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4.5.5 Maximum Vent Length
(indoor models only)
Default vent length is set for 21-41equivalent ft of
venting. If equivalent vent length is 20 ft or less,
parameter 10 must be changed to "b"
1. Determine the number of 90 degree elbows
in the vent system. (Two 45 degree elbows
count as one 90 degree elbow.)
2. Refer to the table to find the maximum vent
length based on the number of elbows.
Table 11
Number of
Long (99-A)
90° elbows
(Default)
21-41 ft
0
(6.4-12.5 m)
16-35 ft
1
(4.9-10.7 m)
9-29 ft
2
(2.7-8.8 m)
3
23 ft (7.0 m)
4
17 ft (5.2 m)
5
11 ft (3.4 m)
6
5 ft (1.5 m)
See "Parameter Settings Table" in section 4.10
for more information.
4.5.6 Venting Installation
(indoor models only)
Install the venting termination according to the
diagrams and instructions below.
Horizontal Termination using the Condensate
Collector
Condensation
Figure 21
Slope the venting 1/4 in. per foot toward the
appliance according to the vent manufacturers
installation instructions. Dispose of condensate
per local codes.
28
Short (99-b)
0-20 ft
(0-6 m)
0-15 ft
(0-4.6 m)
0-9 ft
(0-2.8 m)
3 in. (75 mm)
minimum
Rinnai Tankless Water Heater Installation and Operation Manual
Horizontal Termination without using the
Condensate Collector
WARNING
If the condensate collector is not used, the
supplied cap must remain installed to prevent
exhaust gases and condensate from entering
the building. The cap is supplied on the
appliance. When the condensate connector
is not used, slope the venting 1/4 in. per
foot away from appliance according to vent
manufacturer's installation instructions.
Figure 22
Maximum
Height*
Figure 23
* The condensate collector must be used in
horizontal terminations if a vertical rise in the
vent system exceeds 5ft.
Regions of cold climate will create more
condensate in the vent system. The condensate
collector should be used in cold climates.
If more than one elbow is used in the vertical
section the condensate collector must be used.
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