Instructions for unloading on the site as well as installation and connection |
31
I.4.6
Video instruction — draining condensate water from heat exchanger
Condensate from the plate heat exchanger or run-around-coil is collected in the drip tray. Heavy negative air pressure
in this section prevents the water from flowing out of the drainpipe. A water trap with sufficient closing level of the
water is essential to ensure that condensate water flows out of the unit. The closing level of the water trap must be es-
timated correctly to ensure safe escape of the water (see the illustration and estimate the minimum closing level ac-
cording to the table).The pipe diameter of the water trap and sewage system must be identical to the pipe diameter of
the drainage outlet from the tray.
Note:
Instructions about easy, quick and safe assembly and cleaning of water trap is displayed in a 2–minutes
video. The video is available on YouTube.
https://youtu.be/5qMswv2c0SQ
Remember to check that there is water in the water trap.
Table 1 Negative pressure P (Pa)
P
H1
Mini-
mum
H2
H1 minus
H2
Closing
level
Excess
height for
flow
500 Pa
100 mm
40 mm
60 mm
10 mm
750 Pa
150 mm
55 mm
95 mm
20 mm
1.000
Pa
190 mm
70 mm
120 mm
20 mm
Necessary closing level that is H1 minus H2 — for exam-
ple for the negative pressure 500 Pa — equal to 50 mm
of water column is 60 mm because the 50 mm corre-
sponds to the negative pressure is lifting the water 50
mm and an excess height of 10 mm enables the water to
flow out through the water trap into the sewage system.
With the negative pressure at 750 Pa, an excess height of
20 mm enables the water to flow out through the water
trap into the sewage system.
This type of water trap for sections with negative pres-
sure and a ball that is sucked down into its seat for block-
age of air flow into the section is available from
Systemair. The above-mentioned heights — H1 and H2 —
also apply to this type of water trap. The great advantage
of this type of water trap for sections with negative pres-
sure is that this type does not require water at the bottom
to close for air flow backwards into the section. Conden-
sate water will escape through this type of water trap —
even after long periods without any water to close for air
flow backwards through the trap.
This water trap is optional and must be ordered sepa-
rately. Installation of water trap is not included.
The water trap in this picture has the delivered standard
length of H1 of 150 mm and with the adjustable length of
H2 adjusted to 55 mm, this set-up allows water to flow
out at a negative pressure of 750 Pa, because the closing
level that is H1 minus H2 is 95 mm and with 75 mm cor-
responding to the negative pressure lifting the water 75
mm and an excess height of 20 mm that enables the
water to lift the ball and to flow out through the water
trap into the sewage system..
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