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Honeywell Flame Safeguard Control
Watch D.C. voltmeter carefully. The reading should be
steady and between 2.0 to 5.0 volts D.C. If the reading
is too low, slowly turn the needle valve in or out until
satisfactory readings are obtained.
NOTE: Pilot regulator adjustment may be needed if
the adjustment of the needle valve does not yield
the required reading.
When pilot is adjusted, shut the burner off by turning
the Fan-Off-On switch to Off.
Setting Main Flame
Install manometer at test port on the last tee of the
burner manifold, or MR valve test port.
Slowly open all manual gas shut-off valves.
Restart burner. After “pilot proven”, main gas valve
opens and burner lights.
Adjust high gas pressure reading (from manometer) to
match firing rate shown on unit nameplate first.
Refer to Maxitrol Valve Adjustment instructions in
Section IX for setting high and low fire gas pres-
sure settings.
Adjust the high fire setting according to the Maxitrol
Valve Adjustment instructions in Section IX. The high
fire setting must not exceed the pressure stated on
the specification plate.
When adjusting low fire, there should be a continuous
flame along the entire burner length without any
blowout spots. Main burner flame sensor must be
activated, if applicable.
Check pilot and main gas lines for leaks.
Main flame is now set. Make sure burner modulates
and turn thermostat to the desired setting.
Cycle pilot and burner a number of times to insure
smooth light off.
Check flame signal with burner cycling through full firing
range and burner profile damper operation (if applicable).
Unit Start-Up: Systems without Pilot
Setting Burner
NOTE: To adjust gas pressure on supply lines
where a regulator has been installed (to reduce the
inlet pressure to 1/2 PSIG or less), remove dust
cap of main gas regulator and turn adjusting screw
clockwise to increase pressure, or counter-clock-
wise to decrease pressure.
Set all thermostats to call for heat. Set inlet ductstat
(if applicable) above outside air temperature.
Connect a DC microammeter between the SENSE
terminal and the flame rod sensing wire.
Turn Fan and Heat OFF/ON switches to ON position.
Open inlet manual gas shut-off valve slowly. Reset
high and (if applicable) low gas pressure switches.
Check main gas line for leaks using soap solution.
Unit will run for 5 seconds before ignition trial.
NOTE: 3 OR 4 TRIALS MAY BE NEEDED TO
PURGE AIR FROM GAS LINE.
United Technologies Electronic Controls
Spark Ignitor
Watch microammeter carefully. The reading should be
at least 5.0 microamps. If the reading is too low,
slowly turn the low-fire adjustment on the modulating
valve in or out until satisfactory readings are obtained.
When adjusting low fire, there should be a continuous
flame along the entire burner length without any
blowout spots.
Refer to Maxitrol Valve Adjustment instructions
in Section IX for setting high and low fire gas
pressure settings.
When the flame is adjusted, shut the unit off by turning
the Fan and Heat switches to OFF.
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