Hitachi SAMURAI Series User manual

RCME-(40-60)CLH
Service Manual
SAMURAI SERIES
CONDENSERLESS WATER CHILLERS
-MODULAR-R134a-SCREW TYPE-

Contents
SMGB0097 rev.0 - 07/2015
1. General information
2. Control Functions
3. Servicing
4. Troubleshooting
1. Contents
1
2
3
4
I

SMGB0097 rev.0 - 07/2015
III
General Index
General index
1. General information ..................................................................................................... 1
1.1 General notes..........................................................................................................................................2
1.2 Safety and applied symbols .................................................................................................................... 3
1.3 Product guide ..........................................................................................................................................4
1.3.1 Classication of water chiller models .............................................................................................................. 4
1.3.2 Product guide: Water chillers........................................................................................................................... 4
2. Control Functions......................................................................................................... 5
2.1 Control functions on the module.............................................................................................................. 6
2.1.1 Water control ................................................................................................................................................... 9
2.1.2 Water temperature control............................................................................................................................. 10
2.1.3 Compressor Control ...................................................................................................................................... 13
2.1.4 Control for recovery from power interruption (Option)................................................................................... 15
2.1.5 Prevention of simultaneous startup ............................................................................................................... 16
2.1.6 Reverse prevention control ........................................................................................................................... 16
2.1.7 Anti-Freezing Control for Winter .................................................................................................................... 17
2.1.8 Control for prevention of wrong operation and wrong settings...................................................................... 20
2.1.9 Demand control ............................................................................................................................................. 20
2.1.10 Forced load up capacity control from external signal .................................................................................. 24
2.1.11 2-temperature setting function..................................................................................................................... 25
2.1.12 External thermo operation from external contact ........................................................................................ 26
2.1.13 Water Temperature of the Control Target .................................................................................................... 28
2.1.14 Operation from DC24V contact input .......................................................................................................... 29
2.1.15 Thermo OFF function selection ................................................................................................................... 34
2.1.16 Selection of enabling/disabling of alarm release by means of remote stop ................................................ 35
2.1.17 Limitation setting for pump feedback waiting time....................................................................................... 36
2.1.18 Inlet water temperature thermo OFF function ............................................................................................. 37
2.2 Control of the cooling cycle ................................................................................................................... 39
2.2.1 Compressor Control ...................................................................................................................................... 39
2.2.2 Expansion Valve Control ............................................................................................................................... 40
2.2.3 Overcurrent protection control....................................................................................................................... 42
2.3 Control of Master/Slave group...............................................................................................................43
2.3.1 Summary of control of Master/Slave group ................................................................................................... 43
2.3.2 Setting method .............................................................................................................................................. 43
2.3.3 Operation method.......................................................................................................................................... 44
2.3.4 Other functions of the control of Master/Slave group .................................................................................... 46
2.3.5 Setting items.................................................................................................................................................. 48
2.3.6 Method for setting and conrmation of operation conditions through the LCD screen.................................. 49

