6
•
When communicating with outdoors by means of vertical ducts,
each opening shall have a free area of not less than one square
inch per 4,000 Btu per hour (551 mm
2
/kW) (35 square inches
per gallon of oil consumed per hour) of total input rating of
all appliances in the enclosure.
•
If horizontal ducts are used, each opening shall have a free
area of not less than one square inch per 2,000 Btu per hour
( 1 , 1 0 1 m m
2
/ k W ) ( 7 0 s q u a r e i n c h e s p e r g a l l o n o f o i l
consumed per hour) of total input of all appliances in the
enclosure, fig. 6.
FIGURE 6
FLUE GAS VENTING
In the absence of any local codes, regulations, or vent pipe or chimney
manufacturer's recommendations, for oil fired equipment, follow the
suggestions below for designing and installing a venting system.
For these water heaters, it is recommended that an adequate
chimney be used for venting the flue gases. Type B, double wall,
vent pipe should be used as the vent connector pipe. However,
where no chimney is available, vent pipe may be used to construct
a vent.
Where an existing chimney or vent is to be used, be sure that the
chimney or vent has adequate capacity for the number and
sizes of appliances being vented through it. Inspect the chimney
or vent and remove all soot or other obstructions which will retard
free draft.
VENT CONNECTOR AND DRAFT REGULATOR
The chimney or vent connector diameter should be the same size as the
heater flue outlet, see Table 4. A minimum rise of 1/4" per foot
(21 mm/M) of horizontal connector length must be maintained between
the heater and chimney opening, fig. 7. The connector length should be
kept as short as possible.
TABLE 4 SUGGESTED VENT CONNECTOR SIZES
Outlet Diameter
Model Number
Inches
( m m )
COF-199*
6
152.4
COF-245
8
203.2
COF-315/315A
8
203.2
COF-385/385A
8
203.2
COF-455/455A
8
203.2
COF-700/700A
10
254
*
These models are factory supplied with a flue reducer which
should be installed on the top cover.
In venting systems where a continuous or intermittent back
(positive) draft is found to exist, the cause must be determined
and corrected. In some cases, a special vent cap may be
required.
If the back draft cannot be corrected by normal methods or if a
suitable draft cannot be obtained, additional make up air must be
provided to the room to assure proper venting and combustion.
Note: A negative draft must be maintained in the vent piping.
The barometric draft regulator must be installed in the same room as
the heater, fig. 6. Locate the regulator as close as possible to the
heater and at least 18" (452 mm) from a combustible ceiling or wall.
A manually operated damper should not be placed in the chimney
connector.
PROPER VENT CONNECTOR INSTALLATION
FIGURE 7
CHIMNEY
The oil-fired water heater must be connected to a chimney built in
accordance with accepted building code practice or listed factory
built type, Table 5. The exit point of the chimney flue gas must be at
least 3' (0.91M) above the highest point where it passes through
the roof of a building. Also, it must be at least 2' (0.61M) higher than
any portion of a building within 10' (3.05 M) of the chimney.
TABLE 5 - USUAL CHIMNEY SIZES FOR UNITS
Oil
Equivalent
Output
Square & Rectangle
Firing
Heat Input
Heat
Stack
Round Stack Minimum
Model
Rate
Rate
Rate
Dimension
Diameter
Height
Number
(GPH)
(LPH)
Btuh
kW
Btuh
kW
Inches
mm
Inches
mm
Feet
Metres
COF-199
1.42
5.38
199,000
58
159,200
47
8 1/2 X 8 1/2
216 x 216
9
228.6
20
6.1
COF-245
1.75
6.62
245,000
72
196,000
57
8 1/2 X 8 1/2
216 x 216
9
228.6
20
6.1
COF-315/315A
2.25
8.52
315,000
92
252,000
74
8 1/2 X 13
216 x 330
10
254
30
9.1
COF-385/385A
2.75
10.41
385,000
113
308,000
90
8 1/2 X 13
216 x 330
10
254
30
9.1
COF-455/455A
3.25
12.30
455,000
133
364,000
107
13 X 13
330 x 330
12
304.8
35
10.7
COF-700/700A
5.0
18.93
700,000
205
560,000
164
13 X 18
330 x 457
14
355.6
40
12.2
