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Daikin EWWD120MBYN [15/24] Defining dual evaporator pump control
![Daikin EWWD120MBYN [15/24] Defining dual evaporator pump control](/views2/1662029/page15/bgf.png)
EWWD120~540MBYNN
Packaged water-cooled water chillers
4PW22685-1B
Operation manual
14
Defining the thermostat settings
When automatic control mode is selected, the unit uses a thermostat
to control the cooling or heating capacity. However, the thermostat
parameters are not fixed and can be modified via the
screen of the user settings menu.
The default, limit and step values for the thermostat parameters are
shown in "Annex I" on page 21.
Defining the lead-lag mode (only for EWWD360~540)
The lead/lag mode determines which of both circuits starts up first in
case of a capacity demand.
The lead-lag parameters are:
■
Automatic: the controller decides whether circuit 1 or circuit 2
starts up first.
Manual C1>C2: circuit 1 starts up before circuit 2. If circuit 1 is
deactivated due to a failure, circuit 2 will start up instead.
Manual C2>C1: circuit 2 starts up before circuit 1. If circuit 2 is
deactivated due to a failure, circuit 1 will start up instead.
■
: In the automatic mode, the number of hours
indicated on the display is the maximum difference between the
running hours of both circuits. This value is important for main-
tenance purposes. It should be set high enough so that both
circuits do not require maintenance at the same time and that at
least one circuit can remain constantly active.
The lower and upper limits are 100 and 1000 hours respectively.
The default value is 1000 hours.
■
4
: If this parameter is set on
(Yes), both circuits
will try to go up in capacity alternatingly.
If this parameter is set on
(No), the leading circuit will try to go
to full capacity before the lagging circuit can startup.
Defining the capacity limitation settings
In the
screen up to four possible capacity
limitation settings can be configured.
A capacity limitation can be activated:
■
:
•
see "Defining the schedule timer" on
page 14.
•
when a changeable input is configured as
capacity limitation.
•
: to activate capacity limitation 1.
•
: the capacity limitation is not active.
■
#%
: capacity limitation value of circuit 1 in
case of capacity limitation 1/2/3/4.
Defining the pump control settings
The
screen of the user settings menu allows the user
to define the pump-leadtime and pump-lagtime.
■
: used to define the time that the pump must run
before the unit (or the compressor in case
is selected in a DICN configuration) can start up.
■
: used to define the time that the pump keeps
running after the unit (or the compressor in case
is selected in a DICN configuration) has been
stopped.
Defining the schedule timer
To activate the screens of the schedule timer or holiday period, these
first need to be enabled by changing their setting to
in the
appropriate screen. To de-activate the schedule timer or holiday
period, their setting needs to be reset to
. (See "User settings menu"
on page 11.)
The
screen of the user settings menu allows the
user to define the schedule timer settings.
Each day of the week can be appointed to a group. The actions
defined in a group will be executed in each day belonging to that
group.
■
,
,
,
,
,
and
: used to define to which
group each day of the week belongs (
/
/
/
#
/
%
).
■ For each of the four groups up to nine actions can be set, each
with their respective timing. Actions include: putting the unit on
(
), putting the unit off (
), setting a setpoint (
,
,
,
) and setting capacity limitation (
,
,
#
,
%
,
).
■ Beside these four groups there is also a holiday period group
which is set the same way as the other groups. Up to 12 holiday
periods can be entered in the
screen. During these
periods the schedule timer will follow the settings of the holiday
period group.
Defining dual evaporator pump control
The
screen of the user settings menu allows the
user to define the steering of two evaporator pumps (for this to be
possible a changeable digital output has to be configured for a
second evaporator pump in the service menu). Refer to the
installation manual.
■
: used to define which kind of control will be used for the
two evaporator pumps. When automatic rotation is chosen the
offset on running hours also has to be entered.
•
: pump 1 and pump 2 will alternate to the offset on RH.
•
: pump 1 will always start up first.
•
: pump 2 will always start up first.
■
: used to define the offset in running hours
between the two pumps. Used to switch over between pumps
when they work in automatic rotation mode.
Defining the display settings
The
screens of the usersettings menu allows
the user to define the choice of language, time and date.
■
: used to define the language of the displayed
information of the controller (on the first screen). (Push the q
button repeatedly to change the operating language).
■
: used to define the present time (on the second screen).
■
: used to define the present date (on the second screen).
NOTE
■ If changed on one of the units in a DICN
configuration, this setting is transferred to all other
units in the network.
■ A functional diagram showing the thermostat
parameters can be found in "Annex I" on page 21.
NOTE
Refer to “Customization in the service menu”,
chapter “Setting of the changeable digital inputs
and outputs” in the installation manual
NOTE
A functional diagram showing the schedule timer
working can be found in "Annex II" on page 21.
NOTE
The unit always works with “last command”. This means
that the last command given, whether manually by the
user or by the schedule timer, is always executed.
Examples of command that can be given are switching
the unit on/off or changing a setpoint.
NOTE
In case of a DICN network, defining the schedule timer
will only be possible through the master unit. In case of
power failure of the master unit, the slave units
however, will still operate according to settings of the
schedule timer.
