J952V Installation Manual

19
Figure 18. Typical Gas Connections
See
Note “B”
See
Note “B”
Right Side Entry
Left Side Entry
A
utomatic Gas Valvle
(w/ Manual Shut-Off)
Pipe
Nipple
Elbow
See
Note “A”
See
Note “A”
8
Shut-Off
Valve
Dripleg
Union
Manifold
Burner
Assembly
Plug
See Note “C”
Manifold
Burner
Assembly
Plug
A
utomatic Gas Valvle
(w/ Manual Shut-Off)
Shut-Off
Valve
Dripleg
Union
Pipe
Nipple
Elbow
NOTE A: Consult local codes for Shut- Off Valve location requirements.
NOTE B: Inducer assembly omitted for clarity of pipe installation.
NOTE C: Left side gas entry not available on ‘A’ width cabinets.
Leak Check
WARNING:
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could
result in serious injury or property damage.
Never test for gas leaks with an open flame.
Use a commercially available soap solution
made specifically for the detection of leaks
to check all connections. A fire or explosion
may result causing property damage, personal
injury or loss of life.
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 flexible
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 (Natural Gas Only)
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.
WARNING:
The reduction of input rating necessary for high
altitude installation may only be accomplished
with factory supplied orifices. Do not attempt to
drill out orifices in the field. Improperly drilled
orifices may cause fire, explosion, carbon
monoxide poisoning, personal injury or death.
The furnaces are shipped from the factory with orifices and
gas regulator settings for natural gas operation at sea level
altitudes. At 2,000 feet, the NFGC requires that this appliance
be derated 4% for each 1,000 feet of altitude. For example,
the input needs to be reduced 8% at 2,000 feet, 12% at 3,000
feet, etc. This deration is in reference to the input rate and
gas heating value at sea level.
To derate the furnace requires knowing the heating value of
the gas at the installation site. Heating values at particular
job sites vary for two reasons:
1. The chemical mixture of the gas varies from region to
region and is expressed as the “sea level heating value”.
2. The heating value varies by altitude. For this reason,
particularly in high altitude areas, the local gas utility usually
Table 6 (page 28) lists gas flow capacities for standard pipe
sizes as a function of length in typical applications based on
nominal pressure drop in the line.
NOTE: The ‘A’ width furnace can only be installed with right
side gas entry. ‘B’, ‘C’, & ‘D’ width furnaces may be installed
for either left or right side gas entry (only).
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. Typical
gas hookups are shown in
Figure 18.