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• 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
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
(1,101 mm
2
/kW) (70 square inches per gallon of oil consumed per
hour) of total input of all appliances in the enclosure, fig. 5.
APPLIANCE AERATION FROM OUTDOORS (OPTIONAL
FOR CONVENTIONAL BUILDINGS, MANDATORY
FOR TIGHT BUILDINGS)
FIGURE 5
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 (21mm/M)
of horizontal connector length must be maintained between the heater
and chimney opening, fig. 6. The connector length should be kept as
short as possible.
Model
Number
(GPH)
1.42
1.75
2.25
2.75
3.25
5
2
/kW) (35 square inches per
TABLE 5 - USUAL CHIMNEY SIZES FOR UNITS
Oil
Equivalent
Output
Firing
Heat Input
Rate
Rate
(LPH)
Btuh
kW
Btuh
5.38
199,000
58
159,200
6.62
245,000
72
196,000
8.52
315,000
92
252,000
10.41
385,000
113
308,000
12.30
455,000
133
364,000
18.93
700,000
205
560,000
TABLE 4 SUGGESTED VENT CONNECTOR SIZES
Model Number
GPO 86-199*
GPO 86-245
GPO 84-315/315A
GPO 75-385/385A
GPO 75-455/455A
GPO 69-700/700A
*
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, a blower type flue gas exhauster must be
employed to assure venting and correct combustion.
Note: A negative draft must be maintained in the vent piping.
Connections shall not be to a chimney, vent or venting system served by
a power exhauster unless the connection is made on the negative pressure
side of the exhauster.
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" (457.2 mm) from a combustible ceiling or wall. A manually
operated damper should not be placed in the chimney connector.
PROPER VENT CONNECTOR INSTALLATION
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'
(0.91 M) above the highest point where it passes through the roof of a
building. Also, it must be at least 2' (0.61 M) higher than any portion of a
building within 10' (3.05 M) of the chimney.
Square & Rectangle
Heat
Stack
Rate
Dimension
kW
Inches
mm
47
8 1/2 X 8 1/2
216 x 216
57
8 1/2 X 8 1/2
216 x 216
74
8 1/2 X 13
216 x 330
90
8 1/2 X 13
216 x 330
107
13 X 13
330 x 330
164
13 X 18
330 x 457
6
Outlet Diameter
Inches
6
8
8
8
8
10
FIGURE 6
Round Stack
Minimum
Diameter
Height
Inches
mm
Feet
Metres
9
228.6
20
6.1
9
228.6
20
6.1
10
254
30
9.1
10
254
30
9.1
12
304.8
35
10.7
14
355.6
40
12.2
(mm)
152.4
203
203
203
203
254
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