Chapter 5 STARTING AND OPERATING INSTRUCTIONS
5-2 750-177
1. FUEL SUPPLY
Before initial startup, verify that all fuel connections are tight.
Fuel supply lines should be securely connected, correctly
supported, and leak tested.
The gas train for gas-fired, or combination gas/oil, burners is
provided with the overall boiler package. Configuration of
the appropriate gas train is based on minimum requirements
established by Underwriter’s Laboratories / Canadian
Underwriter’s Laboratories (UL/cUL) and the responsible
insurance carrier if applicable (Figure 5-3 shows the
configuration of the gas train for various insurance
requirements).
The pilot gas train is supplied with the burner, and is factory-
installed. Figure 5-3 illustrates the pilot gas train
configuration.
Fuel oil piping for oil-fired systems is shown pictorially in
Figures 2-5 and 5-2. In this circuit, an oil supply line from the
oil tank is connected to the inlet port of the oil pump, and an
oil return line from the pump circulates excess oil from the
pump back to the oil supply tank.
!
DANGER
CAUTION
Oil circulation back to the tank is required at
all times. Do not start the burner with closed
stop valves in the return lines or serious
damage will occur
Cleaver-Brooks recommends that all oil firing burners be
equipped with an oil strainer (if not included with the burner)
to prevent particles from clogging the nozzle. It is essential to
follow the strainer manufacturer's maintenance schedule to
ensure proper filtration.
2. CONTROL SETTINGS - STEAM AND HOT
WATER
See Chapter 6 for adjustment instructions for the following
controls.
Inspect the operating limit control for proper setting.
1. The pressure control of a steam boiler should be set
slightly above the highest desired steam pressure, but at
least 10% lower than the setting of the safety valve.
2. The temperature control on a hot water boiler should be
set slightly above the highest desired water temperature
and within the limits of the pressure vessel.
Inspect the high limit control for proper setting.
Before burner startup, the two oil solenoid valves are in the
closed (de-energized) position and the oil metering valve is in
its most open position. Under this condition (with the pump
operating), oil cannot flow to the oil burner nozzle, but
circulates through the by-pass tubing, oil metering valve, and
back to the inlet of the pump. When the flame safeguard
control calls for the main flame, the two oil solenoid valves
are electrically energized. After opening, oil flows through
the nozzle at the low-fire flow rate.
When high-fire operation is required, the modulating motor,
by way of the valve linkage, rotates the oil metering valve to
its least-open position. This reduces the flow rate of oil
through the by-pass circuit, which increases the oil flow to the
burner nozzle.
Figure 5-1: Fan Motor
FAN MOTOR ROTATION
COUNTERCLOCKWISE
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