An adjustment of the pressure regulator is not normally necessary
since it is preset at the factory. It may need to be adjusted,
however, to maximize the combustion efficiency of the equipment...
Figure 7
STOP and follow warning instructions.
Failure to do so may result in fire or explosion.
4. Move selector arm to the On position, and set room
thermostat to desired temperature. Allow burner
to cycle on and off.
5. Leak test with a soap solution after installing with
main burner on. Coat pipe and tubing joints,
gasket, etc. with soap solution. Bubbles indicate
leaks.
6. Replace burner access panel.
Pressure Regulator Adjustments
An adjustment of the pressure regulator is not normally
necessary since it is preset at the factory. It may need
to be adjusted, however, to maximize the combustion
efficiency of the equipment. (Note: manometer attachment
may be accomplished at pressure tap plug, above
control outlet, as shown in Figure 7. It is also a good
idea to measure inlet pressure at the tap on the other
side of the valve). Field adjustment may be accomplished
as follows:
1. Manometer or gauge attachments may be
accomplished at pressure tap plug (D).
2. Remove regulator adjustment screw cap (top of
control-A).
3. With small screwdriver, rotate adjustment screw
(B) clockwise to increase, or counterclockwise to
decrease, pressure to comply
with manufacturer’s
specifications.
4. Replace regulator adjustment
screw cap (A).
Regulator Conversion
Caution: main burner and pilot orifices
must be changed when regulator
is converted from one type of gas
to another.
1. Turn off gas and electricity to
appliance.
2. Remove slotted cap (A), adjusting
screw (B) and natural gas
spring—not color-coded—(C), from
control.
3. Install new LP spring—color-coded
with a black strip.
4. Install new adjusting screw (B).
5. Attach manometer or pressure
gauge at the outlet pressure tap
(D).
6. Turn gas and electricity on.
7. Turn room thermostat to call for heat.
8. With burner on, adjust screw (B) to supply LP gas
to pressure as recommended by the appliance
manufacturer.
9. If adjusting screw (B) reaches its maximum depth
(bottoms out) before recommended pressure setting
is reached, turn screw counterclockwise until pres-
sure drops slightly (approximately 0.1" WC)
WARNING: do not stretch or alter spring.
10. Turn off gas and electricity to appliance.
11. Remove manometer or pressure gauge and
reinstall pressure tap outlet plug (D).
12. Install new red slotted cap in place of (A).
13. Turn gas and electricity On.
14. With burner operating, immediately check all
fittings for leaks with soap solution. Bubbles
indicate leaks that must be corrected.
15. Conduct a combustion test on the equipment to
determine safe and efficient firing of the
equipment.
16. Attach label to show control has been converted
to LP.
17. Set room thermostat to desired temperature. ICM
Timmie M. McElwain is President of Gas Appliance Service,
which provides training for those servicing gas combustion equipment.
He is a certified instructor and test proctor for the Propane
Gas Association in their CETP program.
ICM/March/April 2021 19