Installation manual

11
Adjust
low fire.
Is low fire approximately
a 10° F temp rise?
Start up complete
Adjust
high fire.
Adjust
incoming gas
pressure.
Adjust Air Flow Switch
Lock unit into high fire.
Is incoming gas
pressure 7”?
Is high fire at least
a 70° temp rise?
Lock unit into low fire.
NOTE: The start up procedure should
be followed in the order outlined at
left. Failure to do so may result in
unit not performing properly. Follow
procedures to make adjustments.
These adjustments should be made
after Ventilation System has been
balanced.
To Adjust Air Flow Switch:
With heater in HEAT mode, slowly turn
air flow switch adjustment until air flow
light goes out on FSC. Then turn back
one half turn.
Setting Incoming Pressure:
Pressure must be measured at first “T”
in supply gas line before the first gas
valve.
Adjusting High Fire:
Remove wire #4 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.
Adjusting Low Fire:
Remove terminal #5 from the Maxitrol
amplifier. This will drive the valve into its
lowest position. Adjust the low fire by
turning the low fire bypass on the side of
the modulating valve for M511 and
M611 models. For MR212D, the low and
high fire are both inside the valve. Refer
to the included Maxitrol literature.
VIII.START-UP PROCEDURE
Yes
No
No
No
Yes
Yes