Applied Air GAS-FIRED HEATERS, Installation & Operation Instruction

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Before attempting to start the heater read and
understand the sequence of operations, electrical
schematic, gas train, burner, and fl ame safeguard
control.
WARNING: During installation, testing, servicing
and trouble shooting of this product, it
may necessary to work with live electrical
components. Have a qualified licensed
electrician or other individual who has been
properly trained in handling live electrical
components to perform these tasks. Failure to
follow all electrical safety precautions when
exposed to live electrical components could
result in death or serious injury.
Make sure all manual gas valves are closed.
Make sure all doors and service panels have been
closed or replaced.
Turn main disconnect switch off. Check the incoming line
voltage to match unit nameplate rating. If voltage is over
+10% of nameplate rating or phase voltage unbalance is
over 2%, notify contractor or power company.
If power supply meets requirements turn main
disconnect switch on. Turn Fan “on-off” switch to
“on” position. Inlet shut-off damper(s) (if applicable)
opens, after end switch has proven damper is open
the blowers or props run.
Turn Fan “on-off” switch to “off” position. Check
supply fans for proper rotation. The burner and
induced draft fan rotation can be checked when the
heat section is started.
NOTE: To change rotation of the fans, simply
interchange any two (2) of the line leads of the
motor starter for 3 phase motors. On single-phase
motors, refer to motor nameplate.
Turn Fan “on-off” switch to “on” position. Check for
proper fan RPM. Check that all amp draws do not
exceed nameplate ratings and overloads are set to
nameplate amps.
Check to make sure all dampers and controls are
working properly.
Turn Fan “on-off” switch to “off” position.
NOTE: When setting up the burner for the fi rst
time or if the appliance has been shut down for
an extended period of time, these same start up
procedures should be followed.
SECTION V – UNIT START-UP
WITHOUT DDC CONTROLS
Open pilot and fi rst main gas shut-off valves slowly .
Last main gas shut-off valve before the burner must
remain closed at this time. Reset high-low gas pressure
switches (if applicable). Check pilot and main gas lines
for leaks using soap solution.
Check the gas supply pressure by replacing the plug
fi tting on the pilot gas line with a pressure gauge with
appropriate range. Check that pressure reading is
within the specifi ed range on the raring plate.
NOTE: To adjust gas pressure on supply lines where
a regulator has been installed (to set inlet pressure
to rating plate maximum pressure), remove dust
cap of main gas regulator and turn adjusting screw
clockwise to increase pressure or counterclockwise
to decrease pressure.
Setting the Pilot Flame
CAUTION: Do not attempt to start the pilot when furnace
is full of vapor or combustion chamber is very hot.
CAUTION: At no time should you stand in front of
the relief door.
Honeywell Flame Safeguard Control (RE-02)
A keyboard display module (Honeywell #S7800A1142)
is recommended to read the fl ame signal, and is a good
troubleshooting device. A V.O.M. can also be used on the
D.C. voltage test jacks marked “+” and “-“ on fl ame amplifi er.
Connect manometer to pilot test tee (if applicable).
Set all thermostats to call for heat. Set inlet ductstat (if
applicable) above outside air temperature.
Turn Fan and Heat-Off-On switches to the On position
and check rotation of burner and induced draft fans,
amps, and overload settings. Make sure the damper
on the induced draft fan is approximately 75% open.
If limits and all safety controls are closed, the burner
and induced draft fan will run for 90 seconds before
ignition trial as a pre-purge cycle.
Place run/test switch on the fl ame safeguard relay in the
“test” position during P.F.E.P.