White Rodgers 921, 927, 922, 37E73A-918 Specification, Installation, Removing the OLD Control

SPECIFICATION

ELECTRICAL RATINGS:

Input and Frequency: 120 VAC, 60 Hz

Output Ratings:

Ignitor Load: 2 Amps maximum

Inducer Draft Motor: 3 Amps Full Load, 4 Amps Locked Rotor

Current: 0.2 Amps @ 120 VAC

Range of Regulation (Btu/Hr)

Minimum: 30,000 Maximum: 150,000

Pressure Regulator Setting: Factory set to 3.5” or 4.0” W.C. Adjustable 2.5” to 5.0” W.C.

1.0” Pressure Drop Capacitya

100,000 Btu/Hr

aBased on 1000 Btu/ft3, 0.64 specify gravity natural gas

Maximum Inlet Pressure: 1/2 PSI maximum

Ambient Temperature Rating:

32oF to 160oF (0oC to 70oC )

Automatic High Temperature Cutoff:

Single-Use Type, 185oF(82oC)

Prepurge Time: 5 Seconds

Ignitor Warm-up Time: 20 Seconds

Trial for Ignition Period: 4 Seconds

Inter-purge Time: 5 Seconds

Post-purge Time: 5 Seconds

Ignition Retries: 2 Retries; 3 Trials before lockout

Ignition Recycles: 2 Recycles, 3 Losses of flame before lockout

BODY CONFIGURATION:

Right angle with a 1/2” NPT inlet and a 1/2” inverted flare outlet

MOUNTING:

Limited Horizontal/Vertical

INSTALLATION

NOTE

1.This control must be installed or serviced only by a professional.

2.For your safety, this control is supplied with tamper resistant screws. Do not attempt to repair or adjust the control. If you experience problems, replace the control immediately. Continuing to use a damaged control could result in fire and/or explosion.

3.An odorant has been added to the gas to help you detect it. Before lighting, search for the odor of gas by sniffing at floor level around the water heater.

4.In some situations, the gas may lose its odor. To detect unodorized gas, you must have a gas detector, which can be purchased from your gas company. If you do not have a detector and have the slightest suspicion that gas may be present, get out of the house and call the gas company. DO NOT RELY TOTALLY ON YOUR NOSE.

REMOVING THE OLD CONTROL

1.Shut off the gas to the water heater

2.Turn off electrical power to the water heater.

3.Remove the two plastic wire connectors that plug into the bottom of the control. The connectors have latches which must be depressed. DO NOT FORCE THE CONNECTORS, DAMAGE TO THE WIRING MAY RESULT.

4.Shut off the water at the cold water inlet.

5.Connect a hose to the water heater drain cock. Drain the water to a nearby drain. Open a hot water faucet for faster draining.

6.Disconnect the gas line at the union (Figure 1). Remove the piping from the old control.

7.Remove the control by turning it counterclockwise ().

INSTALLING THE NEW CONTROL

All piping must comply with local and state ordinances or with the National Fuel Gas Code (ANSI Z223.1-NFPA 54), whichever applies.

2

Dirt or contamination in the gas line can block the control from operating creating a risk of explosion, injury, or death. To protect the control from dirt and contamination, a drip leg or sediment trap (see Figure 1) must be installed in the piping leading to the control.

1.Apply pipe compound to the male threads of the pipe that goes into the control, leaving the first two or three threads clean.

2.Install control in the tank. Turn clockwise (). Use a short piece of pipe to help in turning. Align the control so that the burner tube may be connected.

3.Make the main burner connection. Do not use pipe joint compound or Teflon tape.

4.Connect the gas line. Use new black iron pipe that has been properly reamed. If old pipe is used, be sure it is clean and free from rust and scale. Use pipe joint compound on male threads only. (Use pipe joint compound approved for natural and LP gas service.) Do not use TEFLON tape. Do not apply compound to the first two threads.

5.DO NOT use joint compound or tape on the union connection.

6.Make the electrical connections to the control. There are two plastic connectors that plug into the bottom of the control. The connectors are “keyed” so that they can only be inserted one way. Make sure that the connectors are properly aligned before attempting to insert. DO

NOT FORCE THE CONNECTORS; DAMAGE TO THE CONTROL WILL RESULT.

7.To fill the water heater with water:

a.Close the water heater drain valve by turning the handle to the right (clockwise). The drain valve is on the lower front of the water heater.

NOTE

The cold water supply valve must be left open when the water heater is in use.

b.Open the cold water supply valve to the water heater.

c.To ensure complete filling of the tank, let air exit by opening the nearest hot water faucet. Allow water to run until a constant flow is obtained. This will let air out of the water heater and the piping.