Johnson-controls TG9S*MP User Manual Page 26
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364861-UIM-B-0708
26 Johnson Controls Unitary Products
Air Supply Openings and Ducts
1. An opening may be used in lieu of a duct to provide to provide the
outside air supply to an appliance unless otherwise permitted by
the authority having jurisdiction. The opening shall be located
within 12” (30.5 cm) horizontally from, the burner level of the appli-
ance. Refer to “AIR SOURCE FROM OUTDOORS AND VENT
AND SUPPLY AIR SAFETY CHECK” in these instructions for
additional information and safety check procedure.
2. The duct shall be either metal, or a material meeting the class 1
requirements of CAN4-S110 Standard for Air Ducts.
3. The duct shall be least the same cross-sectional area as the free
area of the air supply inlet opening to which it connects.
4. The duct shall terminate within 12 in (30.5 cm) above, and within
24 in (61 cm) horizontally from, the burner level of the appliance
having the largest input.
5. A square or rectangular shaped duct shall only be used when the
required free area of the supply opening is 9 in
2
(58.06 cm
2
) or
larger. When a square or rectangular duct is used, its small dimen-
sion shall not be less than 3 in (7.6 cm).
6. An air inlet supply from outdoors shall be equipped with a means
to prevent the direct entry of rain and wind. Such means shall not
reduce the required free area of the air supply opening.
7. An air supply inlet opening from the outdoors shall be located not
less than 12” (30.5 cm) above the outside grade level.
Combustion Air Source from Outdoors
1. Two permanent openings, one within 12 in (30.5 mm) of the top
and one within 12 in (30.5 mm) of bottom of the confined space,
Two permanent openings, shall communicate directly or by means
of ducts with the outdoors, crawl spaces or attic spaces.
2. One permanent openings, commencing within 12 in (30.5 mm) of
the top of the enclosure shall be permitted where the equipment
has clearances of at least 1 in (2.54 cm) from the sides and back
and 6 in (15.24 cm) from the front of the appliance. The opening
shall communicate directly with the outdoors and shall have a min-
imum free area of:
a. 1 square in per 3000 Btu per hour (6.45 cm3 per 0.879 kW) of
the total input rating of all equipment located in the enclosure.
b. Not less than the sum of all vent connectors in the confined
space.
3. The duct shall be least the same cross-sectional area as the free
area of the air supply inlet opening to which it connects.
4. The blocking effects of louvers, grilles and screens must be given
consideration in calculating free area. If the free area of a specific
louver or grille is not known. Refer to Table 11, "Estimated Free
Area".
When a Category I furnace is removed or replaced, the original
venting system may no longer be correctly sized to properly vent
the attached appliances.
An improperly sized vent system can cause CARBON MONOXIDE
to spill into the living space causing personal injury, and or death.
Table 12: Unconfined Space Minimum Area in Square Inch
BTUH Input Rating
Minimum Free Area in Square Feet
Required for Each Opening
40,000
40 (258 cm
2
)
60,000
60 (387 cm
2
)
80,000
80 (516 cm
2
)
100,000
100 (645 cm
2
)
120,000
120 (742 cm
2
)
130,000
130 (838 cm
2
)
Table 13: Free Area
BTUH Input
Rating
Minimum Free Area Required for Each Opening
Horizontal Duct
(2,000 BTUH)
Vertical Duct or
Opening to Outside
(4,000 BTUH)
Round Duct
(4,000 BTUH)
40,000
20 in
2
(129 cm
2
) 10 in
2
(64 cm
2
)
4” (10 cm)
60,000
30 in
2
(193 cm
2
) 15 in
2
(97 cm
2
)
5” (13 cm)
80,000
40 in
2
(258 cm
2
) 20 in
2
(129 cm
2
)
5” (13 cm)
100,000
50 in
2
(322 cm
2
) 25 in
2
(161 cm
2
)
6” (15 cm)
120,000
60 in
2
(387 cm
2
) 30 in
2
(193 cm
2
)
7” (18 cm)
130,000
65 in
2
(419 cm
2
) 33 in
2
(213 cm
2
)
7” (18 cm)
EXAMPLE: Determining Free Area.
Appliance 1 Appliance 2 Total Input
100,000 + 30,000 = (130,000 ÷ 4,000) = 32.5 Sq. In. Vertical
Appliance 1 Appliance 2 Total Input
100,000 + 30,000 = (130,000 ÷ 2,000) = 65 Sq. In. Horizontal
FIGURE 36: Outside and Ambient Combustion Air
Gable
Vent
Gas
Vent
Soffit
Vent
Ventilated
Attic
Top Above
Insulation
Optional
Inlet (a)
Outlet
Air (a)
Ventilated
Crawl Space
Gas
Water
Heater
Furnace
Soffit
Vent
Gas
Water
Heater
Inlet
Air (a)
Inlet
Air (b)
Furnace
Gas
Vent
Outlet
Air (a)
Outlet
Air (b)
Inlet
Air (a)
Inlet
Air (b)
Gas
Water
Heater
Furnace
Ventilated
Attic
Top Above
Insulation
Gable
Vent
Gas
Vent
- INSTALLATION MANUAL 1
- SECTION II: DUCTWORK 4
- For duct attachment 5
- Mounting Plate 6
- Sediment 7
- SECTION III: FILTERS 8
- SECTION IV: GAS PIPING 9
- SECTION V: ELECTRICAL POWER 10
- 364861-UIM-B-0708 11
- SUPPLY VOLTAGE CONNECTIONS 11
- FURNACE VENTING CONFIGURATION 16
- DOWNFLOW - INDUCER ROTATED 18
- FOR LEFT SIDE VENTING 18
- FOR RIGHT SIDE VENTING 18
- INDUCER ROTATED 19
- INDUCER AS RECEIVED 19
- (Except for 130K Model) 19
- HORIZONTAL - LEFT 19
- HORIZONTAL - RIGHT 20
- VENT SYSTEM 21
- COMBUSTION AIR / VENTING 22
- VENT CLEARANCES 23
- VENTING MULTIPLE UNITS 24
- Air Supply Openings and Ducts 26
- Ventilated Combustion Air 27
- VENT BLOWER ROTATION 27
- SECTION IX: START-UP AND 28
- ADJUSTMENTS 28
- SECTION X: SAFETY CONTROLS 31
- RETRIEVAL 33
- SECTION XII: WIRING DIAGRAM 35
- 5005 York Drive 36
- Norman, OK 73069 36
- QUICK REFERENCE GUIDE 37
- DOWNFLOW 38
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