AL-KO AT4F Series, Operating And Assembly Instruction Manual

Page: 71 / 140

Subject to changes in line with technical progress!
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Assembly
5.9.2 Intake and exhaust hood (option)
„
For a weatherproof version, an optional intake and exhaust hood can be ordered.
„
Here, it must be ensured on-site that no ATEX zone or no higher ATEX zone can arise than the ATEX zone defined on
the AT4F ATEX unit for outside use.
„
For units without a factory-delivered intake hood, a drain tray must be provided on site at the unit inlet and in the duct.
„
The on-site ducting must ensure that the installation site is suitable for the ATEX unit version.
„
To avoid short-circuit currents, these position and orientation of the intake and outlet ends must be adjusted, de-
pending on the local conditions, using the on-site duct sections. The applicable rules/standards regarding the fresh
air intake and the exhaust air outlet must be complied with in this regard.
5.9.3 Condensate drain connection via siphon
„
In accordance with VDI 6022, a water drain and siphon is provided on a condensate pan (recommended with back -
flow protection).
„
Condensate drain lines must be connected to the drain system with a siphon. Direct connection of water drains to
the drain system is not permitted.
ATTENTION
The drain pipe and the siphon are to be kept frost-proof on-site.
NOTE
The standing height of the respective siphon must be designed for the underpressure or over-
pressure of the air handling unit to prevent suction or blowing out of air from the closed drain
pipe. For a weatherproof version, the pipe trace heating is to be provided. The corresponding
standards must be complied with. The pipeline must be protected against environmental in-
fluences.
Snake siphon (overpressure or vacuum)
The snake siphon is a siphon to be filled for draining AC units in the area of the cooler, humidifiers or other wet areas
with overpressure relative to the environment.
Drain pipe 40 on-site
H2
H1
H3
Base tray with floor drain
40
40
30
Fig. 52 Connection of the condensate drain with snake siphon