Stulz EC Tower ECD 91 - Alarm Signal; Status of the Interface III K (Master;Slave); Status Signals

151 © STULZ GmbH – all rights reserved EN/01.2019/G22
ec tower technical manual
4.3.3 Status of the InterfaceIIIk (master/slave)
DIP switch S21 determines the status of the InterfaceIIIk in the X/Y remote control bus. If the InterfaceIIIk
is to be used as a remote control, it needs to be configured as a slave.
Master
The InterfaceIIIk controls the indoor air conditioning unit as the master. The wired remote control has slave
status. Operating parameters cannot be read out on the wired remote control.
Slave
The wired remote control controls the indoor air conditioning unit as the master. The operating parameters
can be read out on the wired remote control. The InterfaceIIIk has slave status. Depending on the program,
certain parameters can be displayed on the InterfaceIIIk.
NOTE
There can only ever be one master in an X/Y remote control bus.

as slave, and vice versa.

users in the X/Y remote control bus.
If more than one user in the same X/Y remote control bus is configured as a master or slave,
no communication is possible between users. This permanently disrupts operation!
Master/slave operation is possible in all programs.
4.3.4 Alarm signal
Every alarm registered by the indoor air conditioning unit and every internal board alarm is emitted via digital
output X4a-K1. In addition, the error code can be displayed on the 7-segment display (see “3.5 7-segment
display“ on page 149).
The alarm signal function is active in all programs.
4.3.5 Status signals
Depending on the program, various status signals are emitted via the digital outputs. This is done via digital
outputs X4b-K2 and X4c-K3. The relevant program description lists which signals are emitted. If necessary,
DIP switch S22, S23 or S24 can be used to determine which of the two signals in each case is emitted via
an output.
The following status signals exist:
- Compressor signal
The compressor signal is permanently output while the compressor in the outdoor air conditioning unit
is running.
- Operating signal
The operating signal is permanently output while the indoor air conditioning unit is switched on.