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Warning, Caution – Bryant 313AAV User Manual

Page 7

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Masonry acid washing materials

All fuel--burning equipment must be supplied with air for fuel
combustion. Sufficient air must be provided to avoid negative

pressure in the equipment room or space. A positive seal must be

made between the furnace cabinet and the return--air duct to
prevent pulling air from the burner area and from draft safeguard

opening.

18-IN. (457.2 mm)

MINIMUM TO BURNERS

A93044

Fig. 5 -- Installation in a Garage

ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal

injury, death, and/or property damage.
When the furnace is installed in a residential garage, the

burners and ignition sources must be located at least 18

inches above the floor. The furnace must be located or

protected to avoid damage by vehicles. When the furnace is

installed in a public garage, airplane hangar, or other

building having a hazardous atmosphere, the furnace must

be installed

in accordance with the NFGC or

CAN/CSA--B149.1--05. (See Fig. 5).

!

WARNING

PERSONAL INJURY AND/OR PROPERTY

DAMAGE HAZARD
Improper use or installation of this furnace may cause

premature furnace component failure.
This gas furnace may be used for heating buildings under

construction provided that:

--The furnace is permanently installed with all electrical

wiring, piping, venting and ducting installed according to

these installation instructions. A return air duct is provided,

sealed to the furnace casing, and terminated outside the

space containing the furnace. This prevents a negative

pressure condition as created by the circulating air blower,

causing a flame rollout and/or drawing combustion

products into the structure.

--The furnace is controlled by a thermostat. It may not be

“hot wired” to provide heat continuously to the structure

without thermostatic control.

--Clean outside air is provided for combustion. This is to

minimize the corrosive effects of adhesives, sealers and

other construction materials. It also prevents the

entrainment of drywall dust into combustion air, which can

cause fouling and plugging of furnace components.

--The temperature of the return air to the furnace is

maintained between 55_F (13_C) and 80_F (27_C), with

no evening setback or shutdown. The use of the furnace

while the structure is under construction is deemed to be

intermittent operation per our installation instructions.

--The air temperature rise is within the rated rise range on

the furnace rating plate, and the gas input rate has been set

to the nameplate value.

--The filters used to clean the circulating air during the

construction process must be either changed or thoroughly

cleaned prior to occupancy.

--The furnace, ductwork and filters are cleaned as necessary

to remove drywall dust and construction debris from all

HVAC system components after construction is completed.

--Verify proper furnace operating conditions including

ignition, gas input rate, air temperature rise, and venting

according to these installation instructions.

CAUTION

!

Table 2 – Minimum Free Area Required for Each Combustion Air Opening or Duct to Outdoors

FUR-

NACE

INPUT

(BTUH)

TWO HORIZONTAL DUCTS

(1 SQ. IN./2,000 BTUH)

(1,100 SQ. MM/KW)

SINGLE DUCT OR OPENING

(1 SQ. IN./3,000 BTUH)

(734 SQ. MM/KW)

TWO OPENINGS OR VERTICAL

DUCTS

(1 SQ. IN./4,000 BTUH)

(550 SQ. MM/KW)

Free Area of Opening

and Duct

(sq. in. / sq. mm)

Round Duct

Diameter

(in./mm)

Free Area of Open-

ing and Duct

(sq. In. / sq. mm)

Round Duct

Diameter

(in. / mm)

Free Area of

Opening and Duct

(sq. In. / sq. mm)

Round Duct

Diameter

(In./mm)

44,000

22 (14193)

6 (152)

14.7 (9484)

5 (127)

11 (7097)

4 (102)

66,000

33 (21290)

7 (178)

22 (14193)

6 (152)

16.5 (10645)

5 (127)

88,000

44 (28387)

8 (203)

29.3 (18903)

7 (178)

22 (14193)

6 (152)

110,000

55 (35484)

9 (229)

36.7 (23677)

7 (178)

27.5 (17742)

6 (152)

132,000

66 (42581)

10 (254)

44 (28387)

8 (203)

33 (21290)

7 (178)

EXAMPLES: Determining Free Area

FURNACE

WATER HEATER

TOTAL INPUT

110,000

+

30,000

=

(140,000 divided by 4,000)

=

35.0 Sq. In. for each two Vertical Ducts or Openings

66,000

+

40,000

=

(106,000 divided by 3,000)

=

35.3 Sq. In. for a Single Duct or Opening

88,000

+

30,000

=

(118,000 divided by 2,000)

=

59.0 Sq. In. for each of two Horizontal Ducts

313A