Heat Controller GMDA Installation Instructions Manual Download

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FIGURE 15

GAS PIPING INSTALLATION

GAS PIPE INSTALLATION

GAS SUPPLY AND PIPING

GAS SUPPLY

THIS FURNACE IS EQUIPPED AT

THE FACTORY FOR USE ON

NATURAL GAS ONLY. CONVERSION

TO LP GAS REQUIRES A SPECIAL

KIT AVAILABLE FROM THE

DISTRIBUTOR. FAILURE TO USE THE

PROPER CONVERSION KIT CAN

CAUSE FIRE, CARBON MONOXIDE

POISONING, EXPLOSION,

PROPERTY DAMAGE, PERSONAL

INJURY OR DEATH.
See the conversion kit index supplied

with the furnace. This index identifies

the proper LP Gas Conversion Kit

required for each particular furnace.
IMPORTANT

Any additions, changes

or conversions required for the furnace
to satisfactorily meet the application
should be made by a qualified installer,
service agency or the gas supplier,
using factory-specified or approved
parts. In the commonwealth of
Massachusetts, installation must be
performed by a licensed plumber or gas
fitter for appropriate fuel.

IMPORTANT

Connect this furnace only

to gas supplied by a commercial utility.

IMPORTANT

A U.L. recognized

fuel gas and CO detector(s) are
recommended in all applications,
and their installation should be in
accordance with the detector
manufacturer’s recommendations
and/or local laws, rules, regulations or
customs.

GAS PIPING (SEE FIGURE 15)

Install the gas piping according to all
local codes, state codes and regulations
of the utility company, whichever holds
jurisdiction.

If possible, run a separate gas supply
line directly from the meter to the
furnace. Consult the local gas company
for the location of the manual main shut-
off valve.

The gas line and manual gas

valve must be adequate in size to

prevent undue pressure drop and never

smaller than the pipe size to the

combination gas valve on the furnace.

Refer to Table 2 for the recommended
pipe size for natural gas and Table 3 for
LP gas pipe sizes.

IMPORTANT

It is permissible to run

flexible gas connector inside the unit to
a piece of black pipe. If local codes

WARNING

allow the use of a flexible gas appliance
connector, always use a new listed
connector. Do not use a connector
which has previously serviced another
gas appliance. Massachusetts law
limits flexible gas connectors to a
maximum of 36”.

Install a ground joint union outside the

cabinet to easily remove the control

valve assembly. Install a manual shut-

off valve in the gas line outside the

furnace casing.

The valve should be

readily accessible to turn the gas
supply on or off. Install a drip leg in the
gas supply line as close to the furnace
as possible. Always use a pipe
compound resistant to the action of
liquefied petroleum gases on all
threaded connections.

IMPORTANT:

When making gas pipe

connections, use a back-up wrench to
prevent any twisting of the control
assembly and gas valve. Do not
overtighten the connection.

Any strains on the gas valve can
change the position of the gas orifices
in the burners. This can cause erratic
furnace operation.

IMPORTANT

ENSURE that the

furnace gas control valve not be
subjected to high gas line supply
pressures.

DISCONNECT the furnace and its
individual shut-off valve from the gas
supply piping during

any pressure

testing that exceeds 1/2 PSIG

(3.48 kPa).

GROMMET