SMGB0097 rev.0 - 07/2015
IV
General Index
2.4 Run operation........................................................................................................................................51
2.4.1 Setting of switches on the setting PCB ......................................................................................................... 51
2.4.2 Operation control of the module .................................................................................................................... 52
2.5 Time chart .............................................................................................................................................53
3. Servicing .................................................................................................................... 55
3.1 LCD display for Service Menu............................................................................................................... 57
3.2 General notes........................................................................................................................................65
3.3 Cycle components.................................................................................................................................66
3.3.1 Compressor removal ..................................................................................................................................... 66
3.3.2 Overhaul work ............................................................................................................................................... 68
3.3.3 Recovering the refrigerant ............................................................................................................................ 70
3.3.4 Replacement of the cooler ............................................................................................................................ 70
3.3.5 Replacement of expansion Valve .................................................................................................................. 72
3.3.6 Filter drier ...................................................................................................................................................... 73
3.3.7 Replacement of the check valve ................................................................................................................... 74
3.3.8 Replacement of the stop valve (with check joint) .......................................................................................... 75
3.3.9 Replacement of the high pressure switch (PSH)........................................................................................... 75
3.3.10 Replacement of the pressure sensor (Pd)................................................................................................... 75
3.3.11 Replacement of the pressure sensor (Ps) ................................................................................................... 75
3.3.12 Replacement of the pressure sensor (PS) .................................................................................................. 76
3.3.13 Replacement of the pressure relief valve .................................................................................................... 76
3.3.14 Replacement of the sight glass ................................................................................................................... 76
3.3.15 Replacement of the stop valve (x3)............................................................................................................. 76
3.3.16 Repalacement of the thermistor (Suction, THMs) ....................................................................................... 77
3.3.17 Replacement of the thermistor (Discharge, THMd)..................................................................................... 77
3.3.18 Replacement of the crankcase heater (CH) ................................................................................................ 77
3.3.19 Replacement of the thermistor (Evaporation, THMe).................................................................................. 78
3.3.20 Replacement of the thermistor (Cooler water inlet, THMwi)........................................................................ 78
3.3.21 Thermistor (Cooler water outlet, THMwo2) ................................................................................................. 79
3.3.22 Thermistor (Cooler water outlet, THMwo) ................................................................................................... 79
3.3.23 Replacement of the solenoid valves (SVa, SVb, SVc) ................................................................................ 79
3.4 Electrical components ...........................................................................................................................80
3.4.1 The E-box...................................................................................................................................................... 80
3.4.2 Removal of the LCD screen .......................................................................................................................... 80
3.4.3 Replacement of lamps and push buttons ...................................................................................................... 81
3.4.4 Access to electrical components ................................................................................................................... 81
3.4.5 Removal of the PCB’s ................................................................................................................................... 83
3.4.6 Transformer (TF1) ......................................................................................................................................... 85
3.4.7 Transformers (TF2, TF3, TF4)....................................................................................................................... 85
3.4.8 Overcurrent relay (ORC) ............................................................................................................................... 85

SMGB0097 rev.0 - 07/2015
V
General Index
3.4.9 Contactors (CMC, CMCD, CMCS) ................................................................................................................ 86
3.4.10 Fuses (EF1, EF2, EF3. EFR, EFS, EFT) .................................................................................................... 86
3.4.11 Fuses (PFC) ................................................................................................................................................ 87
3.4.12 Relays ......................................................................................................................................................... 88
3.4.13 Main Switch ................................................................................................................................................. 89
4. Troubleshooting ......................................................................................................... 91
4.1 Inspection of power source and connections ........................................................................................92
4.2 Inspection of PCB..................................................................................................................................93
4.3 Conrmation of operating value of protection devices and automatic operation devices ..................... 93
4.4 Protection control function..................................................................................................................... 94
4.5 Caution indication..................................................................................................................................95
4.6 Summary of fault diagnosis................................................................................................................... 96
4.7 Method for fault diagnosis ..................................................................................................................... 98
4.8 Troubleshooting by alarm code ............................................................................................................. 99
4.9 Analysis and countermeasure of abnormalities...................................................................................123
4.10 Thermistor characteristics ................................................................................................................... 127
4.10.1 Thermistor temperature characteristics (All temperature except discharge gas) ...................................... 127
4.10.2 Thermistor temperature characteristics for discharge gas temperature.................................................... 127
4.11 Pressure sensor characteristics .......................................................................................................... 128
4.11.1 High-pressure sensor ................................................................................................................................ 128
4.11.2 Low-pressure sensor ................................................................................................................................. 128
4.12 Procedures for trouble.........................................................................................................................128

