Bryant 574D Manual de instrucciones descargar pdf (Pagina 10)

Table 2 – Maximum Gas Flow Capacity*

NOMINAL

IRON PIPE

SIZE (IN.)

INTERNAL

DIAMETER

(IN.)

LENGTH OF PIPE FT (m)†

(3)

(6)

(9)

(12)

(15)

(18)

(21)

(24)

(27)

100

(30)

125

(38)

150

(46)

175

(53)

200

(61)

1/2 .622 175 120 97 82 73 66 61 57 53 50 44 40 — —

3/4 .824 360 250 200 170 151 138 125 118 110 103 93 84 77 72

1 1.049 680 465 375 320 285 260 240 220 205 195 175 160 145 135

1 --- 1 / 4 1.380 1400 950 770 600 580 530 490 460 430 400 360 325 300 280

1 --- 1 / 2 1.610 2100 1460 1180 990 900 810 750 690 650 620 550 500 460 430

*Capacity of pipe in cu ft of gas per hr for gas pressure of 0.5 psig or less. Pressure drop of 0.5---IN. W.C. (based on a 0.60 specific gravity gas). Refer to Table

2 and National Fuel Gas Code NFPA 54/ANSI Z223.1.

{ This length includes an ordinary number of fittings.

OUT

TEE

NIPPLE

CAP

C99020

Fig. 8 -- Sediment Trap

NOTE: Pressure test the gas supply system after the gas supply

piping is connected to the gas valve. The supply piping must be

disconnected from the gas valve during the testing of the piping

systems when test pressure is in excess of 0.5 psig. Pressure test the

gas supply piping system at pressures equal to or less than 0.5 psig.

The unit heating section must be isolated from the gas piping

system by closing the external main manual shutoff valve and

slightly opening the ground--joint union.

FIRE OR EXPLOSION HAZARD

Failure to follow this warning could result in personal injury,

death and/or property damage.

--Connect gas pipe to unit using a backup wrench to avoid

damaging gas controls.

--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. (51 mm)

outside furnace casing.

--If codes allow a flexible connector, always use a new

connector. do not use a connector which has previously

serviced another gas appliance.

WARNING

8. Check for gas leaks at the field--installed and

factory--installed gas lines after all piping connections have

been completed. Use a commercially available soap solution

(or method specified by local codes and/or regulations).

Step 9 — Install Duct Connections

The unit has duct flanges on the supply-- and return--air openings

on the side and bottom of the unit. For downshot applications, the

ductwork connects to the roof curb (See Fig. 3 and 4 for

connection sizes and locations).

Configuring Units for Downflow (Vertical) Discharge

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal

injury or death.

Before installing or servicing system, always turn off main

power to system and install lockout tag. There may be

more than one disconnect switch.

WARNING

1. Open all electrical disconnects before starting any service

work.

2. Remove horizontal (metal) duct covers to access vertical

(downflow) discharge duct knockouts in unit basepan.

3. Using Fig. 10 as a guide, proceed to cut out the downflow

duct panels.

4. Drill 1/2 in. (13 mm) diameter or larger holes in all four

corners of duct panels.

NOTE: On large chassis units remove sheet metal shields on

panels by using a screw driver to shear off retainers and discard.

5. On left and side supply duct opening side with keyhole or

single bladed hacksaw cut out panel along “V” groove.

6. On right side, with keyhole or single blade hacksaw, with

teeth facing up and starting from the front and moving to

the rear, cut along “V” groove.

7. Now with three sides cut, flex panel up and down to re-

move.

8. Replace side access panel and duct cover.

9. After completing unit conversion, perform all safety checks

and power up unit.

Alternate Method

1. Open all electrical disconnects and install lockout tag before

starting any service work.

2. Remove horizontal (metal) ductcovers to access vertical

(downflow) discharge duct knockouts in unit basepan. (See

Fig. 9.)

3. Leave top shipping crate on unit during this method.

4. Tip unit over on the front side (access panels) so the bottom

of the base pan is accessible.

5. Drill two holes diagonally opposed, of suitable size to ac-

commodate jigsaw or reciprocating saw. (See Fig. 10.)

574D-- -- A

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 37 38

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