Daikin Modular Rotary Instructions For Installation, Use And Maintenance Manual page 41

Drain and siphon
In correspondence with the humidification sections and the thermal exchange cooling coils, the air han-
dling units are equipped with a threaded drain that protrudes laterally for about 80 mm.
In order to allow a regular flow of water, each drain must be fitted with a properly sized SIPHON
(see fig. 14).
IMPORTANT
Condensate
collection tank
14
Drain siphon
drain
valve
15
Drain siphon
Siphon
x
x+20 mm
CONDENSATE COLLECTION TANK
With an upper fan head of about 100
mm and a total static pressure ex-
ceeding 1000Pa, increase the height
of the siphon by 10 mm every 10
mm of head and every 100Pa of to-
tal static.
To avoid overflows from the collection tank
and consequent flooding of the machine as
well as the room in which it is installed, the si-
phon must have a purge valve that allows the
removal of impurities deposited on the bot-
tom.
In order not to affect the operation of the
drainage system, siphons operating under
pressure must NOT be connected to others
operating under vacuum.
The drainage pipe to the sewerage network:
• Must not be connected directly to the si-
phon. This in order to absorb returns of air
or slurry and to make the correct outflow of
2%
waste water visible.
• Must have a larger diameter at the machine
drain and a minimum inclination of 2% in or-
der to ensure proper operation.
41