Typical Gas Piping For Upflow; Typical Gas Piping For Downflow - Arcoaire N9MP1 Installation Instruction

WARNING
!
FIRE OR EXPLOSION HAZARD.
Failure to follow this warning could result in
personal injury, death 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 2" outside
furnace casing.
Figure 37

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 3" pipe nipple to connect valve to
piping when using right side gas pipe entry.
Propane Low pres- O F F
sure switch
REQUIRED.
* Union may be installed inside the cabinet when necessary
because of clearances.
Representative drawing only, some models may vary in appearance.
Figure 38

Typical Gas Piping for Downflow

Use elbows and 3" 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.
Representative drawing only, some models may vary in appearance.
34
3" pipe
nipple
O N
Propane Low pres-
sure switch
REQUIRED.
Drip Leg and Union, Union* should be outside
the cabinet. Manual shut- -off valve MUST be
upstream of dripleg, union, and furnace.
Specifications are subject to change without notice
6. Use two pipe wrenches when making connections to
prevent gas valve from turning.
7. Install a manual shut--off valve external to furnace casing
and tighten all joints securely.
8. If local codes allow the use of flexible gas appliance
connectors, always use a new listed connector.
Do not use a connector which has previously serviced
another gas appliance.
9. Flexible corrugated metal gas connector may NOT be used
inside the furnace or be secured or supported by the furnace
or ductwork.
10. Properly size gas pipe to handle combined appliance load
or run gas pipe directly from gas meter or Propane gas
regulator.
11. Install correct pipe size for run length and furnace rating.
12. Measure pipe length from gas meter or Propane second
stage regulator to determine gas pipe size.
Vent Pipe Grommet (Single Pipe)
Manual shut- off
valve
O N
O F F
O N
O F F
Manual shut- off
valve
Gas Pipe Grommet
(Single Pipe)
Models may
have 1 or 2
pressure
switches
25--24--86
Models may
have 1 or 2
pressure
switches
O N
O F F
25--25--46a
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