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Low regulator cover screw
(two stage only)
Regulator adjust screw
Regulator spring
Pilot cover screw
Pilot gasket
Pilot adjust screw
Regulator spring
Regulator adjust screw
Single stage and two stage
high regulator cover screw
Outlet pressure tap
Figure 5. Pressure Adjustment
ADJUSTMENT
OUTLET PRESSURE ADJUSTMENT
1. Turn off all electrical power to the system.
2. Remove plug and install hose barb fitting and manometer
to pressure tap on outlet end of valve. See fig. 5.
3. Turn on system power. Set thermostat to call for heat (low
stage for two-stage systems). Main burner should light.
Proceed to step 6 for single stage systems.
4. (2-stage only) Remove regulator cover screw from the
low outlet pressure regulator adjust tower (fig. 5) and turn
screw clockwise ( ) to increase pressure, or coun-
terclockwise ( ) to decrease pressure. Always adjust
regulator according to original equipment manufacture’s
specifications listed on the appliance rating plate. Replace
regulator cover screw.
5. (2-stage only) Set thermostat to call for high stage.
6. Remove regulator cover screw from the single stage or
high outlet pressure regulator adjust tower (fig. 5) and turn
screw clockwise ( ) to increase pressure, or coun-
terclockwise ( ) to decrease pressure. Always adjust
regulator according to original equipment manufacturer’s
specifications listed on the appliance rating plate. Replace
regulator cover screw.
7. Turn off all electrical power to the system.
8. Remove manometer hose and fitting from outlet pressure
tap.
9. Replace outlet pressure tap plug and tighten (clockwise
40-60 in-lb.)
10. Turn on system power and set thermostat to call
for heat.
11. Using a leak detection solution or soapsuds, check for
leaks at pressure tap plug. Bubbles forming indicate a leak.
SHUT OFF GAS AND FIX ALL LEAKS IMMEDIATELY.
PILOT FLAME ADJUSTMENT
(Models 36H3X and 36H6X only)
If the pilot frame is low and does not engulf the bulb of the
mercury flame sensor, the system will not energize the main
valve. If pilot gas pressure is too high, gas will sputter past the
ignition electrode, and may not ignite. High pilot gas pressure
may also cause the flame to lift off the burner, causing the
flame sensor bulb to sense “low” heat.
To adjust the pilot gas pressure, remove the cover screw (See
fig. 5). To REDUCE pilot pressure, turn the pilot adjust screw
(beneath the cover screw) clockwise ( ) . To INCREASE
pilot pressure, turn the pilot adjust screw counterclockwise (
). Replace and tighten cover screw.
For gas to gas conversion, consult your dealer for appropriate
conversion kit.
NOTE