User guide

13
Adjust pilot flame.
Lock unit into
high fire.
Adjust
incoming gas
pressure.
Is there 3.5" w.c. (10"
w.c. propane) max.
manifold pressure or at
least a 50°F temp rise?
Adjust high fire
No
Lock unit into low fire.
Yes
Is there .56" w.c.
(1.6" w.c. propane)
manifold pressure or
approximately a 30°F
temp rise?
Adjust low
fire.
Setting incoming pressure:
Presure must be measured at first "T" in
supply gas line before the first gas valve.
Adjusting the pilot:
The pilot flame should be 3/4" to 1" long
and encompass 3/8" to 1/2" of the tip of
the flame sensing rod.
Adjusting high fire:
High fire manifold pressure should be
3.5" for natural gas and 10" for propane.
High fire should produce at least a 50°F
temperature rise. Remove wire #3 from
the Maxitrol amplifier. This will drive the
valve into its full open position. Adjust
high fire with the regulator inside the unit.
Turn clockwise to increase temperature
rise. Replace wire #3 on the Maxitrol
Amplifier.
Adjusting low fire:
Low fire manifold pressure shoudl be .56"
for natural gas and 1.6" for propane. Low
fire should produce about a 30°F
temperature rise. Move wire from
terminal #11 to terminal #10 on the
maxitrol amplifier. Place jumper between
terminals #3 and #4 on the amplifier.
This will drive the valve into its lowest
position. Adjust the low fire by turning the
low fire bypass screw (small screw under
cap on Maxitrol Valve) on the top of the
modulating valve. Refer to the included
Maxitrol literature for more detailed
information.
Yes
No
No
Furnace start up
complete.
Yes
Is incoming gas pressure
7"-14"?(11"-14" for LP)
Furnace Start Up Summary