6
Light-Off and Adjustment
Before re-starting the burner, preset the air shutter and
the retention ring position for the particular firing rate
according to Table 2, page 5.
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 air or retention ring is made, reset
the draft to 0.02 to 0.04 inches W.C. over the fire.
Check C0
2
. This should be set between 11% and 12%.
Check for good ignition and clean cut-off. If cut-off
continues to be poor, look for air leaks in the suction
line and correct them.
Forced Draft Firing
Due to the back pressure in forced draft units the
maximum firing rate of a burner is reduced. The greater
the pressure, the lower the maximum GPH capability
becomes. Note that the graph at the right stops at 0.30
inches W.C. for Model 601CRD; the maximum recom-
mended back pressure for this model.
The combustion head settings for forced draft firing
would be somewhat greater than those shown in Table
2, page 5, which are for zero pressure or natural draft.
MN00000 111017
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T E C H S U P P O R T H O T L I N E 8 0 0 - 9 8 9 - 2 2 7 5
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126 Bailey Road North Haven, CT 06473 Phone 203–680–9401 Fax 203–764–1714
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visit our website:
www.carlincombustion.com
Fuel Units and Oil Lines
Standard burners are provided with a two-stage
3450 rpm fuel unit set at 150 psi.
A single-pipe system is recommended whenever the
bottom of the fuel tank is above the burner or is at the
same level as the burner. This includes outdoor fuel
tanks that are at such levels.
A two-pipe system is recommended when the fuel tank
is below the level of the burner, and the fuel unit must
pull (lift) the fuel up to the burner. For two-pipe instal-
lations, the by-pass plug must be installed. Maximum
recommended vacuum is 12 inches of mercury.
Table 3 shows, for the standard two-stage fuel unit, the
allowable lift and lengths of 1/2" and 5/8" OD tubing for
both suction and return lines in two-pipe systems.
Be sure that all oil line connections are absolutely
airtight. Check all connections and joints. Flared fittings
are recommended.
Do not use compression fittings
or teflon tape.
Open the air-bleed valve and start the burner. For clean
bleed, slip a 3/16" 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.
Table 3. Two-Stage Units – Two Pipe Systems
Lift
(feet)
Length of Tubing (feet)
1/2" OD 5/8" OD
0
2
4
6
8
10
12
14
15
100
88
78
69
59
49
39
29
24
100
100
100
100
100
100
100
82
68
