18-CD33D1-4
15
Installer’s Guide
NOTE:
It is recommended that the first joints from the furnace
be connected and sealed with high temperature RTV.
This will enable the pipes to be removed later without
cutting.
Be sure to properly support these joints.
BONDING OF PVC
Commercially available solvent cement must be used to
join the pipe and fittings. Follow instructions on the con-
tainer carefully.
Procedure for Cementing Joints:
1. Cut pipe square, remove ragged edges and burrs.
Chamfer end of pipe, then clean fitting socket and
pipe joint area of all dirt, grease, moisture or chips.
2. After checking pipe and socket for proper fit, wipe
socket and pipe with cleaner-primer. Apply a liberal
coat of primer to inside surface of socket and outside
of pipe.
DO NOT ALLOW PRIMER TO DRY BEFORE AP-
PLYING CEMENT.
3. Apply a thin coat of cement evenly in the socket.
Quickly apply a heavy coat of cement to the pipe end
and insert pipe into fitting with a slight twisting move-
ment until it bottoms out.
4. Hold the pipe in the fitting for 30 seconds to prevent
tapered socket from pushing the pipe out of the fit-
ting.
5. Wipe all excess cement from the joint with a rag. Al-
low 15 minutes before handling. Cure time varies ac-
cording to fit, temperature and humidity.
TABLE 7
PLASTIC PIPE DESIGNATIONS
PVC
ASTM STANDARD
PIPE TYPE
ALLOWABLE TEMPERATURE
MARKING
F891
CELLULAR CORE
*158
ASTM F891
D2665
DWV PIPE
**158
ASTM D2665
D1785
SCH 40, 80, 120
**158
ASTM D1785
D2241
SDR SERIES
**158
ASTM D2241
CPVC
ASTM STANDARD
PIPE TYPE
ALLOWABLE TEMPERATURE
MARKING
D2846
CPVC 41
**212
ASTM D2846
F441
SCH 40, 80
**212
ASTM F441
F442
SDR SERIES
**212
ASTM F442
ABS
ASTM STANDARD
PIPE TYPE
ALLOWABLE TEMPERATURE
MARKING
D2661
SCH 40 DWV
***180
ASTM D2661
F628
SCH 40 DWV CELLULAR CORE
***180
ASTM F628
* - Allowable temperatures based on classifications covered in ASTM D4396 [Deflection Temps Under Load (264 PSI)]
** - Allowable temperatures based on classifications covered in ASTM D1784 [Deflection Temps Under Load (264 PSI)]
*** - Allowable temperatures based on classifications covered in ASTM D3965 [Deflection Temps Under Load (264 PSI)]
PVC VENT FITTING MATERIAL
These fittings are available from your Gas Furnace
Distributors.
Straight Pipe Sections, Couplings, 45° Elbows, 60° El-
bows, 90° Elbows, Vent or Sanitary Tee, or other neces-
sary fittings may be 2", 2½", 3", or 4" diameter. The allow-
able materials are shown in Table 7.
VENT FITTING MATERIAL – PLASTIC
Gas and liquid tight single wall vent fittings, designed for
resistance to corrosive flue condensate, MUST be used
throughout.
Listed in Table 8 & 9 are 2", 2½", 3", and 4" size fittings
that meet these requirements. The materials listed are
various grades of PVC and ABS plastic.
PIPE JOINTS: All joints must be fastened and sealed to
prevent escape of combustion products into the building.
IMPORTANT:
Products installed in Canada must use vent sys-
tems that are certified to the Standard for Type BH
Gas Venting Systems (ULC S636) for Class II-A vent-
ing systems (up to 65°C). Components of the vent
system must not be interchanged with other vent
systems or unlisted pipe or fittings. Plastic compo-
nents, specified primers, and glues must be from a
single system manufacturer and not intermixed with
other system manufacturer's vent system parts. In
addition, the first three feet of the vent pipe must be
visible for inspection.