1. General information
SMGB0097 rev.0 - 07/2015
1
1
1. General information
Index
1.1 General notes..........................................................................................................................................2
1.2 Safety and applied symbols .................................................................................................................... 3
1.3 Product guide ..........................................................................................................................................4
1.3.1 Classication of water chiller models .............................................................................................................. 4
1.3.2 Product guide: Water chillers........................................................................................................................... 4

1. General information
General notes
SMGB0097 rev.0 - 07/2015
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1.1 General notes
© Copyright 2014 HITACHI Air Conditioning Products Europe, S.A.U. – All rights reserved.
No part of this publication may be reproduced, copied, led or transmitted in any shape or form without the permission of
HITACHI Air Conditioning Products Europe, S.A.U.
Within the policy of continuous improvement of its products, HITACHI Air Conditioning Products Europe, S.A.U. reserves
the right to make changes at any time without prior notication and without being compelled to introducing them into prod-
ucts subsequently sold. This document may therefore have been subject to amendments during the life of the product.
HITACHI makes every effort to offer correct, up-to-date documentation. Despite this, printing errors cannot be controlled by
HITACHI and are not its responsibility.
As a result, some of the images or data used to illustrate this document may not refer to specic models. No claims will be
accepted based on the data, illustrations and descriptions included in this document.
No type of modication must be made to the equipment without prior, written authorisation from the manufacturer.
HITACHI pursues a policy of continuing improvement in design and performance of products. The right is therefore re-
served to vary specications without notice.
HITACHI cannot anticipate every possible circumstance that might involve a potential hazard.
No part of this document may be reproduced without written permission.
If you have any questions, contact your service contractor of HITACHI.
Check and make sure that the explanations of each part of this Technical Catalogue correspond to your water chiller model.
Refer to the models codication to conrm the main characteristics of your system.
Signal words (DANGER, WARNING and CAUTION) are used to identify levels of hazard seriousness. Denitions for iden-
tifying hazard levels are provided below with their respective signal words.
It is assumed that this unit will be operated and serviced by English speaking people. If this is not the case, the customer
should add safety, caution and operating signs in the native language of the personal.
This water chiller has been designed for the working range described in the corresponding chapter.

1. General information
Safety and applied symbols
SMGB0097 rev.0 - 07/2015
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1
1.2 Safety and applied symbols
During normal system design work or unit installation, greater attention must be paid in certain situations requiring particu-
lar care in order to avoid damage to the unit, the installation or the building or property.
Situations that jeopardise the safety of those in the surrounding area or that put the unit itself at risk will be clearly indicated
in this manual.
To indicate these situations, a series of special symbols will be used to clearly identify these situations.
Pay close attention to these symbols and to the messages following them, as your safety and that of others depends on it.
DANGER
• The text following this symbol contains information and instructions relating directly to your safety and phy-
sical wellbeing.
• Not taking these instructions into account could lead to serious, very serious or even fatal injuries to you and
others in the proximity of the unit.
• Hazards or unsafe practices which could result severe personal injury or death.
In the texts following the danger symbol you can also nd information on safe procedures during unit installation.
CAUTION
• The text following this symbol contains information and instructions relating directly to your safety and physical wellbeing.
• Not taking these instructions into account could lead to minor injuries to you and others in the proximities of the unit.
• Not taking these instructions into account could lead to unit damage.
In the texts following the caution symbol you can also nd information on safe procedures during unit installation.
NOTE
• The text following this symbol contains information or instructions that may be of use or that require a more thorough
explanation.
• Instructions regarding inspections to be made on unit parts or systems may also be included.

