Adjustment; Pressure Regulator Adjustment - Emerson White-Rodgers 36H Series Installation Instructions Manual

PRESSURE REGULATOR

ADJUSTMENT

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
Natural Gas: T wo-Stage Models - Low outlet pres-
sure can be adjusted in the 1 to 3.5" W.C. range and
high outlet pressure can be adjusted in the 2.5 to 5"
range. The valve cannot be adjusted outside this
range and the high outlet pressure setting must
always be set at least 1.5" above the low outlet
pressure setting.
Single Stage Models - Outlet pressure can be ad-
justed in the 2.5" to 5" range. The valve cannot be
adjusted outside this range.
Low regulator cover screw
(two stage only)
Regulator adjust screw
Regulator spring
Pilot cover screw
Pilot gasket
Pilot adjust screw
Pilot outlet
Figure 9. Pressure 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. 9.
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.
Single stage and two stage
high regulator cover screw
Regulator adjust screw
Regulator spring
Outlet pressure tap
4. (2-stage only) Remove regulator cover screw
from the low outlet pressure regulator adjust
tower (fig. 9) and turn screw clockwise (
to increase pressure, or counterclockwise
( ) to decrease pressure. Always adjust
regulator according to original equipment
manufacture's specifications listed on the ap-
pliance 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. 9) and turn screw clockwise (
to increase pressure, or counterclockwise
( ) 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 soap suds,
check for leaks at pressure tap plug. Bubbles
forming indicate a leak. SHUT OFF GAS AND
FIX ALL LEAKS IMMEDIATELY.
PILOT FLAME ADJUSTMENT
If the pilot flame is low and does not engulf the
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 to sense "low" heat.
To adjust the pilot gas pressure, remove the cover
screw (See fig. 9). To REDUCE pilot pressure,
turn the pilot adjust screw (beneath the cover
screw) clockwise (
pressure, turn the pilot adjust screw counterclock-
wise ( ). Replace and tighten cover screw.
ADJUSTMENT
) . To INCREASE pilot
)
)
7