John Wood Noritz Concentric Vent - NR98-DVC (N-0751M) - Manual (Page 11)

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The power must be unplugged when
adjusting (pulling in or out) the connector
to switch the airflow amount.
<Maximum Vent Length Configurations>
Pulling out
Connector Connector to switch
the airflow amount
Connector to switch
the airflow amount
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0.9m (3')
0 1 2 3 4 5 6
Elbows*
Length
1.5m (5')
3m (9')
3.3m (11')
4.6m (15')
5.2m (17')
6.4m (21')
Controller
7m (23')
8.8m (29')
10m (35')
12.5m (41')
The unit can be adjusted to accommodate longer vent runs; refer to the below table to find the
maximum vent length based on the number of elbows. If the maximum vent length falls in the shaded
area of the table, the airflow adjustment connector must be pulled out as illustrated to the right.
Note: When the airflow connector is removed, the BTUH input of the appliance will be reduced by
up to 8%.
Maximum Vent Length Adjustment Connector
- Two 90 elbows, maximum length = 3 m (9 ft )
(with connector installed)
- Two 90 elbows, maximum length = 9 m (29 ft)
(with connector removed)
[Maximum Vent Length Example]
* Two 45 elbows count as one 90 elbow.
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Elbows*
Length
* Two 45 elbows count as one 90 elbow.
* Regardless of the vent terminal used, the exhaust ring must be
removed for vent lengths in the shaded region of the table.
* There is no exhaust ring for Propane (LP) models.
<Pulling out the exhaust ring>
If the maximum vent length falls in the shaded
area of the table, the exhaust ring must be re-
moved for Natural Gas models.
Additional Adjustment for Natural Gas Models
<How to remove the exhaust ring>
Grab the tab with pliers and pull the ring
straight out.
Tab
Exhaust pipe
Intake pipe
Exhaust ring
Sectional view
Unit
0 1 2 3 4 5 6
0.9m (3')
1.5m (5')
3m (9')
3.3m (11')
4.6m (15')
5.2m (17')
6.4m (21')
7m (23')
8.8m (29')
10m (35')
12.5m (41')