1. General information
Product guide
SMGB0097 rev.0 - 07/2015
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1.3 Product guide
1.3.1 Classication of water chiller models
Basic modules
Unit type (Modular water chiller): RCM
E = Made in Europe
Position-separating hyphen (xed)
Capacity (HP): 40, 50, 60
CL = Condenser Less
H = R134a refrigerant
RCM E –XX CL H
1.3.2 Product guide: Water chillers
Basic modules
3N~ 400V 50Hz
Unit Code
RCME-40CLH 8E042340
RCME-50CLH 8E052340
RCME-60CLH 8E062340

2. Control Functions
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2
2. Control Functions
Index
2.1 Control functions on the module.............................................................................................................. 6
2.1.1 Water control ................................................................................................................................................... 9
2.1.2 Water temperature control............................................................................................................................. 10
2.1.3 Compressor Control ...................................................................................................................................... 13
2.1.4 Control for recovery from power interruption (Option)................................................................................... 15
2.1.5 Prevention of simultaneous startup ............................................................................................................... 16
2.1.6 Reverse prevention control ........................................................................................................................... 16
2.1.7 Anti-Freezing Control for Winter .................................................................................................................... 17
2.1.8 Control for prevention of wrong operation and wrong settings...................................................................... 20
2.1.9 Demand control ............................................................................................................................................. 20
2.1.10 Forced load up capacity control from external signal .................................................................................. 23
2.1.11 2-temperature setting function..................................................................................................................... 24
2.1.12 External thermo operation from external contact ........................................................................................ 25
2.1.13 Water Temperature of the Control Target .................................................................................................... 27
2.1.14 Operation from DC24V contact input .......................................................................................................... 28
2.1.15 Thermo OFF function selection ................................................................................................................... 33
2.1.16 Selection of enabling/disabling of alarm release by means of remote stop ................................................ 34
2.1.17 Limitation setting for pump feedback waiting time....................................................................................... 35
2.1.18 Inlet water temperature thermo OFF function ............................................................................................. 36
2.2 Control of the cooling cycle ................................................................................................................... 38
2.2.1 Compressor Control ...................................................................................................................................... 38
2.2.2 Expansion Valve Control ............................................................................................................................... 39
2.2.3 Overcurrent protection control....................................................................................................................... 41
2.3 Control of Master/Slave group...............................................................................................................42
2.3.1 Summary of control of Master/Slave group ................................................................................................... 42
2.3.2 Setting method .............................................................................................................................................. 42
2.3.3 Operation method.......................................................................................................................................... 43
2.3.4 Other functions of the control of Master/Slave group .................................................................................... 45
2.3.5 Setting items.................................................................................................................................................. 47
2.3.6 Method for setting and conrmation of operation conditions through the LCD screen.................................. 48
2.4 Run operation........................................................................................................................................50
2.4.1 Setting of switches on the setting PCB ......................................................................................................... 50
2.4.2 Operation control of the module .................................................................................................................... 51
2.5 Time chart .............................................................................................................................................52

2. Control Functions
Control functions on the module
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2.1 Control functions on the module
List of the main control functions
Item Description
Automatic water
temperature control
1 Slide valve control
The outlet water temperature of the chiller unit is detected with a thermistor, and the stroke of slide valve is
controlled continuously by time-sharing.
Setting Temperature Neutral Zone
Load down area
(Hold)
Load up area
Example of cooling operation: Outlet Water Temperature
Capacity control range: 100~25%, Stop.
2 Thermo ON-OFF control
When operation load becomes light, outlet water temperature falls below the "Stop temperature range" against
the lower limit temperature in neutral zone. By doing so, the compressor stops (Thermo OFF).
The settings of stop temperature range can be changed locally between 0.5 and 2.0ºC (in 0.5ºC steps).
Example of cooling operation:
Lower limit in
neutral zone
Stop temperature range
Outlet water temperature
Thermo OFF
Also, in case that water temperature increases above "Recovery temperature range" against inlet temperature
when Thermo ON is set, the compressor starts (Themo ON). (However, there is a time guard with a minimum
of 3 minutes )
It is possible to change the settings of recovery temperature range, but take into account that the water volume
necessary to maintain the frequency of compressor run/stop will be different.
Compressor Control
Once that "Compressor delay time" has passed after pump startup, compressor starts up with
Υ
-Δ control,
performs startup unload control during 60 seconds, and then shifts to capacity control.
The settings of Compressor delay time can be changed in the range between 30 seconds and 10 minutes (in
30 second steps).
Set a delay time adjusted to the characteristics of the installation, to prevent compressor startup until a
sufcient ow of cold water can be ensured after pump startup. Default: 30 seconds.
Recovery from
momentary power
failure
Compressor is temporarily stopped when a momentary power failure (drop of more than 20% of power source
voltage detected for a period between 13 milliseconds and 2 seconds) occurs, and it is automatically restarted
after time guard time has passed. Also, momentary power failure detection signal is output during 10 seconds
upon detection of momentary power failure.
Automatic recovery
from power
interruption
(Option)
It is possible to restart automatically after recovery from a power interruption (or power source OFF) exceeding
2 seconds.
NOTE
• It returns to the state immediately before the occurrence of power interruption. In case that the unit was
stopped before power interruption, it remains stopped.
• Since this function is optional, it is necessary to make the settings for the enabling of this function at the time
of local installation.
• Since there is the possibility that operation starts abruptly upon power ON, given the circumstances at the
time of power OFF, be careful enough when enabling this function.
Reverse prevention The status of the three phases of power input is monitored, to prevent operation in reverse and open phase.

