Rheem 96MDV Series, Installation Instructions Manual

Page: 46 / 128

Ve
nt
in
g
IMPORTANT: ONLY THE CURRENT VENT INSTRUC-
TIONS APPLY
. All 90 Plus Gas Furnaces cannot be com-
mon-vented.
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.
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
(Schedule 40 ABS-DWV). For Canada PVC, CPVC and
polypropylene venting can be used and must conform
with ULCS-636C requirements.
IMPORTANT:
The plastic combustion air and venting
components are of Schedule 40 PVC. If using ABS piping,
ensure 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
resistant.
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
edition of the National Fuel Gas Code, NFPA-54/ANSI
Z223.1, CSA B149.1; Canadian Natural Gas and Propane
Installation Code (Canada), local codes or ordinances
and these instructions.
1. All horizontal piping must slope upward from the fur-
nace with a minimum slope of ¼ inch per foot of hori-
zontal 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
appliance. Do not install in the same chase or chim-
ney with a metal or high temperature plastic pipe from
another gas or fuel-burning appliance unless the re-
quired minimum clearances to combustibles are main-
tained between the plastic pipe and other pipes. For
Canada PVC, CPVC and polypropylene can be used
as long as they conform with ULCS-636C require-
ments.
4. All vent installed through unconditioned spaces where
below-freezing temperatures are expected must be in-
sulated with an approved insulating material. Materials
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 col-
lect, wrap the vent pipe with self-regulating 3 watt or 6
watt heat tape. The heat tape must be U.L. listed and
VENTING & COMBUSTION AIR REQUIREMENTS (cont.)
GENERAL VENTING REQUIREMENTS AND
GUIDELINES
!
WARNING
DO NOT BYPASS, J
UMPER, 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 OPER-
ATION BY A QUALIFIED INSTALLER, SERVICE
AGENCY OR THE GAS SUPPLIER.
REPLACE ANY SAFETY CONTROL COMPONENT
ONLY WITH IDENTICAL OEM REPLACEMENT
PARTS
!
WARNING
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 REQUIRE-
MENTS.
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