Fan Speed Adjustment - Worcester GREENSPRING CWi47 Installation And Operating Instructions Manual

9.7

FAN SPEED ADJUSTMENT

The maximum flue length when using the condensfit 80/
125 flue gas system is 8 metres.
In all cases, the equivalent flue length calculation and fan
speed adjustment must be carried out.
After installing the appliance, the minimum
power fan speed must be adjusted to
compensate for variation in flue pipe length.
Before adjusting the fan speed it is necessary to verify
the flue gas system, calculating the total length of the
flue pipes and quantity of elbows.
Pressure drop equivalence of the flue pipes and flue
accessories.
Equivalence in meters Ø80/125mm
Description Ø80/125mm
7-719-003-665
7-719-003-664
90°
7-719-003-702
7-719-003-666
7-719-002-431
Tab. 23 Equivalent length
9.7.1 CALCULATION OF THE CONCENTRIC FLUE
PIPE LENGTH Ø80/125 MM
How to calculate the total length of the concentric flue
pipes:
B Determine the total length of the concentric flue
pipes and enter in table 24, line 1.
B Count the number of 90° elbows used, multiply by
2m, and enter that value in table 24, line 2.
B Count the number of 45° elbows used, multiply by
1.5m, and enter that value in table 24, line 3.
Do not count terminals and first elbow.
6 720 646 322 (2012/05)
Length (m)
°
1.5
45
2.0
0.4 to 0.6
(dependent on
actual length)
1.0
1.4
Concentric flues
1 Straight section length
2 90° elbows (qty)
3 45° elbows (qty)
4 Total equivalent flue length=
Tab. 24
EXAMPLE
Concentric conduct:
• 4 units of 1m straight sections
• 1 unit of 1m straight section
– Total length = 5 meters
• 2 - 90° elbows
EXAMPLE TABLE:
Concentric conduts
1 Straight section length
2 90° elbow (qty)
3 45° elbow (qty)
4 Sub-total:
Tab. 25
Note: Do not count terminal and first elbow.
Total maximum length for concentric flue
pipes must not exceed 8 meters.
9.7.2 ADJUSTING FAN SPEED
After obtaining the total sum of the flue pipes, proceed
as follow:
B Press ON/OFF button into OFF.
B Press and hold "Program" button and press ON/OFF
button to turn appliance ON (
Fig. 60
B As soon as '188' is displayed, release "Program"
button , and the display should read P2.
COMMISSIONING
___ x 1 = ________
___x 2 = ________
___x 1.5 = ________
________
5 x 1 = 5
_1_ x 2 = 2
_0_ x 1.5 = 0
7
Fig. 60).
6720608920-19. 1 AL
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