CleaverBrooks profire q, Installation, Operation And Maintanance

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750-370
ProFire Q Series Manual 4-3
Adjustments
4.4.3 — Direct Spark Ignition Flame Adjustment
The ignition flame is regulated by adjusting the pressure setting of the main regulator and adjusting the butterfly valve
setting. Normal setting is 0.5” W.C. when the burner is on. The flame must be sufficient to be proven by the flame
detector.
Although it is possible to visibly adjust the size of the flame, obtain a proper DC volt or microamp reading of the flame
signal.
The flame safeguard amplifier has a meter jack for this purpose. At initial startup and during planned maintenance, test
the flame signal, burner turndown, and safety switch lockout.
4.4.4 — Main Gas Pressure Regulator
The gas pressure required at the burner manifold is the pressure that is required to fire the burner at its rated capacity. The gas
pressure regulator must be adjusted to achieve this pressure to assure full input. Refer to manufacturer's literature for regulator
adjustment.
4.4.5 — Low Gas Pressure Switch
Turn adjusting screw until indicator moves to a pressure setting slightly below the operating gas pressure. The control
will break a circuit if pressure is below this set point. The control should be finally adjusted to prevent operation with
low gas pressure, but not at a pressure so close to normal operating pressure that unnecessary shutdowns occur. The
switch must be manually reset after tripping. To reset, allow gas pressure to rise and press the manual reset button.
4.4.6 — High Gas Pressure Switch
Turn the adjusting screw until the indicator moves to a pressure setting slightly above the maximum operating gas
pressure. The control will break a circuit if pressure exceeds this value. The control should be adjusted to prevent
operation with excessive gas pressure, but not at a pressure so close to normal operating pressure that unnecessary
shutdowns occur.This switch must be manually reset after tripping. To reset, allow gas pressure to drop and press the
manual reset button.
4.4.7 — Gas Combustion Adjustment
After operating for a sufficient period of time to assure a warm boiler, make adjustments for most efficient
combustion.The gas ratio regulator or the butterfly gas valve directly controls the rate of flow. The low fire light-off
setting should be regarded as preliminary until proper gas pressure for high fire operation is established.
Determine the actual gas flow from a meter reading at high fire. With the butterfly valve open and with regulated gas
pressure set, the actual flow rate should be quite close to the required input. If corrections are necessary, increase or
decrease the gas pressure by adjusting the gas pressure regulator, following manufacturer's directions for regulator
adjustment.
When proper gas flow is obtained, take a flue gas analysis reading.
An ultra-violet flame sensor electrical spark interference test must be performed after final adjustment. See Section 4.3 of
this chapter for additional information.
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Warning