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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
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
/kW) (70 square inches per gallon of oil consumed per
2
hour) of total input of all appliances in the enclosure, fig. 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.
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.
Model
Number
(GPH)
GPO 86 -199
1.42
GPO 86 -245
1.75
GPO 84-315 (A)
2.25
GPO 75 -385 (A)
2.75
GPO 75 -455 (A)
3.25
GPO 69 -700 (A)
/kW) (35 square inches per gallon of oil
2
FIGURE 5.
Outlet Diameter
Inches
(mm)
6
152.4
8
8
8
8
10
TABLE 5. USUAL CHIMNEY SIZES FOR UNITS
Oil
Equivalent
Firing
Heat Input
Rate
Rate
(LPH)
Btuh
kW
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
5
18.93
700,000
205
560,000
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" (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.
MULTIPLE HEATER FLUES
When two or more oil-fired water heaters are connected to a single chimney
or vent there shall be sufficient draft available for safe combustion and
removal of combustion products to the outdoors from each heater. Refer
to local codes for connection details.
Only one oil-fired water heater should be connected to any one type L
venting system.
A draft regulator shall be provided for each oil-fired water heater in a
203
multiple heater system.
203
203
203
INCORRECT INSTALLATION CAN CAUSE IMPROPER OPERATION,
254
FIRE, ASPHYXIATION, SERIOUS PERSONAL INJURY OR DEATH. NEVER
OPERATE THIS WATER HEATER UNLESS IT IS PROPERLY VENTED
TO THE OUTDOORS AND HAS ADEQUATE COMBUSTION AIR SUPPLY.
Output
Square & Rectangle
Heat
Stack
Rate
Dimension
Btuh
kW
Inches
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
FIGURE 6.
DANGER
Round Stack
Diameter
mm
Inches
mm
Feet
9
228.6
20
9
228.6
20
10
254
30
10
254
30
12
304.8
35
14
355.6
40
Minimum
Height
Metres
6.1
6.1
9.1
9.1
10.7
12.2
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