Specifications

– 18 –
Check the incoming line voltage to match unit name-
plate rating. If voltage is over +10% of nameplate rating
or phase voltage unbalance is over 2%, notify contrac-
tor or the 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 appli-
cable) 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 work-
ing properly.
Turn Fan “on-off” switch to “off” position.
Make sure all manual gas shut-off valves are still in the
closed position.
Setting Pilot
NOTE: Adjust inlet gas pressure on supply line
where the regulator has been installed to match
rating plate on unit.
Connect D.C. voltmeter to pilot flame test jacks located
on flame safeguard relay.
Connect manometer to pilot test tee (if applicable).
Set all thermostats to call for heat. Set inlet ductstat (if
applicable) above outside air temperature.
Place run/test switch on the flame safeguard relay in the
“test” position at the appropriate time (if applicable).
Open first main gas shut-off valve slowly. The last main
gas shut-off valve before burner must remain closed at
this time. Reset high-low gas pressure switches (if ap-
plicable).
SECTION V – UNIT START-UP
Turn Fan and Heat-Off-On switches to the On position
and check rotation of burner and induced draft fans,
amps, and overload settings.
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. Open pilot gas shut-
off valve slowly.
Make sure that the combustion air and pilot gas pres-
sure is sufficient to provide instant ignition, a stable
flame, and flame signal. Cycle pilot several times to
insure reliability.
NOTE: Frequently the cause of pilot problems
relates to gas pressures that are too high and/or
air dampers that are closed too far. This causes a
fuel rich mixture.
NOTE: 3 or 4 trials may be needed to purge air
from pilot line.
Watch D.C. voltmeter carefully. The reading should be
steady and between 2.0 and 5.0 Volts D.C. If the read-
ing is too low, slowly turn the needle valve in or out until
satisfactory flame signal is obtained (See separate lit-
erature for testing of flame safeguard).
NOTE: Pilot regulator adjustment may be
necessary if the adjustment of the needle valve
does not yield the required flame signal.
With pilot now adjusted, you can now shut down the
burner by turning the Heat "on-off" switch to the "off"
position.
Setting Main Flame
Install one manometer at test port on the last tee of the
burner manifold and one at the relief door.
Place the Run/Test switch on the flame safeguard relay
to the Run position at the appropriate time (if appli-
cable).
Restart unit. After the pilot proves the main automatic
fuel valves will be energized. Slowly open the last gas
shut-off valve and the burner should light immediately.
CAUTION: If main flame does not light within a few
seconds after pilot flame is established, shut the
burner down and repeat steps. You may have to
eliminate air from the main gas line. The main gas
pressure and / or burner air setting may also need
to be readjusted.