using the bracket that attaches to the flame sensor bulb. In this case, the electrode must be removed before the bulb can be pulled from the pilot burner bracket.

4.Carefully remove the flame sensor bulb from the pilot burner bracket noting the positions of the adaptors and the ignition electrode.

5.For flame sensors with stud-mount sensing bulbs, remove the nut from the bulb stud and pull the sensing bulb down through the pilot burner.

INSTALLING THE REPLACEMENT FLAME SENSOR

1.Check the sensing bulb of the defective flame sensor and note the positions of any C-ring(s) installed on the bulb. If the replacement flame sensor does not have C-rings, remove the C-ring(s) from the old flame sensor and install in the same position on the new flame sensor bulb. Do not uncoil the new flame sensor capillary until it is ready to be installed.

2.Carefully uncoil enough capillary to allow installation of the new flame sensor. Do not kink or sharply bend the capillary to prevent damage.

3.Slip the bulb of the replacement flame sensor into the pilot burner bracket and secure it with the same method used for the defective flame sensor. The bulb should be held by the pilot burner so that movement from side to side is mini- mized.

4.If the ignition electrode was removed or changed position, reinstall it so that it is in its original position. The spark gap should be 3⁄32” minimum to 5⁄32” maximum from the tip of the electrode to the sensing bulb or pilot hood, depending on the original configuration.

5.Carefully uncoil enough capillary to install the switch mecha- nism on the same position as the original unit. Be sure to prevent excessive strain where the capillary enters the bulb.

6.Mount the switch mechanism (for plug-in types) plug flame sensor into gas valve socket.

7.For type 3049 flame sensors, attach the wires to their respective terminals.

8.Energize the system and observe the pilot burner and ignition electrode. Sparking should occur in the middle of the pilot gas stream.

Electrode Mounted

Electrode Mounted Using

With Slip-on Bracket

Perforated Strap

Figure 1

The maximum operating temperature as taken by thermocouples attached to the automatic pilot must not be more than shown.

Grooves for C-Ring(s)

1450°F

71-1139

26-0079 26-0080 69-1913

Pilot Burner Adaptors

NOTE: Part no. 71-1139 is for use with stud bulb type pilots

6-1662

Electrode

Mounting Bracket

500°F

Avoid Bends at This Point

Mercury Element

Figure 3

Figure 2

2

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White Rodgers 3049 Installation, Removing the OLD Flame Sensor, Installing the Replacement Flame Sensor, Mercury Element
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3098, 3049 specifications

The White Rodgers 3049 and 3098 series are advanced thermostat models designed for residential and commercial heating and cooling systems. These devices stand out for their user-friendly interfaces, energy-saving features, and robust performance, making them popular choices among homeowners and HVAC professionals alike.

One of the major features of both models is their digital display, which provides clear visibility of temperature settings and system statuses. The intuitive menus allow users to easily navigate settings for optimal comfort and efficiency. The backlit display further enhances usability, especially in low-light conditions.

Both the 3049 and 3098 models incorporate programmable scheduling capabilities, allowing users to set specific temperature preferences for different times of the day or week. This feature not only enhances comfort but also contributes to energy savings by reducing heating and cooling when the home is unoccupied. The ease of programming, coupled with the ability to override schedules temporarily, positions these thermostats as top choices for modern homes.

In terms of technology, the White Rodgers 3049 and 3098 deploy advanced algorithms for precise temperature control. They feature adaptive recovery, which learns how long it takes to heat or cool a space, ensuring that the desired temperature is reached by the programmed time. This leads to more efficient energy usage while maintaining comfort.

One distinguishing characteristic of these models is their compatibility with a wide range of heating and cooling systems, including gas, oil, and electric systems. They support both single-stage and multi-stage systems, allowing for flexibility in various home setups. Additionally, their robust construction ensures longevity, making them a wise investment for homeowners.

Another notable feature of the White Rodgers 3049 and 3098 is their ability to integrate with smart home systems. They can be connected to Wi-Fi networks, enabling remote access and control through mobile apps. This integration permits users to monitor and adjust their home’s heating and cooling systems from anywhere, further enhancing comfort and energy efficiency.

The White Rodgers 3049 and 3098 series represents a blend of functionality, technology, and ease of use, making them suitable for a variety of applications. Whether seeking simple temperature control or advanced energy-saving features, these thermostats fulfill diverse heating and cooling needs in today's smart homes.
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