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2.8 Hydraulic connection
2.8.1 Generalities on condensate connection
Fit all condensate drains with a siphon (plate heat exchanger and cooling coil optional). Siphon height is calculated according to the under or excess
pressure in the apparatus, in order to enable the evacuation of condensates and prevent leakage of air from the unit.
Caution:
the siphon must always be fi lled with water before the unit is started up. Risk of water evaporation during summer months. In order to have
greater water capacity, it is advisable to use a minimum of a Ø32mm diameter siphon (for VEX520-525-530 sizes, use a Ø20 to Ø32 reducing sleeve).
Caution, if risk of freezing in winter, be
prepared to insulate the siphon and the
drainage components if they are in an
unheated atmosphere.
Siphon calculation
"P" being the maximum pressure in Pa inside an operating unit, with a safety factor increase of 20 % (10 Pa=1mm of water column). Warning, be
prepared for more load reductions, (higher or lower pressure) with clogged fi lters!
Section of the unit with low pressure (at exchanger connection):
H1(mm) >= P/10
Hs >= Px0,075
Example: calculating a low pressure of 500 Pa, i.e. P=600 Pa with safety coeffi cient.
H1 >= 600/10
→
H1 >= 60 mm et
Hs >= 600x0,075
→
Hs >= 45mm