Warning – Bryant Condensing Gas 355CAV User Manual

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

3/4

0.824

360

250

200

170

151

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

355C