Rheem GLH series, Installation Instructions Manual

Page: 16 / 36

16
FIGURE 12
GAS PIPING INSTALLATION
UPFLOW & DOWNFLOW
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 SUPPLIED BY THE
DISTRIBUTOR OR MANUFACTURER.
MAILING ADDRESSES ARE LISTED
ON THE FURNACE RATING PLATE,
PARTS LIST AND WARRANTY.
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
Install the gas piping according to all
local codes and regulations of the utility
company.
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 3 for the recom-
mended pipe size for natural gas and
Table 4 for LP gas pipe sizes.
IMPORTANT : It is permissible to run
flexible gas connector inside the unit to
!
WARNING
HORIZONTAL
a piece of black pipe. If local codes
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 inside 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.
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).