Amana AMH8 Operations Instructions download pdf (Page 30)

PRODUCT DESIGN

High altitude kits are purchased according to the installa-

tion altitude and usage of either natural or propane gas.

Refer to the product Specification Sheet or Technical Manual

for a tabular listing of appropriate altitude ranges and cor-

responding manufacturer’s high altitude (Natural, Propane

gas, and/or Pressure Switch) kits.

Do not derate the furnace by adjusting the manifold pres-

sure to a lower pressure than specified on the furnace rat-

ing 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 yel-

low 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. Refer to

the product Specification Sheet or Technical Manual for a

tabular listing of appropriate altitude ranges and correspond-

ing manufacturer’s pressure switch kits.

PROPANE GAS CONVERSION

WARNING

OSSIBLE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH MAY OCCUR IF

THE CORRECT CONVERSION KITS ARE NOT INSTALLED.

HE APPROPRIATE KITS

MUST BE APPLIED TO INSURE SAFE AND PROPER FURNACE OPERATION.

CONVERSIONS MUST BE PERFORMED BY A QUALIFIED INSTALLER OR SERVICE

AGENCY.

This unit is configured for natural gas. The appropriate

manufacturer’s propane gas conversion kit, must be ap-

plied for propane gas installations.

• Two-stage furnace models using a White-Rodgers

36G54 two-stage valve require an LPM-05 or LPM-

06 LP conversion kit.

• Two-stage furnace models using a Honeywell VR9205

two-stage valve require an LPM-06 LP conversion

kit.

Refer to the specification sheet for the model you are ser-

vicing. Refer to the “propane gas and/or High Altitude In-

stallations” section for details.

GAS VALVE

This unit is equipped with a 24 volt gas valve controlled

during furnace operation by the integrated control module.

As shipped, the valve is configured for natural gas. The

valve is field convertible for use with propane gas by using

the appropriate propane gas conversion kit. Taps for mea-

suring the gas supply pressure and manifold pressure are

provided on the valve.

NOTE: The gas supply pressure on White-Rodger "G"

model gas valve, used on single stage furnaces, can

be checked with a gas pressure test kit (Part

#0151K00000S) available through our authorized dis-

tributors.

The gas valve has a manual ON/OFF control located on the

valve itself. This control may be set only to the “ON” or

“OFF” position. Refer to the Lighting Instructions Label or

the “Putting the Furnace Into Operation” section of this

manual or the installation instructions for use of this control

during start up and shut down periods.

GAS PIPING CONNECTIONS

CAUTION

O 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.

The gas piping supplying the furnace must be properly sized

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

and 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.

Length of Nominal Black Pipe Size

Pipe in Feet 1/2" 3/4" 1" 1 1/4" 1 1/2"

10 132 278 520 1050 1600

20 92 190 350 730 1100

30 73 152 285 590 980

40 63 130 245 500 760

50 56 115 215 440 670

60 50 105 195 400 610

70 46 96 180 370 560

80 43 90 170 350 530

90 40 84 160 320 490

100 38 79 150 305 460

CFH =

(Pressure 0.5 psig or less and pressure drop of 0.3" W.C.; Based on 0.60 Specific

Gravity Gas)

Natural Gas Capacity of Pipe

In Cubic Feet of Gas Per Hour (CFH)

BTUH Furnace Input

Heating Value of Gas (BTU/Cubic Foot)

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 gas valve.

In some cases, the installer may also need to supply a

transition piece from 1/2" pipe to a larger pipe size.

The following stipulations apply when connecting gas pip-

ing. Refer to the following figures for typical gas line con-

nections to the furnace.

1. Use black iron or steel pipe and fittings for the build-

ing piping.

2. Use pipe joint compound on male threads only. Pipe

joint compound must be resistant to the action of the

fuel used.

3. Use ground joint unions.

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Amana AMH8 Operations Instructions Page 30

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