D-EOMWC00803-26_01EN - 6/39
Figure 1
– Controller Architecture
Controller/Extension Module
Siemens Part Number
Address
Usage
EWWD/H-VZ/DWSC/DWDC
Main Controller
POL688.00/MCQ
n/a
Used on all configurations
Unit Extension Module
POL985.00/MCQ
2
Used on all configurations
Compressor Module 1
POL985.00/MCQ
3
Used on all configurations
Compressor Module 2
POL985.00/MCQ
4
Used on some configurations
HGBP Module 1
POL94U.00/MCQ
5
Optional
HGBP Module 2
POL94U.00/MCQ
6
Optional
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
