Specific venting requirements, Venting and combustion air (cont'd), 4) joints and sealing 3) pipe length and diameter – Reznor SCE Unit Installation Manual User Manual
Page 8
Form RZ-NA I-SCE, Page 8
•
Minimum length between the
heater and the concentric
adapter box is 5 feet (1.5M).
Diameters of Outdoor
Concentric Pipes
4) Joints and Sealing
3) Pipe Length
and Diameter
Specific Venting Requirements
Vent Pipe
1) Type of Pipe
2) Venter Outlet and
Combustion Air Inlet
Model SCE heaters have both an inlet air and a venter outlet connection. Both are 6" diam-
eter for all sizes.
Combustion Air Pipe
• Sealed, single-wall galvanized pipe is recommended for combustion air.
• NOTE: If using 7" pipe on
Sizes 200-400 (see table
below), use a taper-type 6"
to 7" enlarger to attach the
vent pipe and a 7" to 6"
reducer to attach the
combustion air pipe.
Pipe diameter and length requirements listed for the indoor sections of pipe (between the
heater and the concentric adapter box) are in the table below. Vent pipe diameters and
maximum indoor vent lengths apply to both horizontal and vertical vents. Add all straight
sections and equivalent lengths for elbows. The total length of the straight sections and
elbows must not exceed the Maximum Length.
Pipe Diameter and
Maximum Pipe Length
Between the Heater and
the Concentric Adapter
Box
Taper-type
Reducer
Airflow
Taper-type
Enlarger
Airflow
9. Venting and
Combustion Air
(cont'd)
inches mm inches mm
feet
M
feet
M
feet
M
125
6
152
6
152
50
15
8
2.4
4
1.2
150
6
152
6
152
50
15
8
2.4
4
1.2
175
6
152
6
152
50
15
8
2.4
4
1.2
6
152
6
152
50
15
8
2.4
4
1.2
7
178
7
178
70
21
8
2.4
4
1.2
6
152
6
152
50
15
8
2.4
4
1.2
7
178
7
178
70
21
8
2.4
4
1.2
6
152
6
152
50
15
8
2.4
4
1.2
7
178
7
178
70
21
8
2.4
4
1.2
6
152
6
152
50
15
8
2.4
4
1.2
7
178
7
178
70
21
8
2.4
4
1.2
6
152
6
152
30
15
8
2.4
4
1.2
7
178
7
178
70
21
8
2.4
4
1.2
6
152
6
152
30
15
8
2.4
4
1.2
7
178
7
178
70
21
8
2.4
4
1.2
Equivalent Straight Length for a
200
225
250
45° Elbow
300
350
400
Pipe Diameter and Maximum Pipe Length from Heater to Concentric Adapter
Vent Pipe
Inlet Air Pipe
Maximum
Length
90° Elbow
Pipe Diameter
SCE
All pipe is field supplied. Requirements are listed for both the vent pipe and the combustion
air inlet pipe.
• Vent pipe approved for a Category III appliance OR single-wall, 26-gauge or heavier
galvanized (or a material of equivalent durability and corrosion resistance) vent pipe is
required between the heater and the concentric adapter box.
• Double-wall (Type B) vent pipe is required for vent terminal section. The length of
vent pipe that extends through the box and runs concentric through the combustion air
pipe must be one-piece with no joints.
Provide pipes as specified in Requirement No. 1 and seal joints as follows:
• If using Category III vent pipe run, follow the pipe manufacturer’s instructions for
joining and sealing Category III vent pipe sections.
• If using single-wall vent pipe run, secure slip-fit pipe connections using sheetmetal
screws or rivets. Seal all joints with aluminum tape or silicone sealant.
Venter Outlet Connection (diameter)
SCE
125 150 175 200 225 250 300 350 400
inches 6
6
6
6
6
6
6
6
6
mm 152 152 152 152 152 152 152 152 152
Combustion Air Inlet Connection (diameter)
SCE
125 150 175 200 225 250 300 350 400
inches 6
6
6
6
6
6
6
6
6
mm 152 152 152 152 152 152 152 152 152
The diameters of the outside (terminal) concentric pipes are shown in the concentric box
connection illustrations in FIGURE 11, page 11. The outdoor lengths depend on the instal-
lation. Outdoor vent length requirements are listed in the installation instructions for the
horizontal and vertical vent/combustion air kits on pages 12-17.
8"
203mm
5"
127mm
Inlet Air Pipe
Diameter
Vent Pipe Diameter
Model SCE - All Sizes