SMC Networks HRS012-A*-10-* User manual

HRX-MM-N007
1st edition: Feb. 2010
Rev.P: Nov. 2015
Service Manual
Thermo-chiller
Air-cooled
refrigerated type
Water-cooled
refrigerated type
HRS012-A  -10- 
HRS012-W  -10- 
HRS018-A  -10- 
HRS018-W  -10- 
HRS012-A  -20- 
HRS012-W  -20- 
HRS018-A  -20- 
HRS018-W  -20- 
HRS024-A  -20- 
HRS024-W  -20- 
HRS030-A  -20- 
HRS030-W  -20- 
Keep this manual available whenever necessary.
© 2015 SMC CORPORATION All Rights Reserved

To users
Thank you for purchasing our Thermo-chiller HRS Series (hereinafter called “This system”).
For safe use of this system and personal safety, be sure to read and understand this manual thoroughly
before performing repair of this system.
Warnings and precautions defined in this manual shall be observed.
This manual provides the explanations of the in-depth remedies for this system. This manual is
intended for service personnel who have completed the service training SMC provides. Only those
who fall under the above condition are allowed to perform maintenance and repair of this system with
the use of the Service Manual.
This product contains a refrigerant circuit inside. Professional skill and exclusive
facility are required for maintenance service and/or repair of the refrigerant circuit.
Maintenance and repair of the refrigerant circuit must be performed by a specialized
operator.
The contents of this manual and related documents supplied with this system shall be neither
regarded as a provision of the contract nor utilized to correct or modify the existing agreements,
commitments and relations.
Copying, duplicating or transferring any part of or whole contents of this manual without the prior
written consent of SMC Corporation is strictly prohibited.
The Operation Manual is supplied in addition to this manual and provides the explanations of the
installation and operation of this system. This manual does not contain the fundamental information
and operating procedures that are provided in the Operation Manual.
Note: The contents of this manual are subject to change without notice.

HRX-MM-N007
Contents
HRS Series
Contents
Chapter 1 Safety Instructions...........................................................1-1
1.1 Before Using Unit.................................................................................................... 1-1
1.2 Reading the Manual ................................................................................................ 1-1
1.3 Hazards.................................................................................................................... 1-2
1.3.1 Level of hazards................................................................................................................... 1-2
1.3.2 Definition of “Serious injury” and “Light injury” ..................................................................... 1-2
1.3.3 Types of hazard labels......................................................................................................... 1-3
1.3.4 Locations of hazard labels ................................................................................................... 1-4
1.4 Other Labels ............................................................................................................ 1-5
1.4.1 Product label ........................................................................................................................ 1-5
1.5 Safety Measures...................................................................................................... 1-5
1.5.1 Safety instructions for use.................................................................................................... 1-5
1.6 Waste Disposal........................................................................................................ 1-6
1.6.1 Disposal of refrigerant and compressor oil .......................................................................... 1-6
1.6.2 Disposal of product .............................................................................................................. 1-6
1.7 Material Safety Data Sheet (MSDS) ........................................................................ 1-6
Chapter 2 Name of Parts...................................................................2-1
2.1 Appearance.............................................................................................................. 2-1
2.2 Component Parts..................................................................................................... 2-3
Chapter 3 Alarm Indication and Troubleshooting...........................3-1
3.1 Alarm Display .......................................................................................................... 3-1
3.2 Error Type and Alarm Set Value ............................................................................. 3-2
3.2.1 How to reset alarm............................................................................................................... 3-4
3.3 Troubleshooting...................................................................................................... 3-5
3.3.1 How to use the flow chart of troubleshooting....................................................................... 3-5
3.3.2 Icons for necessary tools and specifications........................................................................ 3-6
3.3.3 Removal and the mounting of the panel .............................................................................. 3-7
3.3.4 Troubleshooting of alarms.................................................................................................... 3-9
AL01: Low level in tank.................................................................................................................. 3-9
AL02: High circulating fluid discharge temp. [For air-cooled type] ...............................................3-11
AL02: High circulating fluid discharge temp. [For water-cooled type].......................................... 3-20
AL03: Circulating fluid discharge temp. rise ................................................................................ 3-29
AL04: Circulating fluid discharge temp. drop............................................................................... 3-30
AL05: High circulating fluid return temp....................................................................................... 3-32
AL06: High circulating fluid discharge pressure........................................................................... 3-34
AL07: Abnormal pump operation ................................................................................................. 3-37
AL08: Circulating fluid discharge pressure rise ........................................................................... 3-42

