To Light Appliance

GAS

CONTROL

KNOB

TEMPERATURE

POINTER

WATER

TEMPERATURE

DIAL

FIGURE A		FIGURE B		FIGURE C
O	N	O	N	O	N
F	N	F	N	F	N
F	O	F	O	F	O
PILOT		PILOT		PILOT
“OFF” POSITION		“PILOT” POSITION		“ON” POSITION

B.Gas Valve/Thermostat with ignitor.

MAIN BURNER

PILOT THERMOCOUPLE

FIGURE D

Figure 2. Gas Control Knob and

Water Temperature Dial

A.Gas valve/thermostat without ignitor (If control has an ignitor, proceed to Section B).

1.Set control to lowest setting by turning the water

temperature dial clockwise () to the "PILOT LIGHTING" position. DO NOT FORCE.

2.Turn gas control knob clockwise to "OFF". See figure A.

NOTE: Gas control knob must be depressed slightly to turn from "PILOT" to "OFF". Do not use tools or excessive force.

3.Wait at least five (5) minutes to clear out any gas, and then smell around the appliance area. If you smell gas,

STOP! Follow instructions "What to do if you smell gas" on the first page of this instruction sheet. If you do not detect gas, continue with the next step.

4.Remove inner and outer burner doors located on the water heater under gas control unit.

5.Find pilot – follow small metal tubes from gas control. The pilot is located near the main burner. See figure D.

6.Turn gas control knob counterclockwise to "PILOT". See figure B.

7.Depress control knob all the way and hold down. Im- mediately light the pilot with a match. Continue to hold knob down for approximately one (1) minute after pilot is lit. Release knob and it will pop back up. Pilot should remain lit. If pilot goes out, repeat steps 2, 3, 6 and 7.

•If knob does not pop up when released, turn knob clockwise to "OFF". STOP and immediately call your service technician or gas supplier.

•If the pilot will not stay lit after several tries, turn gas control knob to "OFF" and call your service technician or gas supplier.

8.Replace inner and outer burner doors.

9.At arm's length away, turn gas control knob counter- clockwise to the full "ON" position, FIGURE C.

10.Align the water temperature dial mark () with the temperature pointer on the cover. This mark, indicative of approximately 120oF, is the preferred starting point. If hotter water is desired, see TEMPERATURE REGU- LATION on page 4.

11.Check for leaks at the pilot and main burner fittings on the gas control with the main burner firing. Use a soapy water solution. If a leak is detected, turn the gas supply off and make repairs.

1. STOP! Read the safety information on the label.

2.Set the thermostat to lowest setting (PILOT LIGHT-

ING). Turn thermostat dial fully clockwise () until it stops.

3.Push the gas control knob down slightly and turn

clockwise () to "OFF", see FIGURE A. NOTE: Knob CANNOT be turned from "PILOT" to OFF" unless it is pushed down slightly. Do not force.

4.Remove the outer burner door located below the gas control.

5.Wait five (5) minuted to clear our any gas. If you then smell gas, STOP! Follow instructions "What to do if you smell gas" on the first page of this instruction sheet. If you do not detect gas, continue with the next step.

6.This unit is equipped with a push button pilot ignitor, which is used to light the pilot. Locate the ignitor on the gas control.

7.Turn gas control knob counterclockwise () to "PILOT", see FIGURE B.

8.The pilot is located on the right side of the burner. It can be located by looking through the glass view port while pressing the piezo ignitor button several times. Look for a spark at the pilot location, FIGURE D.

9.Once the pilot has been found, push the gas knob all the way down. Immediately press the pilot ignitor but- ton rapidly 4 to 5 times. If the pilot will not light, repeat step 3 through 9.

10.Continue to hold the gas control knob down for about one (1) minute after the pilot is lit. Release the gas control knob and it will pop back up. Pilot should remain lit. If it goes out, repeat step 3 through 9. It may take several minutes for air to clear the lines before the pilot will light.

•If the pilot does not pop up when released, stop and immediately call your service technician or gas supplier.

•If the pilot will not stay lit after several tries, turn

the gas control knob clockwise () to "OFF" and call your service technician or gas supplier.

11.Once the pilot flame is established replace the outer burner door.

12.At arms length away, turn gas control knob counter-

clockwise () to "ON". See FIGURE C.

13.Set the thermostat to desired setting. See TEMPERA- TURE REGULATION on page 4.

37C73U, 37C73U specifications

The White Rodgers 37C73U is a versatile and highly-regarded programmable thermostat designed to optimize energy usage while ensuring maximum comfort in residential heating and cooling systems. This device represents a fusion of advanced technology and user-friendly design, making it a preferred choice for many homeowners.

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