Whirlpool WGFD293 Instruction Manual download pdf (Page 27)

High Altitude Derate

When this furnace is installed at high altitude, the appropriate

high altitude orifice kit must be applied. This is required due to

the natural reduction in the density of both the gas fuel and

combustion air as altitude increases. The kit will provide the

proper design-certified input rate within the specified altitude

range.

High altitude kits are purchased according to the installation

altitude and usage of either Natural or propane gas. Contact your

distributor for a tabular listing of appropriate altitude ranges and

corresponding manufacturer’s high altitude (Natural, propane

gas, and/or pressure switch) kits.

NOTE: Do not derate the furnace by adjusting the manifold

pressure to a lower pressure than specified on the furnace rating

plate. The combination of the lower air density and a lower

manifold pressure will prohibit the burner orifice from drawing the

proper amount of air into the burner. This may cause incomplete

combustion, flashback and possible yellow tipping.

In some areas the gas supplier may artificially derate the gas in

an effort to compensate for the effects of altitude. If the gas is

artificially derated, the appropriate orifice size must be

determined based upon the Btu/ft

content of the derated gas

and the altitude. Refer to the National Fuel Gas Code, NFPA 54/

ANSI Z223.1, and information provided by the gas supplier to

determine the proper orifice size.

A different pressure switch may be required at high altitude

regardless of the Btu/ft

content of the fuel used. Contact your

distributor for a tabular listing of appropriate altitude ranges and

corresponding manufacturer’s pressure switch kits.

Propane Gas Conversion

This furnace is configured for Natural gas. The appropriate

manufacturer’s propane gas conversion kit, must be applied for

propane gas installations. See “Propane Gas and/or High Altitude

Installations.”

Contact your distributor for a tabular listing of appropriate

manufacturer’s kits for propane gas and/or high altitude

installations. The indicated kits must be used to ensure safe and

proper furnace operation. All conversions must be performed by

a qualified installer or service agency.

Gas Control Valve

This furnace is equipped with a 24-volt gas control valve

controlled during the furnace operation by the integrated control

module. As shipped, the gas control valve is configured for

Natural gas. The gas control valve is field-convertible for use with

propane gas by replacing the regulator spring with a propane gas

spring from an appropriate manufacturer’s propane gas

conversion kit. Taps for measuring the gas supply pressure and

manifold pressure are provided on the valve.

The gas control valve has a manual On/Off control located on the

gas control valve itself. This control may be set only to the “On”

or “Off” position.

Refer to the lighting instructions label or see “Start-Up Procedure

and Adjustment” for use of this control during the start-up and

shutdown periods.

Gas Piping Connections

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

will operate simultaneously when sizing a trunk line.

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.

Refer to “Gas Piping Connections” illustrations for typical gas line

connections to the furnace.

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

■ Where possible, use new pipe that is properly chamfered,

reamed and free of burrs and chips.

NOTE: If old pipe is used, be sure it is clean and free of rust,

scale, burrs, chips and old pipe joint compound.

■ 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. The drip leg must be a minimum of 3"

(7.6 cm) long.

Placeholder

Possible property damage, personal injury or death may

occur if the correct conversion kits are not installed. The

appropriate kits must be applied to ensure safe and proper

furnace operation. All conversions must be performed by

a qualified installer or service agency.

WARNING

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

Placeholder

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

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Whirlpool WGFD293 Instruction Manual Page 27

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