5
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 clean, low fire.
The high fire air shutter is not adjustable and moves with
the linkage that is preset at the factory.
* When field conditions are unusual or if the load requires it, the low fire and
high fire may be altered such that the low fire is increased and the high fire de-
creased as needed. The low lire air shutter adjusting screw will require turning
to the revised nozzle sizes.
*"A"–See Figs. 7 and 8, Page 4.
NOZZLE SPECIFICATIONS
The nozzles shown in Tables 5 and 6 are standard and
usually provide the best fire. Substitutions are not normally
recommended.
Other makes of nozzles may or may not prove satisfactory.
For special applications. other specifications might provide
a more desirable pattern.
FORCED DRAFT FIRING
Due to the back pressure in forced draft units the maxi-
mum firing rate of a burner is reduced. The greater the
pressure, the lower the maximum GPH capability becomes.
Table 7 shows this. Note that the Table stops at 0.50 inches
W.C.: the maximum recommended back pressure for these
models
.
The combustion head settings for forced draft firing would
be somewhat greater than those shown in Tables 5 and 6
which are for zero pressure or natural draft.
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 bot-
tom 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. The length of run should not exceed
100 ft. and the vacuum should not exceed 12" mercury
(5.9 PSI). Be sure the by-pass plug has been removed for
single-pipe systems.
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. The vacuum reading should not
exceed 12" mercury (5.9 PSI). For two-pipe installations the
by-pass plug must be installed.
Table 8 shows, for the standard two-stage fuel unit, the al-
lowable lift and lengths of 1/2" and 5/8" OD tubing for both
suction and return lines in two-pipe systems.
TABLE 5 701CRD
NOZZLE DATA AND COMBUSTION HEAD SETTINGS
Nozzle Specifications
Hago Products Corp.
Oil Delivery Rate
GPH @ 150 PSI
“A”*
Approximate
Retention
Ring Setting
On Scale
Low Fire
Air
Shutter
1st Stage
2nd Stage
Spray
Low Fire
High Fire
3.00
2.00
60°H
3.60
6.00
1/16"
1/8"
3.25
2.25
60°H
3.90
6.60
3/16"
1/8"
3.25
2.75
60°H
3.90
7.20
1/4"
1/8"
3.50
3.00
60°H
4.20
7.80
5/16"
1/4"
3.50
3.50
60°H
4.20
8.40
3/8"
1/4"
3.75
3.75
60°H
4.50
9.00
7/16"
3/8"
4.00
4.00
80°H
4.80
9.60
1/2"
1/2"
4.00
4.50
60°H
4.80
10.20
9/16"
1/2"
4.50
4.50
60°H
5.40
10.80
5/8"
5/8"
4.50
5.00
60°H
5.40
11.40
3/4"
3/8"
5.00
5.00
45°H
6.00
12.00
7/8"
3/4"
5.00
5.50
45°H
6.00
12.60
1
1
⁄
16
"
3/4"
5.00
6.00
45°H
6.00
13.20
1
1
⁄
4
"
3/4"
TABLE 6 801CRD
NOZZLE DATA AND COMBUSTION HEAD SETTINGS
Nozzle Specifications
Hago Products Corp.
Oil Delivery Rate
GPH @ 150 PSI
“A”*
Approximate
Retention
Ring Setting
On Scale
Low Fire
Air
Shutter
1st Stage
2nd Stage
Low Fire
High Fire
5.50
4.00
6.60
11.40
1/16"
1/4"
5.50
4.50
6.60
12.00
1/16"
1/4"
5.50
5.00
6.60
12.60
1/48"
1/4"
5.50
5.50
6.60
13.20
3/16"
1/4"
6.00
5.50
7.20
13.80
1/4"
3/8"
6.00
6.00
7.20
14.40
5/16"
3/8"
6.00
6.50
7.20
15.00
3/8"
3/8"
6.50
6.50
7.80
15.60
7/16"
1/2"
6.50
7.00
7.80
16.20
1/2"
1/2"
6.50
7.50
7.80
16.80
3/8"
1/2"
6.50
8.00
7.80
17.40
3/4"
1/2"
6.50
8.50
7.80
18.00
7/8"
1/2"
7.00
8.50
8.40
18.60
1"
5/8"
7.00
9.00
8.40
19.20
1
1
⁄
8
"
5/8"
7.00
9.50
8.40
19.80
1
1
⁄
4
"
5/8"
TABLE 7
MAXIMUM FIRING RATES (GPH)–FORCED DRAFT
Burner
Model
Combustion Chamber Pressure
0.00
0.10
0.20
0.30
0.40
0.50
INS.
W.C.
701CRD
13.20 12.70 12.30 11.80 11.30 10.90
801CRD
19.80 19.40 19.00 18.60 18.20 17.80
TABLE 8
MODEL 701CRD & MODEL 801CRD
TWO-STAGE UNITS–TWO-PIPE SYSTEMS (150 PSI)
Length of Tubing (feet)
Lift (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