Pressure Regulator Adjustment

!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.

GAS SUPPLY		SHUT-OFF VALVE
PIPE		GROUND JOINT UNION
		GROUND JOINT UNION
TEE		INTELLI-VENT™
TEE		CONTROL

DRIP LEG (SEDIMET TRAP)

3" MINIMUM

(MANDATORY)

PIPE CAP

Figure 1. Typical gas connection

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

8.Open the gas shutoff valve.

9.BEFORE TURNING ON THE APPLIANCE, CHECK THE GAS LINES FOR LEAKS.

a.Use a soapy water solution. DO NOT test for gas leaks using a match or open flame.

b.Brush the soapy water solution on all gas pipes, joints, and fittings. Use care that excess solution does not enter the control’s plastic housing.

c.Check for bubbling soap. This means you have a leak. Turn OFF the gas and make the necessary repairs.

d.Turn on the gas and recheck for leaks. Repeat this process until you are sure the system is gas-tight. If repeated work on a part does not stop the leak, the part must be replaced.

e.Rinse off the soapy solution and wipe all the plumbing parts dry.

These controls are shipped from the factory with the regulator set as specified on the control label. Consult the appliance rating plate to ensure burner manifold pressure is as specified. If another outlet pressure is required, follow these steps.

NOTE

If a valve has been factory-adjusted for the 2.5 to 5 inches

W.C. range, it cannot be field-adjusted outside that range.

1.Turn off all electrical power to the system

2.These models have 1/8 NPT threaded taps. The outlet pressure tap plug will need to be removed and a separate hose fitting installed.

3.Attached a hose and manometer to the separate hose fitting which has been installed in place of the 1/8 NPT threaded tap.

4.Turn on system power and energize valve.

5.Remove regulator cover screw and turn regulator adjust

screw clockwise ( ) to increase pressure, or counterclockwise () to decrease pressure (see

INSTALLATION

fig. 3). Always adjust regulator to provide the correct pressure according to the original equipment manufacturer’s specifications listed on the appliance rating plate. Replace regulator cover screw.

6.Turn off all electrical power system to the system.

7.Remove manometer hose from outlet pressure tap.

8.Remove hose fitting and re-install the 1/8 NPT pressure tap plug. Tighten to 60 in-lb max.

9.Turn on electrical power to the system.

10.Turn on system power and energize valve.

11.Using a leak detection solution or soap suds, check for leaks at pressure boss screw or pressure tap plug. Bubbles forming indicate a leak. SHUT OFF GAS AND FIX ALL LEAKS IMMEDIATELY.

Outlet Pressure

Regulator Adjust

Tower

1/8 Threaded Outlet

Pressure Tap

37E Intelli-Vent™ Control

Outlet Pressure

Regulator Adjust

Tower

1/8 Threaded Outlet

Pressure Tap

36G Valve

Figure 2. Pressure port and regulator adjust locations

Regulator

Cover Screw

Plastic

Adjust Screw

Regulator

Spring

Figure 3

922, 921, 37E73A-918, 927 specifications

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