User Manual

Form #43219020

Sept 2012

2. With the main burner operating, check the burner manifold pressure using a water manometer. Gauges

that measure pressure in pounds per square inch are not accurate enough to measure or set the

manifold pressure. Use a water manometer or a gauge calibrated in inches of water column. All

measurements MUST BE made when this heater and all other gas burning equipment that is connected

to the gas supply system are operating at maximum capacity.

3. The combination gas valve is factory set and should not require adjustment. If full rate adjustment is

required, remove the cover screw. Using a small screwdriver, turn the adjustment screw clockwise  to

increase or counterclockwise  to decrease the gas pressure to the burner. Replace the cover screw.

OUTLET GAS PRESSURE CHECK AND ADJUSTMENTS (WHITE-RODGERS 1 STAGE) GAS

VALVES

Gauges that measure pressure in pounds per square inch are not accurate enough to measure or set the

manifold pressure. All measurements MUST BE made when the heater and all other gas burning equipment

that is connectied to the gas supply system are operating at maximum capacity. The combination gas valve

is factory set and should not need adjustment. If gas pressure adjustment is required, follow the instructions:

1. Turn off all electrical power to the system prior to connecting manometer hoses.

2. Turn the outlet pressure boss test screw (3/32” Hex allen wrench plug) in the center of the boss not

more than one turn counterclockwise. Attach a 5/16” hose and manometer over the tapered outlet

pressure boss on the valve (see figure below). If regulator needs to be adjusted, see instructions below.

To Adjust Regulator (1-stage gas valves):

1. Turn on power and energize the main gas valve. Remove regulator cover screw (see figure below). Turn

regulator adjustment screw clockwise  to increase presure, or counterclockwise  to decrease

pressure. Replace regulator cover screw and tighten securely.

DO NOT EXCEED THE PRESSURES SHOWN IN THE GAS PRESSURE TABLE.

2. After testing pressure and adjusting the regulator, turn off all electrical power to the system, remove

manometer hoses, turn outlet test screw (3/32” Hex) clockwise to seal pressure port. Tighten to 7 in lb

minimum. Turn on system power.

Model Suffix 5D