Carlin 201CRD Manual de instrucciones de instalación y funcionamiento - Página 8
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FUEL UNITS AND OIL LINES
Standard burners are provided
with single-stage 3450 rpm
fuel units with the by-pass plug removed for
single-pipe
installations.
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.
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 installations
the by-pass plug
must
be installed.
Table 5 shows, for the standard single-stage
fuel
unit,
the
allowable lift and lengths of Vi" and %" OD tubing for
both suction and
return
lines in
two-pipe
systems.
Table 5.
SINGLE-STAGE UNITS
—
TWO- PIPE SYSTEMS
(SUNDSTRAND JA2BB-100)
Lift
Length of Tubing (feet)
(feet)
W
0D
V%"
OD
0
100
100
2
100
100
4
84
100
6
66
100
8
48
100
10
30
83
When using the optional
two-stage
fuel
unit
a greater
amount
of lift is attainable
as
shown in Table 6.
Table 6. TWO-STAGE UNITS
—
TWO-PIPE SYSTEMS
(SUNDSTRAND H2PB-100)
Lift
Length of Tubing (feet)
(feet)
W
OD
Vt"
OD
0
100
100
2
88
100
4
78
100
6
69
100
8
59
100
10
49
100
12
39
100
14
29
82
15
24
68
a.
CARLIN COMPANY
912 SILAS DEANE HIGHWAY
WETHERSFIELD, CONNECTICUT
Form No. 202
Be sure that all
oil line connections
are
absolutely airtight.
Check all connections and joints. Flared fittings are recom¬
mended. Do
not
use
compression
fittings.
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.
LIGHT-OFF AND ADJUSTMENT
Before re-starting the burner,
preset
the air shutter and the
retention ring position for the
particular firing
rate ac¬
cording
to
Table 3 for 200CRD or Table 4, page 5, for
70ICRD.
If the fire is
a
little
too
rich, open the air shutter or move
the combustion head forward by increasing
dimension
"A," Fig.
13, page 5.
At the lower
inputs,
a
very slight
change is usually enough.
Adjust draft
to
0.0 1
to
0.03 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
0.01
to
0.03
inches
W. C. over the fire.
Check
CO2.
This should be over 10
percent,
and
will
often be over 12
percent,
in
a
well-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.
EFFECT OF BACK PRESSURE ON
MAXIMUM FIRING RATES
The maximum firing
range
for "CRD" models
(5.00
gph
for Model 200CRD
and 5.50 gph for
Model
201CRD)
is
based on operation with zero
to
slightly negative pressure
such as 0.01
to
0.03 inches W. C. draft over the fire
as
normally encountered in
a natural draft
unit.
When
a
unit is designed
for forced draft
operation with
a
positive
pressure
(back
pressure) over the fire, the maxi¬
mum
air capacity of the burner is reduced in
proportion
to
the
amount
of pressure. As
a
result, the
maximum firing
rate
is also reduced.
Fig. 14
shows the maximum firing
rate
in gph
of each model with various
amounts
of pressure
in the combustion chamber.
As an example, the Model 200CRD has
a
maximum
firing
rate
of just over 4.00 gph
when fired against
a
back
pressure
of 0.20 inches W. C.
Fig. 15
1
Q.
O
I
UJ
s
tr
o
z
tr
u.
X
<
2
Printed
in U.
S. A.
MODEL
201
CRO
MODEL
200
CRD
PRESSURE IN COMBUSTION CHAMBER
(INS. W.C.)
6