2. Control Functions
Control functions on the module
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2
Item Description
Anti-freezing for
winter
(Automatic pump
operation)
In order to prevent freezing caused by a decrease of water temperature in winter or under other low ambient
temperature conditions, pump operation order is output automatically.
NOTE
Starting conditions can be selected locally from the 3 types below.
• Water temperature under 15ºC (mainly for systems where the total pump head from the chiller unit to the load
side is supported by a common pump. It protects the entire chiller and load side equipment)
• Water temperature under 5ºC (mainly for systems where the head of chiller unit side and of load side are
supported by separate pumps). It only protects the chiller unit side)
• Disable function: When selecting "Disable function", other freeze prevention measures, such as extraction
of water in winter or winding a heater around the heat exchanger are necessary. Refrigerant may leak if the
water side heat exchanger freezes.
Incorrect operation
prevention
It is not possible to switch between remote and main unit control during operation of the chiller unit. An alarm
is output with respect to such incorrect operation, and to wrong DIP switch settings. Also, an alarm is output to
prevent danger, in case that an operation order is input from a remote when settings are for main unit control.
Demand control
Compressor operation can be limited by external signal input.
Forced thermo OFF: Compressor is stopped forcedly during external signal input.
Current limit function: Operation capacity is limited to make the running current lower than the setting value of
current limit control, during external signal input. Limit value can be changed by local settings.
Forced load-up: Load-up output is conducted forcedly during external signal input.
Capacity hold: Capacity control is ignored forcedly during external signal input.
2 temperature
setting
Cooling operation have 2 setting temperatures each, and it is possible to select which setting temperature is
valid by external signal input. In case of operating with a different extraction temperature, such as heat storage
or air conditioning, it is not necessary to change the setting temperature of the main chiller unit.
Forced load up from
external contact
Forced load up is conducted during outdoor order (non-voltage a contact) input.
It is possible to select whether "the pump shall stop" or "the pump can be kept working" in the event of a thermo
OFF, when thermo OFF judgement at the main unit is enabled.
(This function cannot be used when the function to control the number of units is used )
Information about
overhaul period
Compressor operation time for preventive maintenance is monitored, and when it reaches the overhaul period,
the "Overhaul mark" is shown on the LCD screen.
Disabling of remote
stop alarm clear
(Option)
It is possible to disable the release of alarms by remote stop order input.
NOTE
• Normally, alarms can be released by stop control from either remote or the main unit.
• Since this function is optional, it is necessary to make the settings for the enabling of this function at the time
of local installation.
Limit of waiting time
for pump feedback
(Option)
It is possible to determine pump interlock abnormality and output an alarm in case that no pump feedback
signal is input after a certain amount of time has passed upon startup of the chiller unit.
This time can be changed by local settings, between 1 and 30 minutes (in 1 minute steps).
NOTE
The default feedback waiting time is "unlimited".
Thermo OFF
judgement delay
(Option)
It is possible to delay the judgement time of thermo OFF to avoid immediate thermo OFF when water
temperature reached thermo OFF judgement value due to uctuations in the amount of cold water ow, caused
by momentary variations in load or the activation of valves, etc.
NOTE
• Since this function is optional, it is necessary to make the settings for the enabling of this function at the time
of local installation.
• Thermo OFF is produced when reaching operation limit temperature, even if being in judgement time.

