11
Fig.10. Example of a feeding water exchanger
4.4. Draining out condensate
The outlet condensate connections, led outside the AHU's casing are assembled in the drain plates of glycol,
cross-
flow and rotary exchangers (the diameter of drain pan connection pipe is 32mm).
Siphons, which are designed to drain out condensed water from the exchangers at different pressure of the
section and environment, should be connected to the drain connections.
Drain siphons or siphon parts for SVS AHUs
are not supplied as a standard delivery.
Siphon’s usable „H" height depends on the pressure difference between the AHU section, where the
condensate is drained during th
e operation and under the ambient pressure. „H" dimension is provided in
mm and must be higher than the pressure difference expressed in mmH
2
O.
Table 3. Siphons' operational height
No.
Total fan's pressure
[Pa]
Size
H [mm]
1.
< 600
60
2.
600-1000
100
Fig.11. Ball siphon
It is allowable to join together siphons of various units with one drain interceptor provided that the interceptor is
equipped with air-escape. Before starting the AHU, fill the siphon with water.
It is also possible to use a special type of mechanical pump to force the removal of condensate.
