6
Be sure that all oil line connections are absolutely air
tight. Check all connections and joints. Flared fittings are
required. Do not use compression fittings.
Open the air-bleed valve and start the burner. For clean
bleed. slip a 1/16"" ID hose over the end of the bleed
valve and bleed into a container. Continue to bleed for 15
seconds after oil is free of air bubbles. Stop the burner and
close the bleed valve.
LIGHT-OFF AND ADJUSTMENT
NOTE: WHEN STARTING THIS BURNER THE FIRST TIME
OR AFTER CHANGING NOZZLES, THE FLAME
MAY GO OUT DURING THE SWING FROM LOW
TO HIGH. BE READY TO SHUT THE BURNER
DOWN JUST AFTER THE FLAME GOES OUT.
REPEAT THIS UNTIL THE AIR IS PURGED OUT OF
THE HIGH FIRE OIL LINE.
Before starting the burner, pre-set the retention ring posi-
tion for the particular firing rate according to Table 5 for the
701CRD or Table 6 forthe 8O1CRD.
If the fire is a little too rich, move the combustion head
forward by increasing dimension "A" (Fig. 7 and 8). At the
lower inputs, a very slight change is usually enough. DO
NOT ALTER THE LINKAGE. IT IS PRE-SET AT THE FAC-
TORY.
Model 701CRD is provided with a low fire air shutter ad-
justing screw. This adjusting limits the amount of shutter
closure which thereby increases or decreases the amount
of combustion air required for proper burning.
Model 801CRD is supplied with separate low fire and high
fire air shutters. The low fire air shutter has an adjusting
screw which should be adjusted to get a cIean, low fire.
The high fire air shutter is not adjustable and moves with
the linkage that is pre-set at the factory.
Adjust draft to 0.02 to 0.04 inches W.C. over the fire for
natural draft units.
Run a smoke test. Strive for zero or a trace. Each time
further adjustment of retention ring is made, reset the draft
to 0.02 to 0.04 inches W.C. over the fire.
Check CO
2
. This should be 12 to 12
1
⁄
2
percent, and will
often be over 13 percent, in a welI-sealed unit.
Check for good ignition and clean cut-off. If cut-off con-
tinues to be poor, look for air leaks in the suction line and
correct them.
For different boiler applications, it is sometimes necessary
to have the high-fire pull in earlier or later than normal dur-
ing the swing to achieve a smooth, cleaner transition.
If the swing from low-fire to high-fire is rough, i.e. bangs or
rumbles or is extremely smoky, the internal end switch of
the damper motor is possibly not set correctly. The high-
fire should pull in as the air shutter, NOT THE DAMPER
ARM, is about half way through its swing.
If the fire is lean all the way to high-fire, the high-fire valve
should be energized earlier. lf during the swing, the fire
gets very smoky, then cleans up again, the high-fire valve
should be energized later.
To adjust the damper end switch, remove the damper
motor cover. This will expose a white plastic gear with
notches. With the burner off, use the end of a small bladed
screwdriver inserted into one of the notches of the white
gear. Turn the gear one notch clockwise if a later pull-in is
required, or counter clockwise for an earlier pull-in.
The linkage between the damper motor arm and the air
shutter crank is set at the factory and should only need
adjustment if the damper motor or damper rod is replaced.
With the burner in high-fire. there should be minimal play in
the connecting rod.
WIRING FOR LOW-HIGH-LOW STEP
MODULATION
In order to take full advantage of the energy savings poten-
tial of these bumers they should be wired to operate with
low-high-low cycles. Hence the firing cycle would be much
longer by going from low to high to low once or several
times before shutting off.
In the following illustrations are two examples: 1. Water
Boiler. 2. Steam Boiler. ln each case, we have a limit circuit
which starts and stops the burner and a high fire control
which brings the high fire on and off.
Also, prewired and built into the burner is a manual high fire
switch which enables the installer or operator to hold the
burner on low fire if so desired.
Refer to the appropriate example for your installation.
Example: Water Boiler
Operating Range 170°-190°F
2. Set Safety Hi Limit: Cut in 200 / Cut out 21O
3. Set Operating Limit: Cut in 180 / Cut out 190
4. Set Hi Fire Control: Cut in 170 / Cut out 180
Operation:
1. Call for heat: cold start. Burner starts on low and goes to
high fire.
2. When the temperature rises to 130°F, the burner goes to
low fire.
3. If temperature drops to 170°, burner returns to high fire.
4. If temperature rises to 190°, burner shuts off.
NOTE: Since the calibrations on the limit controls are
seldom exact, it will be necessary to readjust the settings
during operation.
