Daikin EWWD440AAYNNO series, Инструкция по установке и эксплуатации, Страница: 23 / 40

EWWD440~850AAYNNO**
Packaged water-cooled water chillers
4PW25558-1B Installation and operation manual
21
By remote signal
Several operational conditions can be followed remotely in case of
appropriate bridge wiring connections.
■
Unit is running or is stopped.
■
Signal for unit error and for individual compressor error
■
Selected operation mode (for models with the 2-temperature
setting option only)
Consulting operational data
Various operation data of the unit can be read on the graphic
panel display.
["MENU"
➞
"MEASUREMENT"]
1 Select "MEASUREMENT" from the "MENU" screen.
F
UNCTIONS OF THIS MODEL
Automatic water temperature control
This unit has a function that performs automatic control by bringing
the chilled water to the target temperature.
The capacity control mechanism inside the compressor (slide valve)
stabilizes the chilled water outlet temperature in function of variations
in cooling load.
Set the target temperature on the graphic panel display.
["MENU"
➞
"SETTING"
➞
"SETTING (1/2)”]
See "Target temperature and low load stop related settings screen"
on page 22 .
Figure: Chilled water outlet temperature diagram in case of load
variation.
Low load stop (Thermo off)
When the cooling load decreases beyond the capacity control range
of the unit, the chilled water outlet temperature continues to decrease
gradually in function of the target temperature.
This unit has a function that allows the compressor to suspend its
operation automatically when the chiller water outlet temperature has
lowered beyond a certain limit. When the chiller water temperature
rises, the operation of the compressor restarts. (Restart is not
available when ON-OFF limiting time of the compressor is activated.)
Lamp name Color Lighting condition Remarks
Power ON/OFF White When the unit is powered-up
Standard
Error Red In case of error
Chiller ON Green
When the unit accepts the
operation request
Compressor 1
ON
Green
When the left compressor
viewed from the front
operates
Compressor 2
ON
Green
When the right compressor
viewed from the front
operates
Chiller OFF Red
When the unit stops
(Exclusive of thermo OFF)
Remote
operation
Green
When the remote Run/Stop
operation is selected
■
Output contact specification of voltage-free contacts
are all normal open contacts.
■
Contact capacity shall be 10 mA to 3 A per contact.
NOTE
■
The next screen is for standard models with
chilled water specification.
■
In case of models with heat recovery
specification, indication of hot water
temperature appears (Inlet/Outlet).
■
The items in the figure with “1” at the end of the
left column is data for the left compressor.
■
The items in the figure with “2” at the end of the
left column is data for the right compressor.
1 Target temperature (to be set on the touch panel)
2 Chilled water outlet temperature
3 Plus side dead zone
4 Negative side dead zone
2
3
4
(0.5
°
C)
(0.5
°
C)
open command
close command
stop
Compressor capacity
control oper
ation
Target temperature (1)