AAON RN-140 - Manual (Page 55)

55
Table 16 - Gas Piping Supports
Pipe Size Support Intervals
1/2” to 3/4”
Every 6 ft
3/4” to 1”
Every 8 ft
1-3/4” or Larger
(Horizontal)
Every 10 ft
1-1/4” or Larger
(Vertical)
Every Floor
Additional Gas Piping Considerations
Local codes will usually require a field
provided and installed manual main shutoff
valve and union external to the unit. Main
shutoff valve should be labeled. A drip leg
should be installed near the unit connection
to trap sediment and condensate. Pipe joint
compounds used on all gas piping
connections should be resistant to liquid
petroleum gases. If flexible gas piping to the
unit, or in the unit, must be replaced
connectors cannot be reused, only new
connectors may be used.
Heat exchanger comes equipped with a
condensate drain which should be plumbed
to the appropriate drain according to the
(United States) National Fuel Gas Code
ANSI-Z223.1/NFPA 54 or the current
(Canada)
National Fuel & Propane
Installation Code CSA B149.1 or B149.2,
the International Building Code, and any
applicable local and regional codes and
regulations.
The condensate drain connection is located
next to the gas entry location. For 6-50, 60
and 70 ton units, the heat exchanger
condensate drain connection from the unit is
a 5/8” barbed nylon elbow connection. For
55, 65 and 75-140 ton units, the heat
exchanger condensate drain connection from
the unit is a 1/2” PVC connection. For 55,
65 and 75-140 ton units, the heat exchanger
condensate drain can be tied into the
evaporator condensate drain, if code allows.