All installations and services must be performed by qualified service personnel.
10
NOTES:
1
The drain tee supplied with CHX1/CDX1 furnaces count as 1 elbow.
2
(2) 45° elbows can be substituted for (1) 90° elbow.
Care should be taken to plan out the vent system to be as short as possible (but not shorter than 8 ft.) and
to contain as few elbows as possible to insure the best possible operation of the furnace.
8. A hack saw may be used to cut the PVC pipe. It must be cut smoothly at right angles with all burrs
removed. All joints must use standard PVC Schedule 40 elbows and couplings. Joints are not to be
made by gluing and butting together the cut or raw edges of the vent pipe. The joints inside the
vestibule should be sealed with a silicone caulk to allow for maintenance.
Note: Do not use silicone caulk to seal the PVC sleeve or coupling to the metal air intake collar on
the burner box. The screw securing the sleeve or coupling to the collar is sufficient.
9. Vent connections shall be checked for leakage with the furnace induced draft blower running and with
the vent termination blocked. A mild soap and water solution may be used to check for leaks.
10. Vent pipe passing through an unheated space must be insulated with 1.0” thick foil faced fiberglass
insulation or it’s equivalent to prevent freezing of any condensate within the pipe.
11. Minimum clearance from the PVC pipe to combustible material is zero inches.
12. Screens are not required by Thermo Products for the vent and intake. However, optional stainless
steel screens are available from Thermo Products, should the homeowner request them.
IMPORTANT:
The CHX1/CDX1 furnace models may be vented either through the sidewall or roof. For
sidewall instructions continue reading the following section. For roof venting refer to Section III, H, of this
manual.
E. SIDEWALL VENTING
1. The maximum wall thickness through which the vent and combustion air pipes may pass is 18” and
the minimum is 2”. The maximum distance from the outer wall to the center of the elbow is 12” (See
Figure 2).
Figure 2
Summary of Contents for CDX1-100N
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