Requirements; Piping Requirements - Rheem R95P Installation Instructions Manual

GENERAL VENTING REQUIREMENTS AND
GUIDELINES
VENTING & COMBUSTION AIR REQUIREMENTS (cont.)
OVERTEMPERATURE SAFETY
SWITCHES
Furnaces are equipped with safety switches in the burner
compartment to protect against over-temperature condi-
tions caused by inadequate combustion air supply. The
switches are located in the burner compartment. If a
switch is tripped it must be manually reset after clearing
the fault condition which caused it to open.
DO NOT BYPASS, JUMPER, OR REMOVE ANY
SAFETY SWITCH FROM THE FURNACE CONTROL
CIRCUIT. IF A SAFETY SWITCH CAUSES THE FUR-
NACE TO SHUT DOWN OR OPERATE INTERMIT-
TENTLY, IT IS AN INDICATION OF A POTENTIAL
SAFETY HAZARD THAT MUST BE ADDRESSED BY
A QUALIFIED TECHNICIAN, SERVICE AGENCY OR
THE GAS SUPPLIER. DO NOT RESET SAFETY
CONTROLS WITHOUT CORRECTIVE ACTION
AND/OR VERIFICATION OF PROPER SAFE OPERA-
TION BY A QUALIFIED INSTALLER, SERVICE
AGENCY OR THE GAS SUPPLIER.
REPLACE ANY SAFETY CONTROL COMPONENT
ONLY WITH IDENTICAL OEM REPLACEMENT
PARTS
MATERIAL REQUIREMENTS

PIPING REQUIREMENTS

The combustion air and vent pipe fittings must conform to
American National Standards Institute (ANSI) and Ameri-
can Society for Testing Materials (ASTM) standards D1785
(Schedule 40 PVC), D2665 (PVC-DWV), D2241 (SDR-21
& SDR26-26 PVC), D2661 (ABS-DWV) or F628 (Sched-
ule 40 ABS-DWV). For Canada PVC, CPVC and
polypropylene can be used as long as they conform with
ULCS-636C requirements.
IMPORTANT: The plastic combustion air and venting com-
ponents are of Schedule 40 PVC. If using ABS piping, en-
sure that the solvent cement is compatible for joining PVC
to ABS components or use a mechanical connection that
can withstand the vent temperatures and is corrosion re-
sistant.
NOTE: Schedule 40 ABS-DWV pipe and fittings may be
used as an alternate to PVC pipe for the combustion air
inlet and vent pipes.
NOTE: Cellular core PVC is also approved for use. It must
be Schedule 40PVC-DWV cellular pipe for non-pressure
applications and manufactured under ASTM-F-891.
All exhaust piping must be installed in compliance with the
chapter titled; "Venting of Appliances" in the latest edi-
tion of the National Fuel Gas Code, NFPA-54/ANSI
Z223.1, CSA B149.1 (Canada), local codes or ordinances
and these instructions.
46
IN CANADA, PRODUCTS CERTIFIED FOR INSTALLA-
TION AND INTENDED TO BE VENTED WITH PLASTIC
VENT SYSTEMS (PVC, CVPC & POLYPROPYLENE)
MUST USE VENT SYSTEMS THAT ARE CERTIFIED TO
THE STANDARD FOR TYPE BH GAS VENTING SYS-
TEMS, ULC S636.
THE COMPONENTS OF THE CERTIFIED MATERIAL
MUST NOT BE INTERCHANGED WITH OTHER VENT
SYSTEMS OR UNLISTED PIPE/FITTINGS.
PLASTIC COMPONENTS AND SPECIFIED PRIMERS
AND GLUES OF THE CERTIFIED SYSTEM MUST BE
FROM A SINGLE SYSTEM MANUFACTURER AND
NOT INTERMIXED WITH OTHER SYSTEM MANUFAC-
TURER'S PARTS.
VENT TERMINATIONS ARE NOT REQUIRED TO BE
FROM THE SAME MANUFACTURER AS THE REST OF
THE VENTING BUT VENT TERMINATIONS MUST BE
ULC S636 APPROVED.
NOTE: WITH THE EXCEPTION OF THE TERMINATION
INLET AIR PIPING IS NOT CONSIDERED TO BE A
PART OF THE "VENTING SYSTEM". THE REQUIRE-
MENT THAT VENT MATERIAL BE CERTIFIED TO ULC
S636 DOES NOT APPLY TO INLET AIR PIPING.
REGARDLESS, ALL TERMINATIONS ON BOTH INLET
AND OUTLET PIPES MUST BE CONSTRUCTED FROM
COMPONENTS BUILT TO ULC-S636 REQUIREMENTS.
1. All horizontal piping must slope upward with a mini-
mum slope of ¼ inch per foot of horizontal vent so that
condensate drains back toward the furnace.
2. All horizontal runs must be supported at least every 4
feet. No sags or dips are permitted.
3. IMPORTANT: Do not common vent with any other ap-
pliance. Do not install in the same chase or chimney
with a metal or high temperature plastic pipe from an-
other gas or fuel-burning appliance unless the required
minimum clearances to combustibles are maintained
between the plastic pipe and other pipes. For Canada
PVC, CPVC and polypropylene can be used as long as
they conform with ULCS-636C requirements.
4. All vent installed through unconditioned spaces where
below-freezing temperatures are expected should be
insulated with an approved insulating material such as
Armaflex or Rubatex insulation may also be used as
long as there is no heat tape applied to the vent pipe.
For horizontal runs where water may collect, wrap the
vent pipe with self-regulating 3 watt or 6 watt heat tape.
The heat tape must be U.L. listed and installed per the
manufacturer's instructions. NOTE: Never cover heat
tape with insulation.
5. The minimum vent pipe length is 5 feet [1.5m].
6. IMPORTANT: No part of the combustion air and/or
vent pipes may be installed underground.