Combustion Air - CleaverBrooks FLX Operation, Service And Parts Manual

Profire V Burner
LOW-HIGH-LOW MOD - LOW or 60% DAMPER PURGE

Combustion Air

A two
controlled by a two position,
spring
mechanical linkage. For 60%
damper purge a mechanical
stop is provided on the damper
to ensure sufficient air flow is
COMPONENTS
provided
DESCRIPTION:
Power to drive the actuator is
routed
switch and a remote located
modulating
actuator also contains a limit
switch which is used to actuate
the second stage of the oil
supply system. (see oil at right).
Damper is in its closed or low
fire position. For 60% damper
PRE-PURGE:
purge this would be against the
mechanical stop.
STARTUP,
Damper remains in its low fire
IGNITION:
starting position.
Damper is driven open in 30
seconds by the two position
actuator.
RUN,
burners will modulate from the
MODULATE:
low to high rate positions based
on the
modulating
selection of the low/auto switch.
Damper returns to its start
SHUT DOWN,
position
POST-PURGE:
second closure speed of the
mechanical actuator.
VARIATIONS:
None
750-177
blade damper is
Safety shut
return actuator with provided to initiate the flow of gas.
The primary is a diaphragm or
motorized type valve which have
delayed opening rates to prevent
an "in rush" of gas. A butterfly
during prepurge. type gas metering valve is linked
directly to the damper actuator
through a low/auto and provides gas flow metering
during the drive to the high
control. The position. A manually adjusted gas
regulator limits maximum firing
rate.
Valves are closed.
Valves open. To prevent a surge
the primary gas valve opens at a
slowed rate. Gas flow to the
manifold is metered based on the
butterfly valves low fire setting.
The gas valves remain in their
open
Low-High-Low begins it's travel to the high fire
position opening the gas metering
valve.
signal from the modulate from low to high as
control and the described in the combustion air
column.
On shut down all gas valves close
based on the 25 within 1 second. The butterfly
valve closes in 25 seconds with
the two position actuator.
None
Gas
Pressure Atomization:
safety shut off oil valves initiate the flow of oil
off valve(s) are
from the high pressure pump to the nozzle.
The oil pump has a built in solenoid controlled
two level pressure regulating system. Low and
high flow rates are set on the pump based on
pressure
rating.
The pump is operational but the valves are
closed. Oil is flowing through an internal relief
valve and returning to the supply system.
Safety shut off valves open allowing oil to flow
from pump to nozzle. Oil pressure at the nozzle
is based on the pump's low pressure setting.
Excess oil is flowing through an internal relief
valve and returning to the supply system.
The safety shut-off oil valves remain open. The
position. The actuator
pump's solenoid is energized by the auxiliary
switch within the damper actuator as it opens
the air damper. Oil pressure is then increased
The burner will then
based the pumps high pressure setting. The
burner will then modulate from low to high as
described in the combustion air column.
All valves immediately return to their startup or
de-energized position.
operating with post-purge, but oil is flowing
through an internal relief valve and returning to
the supply system.
For pumps without the internal dual pressure
solenoid an external pressure relief valve and
normally
used.
Oil
Two solenoid type
and the nozzle's
The oil pump
open solenoid valve
Chapter 2
flow
is
are
2-13