FEATURES AND BENEFITS
2
/3
"
Energy Saving
Thanks to Continuous Capacity Control, 15~20% energy
saving is possible compared with current step control
systems due to the following:
!
The cooling load can be more closely matched
!
Continuous Capacity Control takes advantage of high
efficiency part load performance.
!
Frequent compressor starts and stops are eliminated.
-PART LOAD PERFORMANCE-
2.3.
CONTROL
"
Many Functions
Newly developed Control Board has many functions shown
below as standard.
!
REMOTE/LOCAL changeover switch
!
Individual Alarm
!
Pump operation circuit
!
Pump Freeze Protection Control
!
Reverse Phase Protection
!
Time Guard
!
Star Delta starting Circuit
!
Easy Interface
etc...
"
Precise Temperature Control
Combination of "Continuous Capacity Control
Compressor" and "HITACHI´s unique
electronic controls" enable the Chiller to
control outlet water temperature precisely,
independent of cooling load.
This control benefits not only air-conditioning
but also industrial process use.
-CONTINUOUS CAPACITY CONTROL-
-CONVENTIONAL STEP CONTROL-
MO
TO
R INPUT (%)
COOLING CAPACITY (%)
Continuous
Capacity
Control
Start
Outlet Water Temperature
Load Up 2
Load Up 1
(Quick cooling)
Neutral =2
°
C Standard
(Minimum 0.5
°
C)
Load Down
TIME
WATER TEM
PERATURE
WATER TEM
PERATURE
Restart
1st step
Final step
Outlet
Temperature
Temperature
Band 7
°
C
(normally)
