Goodman Mfg VC8 User Manual download pdf (Page 19)

IRCULATING

AND

ILTERS

air temperature rise must be within the range listed on the fur-

nace nameplate. Should this appliance be converted to LP,

refer to the instructions included in the factory authorized LP

conversion kit.

HIGH A LTITUDE D ERATE

IMPORTANT NOTE: The furnace will naturally derate itself with

altitude. Do not attempt to increase the firing rate by changing

orifices or increasing the manifold pressure. This can cause

poor combustion and equipment failure.

High altitude installations may require both a pressure switch

and an orifice change. These changes are necessary to com-

pensate for the natural reduction in the density of both the gas

fuel and the combustion air at higher altitude.

For installations above 7000 feet, please refer to your distribu-

tor for required kit(s).

High Stage Low Stage

Natural None #43 3.5" w.c. 1.9" w.c. None

Propane

LPM-05*

LPM-06*

#55 10.0" w.c. 6.0" w.c. None

0-7000

Mani fol d Pre ssur e Pre ssure

Switch Change

Altitude Kit

LPM-05* supports White-Rodgers 2-stage valve only

LPM-06* supports Honeywell and White-Rodgers 2-stage valves

Orifice

NOTE:

In Canada, gas furnaces are only certified to 4500 feet.

Gas

Contact the distributor for a tabular listing of appropriate

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

lations. The indicated kits must be used to insure safe and

proper furnace operation. All conversions must be performed

by a qualified installer, or service agency.

PROPANE G AS C ONVERSION

WARNING

OSSIBLE



PROPERTY



DAMAGE

,

PERSONAL



INJURY



DEATH



MAY



OCCUR



THE



CORRECT



CONVERSION



KITS



ARE



NOT



INSTALLED

.T



APPROPRIATE



KITS



MUST



APPLIED



ENSURE



SAFE



AND



PROPER



FURNACE



OPERATION

.A



CONVERSIONS



MUST



PERFORMED



QUALIFIED



INSTALLER



SERVICE



AGENCY

This unit is configured for natural gas. The appropriate

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

propane gas installations. Refer to the “Propane Gas and/or

High Altitude Installations” section for details.

Contact your distributor for a tabular listing of appropriate

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

lations. The indicated kits must be used to insure safe and

proper furnace operation. All conversions must be performed

by a qualified installer, or service agency.

GAS P IPING C ONNECTIONS



AVOID



POSSIBLE



UNSATISFACTORY



OPERATION



EQUIPMENT



DAMAGE



DUE



UNDERFIRING



EQUIPMENT

,

USE



THE



PROPER



SIZE



NATURAL

PROPANE



GAS



PIPING



NEEDED



WHEN



RUNNING



PIPE



FROM



THE



METER

TANK



THE



FURNACE

WARNING

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

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.

Natural Gas Capacity of Pipe

In Cubic Feet of Gas Per Hour (CFH)

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

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

0.60 Specific Gravity Gas)

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 piping.

• Use black iron or steel pipe and fittings for the building

piping.

• Use pipe joint compound on male threads only. Pipe

joint compound must be resistant to the action of the

fuel used.

• Use ground joint unions.

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

enter the gas valve. The drip leg must be a minimum

of three inches 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 two pipe wrenches when making connection to

the gas valve to keep it from turning. The orientation

of the gas valve on the manifold must be maintained

as shipped from the factory.

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 47 48

Comments to this Manuals

No comments

Goodman Mfg VC8 User Manual Page 19

Comments to this Manuals