International comfort products N9MP1 Installation Instructions Manual page 32

WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to properly install metal gas connector
could result in death, personal injury and/or
property damage.
A flexible corrugated metal gas connector must be
properly installed, shall not extend through the side
of the furnace,and shall not be used inside the
furnace.
Black iron pipe shall be installed at the furnace gas
control valve and extend a minimum of 2² ² ² ² outside
furnace casing.
Figure 35 Typical Gas Piping for Upflow
Drip Leg and Union, Union* should be outside the
cabinet. Manual shut- off valve MUST be upstream of
dripleg, union, and furnace.
Use elbows and 3² ² ² ² pipe nipple to connect valve to
piping when using right side gas pipe entry.
O N
LP Low pressure
O F F
switch REQUIRED.
* Union may be installed inside the cabinet when necessary
because of clearances.
Typical Gas Piping for Downflow
Figure 36
Use elbows and 3² ² ² ² pipe nipple to connect valve
to piping when using left side gas pipe entry.
*Union may be installed inside the cabinet when necessary
because of clearances.
32
Manual shut- off
valve
O N
3² ² ² ² pipe
O F F
nipple
LP Low pressure
switch REQUIRED.
Drip Leg and Union, Union* should be outside
the cabinet. Manual shut- -off valve MUST be
upstream of dripleg, union, and furnace.
5. Use black iron or steel pipe and fittings or other pipe ap-
proved by local code.
6. Use ground joint unions and install a drip leg no less than 3²
long to trap dirt and moisture before it can enter gas valve.
7. Use two pipe wrenches when making connections to pre-
vent gas valve from turning.
8. Install a manual shut--off valve external to furnace casing
and tighten all joints securely.
9. If local codes allow the use of flexible gas appliance connec-
tors, always use a new, listed connector. Do not use a con-
nector which has previously serviced another gas
appliance.
Gas Pipe Grommet (Single Pipe)
O N
O F F
Manual shut- off
valve
Gas Pipe Grommet
(Single Pipe)
Alterative
installation
Models may
have 1 or 2
pressure
switches
25--24--86
Models may
have 1 or 2
pressure
switches
Alterative
installation
O N
O F F
25--25--46a
440 01 1021 01