Bryant 355CAV Instruction Manual download pdf (Page 23)

Table 3 – Maximum Capacity of Pipe*

NOMINAL

IRON

PIPE

SIZE

(IN.)

INTERNAL

DIAMETER

(IN.)

LENGTH OF PIPE (FT/M)

10/

3.0

20/

6.1

30/

9.1

40/

12.2

50/

15.2

1/2 0.622 175 120 97 82 73

3/4 0.824 360 250 200 170 151

1 1.049 680 465 375 320 285

1 --- 1 / 4 1.380 1400 950 770 660 580

1 --- 1 / 2 1.610 2100 1460 1180 990 900

* Cubic ft of gas per hr for gas pressure of 0.5 psig (14--- in. wc) or less, and a pressure

drop of 0.5--- in. wc (based on a 0.60 specific gravity gas). Ref: Table 9--- 2 NFPA

54--- 2002.

NOTE: The gas valve inlet pressure tap connection is suitable to

use as test gauge connection providing test pressure DOES NOT

exceed maximum 0.5 psig (14--in. wc) stated on gas valve. (See

Fig. 60.)

Piping should be pressure and leak tested in accordance with

NFGC in the United States or CAN/CSA--B149.1-- 05 in Canada,

local, and national plumbing and gas codes before the furnace has

been connected. If pressure exceeds 0.5 psig (14--in. wc), gas

supply pipe must be disconnected from furnace and capped

before pressure test.

If test pressure is equal to or less than 0.5 psig (14-- in. wc), turn

off electric shutoff switch located on gas valve before test. It is

recommended that ground joint union be loosened before

pressure testing. After all connections have been made, purge

lines and check for leakage at furnace prior to placing it into

service.

The gas supply pressure shall be within the maximum (13.6-- in.

wc) and minimum (4.5-- in.wc) inlet supply pressures marked on

the rating plate with the furnace burners ON at HI--HEAT and

OFF.

Electrical

Connections

See Fig. 29 for field wiring diagram showing typical field 115--v

and 24--v wiring. Check all factory and field electrical

connections for tightness.

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal

injury or death.

Blower access door switch opens 115-- v power to furnace

control. No component operation can occur. Do not bypass

or close switch with panel removed.

WARNING

UNIT MAY NOT OPERATE

Failure to follow this caution may result in intermittent

unit operation.

Furnace control must be grounded for proper operation

or control will lock out. Control is grounded through

green/yellow wire connected to gas valve and burner

box screw.

WARNING

115--v Wiring

Before proceeding with electrical connections, make certain that

voltage, frequency, and phase correspond to that specified on

furnace rating plate. Also, check to be sure that service provided

by power supply is sufficient to handle load imposed by this

equipment. Refer to rating plate or Table 4 for equipment

electrical specifications.

Make all electrical connections in accordance with National

Electrical Code (NEC) ANSI/NFPA 70--2005 and any local codes

or ordinances that might apply. For Canadian installations, all

electrical connections must be made in accordance with Canadian

Electrical Code CSA C22.1 or authorities having jurisdiction.

Field--supplied wiring shall conform with the limitations of 63_F

(33_C) rise.

The furnace must be electrically grounded in accordance with

local codes; or in the absence of local codes, with the National

Electric Code ANSI/NFPA 70 and/or the Canadian Electric Code,

CSA C22.1, Part I, if an external electrical source is utilized.

Use a separate branch electrical circuit containing a properly sized

fuse or circuit breaker for this furnace. See Table 4 for wire size

and fuse specifications. A disconnecting means must be located

within sight from and readily accessible to furnace.

NOTE: Proper polarity must be maintained for 115-- v wiring. If

polarity is incorrect or furnace is not grounded properly, furnace

control status code indicator light will flash rapidly and furnace

will NOT operate.

FIRE HAZARD

Failure to follow this warning could result in personal injury,

death, or property damage.

Do not connect aluminum wire between disconnect switch

and furnace. Use only copper wire. (See Fig. 30.)

WARNING

355CAV

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Bryant 355CAV Instruction Manual Page 23

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