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.
Start Up
Special Tools Required
• | AC Voltage Meter | • | Amperage Meter |
• | Tachometer | • | Manometer |
• | Standard Hand Tools | • | Differential Pressure Gauge |
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
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
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 | Pilot Assembly |
should be 7 in. - 14 in. w.c. ( 7 in. w.c. – 5 psi on Size |
|
heaters). If the inlet pressure is too high, install an additional |
|
pressure regulator external to the unit. |
|
2.Open the field installed manual gas
3.Call for heat with the intake air thermostat (turn
4.Check the pilot flame voltage at the Flame Safety Control interface test jacks. A weak 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. Increase the pilot gas flow by turning the screw
5.Once the pilot has been established, open the main manual gas
11