2. Control Functions
Control functions on the module
SMGB0097 rev.0 - 07/2015
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Item Description
Thermo OFF
judgement due to
inlet temperature
It is possible to determine thermo OFF from the inlet water temperature (return temperature from load) of the
chiller unit. It is possible to change the settings of thermo OFF temperature.
NOTE
Since this function is optional, it is necessary to make the settings for the enabling of this function at the time of
local installation.
Preservation of
alarm data
When an alarm occurs, the contents of the alarm, as well as the date and time of occurrence are recorded.
The most recent 10 cases are stored, and then they are deleted from the oldest. Also, for the most recent 3
cases, the data of each sensor (right before occurrence, 10 seconds before and 20 seconds before) as well as
data regarding each setting and operation conditions are stored, and it is possible to check them later on. This
supports the early identication of the causes of alarm occurrence.
Water Temp Set Setting is possible in 0.5ºC units.
Display
Main unit side
LCD device: Displays the status of the chiller unit (Run, stop, contents of alarm, operating pressure and
temperature, etc.)
7-Segment (for backup of the LCD): Displays the status of the unit and content of alarms with individual codes
Pilot lamps: Lit on for power source: white, run: red, alarm: orange
Remote display
Outputs operation of the chiller unit, pump operation, alarm, warning and defrosting
Control of Master/
Slave group
(Module Control)
(Option)
When installing multiple units, operation as one entire heat system is possible by connecting each chiller unit
through H-LINK.
It is possible to connect a maximum of 8 units to one group.
NOTE
• Since this function is optional, it is necessary to make the settings for the enabling of this function at the time
of local installation.
• An exclusive controller is not required, but optional parts may become necessary depending on the structure
of the local system.

2. Control Functions
Control functions on the module
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2
2.1.1 Water control
Outlet water temperature of Chiller Unit is detected by Thermistor, and based on this value, compressor ON/OFF and the
most suitable capacity is determined. Following shown the continuous capacity control and change of water temperature.
9ºC
8ºC
7ºC
6ºC
5ºC
(0.5~5.0ºC)
(0.5~2.0ºC)
(1.0~3.0ºC)
T4
Δ
Tsc:7ºC
T1: 1ºC
T2: 2ºC
T3: 2ºC
T4: 1ºC
Δ
Δ
Δ
Δ
Tsc (setting t.)
T1Δ
T2Δ
T3Δ
Tsc+ T2/3+ T4ΔΔ
Tsc+ T2/3Δ
Tsc- T2/3Δ
Tsc- T2/3- T1ΔΔ
T3Δ
T4Δ
T1Δ
(1.0~4.0ºC)
T2Δ
Outlet
temperature Inlet
temperature
Stop
(Thermo off)
Start
(re-start)
Memorizes the inlet temperature
at Thermo-OFF and re-start at
∆T2
Load up I zone
Load up II zone
Load Down zone
Thermo-off zone
Load up I
status
Load up II
status
Neutral status Load-down status Stop
status
Load up II
status
Neutral
status
Neutral status
Neutral zone
Starting setting
(example)
Method of outlet temperature detection
1 Load-up I control at over 9°C (The capacity is changed a lot in order to approximate the target temp. quickly)
2 Load-up II control at 8~9°C (The capacity is changed moderately)
3 In neutral zone (6~8°C), load is balanced and performance is not changed.
4 Under neutral zone (below 6°C) load-down control is performed and performance is decreased.
5 Stop temp: Compressor is stopped at 5°C. The inlet temp of that time is saved.
6 When inlet temp becomes 2°C higher than that of at stop, re-start signal is output and unit is re-started after at least 3
min guard.

