Reznor APD User Manual

Figure 6. Vent Pipe Support
• Combustion air pipe support: support a single-wall metal horizontal combustion air run every 6 feet (1.8 meters).
Support a vertical single-wall metal combustion air pipe in accordance with accepted industry practices. The heater
and concentric adapter box may be used to support a vertical combustion air pipe.
• This unit heater is a high-efficiency appliance designed to extract part of the latent heat from the products of
combustion.
14
UEZ-IOM (07-23) 1034347-I
VENTING AND COMBUSTION AIR REQUIREMENTS—CONTINUED
Vent/Combustion Air System Piping Support
Vent/Combustion Piping Support (Unit Sizes 055–110)
All vent/combustion piping supports for unit sizes 055, 085, and 110 must comply with the vent system manufacturer’s
requirements.
Vent/Combustion Piping Support (Unit Sizes 130–310)
⚠ CAUTION ⚠
DO NOT use the heater or concentric adapter box to provide vent pipe support.
• Vent pipe support: for continued safe operation, the vent system must be properly supported. A 10-foot (3-meter)
length of PVC pipe weighs 20 pounds (9 kg) and has an expansion rate of four times that of metal pipe.
• Horizontal CPVC or PVC vent: must be supported every 6 feet (1.8 meters). The hangers should provide as
much bearing surface as possible and must be free of sharp edges and burrs. Hangers must allow the pipe to
expand laterally. Consider pipe expansion when placing hangers. Changes in pipe direction will allow for expansion.
Hangers must be placed to allow for some direction movement. The slip joint at the concentric adapter box is
designed to permit some limited expansion.
• Vertical CPVC or PVC vent: it is recommended that an engineer design the vertical support system. An acceptable
field-supplied cradle-type support that allows for expansion for a simple vertical vent that is 30 feet (9.1 meters)
or less and rises closely from the heater is shown in Figure 6.
Cradle Support
3 to 6 inches
(76 to 152 mm)
Maximum length 6 feet (1.8 M) for single support
3/8-inch threaded rod
attached to building
structural member
Vertical single-wall
combustion air pipe may be
supported by heater and
concentric adapter box
UNIT
Vertical Vent
Sweep-type
elbow only
Slope horizontal run downward slightly
toward vent condensate drain at heater

Reznor APD Specifications

General

Brand	Reznor
Model	APD
Category	Gas Heater
Language	English