Operating Instructions and Installation Instructions

EUWA(*)5~24KBZW1
Packaged air-cooled water chillers
4PW61653-1 – 07.2010
Installation and operation manual
16
Selecting local or remote on/off control
User parameter h07 in combination with the remote on/off switch
(installed by the customer) allows the user to switch the unit on
without using the D or C key on the controller.
■ When user parameter h07 is set to 0 (=not active), the unit can
only be switched on by means of the D and C key on the
controller.
■ When user parameter h07 is set to 1 (=active), the unit can be
switched on or off as follows:
■ When remote on/off switch is opened, then the unit is
switched off and it is not possible to switch the unit on/off
while pressing the D or C key on the controller (5 sec).
■ When remote on/off switch is closed, then the unit is
switched on and it is possible to switch the unit on/off while
pressing the D or C key on the controller (5 sec).
This is a user parameter, refer to "How to consult and modify the user
parameters" on page 15.
Selecting dual setpoint control
User parameters p09 (changeable digital selection S7S) and p34
(changeable digital selection S9S) can be used to assign the dual
setpoint control to S7S or S9S.
There are 2 different controls available for 2 different change digital
inputs (S7S and S9S):
■ p09: changeable digital input selection S7S
■ 0=no function
■ 13=remote dual setpoint
■ p34: changeable digital input selection S9S
■ 0=no function
■ 13=remote dual setpoint
■ 23=remote on/off
When dual setpoint switch is open, the first setpoint is activated (r01
cooling setpoint).
When dual setpoint switch is closed, the second setpoint is activated
(r21 cooling setpoint 2).
This is a user parameter, refer to "How to consult and modify the user
parameters" on page 15.
Locking the controller keyboard
Once user parameter h09 is set to 0, the following advanced
features can no longer be carried out by means of the controller:
■ modifying direct and user parameters (parameters can be
displayed but not modified),
■ resetting the timers.
■ switching the unit on/off in cooling or heating
When user parameter h09 is set to 1, the above-described
advanced features can be carried out using the controller.
To modify user parameter h09 value from 1 to 0, the standard user
parameter modification procedure can be used with the standard
password "22". Refer to "How to consult and modify the user
parameters" on page 15.
To modify user parameter h09 value from 0 to 1, the user
parameter modification procedure can be used with dedicated
password "11". Refer to "How to consult and modify the user
parameters" on page 15.
BMS CONNECTION MODBUS
By installing the optional kit address card EKAC10C, you will be able
to communicate with your chiller through a Building Management
System or supervisory system via the Modbus protocol.
General description of Modbus
The address card communicates using the Modbus protocol.
Different parts of the communication network
■ The communication network consists of two major players:
■ The Building Management System (BMS) or supervisory
system.
■ The chiller or multiple chillers.
■ The BMS or other supervisory system is able to communicate
with the chillers through the address card.
The management of the communication occurs in accordance
with a master-slave structure in polling, where the supervising
BMS is the master and the address cards are the slaves.
■ The chiller unit can be identified by the supervisor through the
assignment of an address within the Modbus network. The
address of the chiller unit can be programmed during the
configuration of the BMS settings.
■ The variables database of every chiller with installed address
card is the point of reference for the supplier of the supervisory
system in Modbus to assign a suitable meaning to the variables.
The variables can be read and/or written by the supervisory
system. Whether the variables are read-only or read/write
depends on the connected chiller and/or the application program
being used.
- If the supervisory system assigns a value to a variable with
read-only status, the command will not be executed at all.
-Variables requested by the supervisory system that are not
available in a chiller with an address card are sent from the
address card to the supervisory system with zero value. The
supervisory system will have to manage these properly.
- In case the supervisory system tries to write a value of a
parameter that is out of range, the writing will be ignored.
NOTE
■ This is only in case p34 (changeable digital input
selection S9S) has value 23 (default value).
■ In case dual setpoint function is selected for this
function (p34=13) then the remote on/off control
is not activated.
4PW61653-1_digital_EN.book Page 16 Thursday, August 26, 2010 1:49 PM