Bryant 355MAV Instructions d'exploitation télécharger pdf (Page 20)

straps, hangers, etc. Use a minimum of 1 hanger every 6 ft. Joint

compound (pipe dope) should be applied sparingly and only to

male threads of joints. Pipe dope must be resistant to propane gas.

WARNING: FIRE OR EXPLOSION HAZARD

Failure to follow this warning could result in fire,

explosion, personal injury, or death.

- Connect gas pipe to furnace using a backup wrench to

avoid damaging gas controls.

- Gas valve shutoff switch MUST be facing forward or

tilted upward.

- Never purge a gas line into a combustion chamber.

Never test for gas leaks with an open flame. Use a

commercially available soap solution made specifically

for the detection of leaks to check all connections.

- Use proper length of pipe to avoid stress on gas control

manifold.

- If a flexible connector is required or allowed by

authority having jurisdiction, black iron pipe shall be

installed at furnace gas valve and extend a minimum of 2

in. outside furnace casing.

Install a sediment trap in riser leading to furnace. Trap can be

installed by connecting a tee to riser leading to furnace so

straight-through section of tee is vertical. Then connect a capped

nipple into lower end of tee. Capped nipple should extend below

level of gas controls. Place a ground joint union between gas

control manifold and manual gas shutoff valve. (See Fig. 27.)

An accessible manual shutoff valve MUST be installed external to

furnace casing and within 6 ft of furnace. A 1/8-in. NPT plugged

tapping, accessible for test gauge connection, MUST be installed

immediately upstream of gas supply connection to furnace and

downstream of manual shutoff valve.

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. 62.)

Piping should be pressure and leak tested in accordance with

NFGC in the United States or NSCNGPIC 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 and

minimum inlet supply pressures marked on the rating plate with

the furnace burners ON at HI-HEAT and OFF.

VIII. ELECTRICAL CONNECTIONS

See Fig. 28 for field wiring diagram showing typical field 115-v

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

for tightness.

WARNING: 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.

CAUTION: 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.

A. 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 70-2002 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.

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, furnace control status code indicator light will

flash rapidly and furnace will NOT operate.

Fig. 27—Typical Gas Pipe Arrangement

A93324

UNION

SEDIMENT

TRAP

MANUAL

SHUTOFF

VALVE

(REQUIRED)

GAS

SUPPLY

TABLE 3—MAXIMUM CAPACITY OF PIPE*

NOMINAL

IRON

PIPE

SIZE

(IN.)

INTERNAL

DIAMETER

(IN.)

LENGTH OF PIPE (FT)

10 20 30 40 50

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 pressures 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.

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Bryant 355MAV Instructions d'exploitation Page 20

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