Form 44201440
25
Oct 2018
INSTRUCTIONS FOR PRESSURE TEST GAUGE CONNECTION
INLET GAS PRESSURE CHECK
1.
The installer will provide a 1/8” N.P.T. tapped plug, accessible for test gauge connection immediately upstream
of the gas supply connection to the heater.
OUTLET GAS PRESSURE CHECK AND ADJUSTMENTS
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 are
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 to connect manometer hoses.
2.
Turn the pressure test screw (3/32” Hex) 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 1 below).
If regulator needs to be adjusted, see instructions below.
TO ADJUST REGULATOR (two stage gas valves):
1.
Turn on power and energize main gas valve solenoid. Do not energize the HI solenoid.
2.
Remove regulator cover screw from the low outlet pressure regulator (see Figure 1 below) and turn screw
clockwise
to increase pressure, or counterclockwise
to decrease pressure. Replace regulator cover
screw and tighten securely.
3.
Energize main gas valve solenoid as well as the HI terminal.
4.
Remove regulator cover screw from the high outlet pressure regulator (see Figure 1 below) and turn screw
clockwise
to increase pressure, or counterclockwise
to decrease pressure. Replace regulator cover
screw and tighten securely.
DO NOT EXCEED THE PRESSURES SHOWN IN THE GAS PRESSURE TABLE.
5.
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.
Summary of Contents for SGL35-L7
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