Содержание
- Operation manual 1
- Packaged water cooled water chillers 1
- Introduction 2
- Operation manual 2
- Technical specifications 2
- Electrical specifications 3
- Electrical specifications 3
- Gwp global warming potential 3
- Important information regarding the refrigerant used 3
- Periodical inspections for refrigerant leaks may be required depending on european or local legislation please contact your local dealer for more information 3
- Refrigerant type r134a 3
- This product contains fluorinated greenhouse gases covered by the kyoto protocol 3
- Value 1300 3
- Description 4
- Escription 4
- As the refrigerant circulates through the unit changes in its state or condition occur these changes are caused by the following main components 5
- Compressor the compressor m c acts as a pump and circulates the refrigerant in the refrigeration circuit it compresses the refri gerant vapour coming from the evaporator at the pressure at which it can easily be liquefied in the condenser 5
- Condenser the function of the condenser is to change the state of the refrigerant from gaseous to liquid the heat gained by the gas in the evaporator is discharged through the condenser to the ambient air and the vapour condenses to liquid 5
- Evaporator the main function of the evaporator is to take heat from the water that flows through it this is done by turning the liquid refrigerant coming from the condenser into gaseous refrigerant 5
- Expansion valve the liquid refrigerant coming from the condenser enters the evaporator via an expansion valve the expansion valve brings the liquid refrigerant to a pressure at which it can easily be evaporated in the evaporator 5
- Figure 5
- Filter drier the filter installed behind the condenser removes small particles from the refrigerant to prevent blockage of the tubes the drier takes water out of the system 5
- Flowswitch the flowswitch protects the evaporator of the unit against freezing when there is no waterflow or when the waterflow is too low 5
- Function of the main components 5
- Functional diagram 5
- Water in outlet connection the water inlet and outlet connection allow an easy connection of the unit to the water circuit of the air handling unit or industrial equipment 5
- Waterfilter the waterfilter protects the evaporator against clogging 5
- Internal wiring parts table 6
- Safety devices 6
- Before operation 7
- Checks before initial start up 7
- Efore operation 7
- Digital controller 8
- General recommendations 8
- Operation 8
- Peration 8
- Power supply connection and crankcase heating 8
- Water supply 8
- Connection to the unit 9
- How to enter a menu 9
- Setting the language 9
- Switching the unit off 9
- Switching the unit on 9
- Switching units on off in a dicn system 9
- Working with the unit 9
- Consulting actual operational information 10
- Selecting cooling or heating operation 10
- Adjusting the temperature setpoint 11
- Resetting the unit 11
- Advanced features of the digital controller 12
- All menus are directly accessible using the corresponding key on the digital controller the down arrow x on the display indicates that you can go to the next screen of the current menu using the h key the up arrow w on the display indicates that you can go to the previous screen of the current menu using the g key if c is displayed this indicates that you can either return to the previous screen or can go to the next screen 12
- Depending upon the settings in the user settings menu and on the selected cooling heating operation mode the setpoints menu can either be entered directly or by means of the user password 12
- Readout menu 12
- Setpoints menu 12
- The user settings menu protected by the user password allows a full customization of the units 12
- This chapter gives an overview and a brief functional description of the screens provided by the different menus in the following chapter you will find how you can set up and configure the unit using the various menu functions 12
- User settings menu 12
- Additionally the number of safeties that already occured can be consulted on the first line of the history screens 13
- Along with the basic information more detailed information screens can be consulted while the safety menu is active press the q key screens similar to the following will appear 13
- History menu 13
- Info menu 13
- Input output menu 13
- Safeties menu 13
- The history menu contains all the information concerning the latest shutdowns the structure of those menus is identical to the structure of the safeties menu whenever a failure is solved and the operator performs a reset the concerning data from the safeties menu is copied into the history menu 13
- The input output menu gives the status of all the digital inputs and the relay outputs of the unit 13
- The safeties menu provides useful information for trouble shooting purposes the following screens contain basic information 13
- Timers menu 13
- Cooling heating menu 14
- Defining and activating the control mode 14
- Entering the user settings menu 14
- Network menu 14
- User password menu 14
- Defining dual evaporator pump control 15
- Defining the capacity limitation settings 15
- Defining the display settings 15
- Defining the lead lag mode 15
- Defining the pump control settings 15
- Defining the schedule timer 15
- Defining the thermostat settings 15
- Activating or deactivating the setpoints password 16
- Checking the actual value of the software timers 16
- Defining bms control 16
- Defining the network settings 16
- Checking the safety info and the unit status after a reset 17
- Checking the status of the inputs and outputs 17
- Consulting additional unit information 17
- Listing activated safeties and checking the unit status 17
- Changing the user password 18
- Roubleshooting 18
- Troubleshooting 18
- Aintenance 21
- Disposal requirements 21
- Maintenance 21
- Maintenance activities 21
- Cooling inlet water temperature control of evaporator outlet water temperature control of evaporator 22
- Heating inlet water temperature control of condenser 22
- Schedule timer example 22
- Thermostat parameters 22
- Oftware structure 23
- Q q q q q 23
- Q q q q q q 23
- Pw22685 1b 24
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