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Maintenance and service
33
6.7 Fan speed adjustment
Installation adjustment: Flue pipe length setting
for minimum power - P2.
After installing the GWH 2400 ES, the minimum power
fan speed must be selected to compensate for variation
in vent pipe length.
Total vent length calculation
B Determine the total length of all straight sections of
vent pipe and enter in table 17, line 1.
B Count the number of 90° elbows used and enter that
value in line 2. (Do not count end terminal and first
elbow after the appliance).
B Count the number of 45° elbows used and enter that
value in line 3.
B Repeat steps 1 through 3 for air intake pipe and enter
those values in the intake section of table 17.
B Add line 4 from Exhaust to line 4 of Intake and enter
result in line 5.
This is the total equivalent vent length.
Example
Exhaust
• 7 - 3' straight sections
• 1 - 1' straight section
Total length 22'
• 2 - 90° elbow.
Intake
• 5 - 3' straight sections
Total length 15'
• 2 - 90° elbows.
Example
Note: Do not count 1st elbow and terminators
Exhaust
1
Straight section length __ x 1 = ____
2
90° elbows (qty) __ x 2.5 = ____
3
45° elbows (qty) __ x 1.25 = ____
4 Total:
____
Intake
1
Straight section length __ x 1 = ____
2
90° elbows (qty) __ x 2.5 = ____
3
45° elbows (qty) __ x 1.25 = ____
4
Total: ____
5
Total equivalent vent length = ____
Table 17Determining vent length combination (see
example in Table 18)
Exhaust
Straight section length
(feet)
22 x 1 = 22
90° elbows (qty) 1 x 2.5 = 2.5
45° elbows (qty) 0 x 1.25 = 0
Total: 24.5
Intake
Straight section length
(feet)
15 x 1 = 15
90° elbows (qty) 1 x 2.5 = 2.5
45° elbows (qty) 0 x 1.25 = 0
Total: 17.5
Total equivalent vent length = 42
Table 18Determining vent length combination example
i
Total maximum length not to exceed 52
ft.