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Connection of Heat Exchangers, Condensate Outlet
Steam Humidification
Steam humidification is only delivered as an accessory. Steam
humidification is installed into the inlet air duct line. Air ducts lea-
ding through cold areas must be insulated to avoid condensation.
The entire humidification assembly (steam generators, including
steam distribution piping) should be situated in a non-freezing
room. Otherwise, anti-freeze protection must be installed.
The following minimum distances (distances between the steam
humidifier and the following air-handling unit components, where
H represents the minimum evaporating distance calculated for the
given conditions) must be observed to ensure proper operation
of the steam humidifier:
Humidistat piping, humidity sensor, temp. sensor: 5x H
Very fine filter: 2.5 x H
Heating elements, filter: 1.5 x H
Duct branch piece, duct elbow, air outlet, fan: 1x H
Notes:
The steam generator can be noisy (switching of solenoid valves);
therefore, it is advisable to install it away from quiet areas. 100°C
hot and heavily mineralized water is drained from the steam
humidifier. If the H value is not known, it is advisable to make the
calculation with a minimum value of 1.0 m.
Condensate Drainage
Stainless trays for collection of the condensate are installed inside
the compact air-handling unit in places where condensation is
expected. The tray outlet is routed through the lower panel and
terminated with a neck and the DN40 connection. The condensate
drainage system is connected to this outlet.
The condensate drainage kits are available as optional accessories.
A separate condensate drainage kit must be used for each indivi-
dual block. The siphon height depends on the total pressure of the
fan, and ensures its proper functioning. The type of condensate
Figure 12 – Condensate draining
8
draining kit must be designed in the course of the air-handling
unit calculation. The standard CAKE unit condensate drainage is
always in negative pressure.
The correct installation and correct minimum level heights have
crucial influence on the correct and reliable condensate drainage
from the unit. The condensate draining piping must end in free
atmosphere, i.e. it must not end directly in the closed sewerage
system.
Before operating the air-handling unit or after being out of ope-
ration for a longer period, it is necessary to fill the siphon in each
tray with min. 0.5l of water.
If there is a risk of freezing, it is necessary to insulate the siphon and
condensate draining piping, respectively keep the ambient tem-
perature above freezing point, e.g. with an electric heating cable.
If the outdoor version of the unit is specified in the order and
includes the manufacturer's control system, the delivery includes
a heating cable.
Air-handling Duct Connection
The air ducting must be connected to the air-handling unit via an
elastic element to avoid the transfer of vibrations. The connection
of the air-handling ducting must be performed so that no load from
the air duct will be transferred to the inlet panel of the air-handling
unit. The accessories must be installed in accordance with the
air-handling unit specification and the Installation Instructions of
the manufacturers of such accessories.
No connections, including insulation and associated structures,
must prevent opening of the air-handling unit and control unit
doors, but they must allow access to the media connections
(electric connections, cooling and heating water supply and
output) and must not limit the service room needed for proper
operation and maintenance. If the compact air-handling unit is
delivered disassembled, the internal cable interconnection is
made using connectors. These connectors must be connected
when the individual unit blocks are assembled.
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