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8.6
Fan speed adjustment
After installing the appliance, the minimum
power fan speed must be adjusted to
compensate for variation in vent pipe length.
Before adjusting the fan speed it is necessary to verify the
admission / exhaustion system, calculating the total length of
the exhaust pipes and quantity of elbows.
Pressure drop equivalence of the conducts and exhaustion
accessories.
Description
30° elbow
45° elbow
90° elbow
exhaust pipe per meter
Horizontal vent kit
Table 15
8.6.1 Total equivalent vent length calculation Ø80 mm
How to calculate the total length of the exhaust conduct:
▶ Determine the total length of all straight sections of vent
pipe and enter in Table 16, line 1.
▶ Count the number of 90° elbows used, multiply by 1m, and
enter that value in Table 16, line 2. (Do not count non-
concentric terminals and first elbow used on intake and
exhaust ).
▶ Count the number of 45° elbows used, multiply by 0.5m,
and enter that value in Table 16, line 3.
▶ Count the number of 30° elbows used, multiply by 0.4m,
and enter that value in Table 16, line 4.
Do not count non-concentric terminals and
first elbow used on intake and exhaust.
▶ Repeat the previous procedure to calculate the total length
of the admission of air conduct. Insert values in Table 17.
▶ Sum the total of the Table 16 with the total of the Table 17
and to put the result in the line 6 of the Table 17.
This is the total equivalent vent length.
Therm 6000S
Equivalence in meters
Ø80/80mm
0.4m
0.5m
1m
1m
-
Exhaust
1
Straight section length
2
90° elbows (qty)
3
45° elbows (qty)
4
30° elbows (qty)
5
Sub-total:
Table 16
Intake
1
Straight section length
2
90° elbows (qty)
3
45° elbows (qty)
4
30° elbows (qty)
5
Sub-total:
6
Total equivalent vent length=
Table 17
Example
Exhaust:
•
5 units of 1m straight sections
•
1 unit of 1m straight sections
– Total length = 6 meters
•
2 - 90° elbows
Intake:
•
4 units of 1m straight sections
– Total length = 5 meters
•
2 - 90° elbows
Example table:
Exhaust
1
Straight section length
2
90° elbows (qty)
3
45° elbows (qty)
4
30° elbows (qty)
5
Sub-total:
Table 18
Installation instructions | 31
___ x 1 =
________
___x 1 =
________
___x 0.5 =
________
___x 0.4 =
________
________
___ x 1 =
________
___x 1 =
________
___x 0.5 =
________
___x 0.4 =
________
________
________
6 x 1 =
6
_1_ x 1 =
1
_0_ x 0.5 =
0
_0_ x 0.4 =
0
7
6 720 800 095 (2015/11)
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