Water Temperature Control - Hitachi SAMURAI Series Service Manual

2 Control Functions
Control functions on the module

2.1.2 Water temperature control

1 Automatic temperature adjustment
Compressor run/stop and capacity control are performed by detecting water temperature of the chiller unit with
thermistors.
Water Temp Set
Item
Available range
Model
(ºC)
Water-cooled
4~30
cooling only
?
N O T E
• Return temperature range indicates the amount of change in inlet water temperature of the chiller unit to determine thermo ON after
thermo OFF. (In the case of cooling: amount of temperature increase; in the case of heating: amount of temperature decrease)
• It is possible to change settings locally depending on usage purpose, but since the necessary volume of water will change, change the
settings only upon confirmation of the amount of the retained volume of water in the entire local system.
Setting range
(Seconds)
Step
(Seconds)
Setting range (ºC)
Step (ºC)
?
N O T E
• Return temperature range indicates the amount of change in inlet water temperature of the chiller unit to determine thermo ON after
thermo OFF. (In the case of cooling: amount of temperature increase; in the case of heating: amount of temperature decrease).
• It is possible to change settings locally depending on usage purpose, but since the necessary volume of water will change, change the
settings only upon confirmation of the amount of the retained volume of water in the entire local system.
10 SMGB0120 rev.0 - 11/2017
ON/OFF Temperature Difference
Setting range
Step (ºC)
(ºC)
0~4
0.5
Default: 2
Load up I
Output Cycle
Output time
10~120 10~120
(Default: 30) (Default: 10)
10
Neutral Zone Range
1~5 (Default: 2)
1
Step (ºC)
1
Load up II
Output time
2~120
(Default: 2)
1 1
Stop Temperature Range
Setting range
Step (ºC)
(ºC)
0.5~2.0
0.5
Default: 1.0
Load down
Output time
2~120
(Default: 2)
1
Load up II range
1~3 (Default: 1)
1