Installation, Removing OLD Control | White Rodgers 37C73U specification

INSTALLATION

REPLACEMENT INFORMATION

REMOVING OLD CONTROL

1.Shut off gas to water heater.

2.Shut off water at cold water inlet.

3.Connect hose to heater drain cock. Drain water to a nearby drain. Open a hot water faucet for faster drain- ing.

4.Disconnect gas line at union (figure 1). Remove piping from old control.

5.Disconnect the:

a.Thermocouple (left side).

b.Pilot burner (small tube on the right side)

c.Main burner (large tube in the middle).

6.Remove the control by turning it counterclockwise

( ). If needed, a short piece of 1/2” black iron pipe can be screwed into the control inlet to increase lever- age.

SPECIAL INSTALLATION NOTE

If replacing a Unitrol or Robertshaw control, install exten- sion adaptor fitting provided into the outlet of the control.

Gas supply pipe

Gas shut-off

valve

Union

(metal-to-metal)

Tee

Drip leg

(sediment trap)

Pipe cap

					PI
					LIG	LO
					LIG	T
					HTI
						N
						G
R	Y	T		HOTTER
E	O		WATER
V	H		WITH	INCREASES		L
C			SCALDING			O
			CAUTION:			W
B
			A

To pilot burner

To main burner To thermocouple

If replacing a control with 3/8" NPT outlet, install small adaptor fitting provided into the outlet of the control.

INSTALLING 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.

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/contamination, a drip leg or sediment trap (see Figure 1) must be installed in the piping leading to the control.

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

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

3.Make burner, pilot, and thermocouple connections. Do not use pipe joint compound or teflon tape. Thermo- couple nut should be hand tightened and then turned an additional 1/4 turn with a small wrench. DO NOT OVER-

TIGHTEN.

4.Connect 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 a pipe joint compound approved for natural gas service.) Do not use TEFLON tape. Do not apply compound to first two threads.

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

Figure 1. Typical gas connection

6.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.

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

NOTE

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

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.

d.Check all new water piping for leaks. Repair as needed.

!CAUTION

Never use this water heater unless it is completely filled with water. To prevent damage to the tank, the tank must be filled with water. Water must flow from the hot water faucet before turning ON gas to the water heater.

7. Open gas shutoff valve.

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.

One of the main features of the 37C73U is its digital display, which provides clear and intuitive navigation through its various settings. Users can effortlessly program their heating and cooling schedules according to their daily routines, ensuring that their home environment remains comfortable without unnecessary energy expenditure. The thermostat can typically be programmed for multiple time periods throughout the day, allowing for customized climate control that accommodates both personal preferences and efficiency.

The 37C73U employs proprietary adaptive recovery technology, which learns the household's heating and cooling patterns over time. This feature ensures that the desired temperature is met at the right time, preventing overuse of the heating or cooling system while promoting energy savings. By anticipating user needs, the thermostat optimally balances comfort and efficiency.

Another notable characteristic of the White Rodgers 37C73U is its compatibility with a variety of HVAC systems, including conventional forced air, heat pumps, and even some electric baseboard systems. This flexibility allows for widespread use across different home setups, facilitating easier installations and upgrades.

The thermostat also offers features such as filter change reminders and temperature holds, which further enhance its usability. The filter change reminder ensures that homeowners maintain their HVAC systems effectively by keeping track of when filters need replacement, ultimately improving air quality and system efficiency. The temperature hold feature allows users to temporarily adjust the temperature without altering the programmed schedule, providing added convenience during unexpected changes in occupancy or plans.

With its sleek design and straightforward interface, the White Rodgers 37C73U appeals to both tech-savvy users and those who prefer simplicity. It combines thoughtful engineering with practical features, making it a great choice for anyone looking to improve their home's climate control while reducing energy bills. The White Rodgers 37C73U stands out in the competitive thermostat market for its reliability, efficiency, and functionality, catering to the needs of modern homeowners.