Installation instructions (cont'd), Venting the heater – Reznor B Option - Power Venter Installation User Manual
Page 10
Form I-F/B-PV, Page 10
8. Venting the Heater
Venter Outlet - The addition of the power venter changes the vent system
requirements. It is recommended that a 12-18" piece of straight pipe be con-
nected to the venter before attaching an elbow. Venter outlet sizes and vent
system length requirements are listed in the following tables.
DANGER: All gas-
fired units must
be vented to the
atmosphere.
See Hazard Levels,
page 2.
Vent Outlet Diameters with Option CA Power Venter
Models
Size
Outlet Diameter
F (Fan) or
B (Blower)
25 - 200
4" Round
250 - 400
6" Round
Size
Maximum Vent Lengths *
(without condensation)
(possible condensation**)
Diameter
Maximum Length
Diameter
Maximum Length
ft
M
ft
M
25
3" ***
30
9
3" ***
50
15.2
4"
30
9
4"
50
15.2
50
3" ***
30
9
4"
75
22.9
4"
40
12.2
75
4"
50
15.2
5" ***
75
22.9
100
4"
50
15.2
5" ***
75
22.9
125
4"
75
22.9
8"***
100
30.5
130
4"
75
22.9
5" ***
100
30.5
165
4"
75
22.9
5" ***
100
30.5
200
4"
50
15.2
6" ***
100
30.5
250
4" ***
15
4.6
6"
100
30.5
5" ***
40
12.2
6"
75
22.9
300
6"
100
30.5
7" ***
125
38.1
400
6"
100
30.5
N/A
N/A
N/A
7" ***
125
38.1
* Deduct 15 feet (4.6M) for each
90° elbow and 7 feet (2.1M)
for each 45° elbow. Elbow
deduction does not apply to
condensation determination.
** 65°F surrounding vent pipe and
heater on cycle time of three
minutes or greater.
*** Connect a taper-type "enlarger"
or "reducer" to the venter outlet.
Vent cap must be the same
diameter as the vent system.
Vent Run - Use either vent pipe approved for a Category III heater or appropriately sealed 26-gauge galva-
nized steel or equivalent single-wall pipe.
Use only one of the flue pipe diameters listed in the Vent Length Table for the size of heater being installed.
If the vent pipe passes through a combustible roof, ceiling, side wall, or floor, provide standard wall thimble as
made by the vent pipe manufacturer. When venting through a roof, provide adequate height to clear possible
snow level. Refer to the illustrations in
FIGURE 15.
Vent System Joints - Vent system joints depend on the installation and the type of pipe being used.
•
If using single-wall, 26-gauge or heavier galvanized pipe, secure slip-fit connections using sheetmetal
screws or rivets. Seal pipe joints either with tape suitable for 550°F or high temperature silicone sealant.
•
If using Category III vent pipe, follow the pipe manufacturer's instructions for joining pipe sections. When
attaching Category III pipe to the venter outlet or the vent cap, make secure sealed joints following a pro-
cedure that best suits the style of Category III pipe being used. (See instructions on top of page 11.)
Vent System Support - Support lateral runs every six feet, using a noncombustible material such as strap
steel or chain. Do not rely on the heater for support of either horizontal or vertical vent pipe.
Vent Terminal (Pipe and Vent Cap) - The vent system must be terminated with a suitable vent cap. The vent
terminal and vent cap must be the same diameter as the vent run. Any commercially available cap listed for
use as a vent cap for fuel burning appliances is acceptable. For optimum stability under wind conditions, a
Reznor Option CC1 vent cap is recommended.
See the illustrations in
FIGURE 15 for requirements of both vertical and horizontal vent termination. Using
either single or double wall vent terminals is illustrated. Many local codes require the use of double-wall (Type
B) vent for the portion of vent pipe (terminal) on the outside of the building.
Installation
Instructions
(cont'd)