Noritz EZ98DV - Page 21

21
Here
[DIP Switch Adjustment]
Vent length condition
DIP switches
#7 #8
①Less than 33 ft using 2 in. (50 mm) pipe OFF OFF
②33 ft or more using 2 in. (50 mm) pipe ON OFF
③Less than 75 ft using 3 in. (75 mm) pipe OFF ON
④75 ft or more using 3 in. (75 mm) pipe ON ON
Maximum Vent Length Configurations (For Flex
Vent 2 in. Conversion Kit)
Maximum Vent Length Example:
• Actual Vent Length = 13 ft (3.9 m) (with DIP
switch set at “Short length” condition)
• Actual Vent Length = 25 ft (7.5 m) (with DIP
switch set at “Long length” condition)
[Vent length Calculation example]
Step 1:
Vent Diameter
2 in.
Step 2:
Straight pipe length
(Vertical length + Horizontal length)
17 ft
Step 3:
Number of elbows
90° elbows: 2
45° elbows: 2
Step 4:
Calculate equivalent length
90° elbows: 2 × 5 ft = 10 ft
45° elbows: 2 × 3 ft = 6 ft
Step 5:
Total vent length
(Add Step 2 and Step 4 together)
17 ft + 16 ft = 33 ft
Step 6:
Check [DIP Switch Adjustment] and select DIP
switch settings.
②[33 ft or more using 2 in. (50 mm) pipe]
(i.e., turn ON DIP switch #7)
Maximum Vent Length Configurations (For flexible
pipe for chimney)
[DuraVent® - Flex Through Chimney w/ Air Intake
(Only 3 in.)]
The vent length condition setting depends on
the flexible pipe length, the rigid pipe length and
number of elbows. Calculate an each ventilation
system equivalent length, then adjust the DIP
switch.
Vent
length
condition
DIP
switch
#7
Maximum equivalent
vent length*
V (Vertical)
+
H (Horizontal)
Equivalent
length
Short
length
OFF < 50 ft (15 m)
Flexible pipe:
1 ft (0.3 m)
Rigid pipe:
1 ft (0.3 m)
90° elbow:
5 ft (1.5 m)
45° elbow:
3 ft (0.9 m)
Long
length
ON 50 ft (15 m)–75 ft (22.5 m)
* The maximum vent length includes elbows.
Here
Here
Vent length
DIP switches
#7 #8
Short length 5 ft (1.5 m) - 15 ft (4.5 m) OFF OFF
Long length 15 ft (4.5 m) - 35 ft (10.5 m) ON OFF
• Equivalent vent length calculation example:
[Example 1]
- Vent Size: 3 in.
- V (Vertical length): 20 ft
- H (Horizontal length): 6 ft
- 90° elbow: 2
1 ft × 20 + 1 ft × 6 + 5 ft × 2 = 36 ft
 
Select “Short length”
[Example 2]
- Vent Size: 3 in.
- V (Vertical length): 35 ft
- H (Horizontal length): 10 ft
- 90° elbow: 3
1 ft × 35 + 1 ft × 10 + 5 ft × 3 = 60 ft
 
Select “Long length”
Venting the Water Heater