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Air and Water cooled inverter chillers and heat pump
D-EOMZC00105-17EN
Operation Manual
14/84
EWAD TZ - EWAD TZ B -EWWD VZ
Air and Water cooled inverter chillers and
heat pump
Air pressure min. 260 hPa, corresponding to max. 10,000 m above sea level.
2.4 Controller Architecture
The overall controller architecture is the following:
One MicroTech III main controller
I/O extensions as needed depending on the configuration of the unit
Communications interface(s) as selected
Peripheral Bus is used to connect I/O extensions to the main controller.
Controller/
Extension Module
Siemens Part Number
Address
Usage
EWAD TZ
EWAD TZ B
EWWD-VZ
Main Controller
POL687.70/MCQ
POL687.70/MCQ
POL687.00/MCQ
n/a
Used on all configurations
Extension Module
-
-
POL965.00/MCQ
2
Used on all configurations
EEXV Module 1
POL94U.00/MCQ
POL98U.00/MCQ
POL94U.00/MCQ
3
Used on all configurations
EEXV Module 2
POL94U.00/MCQ
POL98U.00/MCQ
-
4
Used when configured for 2 circuits
Extension Module
-
-
POL965.00/MCQ
4
Used when configured for 2 circuits
EEXV Module 2
-
-
POL94U.00/MCQ
5
Used when configured for 2 circuits
Extension Module
POL965.00/MCQ
-
-
5
Used on all configurations
Rapid Restart Module
POL945.00/MCQ
-
POL945.00/MCQ
22
Used with Rapid Restart option
HFO Module
-
-
POL945.00/MCQ
27
Used with HFO on W/C units
All boards are supplied from a common 24 Vac source. Extension boards can be directly powered by the Unit
Controller. All boards can be also supplied by a 24Vdc source.
CAUTION: Maintain the correct polarity when connecting the power supply to the boards, otherwise the peripheral
bus communication will not operate and the boards may be damaged.
2.5 Communication Modules
Any of the following modules can be connected directly to the left side of the main controller to allow a BAS or
other remote interface to function. Up to three can be connected to the controller at a time. The controller
should automatically detect and configure itself for new modules after booting up. Removing modules from
the unit will require manually changing the configuration.
Module
Siemens Part Number
Usage
BacNet/IP
POL908.00/MCQ
Optional
Lon
POL906.00/MCQ
Optional
Modbus
POL902.00/MCQ
Optional
BACnet/MSTP
POL904.00/MCQ
Optional