Control - Hitachi RCUE40AG1 Installation, Operation And Maintenance Instructions

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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.

2.3. CONTROL

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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.
FEATURES AND BENEFITS
-PART LOAD PERFORMANCE-
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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...
-CONTINUOUS CAPACITY CONTROL-
Start
Outlet Water Temperature
-CONVENTIONAL STEP CONTROL-
Outlet
Temperature
Final step
Continuous
Capacity
Control
COOLING CAPACITY (%)
Load Up 1
(Quick cooling)
Load Up 2
Neutral =2°C Standard
(Minimum 0.5°C)
Load Down
Restart
1st step
2
/3
TIME
Temperature
Band 7°C
(normally)