Whirlpool WPIO-369B Instruction Manual download pdf (Page 18)

Gas Piping Connections

When sizing a trunk line, be sure to include all appliances which

will operate simultaneously.

The gas piping supplying the furnace must be properly sized

based on the gas flow required, specific gravity of the gas and

the length of the run. The gas line installation must comply with

local codes, or in their absence, with the latest edition of the

National Fuel Gas Code, NFPA 54/ANSI Z223.1.

Pressure 0.5 psig or less and pressure drop of 0.3" W.C.; based

on 0.60 specific gravity gas

To connect the furnace to the building’s gas piping, the installer

must supply a ground joint union, drip leg, manual shutoff valve

and line and fittings to connect to the gas control valve. In some

cases, the installer may also need to supply a transition piece

from ¹⁄₂" (1.3 cm) pipe to a larger pipe size.

The following stipulations apply when connecting gas piping.

■ Use black iron or steel pipe and fittings for building piping.

■ Use pipe joint compound (pipe dope) on male threads only.

■ Always use pipe joint compound (pipe dope) that is approved

for all gases.

NOTE: Do not apply compound to the first 2 threads.

■ Use ground joint unions.

■ Install a drip leg to trap dirt and moisture before it can enter

the gas control valve.

NOTE: The drip leg must be a minimum of 3" (7.6 cm) long.

■ Install a ¹⁄₈" NPT pipe plug fitting, accessible for test gage

connection, immediately upstream of the gas supply

connection to the furnace.

■ Use 2 pipe wrenches when making the connection to the gas

control valve to keep it from turning.

NOTE: The orientation of the gas control valve on the

manifold must be maintained as shipped from the factory.

■ Install a manual shutoff valve between the gas meter and the

furnace within 6 ft (1.8 m) of the furnace.

■ If a union is installed, the union must be downstream of the

manual shutoff valve, between the shutoff valve and the

furnace.

■ Tighten all joints securely.

■ Connect the furnace to the building piping by one of the

following methods:

1. Rigid metallic pipe and fittings.

2. Semirigid metallic tubing and metallic fittings.

NOTE: Aluminum alloy tubing must not be used in exterior

locations.

■ Use UL Listed/CSA approved gas appliance connectors in

accordance with their instructions.

■ Gas connectors must be fully in the same room as the

furnace.

■ Protect gas connectors and semirigid tubing against physical

and thermal damage when installed.

■ Ensure that aluminum alloy tubing and connectors are coated

to protect against external corrosion when in contact with

masonry, plaster, insulation or subjected to repeated wetting

by liquids such as water (except rain water), detergents or

sewage.

General Furnace Layout

Upflow Installations

When the gas piping enters through the right side of the furnace,

the installer must supply the following fittings (starting from the

gas control valve):

■ 90º elbows (2)

■ Close nipple

■ Straight pipe to reach the exterior of the furnace

■ Ground joint union

Natural Gas Capacity of Pipe—Cu ft of Gas Per Hour

(CFH)

Length of

Pipe—

ft (m)

Nominal Black Pipe Size

¹⁄₂ " ³⁄₄ "1" 1¹⁄₄ "1¹⁄₂ "

10 (3) 132 278 520 1,050 1,600

20 (6.1) 92 190 350 730 1,100

30 (9.2) 73 152 285 590 980

40 (12.2) 63 130 245 500 760

50 (15.2) 56 115 215 440 670

60 (18.3) 50 105 195 400 610

70 (21.3) 46 96 180 370 560

80 (24.4) 43 90 170 350 530

90 (27.4) 40 84 160 320 490

100 (30.5) 38 79 150 305 460

CFH =

Btu/h Furnace Input

Heating Value of Gas (Btu/cu ft)

Goodman 62

To avoid possible unsatisfactory operation or equipment

damage due to underfiring of equipment, use the proper

size of Natural/propane gas piping needed when running

pipe from the meter/tank to the furnace.

CAUTION

A. Manual shutoff valve location

(upstream of ground joint pipe union)

B. Height required by local codes

C. Ground joint pipe union (upstream of

gas control valve)

D. Drip leg

E. Reducing coupling—

¹⁄₂

" x

¹⁄₈

with

¹⁄₈

" pipe plug to

measure line gas pressure

Furnace Layout

G 2009

‘‘

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 39 40

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Whirlpool WPIO-369B Instruction Manual Page 18

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