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.
Item
Model Available range
(ºC)
Air-cooled
4 ~ 30
cooling only
Cooling 4 ~ 30
Air cooled heat
pump
Heating 35 ~ 60
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, please 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, please change the settings only upon confirmation of the amount of the retained volume of water in the entire
local system.
12
SMGB0082 rev.1 - 07/2015
Water Temp Set ON/OFF Temperature Difference
Setting range
Step (ºC)
0.5
Output Cycle
10~120
(Default: 30)
10
Neutral Zone Range
1~5 (Default: 2)
1
Step (ºC)
(ºC)
0~4
1
Default: 2
Load up I Load up II
Output time Output time
10~120 2~120
(Default: 10) (Default: 2)
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 1
Load up II range
1~3 (Default: 1)
1