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Whirlpool WFCU Installation Instructions Manual page 8

90+ gas furnace
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Materials
All pipe, fittings, primer, and solvent cement must conform
with American National Standard Institute and the American
Society for Testing and Materials (ANSI/ASTM) standards.
The solvent shall be free flowing and contain no lumps,
undissolved particles, or any foreign matter that adversely
affects the joint strength or chemical resistance of the
cement. The cement shall show no gelatinization,
stratification, or separation that cannot be removed by
stirring. See "Piping and Fitting Specifications" for approved
piping and fitting materials.
Piping and Fitting Specifications
Piping and Fitting Material
Schedule 40 PVC (Pipe)
Schedule 40 PVC (Cellular Core Pipe)
Schedule 40 PVC (Fittings)
SDR-26 (Pipe)
Schedule 40 ABS (Pipe)
Schedule 40 ABS (Fittings)
Schedule 40 & 80 CPVC (Pipe)
ABS-DWV Drain Waste & Vent
(Pipe & Fittings)
PVC-DWV Drain Waste & Vent
(Pipe & Fittings)
The primers and solvents used must also meet ASTM
specifications. PVC primer is specified in ASTM F656. Use
PVC solvent as specified in ASTM D2564 and ABS solvent
cement as specified ASTM D2235. Low temperature solvent
cement is recommended. Metal or plastic strapping may be
used for vent pipe hangers.
When making ABS joints, pieces can be prepared with a
cleaner. When joining ABS to PVC materials, use PVC solvent
cement as specified in ASTM D3138.
Preferred fittings are DWV style or long sweep. Seal all joints
gas tight with appropriate cement. In areas where vent and air
intake pipes are exposed to abnormal stress or are subject to
damage, schedule 80 pipe should be used.
Use high temperature RTV silicone sealant to attach the air
intake pipe into the connector on the burner box so the air
intake pipe can be removed if service is required.
NOTE: Do not use cement.
8
The vent pipe and air intake pipe (in direct vent installations)
should be sized in accordance with the information found in the
"Vent Tables." One 90° elbow is equivalent to 5 ft of pipe.Two 45°
elbows are equivalent to one 90° elbow.The minimum length
certified for use with this furnace is 5 ft and one elbow, not
including the vent and air intake terminals.
Vent Table - 40,000 - 80,000 BTU/HR Models
ASTM Specification
D1785
F891
D2466
D2241
D1527
D2468
F441
D2661
Number of 90°
D2665
NR = Not Recommended
Vent Table- 90,000 - 100,000 BTU/HR Models
Number of 90°
NR = Not Recommended
Vent Pipe Size and Length
Vent Pipe
Minimum Pipe Diameter (in.)
Length (ft)
5
1.5 1.5
2
10
1.5
2
2
20
2
2
2
30
2
2
2
40
2
2
2
50
2
2
2.5 2.5 2.5 2.5 2.5 2.5 2.5 NR
60
2
2.5 2.5 2.5 2.5 2.5 2.5 NR NR NR
70
2.5 2.5 2.5 2.5 2.5 NR NR NR NR NR
80
2.5 2.5 2.5 NR NR NR NR NR NR NR
90
2.5 2.5 NR NR NR NR NR NR NR NR
0
1
2
Elbows
Vent Pipe
Minimum Pipe Diameter (in.)
Length (ft)
5
NR
2
2
10
2
2
2
20
2
2
2
30
2
2
2
40
2
2
2.5 2.5 2.5
50
2.5 2.5 2.5
60
2.5
3
3
70
3
3
3
80
3
3
3
90
3
3
NR NR NR NR NR NR NR NR
0
1
2
Elbows
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2.5 2.5 2.5
2
2
2.5 2.5 2.5 2.5 2.5
3
4
5
6
7
8
2
2
2
2
2.5 2.5 2.5
2
2
2
2.5 2.5 2.5 2.5
2
2
2.5 2.5 2.5 2.5
2.5 2.5 2.5 2.5
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
NR NR NR
3
3
NR NR NR NR NR
NR NR NR NR NR NR NR
3
4
5
6
7
8
2
2
2.5
9
3
3
3
NR
9

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