MUA-SVX01A-EN • Direct-Fired Make-up Air
45
Start-Up
Note: To adjust gas pressure on supply lines where a regulator has been
installed (to reduce the inlet pressure to 5 PSIG or less), remove dust cap
of main gas regulator and turn adjusting screw clockwise to increase
pressure or counterclockwise to decrease pressure.
2.
Connect test instrument to pilot flame test jack located on flame safeguard
relay.
3.
Set all thermostats to call for heat. Set inlet duct stat (if applicable) above
outside air temperature.
4.
Open pilot and first main gas shut-off valves slowly. Last main gas shut-off
valve before burner must remain closed at this time. Reset high-low gas
pressure switches (if applicable). Check pilot and main gas lines for leaks.
WARNING
Hazardous Gases
and Flamable
Vapors!
Exposure to hazardous gases from fuel substances have been shown to cause
cancer, birth defects or other reproductive harm. Improper installation,
adjustment, alteration, service or use of this product could cause flammable
mixtures. To avoid hazardous gases and flammable vapors follow proper
installation and set up of this product and all warnings as provided in this
manual. Failure to follow all instructions could result in death or serious injury.
5.
Turn FAN and HEAT-OFF-ON switches to ON position. Blower fan will run.
6.
Unit will run for 10-seconds before ignition trial, if all safety and limits are
made.
Note: Three or four trials may be needed to purge air from pilot line. If burner
has main flame rod or scanner, you may need to disable timer circuit.
Honeywell™ Flame Safeguard Control
Watch the DC voltmeter carefully. The reading should be steady and between 2.0
and 5.0 volts DC. If the reading is too low, slowly turn the needle valve in or out
until satisfactory readings are obtained. A keyboard display module (Honeywell
#S7800A1001) is recommended to read the flame signal, and is a good trouble
shooting device. A volt/ohm/meter (VOM) can also be used on the DC voltage test
jacks marked (+) and (-) on the flame amplifier.
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 and HEAT-
OFF-ON switches to OFF.
Setting Main Flame
1.
Install manometer at test port on the last tee of the burner manifold, or MR
valve test port.
2.
Slowly open all manual gas shut-off valves.
3.
Restart fan and burner. After "pilot proven", main gas valve opens and burner
lights.
