Thermo Pride CLHS1-050P36N Installation And Operation Manual page 15

All installations and services must be performed by qualified service personnel.
6. The maximum permissible length of piping (consisting of a combination of straight pipe and a
corresponding number of elbows) permitted is:
•
75 equivalent feet, for the exhaust vent system, and
•
75 equivalent feet, for the combustion air intake system
7. The maximum quantity of Schedule 40 series, type DWV thermoplastic pipe elbows allowed in each system
is listed in Table 2. When counting pipe elbows, this excludes all elbows, or equivalent pipefittings, used
inside the furnace jacket in addition to those used to construct the termination. Furthermore, a credit of 5-
feet of straight pipe may be taken for each elbow, up to maximum of three (3) elbows, which is dropped
from the maximum permissible number for each system.
Thermoplastic Pipe
Vent Size (Nominal)
Furnace Model
CLHS1 / CLHX1-50
CLHS1 / CLHX1-75
CLHS1 / CLHX1-100
CLHS1 / CLHX1-125
Superscripts:
1
Two (2) 45° elbows can be substituted for one (1) 90° elbow.
Care should be taken to design the shortest possible intake and exhaust systems. Each system should contain
as few elbows as possible to insure the satisfactory operation of the furnace. However, system length should
never be less than 5 ft of pipe with two (2) 90 deg. elbows. This is separate from the elbows used at the
termination and those inside the furnace cabinet. For best overall operation of the combustion system, we
recommend the actual equivalent lengths for both the constructed intake and the exhaust systems have
approximately the same value.
8. Use a saw designed to cut thermoplastic pipe. All cuts should be made at right angles to the pipe wall.
Smooth jagged edges and remove all burrs and strings. All pipe joints must utilize standard PVC
Schedule 40 series, DWV type elbows, couplings, and fittings. Clean all pipe surfaces at connections
using a fine abrasive material or approved PVC cleaner (primer). Secure all pipe joints using suitable
permanent PVC pipe solvent cement. Joints are NOT to be made by simply gluing raw edges of butted
together vent pipe.
Piping joints inside the furnace vestibule should be sealed with silicone caulk, rather than pipe cement, to
allow for disassembly and removal of piping, if necessary, during maintenance.
Seal the vent installation by caulking the gap around the two (2) holes where the thermoplastic pipes pass
through the wall.
NOTICE: Use silicone caulk to seal the Combustion Air pipe as it passes through the 2" Intake Air
Flange.
9. Vent connections shall be checked for leakage with the furnace running. Use a mild soap and water solution
to check for leaks.
2 in. Diameter IPS
Exhaust or Maximum
Intake Qty. of
Pipe Len. Exhaust
1
(ft.) Elbows
35 8
Not Permitted
TABLE 2
15
3 in. Diameter IPS
Maximum Exhaust or
Qty. of Intake
Intake Pipe Len.
1
Elbows (ft.)
8 -
35
Maximum Maximum
Qty. of Qty. of
Exhaust Intake
1 1
Elbows Elbows
- -
8 8