EWWQ090G ÷ EWWQ720L - R410A - Water-cooled scroll chillers
EWLQ090G ÷ EWLQ720L - R410A - Condenser less
EWHQ100G ÷ EWHQ400G - R410A - Heat pump scroll chillers
EWAQ-G 075
- R410A - Air-cooled scroll chillers
EWAQ-
- R410A - Air-cooled scroll chillers
EWYQ-
- R410A - Air-cooled scroll heat pumps
Air and Water cooled scroll chillers & heat pump
Operation
Manual
Operation Manual
14
EWWQ - EWLQ - EWHQ
EWAQ - EWYQ
Air or Water cooled scroll chiller &
heat pump
D-EOMHW00107-15EN
Peripheral Bus is used to connect I/O extensions to the main controller.
Controller/
Extension Module
Siemens Part Number
Address
Usage
Main Controller
POL638.00/MCQ
n/a
Used on all configurations
EEXV Module 1
POL94E.00/MCQ
3
Used on all configurations
EEXV Module 2
POL94E.00/MCQ
5
Used when configured for 2 circuits
Option Module
POL965.00/MCQ
18
Used when options required
All boards are supplied from a common 24 Vac sourced directly from the unit. Extension boards
can be directly powered by the Unit Controller. All boards can be also supplied by a 24Vdc source.
These are the limits for the two different power supplies available:
AC: 24V
20% (frequency 45
65Hz)
DC: 24V
10%
Maintain the correct G-G0 polarity when connecting the power supply directly to the extension
boards. The peripheral bus communication will not operate and the boards may be damaged.
2.4 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. To make the connection is required to remove the knockout covers on both UC and
communication module as shown in the following pictures.