All installations and services must be performed by qualified service personnel.
14
Installation shall, at least, conform to the following requirements.
1.
The exhaust vent / combustion air intake terminations specified by Thermo Products, in this
manual, shall be used. Both exhaust vent / combustion air intake are to be taken from out of
doors.
2.
All plastic pipe and pipefittings sourced to complete the exhaust vent and air intake systems shall
be constructed of rigid PVC (polyvinyl chloride) thermoplastic. All components shall have a wall
thickness equivalent to Schedule 40 series materials.
In addition, all sourced PVC components shall be listed by a nationally recognized testing agency
(e.g. NSF, UL, etc.) as conforming to one (1) or more of the following design standards.
PVC Pipe Designation
Design Standard
Cellular Core
ASTM-F891
DWV (Drain-Waste-Vent) ASTM-D2665
Schedule 40
ASTM-D1785
3. The exhaust vent pipe and combustion air pipe shall be at least as large as the exhaust vent / air
intake pipe specified by Thermo Products.
Size reduction is never permissible.
The required
exhaust vent / air intake pipe sizes are:
2-inch PVC thermoplastic pipe, for models CLQS1–050/075
3-inch PVC thermoplastic pipe, for models CLQS1–100/125
4.
All horizontal runs of exhaust vent pipe shall slope upward at least ¼ inch per foot from the
internal connection inside the furnace to the vent termination, beyond the outside wall. This slope
will permit proper drainage of the condensate.
Horizontal runs of air intake pipe shall slope downward at least ¼ inch per foot from the outlet of
the last elbow or last horizontal run, before exiting the wall, to the intake termination beyond the
outside wall. This slope will permit proper drainage of any precipitation that enters the intake
pipe.
5.
The exhaust vent pipe shall be supported at every joint (no more than 4-feet between supports) to
prevent pipe blockage due to condensate trapped at a local low point, or sag, in the vent system.
6.
The
maximum permissible length of piping
(consisting of a combination of straight pipe and a
corresponding number of elbows) permitted is:
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