16 EN/01.2019/G22 © STULZ GmbH – all rights reserved
EC TOWER TECHNICAL MANUAL
ECD 91 - Front
Steam cylinder
Steam nozzle
5.4 EC Tower method of operation
Temp./humidity
sensor B01
Electric heater
Steam cylinder (detailed view)
Stop valves
Junction box 2:
For communication with the
outdoor unit
Fan
Air filter
Junction box 1
The unit described here is the indoor unit of an air conditioning system. The main components of the indoor
unit are a fan, a heat exchanger and an electric heater.
The unit is operated solely via the C7000AT controller in the front panel and the master switch in junction box
1. The air inlet contains a temperature/humidity sensor, which supplies the measured values for temperature
and humidity control. Cooling is achieved in compressor mode, in combination with the outdoor unit.
The EC Tower is controlled by the integrated C7000 I/O controller. The operating strategy allows a total of
10 EC Towers to be controlled from a single unit. In all, 20 users (10 C7000AT controllers and 10 C7000 I/O
controllers) can be integrated in the bus.
The EC Towers can be installed individually, although in this case the control line must not exceed the maxi-
mum overall length of 1000 m.
Dehumidification
Dehumidification is achieved by lowering the speed of the fan. At a constant cooling capacity, the temperature
of the air flowing through the heat exchanger drops below dew point. The humidity in the air condenses on the
heat exchanger, collects in the condensate tray and is discharged via the condensate drain.
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