20
After the gas piping to the furnace is complete, all
connections must be tested for gas leaks. This includes
pipe connections at the main gas valve, emergency
shutoff valve and fl exible gas connectors (if applicable).
The soap and water solution can be applied on each
joint or union using a small paintbrush. If any bubbling is
observed, the connection is not sealed adequately and
must be retightened. Repeat the tightening and soap
check process until bubbling ceases.
IMPORTANT NOTE: When pressure testing gas supply
lines at pressures greater than 1/2 psig (14 inch W.C.),
the gas supply piping system must be disconnected
from the furnace to prevent damage to the gas control
valve. If the test pressure is less than or equal to 1/2
psig (14 inch W.C.), close the manual shut-off valve.
High Altitude Application
High altitude conversion with this furnace depends on the
installation altitude and the heating value of the gas. The
installation of this furnace at altitudes above 2,000 feet
must meet the requirements of the National Fuel Gas
Code or local jurisdiction. In Canada, the requirements for
high altitude are different and governed by CGA B149.1.
Please consult your local code authority.
GAS SUPPLY AND PIPING
All gas piping must be installed in compliance with local
codes and utility regulations.
In the absence of local codes the gas line installation
must comply with the latest edition of the National Fuel
Gas Code (ANSI Z223.1) or (CAN/CGA B149.1 or .2)
Installation Codes. Additional reference information for US
and Canadian installations can be found in the Gas Piping
and Gas Pipe Pressure Testing section (page 5).
IMPORTANT NOTES:
• Some local regulations require the installation of a
manual main shut-off valve and ground joint union
external to the furnace as depicted in Figure 18 (page
20). The shut-off valve should be readily accessible for
service and/or emergency use. Consult the local utility
or gas supplier for additional requirements regarding
placement of the manual main gas shut-off.
• Gas piping must never run in or through air ducts,
chimneys, gas vents, or elevator shafts.
• Compounds used on threaded joints of gas piping
must be resistant to the actions of liquefi ed petroleum
gases.
• The main gas valve and main power disconnect to the
furnace must be properly labeled by the installer in case
emergency shutdown is required.
• Flexible gas connectors are not recommended for this
type of furnace but may be used if allowed by local
jurisdiction. Only new fl exible connectors may be used.
Do not reuse old fl exible gas connectors.
• A drip leg should be installed in the vertical pipe run to
the unit (Figure 18).
Table 9 (page 35) lists gas fl ow capacities for standard
pipe sizes as a function of length in typical applications
based on nominal pressure drop in the line.
The furnace may be installed for either left or right side gas
entry. When connecting the gas supply, provide clearance
between the gas supply line and the entry hole in the
furnace casing to avoid unwanted noise and/or damage
to the furnace. A typical gas service hookup is shown in
Figure 18.
Leak Check
WARNING:
FIRE OR EXPLOSION HAZARD
Never test for gas leaks with an open fl ame.
Check all connections using a commercially
available soap solution. A fi re or explosion
may result causing property damage, personal
injury or loss of life. Failure to follow the safety
warnings exactly could result in serious injury,
death or property damage.
Figure 18. Typical Gas Connection
Dripleg
Manifold
Elbow
Burner
Assembly
Note: Some utilities require Shut- Off Valve to be 4 to 5 feet above floor.
Ground Joint
Union
Upflow Models - Right Side Entry
Downflow Models - Left Side Entry
Dripleg
Automatic
Gas Valve
(with manual
shut-off)
Manifold
Elbow
Burner
Assembly
Shut-Off Valve
(See Note)
Ground Joint
Union
Shut-Off Valve
(See Note)
Automatic
Gas Valve
(with manual
shut-off)
