Cleaver-Brooks Profire E Series, Установка, эксплуатация и обслуживание, Страница: 48 / 84

Adjustments
4-4
750-297
Profire E/LNE Series Manual
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 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.
With the high fire air-fuel ratio established, the gas pressure regulator needs no further adjusting.
Recheck low fire and adjust if necessary.
Proper setting of the air-fuel ratios at all rates must be determined by combustion analysis. See Section 4.2 of this
chapter for additional information.
4.5 — Oil System
4.5.1 — Oil Metering System
Fuel oil supply to the separate metering unit must be 10 psi to 20 psi. The oil spray should ignite as soon as the oil
solenoid valve opens. If the oil spray fails to ignite, move the metering unit adjustment lever a few degrees
counterclockwise. This increases the amount of oil at low fire and makes ignition easier, it will also increase the oil on
high fire, and this must be checked later. Once adjusted, the pump should operate with a minimum amount of
adjustment. If a burner failure is caused by the oil metering pump, check the following:
1.
Oil tanks are not empty.
2.
All oil valves between the burner and the tank are open.
3.
The suction line is not airbound.
4.
The low fire setting has not been disturbed.
5.
There is pressure at the separate metering unit, but not exceeding 20 psi.
6.
The pump turns freely.
7.
The strainer at the suction side of the circulating pump is not clogged.
8.
The burner strainer is not dirty.
NOTE: Check for CO through the entire firing range.