2. Control Functions
Control functions on the module
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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
Water Temp Set ON/OFF Temperature Difference Stop Temperature Range
Available range
(ºC) Step (ºC) Setting range (ºC) Step (ºC) Setting range (ºC) Step (ºC)
Water-cooled
cooling only 4~30 0.5
0~4
Default: 2
1
0.5~2.0
Default: 1.0
0.5
NOTE
• Return temperature range indicates the amount of change in inlet water temperature of the chiller unit to determine
thermo ON after thermo OFF. (Temperature increases).
• 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 conrmation of the amount of the retained volume of water in the entire local
system.
Output Cycle Load up I
Output time
Load up II
Output time
Load down
Output time
Setting range
(Seconds)
10~120
(Default: 30)
10~120
(Default: 10)
2~120
(Default: 2)
2~120
(Default: 2)
Step
(Seconds) 10 1 1 1
Neutral Zone Range Load up II range
Setting range (ºC) 1~5 (Default: 2) 1~3 (Default: 1)
Step (ºC) 1 1
NOTE
• Return temperature range indicates the amount of change in inlet water temperature of the chiller unit to determine
thermo ON after thermo OFF. (Temperature increases).
• 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 conrmation of the amount of the retained volume of water in the entire local
system.

2. Control Functions
Control functions on the module
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2
2 Method to change settings
a. Water temperature settings
The part with the setting temperature
currently enabled is illuminated
INPUT
Select the setting value
with up and down keys
Register with [ENT] key
Cancel with [CAN] key
NOTE
• [Set1]: This is the setting value of the master chiller unit, and water temperature control is normally performed against
this setting value.
• [Set2]: This is the setting value when 2 temperature setting function is enabled (see “2.1.11 2-temperature setting func-
tion”).
• [Ext]: The setting value from an external source is displayed, such as when (a slave unit) following the setting of the
master units, or when connecting to a group controller.

2. Control Functions
Control functions on the module
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b. Setting of other water temperature control settings
Display the input window with [INPUT] key
Input the setting value with up and down
keys
Register the input value and close the
window by pressing the [ENT] key. Also,
by pressing the [CAN] key the input
value is not registered, and the window is
closed.
Continuous control type

2. Control Functions
Control functions on the module
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2
2.1.3 Compressor Control
1 Startup control
The chiller unit receives an operation order, the cool water pump starts up, and after interlock is complete and
compressor delay time (initial setting: 0.5 minutes) has passed, compressor is started up. In continuous control type,
startup takes place in a state in which the slide valve is moved to the smallest load position.
Compressor delay time can be adjusted. change the setting value to one which is adequate for the local facilities, to
avoid compressor startup before ensuring a sufcient cold water ow.
2 Normal
Operation is performed with the smallest load for 1 minute after compressor startup.
After nishing startup control, control is shifted to normal water temperature control.
3 Stop
a. At Themo OFF
Continuous control type stops suddenly. At this time, the compressor sounds as if it was counter-rotating, due to the
pressure differential between high and low pressure.
b. Upon alarm (including retry) · momentary power failure · reception of stop order
Stops suddenly. At this time, the compressor sounds as if it was counter-rotating, due to the pressure differential
between high and low pressure.
Time chart
Operation
order
ON (Chiller reception)
Fullled
Count start Count up
Start up control (1 minute)
Shift to normal control
Delay time setting
Pump
interlock
Compressor
operation
Compressor delay
time count