FloAire Indirect Fired Heater - Manual (Page 11)

11
Correct Pilot Fame
OPERATION
Prior to starting up or operating the heater, check all fasteners for tightness. In particular, check the set
screw in the wheel hub, bearings and the fan sheaves (pulleys). With power and gas to the heater OFF or
prior to connecting ventilator to power, turn the fan wheel by hand to be sure it is not striking the inlet or
any obstacles. Re-center if necessary.
Start Up
Special Tools Required
•
AC Voltage Meter
•
Tachometer
•
Standard hand Tools
•
Amperage Meter
•
Manometer
•
Thermometer
Start Up Procedure
1. Check all electrical connections for tightness and continuity.
2. Check pulley alignment and belt tension as described below.
3. Inspect the condition of the intake damper and damper linkage, if provided.
4. Inspect the air-stream for obstructions and install intake filters if missing.
5. Compare the supplied motor voltage with the fan’s nameplate motor voltage. If this does not
match, correct the problem.
6. Start the fan up, by turning the external disconnect to the ON position, and shut it OFF
immediately to check rotation of the wheel with the directional arrow on the blower scroll.
Reversed rotation will result in poor air performance, motor overloading and possible burnout.
For units equipped with a single-phase motor check the motor wiring diagram to change rotation.
For 3-phase motors, any two power leads can be interchanged to reverse motor direction.
7. When the fan is started up, observe the operation and check for any unusual noises.
Pilot Adjustment
1. Restart the fan and check the gas supply pressure at the inlet gas tap upstream of all electronic
valves. The inlet pressure should be 7 in. - 14 in. w.c. on natural gas and 11 in. – 14 in. w.c.
on propane gas. If the inlet pressure is too high, install an additional pressure regulator external
to the unit.
2. Open the field installed manual gas shut-off valve and the manual main
gas valve on the combination gas control valve.
3. Call for heat with the thermostat (turn set-point to temperature above
outside air) and allow the pilot to light. If the pilot does not light, purge
the pilot line. If air purging is required, disconnect the pilot line at the
outlet of the pilot valve. In no case should the gas line be purged into
the heat exchanger.
4. Check the pilot flame length and adjust according the correct pilot
flame diagram. Remove the burner access panel, (located on the
bottom of the furnace behind the valves) to access the burner and pilot
assembly. A short pilot flame can be caused by low gas pressure, or a
dirty pilot orifice. To adjust the pilot flame, remove the cap from the pilot
adjustment screw on the combination gas valve. Adjust the pilot length
longer by turning the screw counter-clockwise. Shorten the pilot flame
by turning the screw clockwise. The pilot flame should be 3/4” to 1” long
and encompass 3/8” to 1/2” of the tip of the flame sensing rod.
5. Once the pilot has been established, replace the burner access panel and open the main manual
gas shut-off valve downstream of the electronic valves. Check to make sure that the main gas
valve opens, and gas flows to the burner.