Power Flame C Series Installation & Operation Manual page 23

and that there is no binding of the Linkage or Dampers. Make
certain the cast iron Linkage Return Weight (15) is secure on
its Linkage Arm (17).
*
Not shown in this depiction. See page 4, Figure 2.
Figure 25
Typical Oil Burner with Full Modulation Fuel/Air Control (Model C-O)
9 Return Pressure Tap
Oil
Solenoid
Valves
3
Nozzle
1
For Simplex Nozzle Use Alternate Connection
to Tee on Outside of Burner Instead of
Connection to Nozzle Adapter
CAUTION:
All field piped components must be mounted in
the proper location and proper direction of oil flow.
CAUTION:
Oil supply pressure to Burner Pump must not
exceed 3 PSI per NFPA Code.
10
1
2
MECHANICAL OPERATION: The Full Modulation system
uses a two-stage Oil Pump (2) with an internal bypass type
Oil Nozzle (See page 19, note 1). A Modulating Motor (4)
controls the positioning of the Air Dampers (6) and the
Modulating Oil Valve (5) in the nozzle return line through
mechanical linkage. A direct spark oil ignition system is
standard on typical oil burners (a gas pilot is standard on
Gas/Oil burners) at firing rates up to 45 GPH, with a spark
ignited gas pilot* to ignite the main oil flame above that point.
Certain insurance company codes could require the gas
pilot system on lower input sizes. At main flame light off the
normally closed Oil Valve (1) is energized, allowing oil to flow
to the Nozzle. The Modulating Oil Valve is adjusted to allow
a controlled amount of oil to bypass the Nozzle, which keeps
the pressure reduced to the nozzle for low fire light off. Nozzle
oil supply pressure is set by adjusting the Oil Pump pressure
regulator (7). Turn clock-wise to increase the pressure and
counter-clockwise to decrease the pressure to the nozzle. The
low fire nozzle pressures should be taken at the plugged Oil
Pump Gauge Port (8) and should be approximately 300 PSI
with pressure at the Nozzle Bypass Gauge Port (9) from 60
to 100 PSI, these pressures varying with nozzle size and
job conditions. A typical low fire oil flow setting on the
Modulating Oil Valve would be number 7, but will vary with
job conditions. After a brief period of time for the low fire
flame to stabilize, the Modulating Motor will drive the Fuel/Air
Metering Valve
Low Oil
Check Valve*
Pressure
Pressure
Switch ** 8
Gauge
Test Port
Nozzle Port
Oil Pump 2
Vacuum Gauge
Return Port
Inlet Port
4 6
8
9 7
Note 1
Component operational sequencing will vary with the specific Flame
Safeguard Control being used. Refer to the specific Flame Safeguard
Control bulletin supplied with the burner for complete information.
5
Optional Return Port
/ " Allen Screw For Oil Nozzle,
1
8
Pressure Adjustment Under
7
Cap
Field Piped
Filter*
Inlet Port
Fusible Link
Valve (If Required
by Code)*
Check Valve*
Field Piped
Linkage (10) to the high fire position. At this point the Air
Dampers will be full open (or as required for good
combustion) and the Modulating Oil Valve will be at the
closed position and the nozzle bypass line will be fully
closed, putting full oil pressure to the Nozzle. The Oil
Pump Pressure Gauge Port pressure reading will show
approximately 300 PSI and pressures at the bypass
10
pressure gauge port will be 180 to 225 PSI, although this
will vary with the specific nozzle size being used. Refer
5
to page 34, Table 9 to determine specific nozzle pressures
and firing rates. A modulating temperature or pressure
controller will now modulate the firing rate to match the
load demand of the system, while maintaining proper
fuel/air ratios. Prior to reaching the system pressure or
temperature operating control cut off point, the burner
should be at or near the low fire operating position. At
the end of the firing cycle, the normally closed Oil Valve
will be de-energized and the Modulating Motor will
position the Air Dampers and Modulating Valve to the low
fire position, ready for the next start up sequence. This
depiction shows the Linkage in the low fire light off position.
See page 22, Figure 27 for linkage adjustment information.
Also see page 22, Figure 28 for information on the
Varicam TM modulating characterized fuel metering system.
*
Not shown in this depiction. See page 4, Figure 3.
Note 1
Some modulating Low-High-Off and Low-High-Low burners will
be supplied with simplex, rather than internal bypass type, oil
nozzles. The mechanical operation of the simplex nozzle system
is essentially the same as the internal bypass system - except that
low fire oil pressures should be set at 100 to 125 psig (adjust to
suit job conditions) and high fire oil pressures at 280 to 300 psig
at the oil pump nozzle pressure gauge test port. Refer to the
Burner Specification sheet shipped with the burner and/or page
34, Table 9 for high fire oil pressures and flow rates.
The oil pump depicted in the oil flow schematic above is as
manufactured by Webster Electric Company Inc. If the pump
on your burner is not Webster, refer to the oil pump bulletin
shipped with the burner for specific adjustment information.
Also see page 12, Figure 11.
Note 2
Component operational sequencing will vary with the specific
Flame Safeguard Control being used. Refer to the specific
Flame Safeguard Control bulletin supplied with the burner for
complete information.
* By Others Unless Specified
on Order.
** Burners with Remote Pressure
Atomizing Oil Pumps require a
Low Oil Pressure Switch.
DO NOT USE TEFLON TAPE
Inlet
Check Valve
Shutoff
(At Tank)*
Valve*
Return to
Tank
C21
Rev.304