HRX-MM-N007
Contents
HRS Series
AL09: Circulating fluid discharge pressure drop ..........................................................................3-45
AL10: High compressor intake temp............................................................................................3-46
AL11: Low compressor intake temp. ............................................................................................3-48
AL12: Low super heat temperature..............................................................................................3-51
AL13: High compressor discharge pressure [For air-cooled type]...............................................3-56
AL13: High compressor discharge pressure [For water-cooled type]..........................................3-64
AL15: Refrigerant circuit pressure (high pressure side) drop ......................................................3-71
AL16: Refrigerant circuit pressure (low pressure side) rise .........................................................3-76
AL17: Refrigerant circuit pressure (low pressure side) drop........................................................3-80
AL18: Compressor overload [For air-cooled type] .......................................................................3-85
AL18: Compressor overload [For water-cooled type]...................................................................3-90
AL19: Communication error .........................................................................................................3-95
AL20: Memory error .....................................................................................................................3-95
AL21: DC line fuse cut..................................................................................................................3-96
AL22: Circulating fluid discharge temp. sensor failure.................................................................3-96
AL23: Circulating fluid return temp. sensor failure.......................................................................3-98
AL24: Compressor intake temp. sensor failure..........................................................................3-100
AL25: Circulating fluid discharge pressure sensor failure..........................................................3-103
AL26: Compressor discharge pressure sensor failure...............................................................3-105
AL27: Compressor intake pressure sensor failure.....................................................................3-107
AL28: Maintenance of pump ......................................................................................................3-109
AL29: Maintenance of fan motor [For air-cooled type]...............................................................3-109
AL30: Maintenance of compressor.............................................................................................3-109
AL31: Contact input1 signal detection........................................................................................3-110
AL32: Contact input 2 signal detection.......................................................................................3-110
AL33: Water leakage.................................................................................................................. 3-111
AL34: Electric resistivity/conductivity rise...................................................................................3-112
AL35: Electric resistivity/conductivity drop .................................................................................3-112
AL36: DI sensor error.................................................................................................................3-113
3.3.5 Troubleshooting of errors without alarm generation.........................................................3-114
The circulating fluid temperature does not go down .................................................................. 3-114
The circulating fluid temperature does not go up.......................................................................3-114
The operation panel displays nothing......................................................................................... 3-114
Impossible to operate the Thermo-Chiller with the "RUN/STOP" key on the operation panel...3-116
Lights on the operation panel or display(s) on the digital display does not operate ..................3-116
The alarm buzzer does not sound..............................................................................................3-117
Facility water does not flow (for water-cooled type)...................................................................3-117
Automatic water fill does not operate (for Option J "Automatic water fill specification")............3-118
Chapter 4 Service Procedure ........................................................... 4-1

HRX-MM-N007
Contents
HRS Series
4.1 Precautions for Whole Work................................................................................... 4-1
4.1.1 Preparation for work............................................................................................................. 4-1
4.1.2 Check after work .................................................................................................................. 4-1
4.2 Work Procedure....................................................................................................... 4-2
4.2.1 Removal and the mounting of the panel .............................................................................. 4-2
4.2.2 Discharge of the circulating fluid and facility water.............................................................. 4-4
4.3 Check After Work .................................................................................................... 4-8
4.3.1 Starting the product.............................................................................................................. 4-8
4.3.2 Stopping the product............................................................................................................ 4-8
4.3.3 Check items after starting .................................................................................................... 4-9
4.4 Icons for Necessary Tools and Specifications.................................................... 4-10
4.5 Replacement Procedure ....................................................................................... 4-12
4.5.1 Replacement of temperature sensor (PT1)........................................................................ 4-12
4.5.2 Replacement of temperature sensor (PT2)........................................................................ 4-14
4.5.3 Replacement of pump (For standard pump)...................................................................... 4-16
4.5.4 Replacement of high pressure pump................................................................................. 4-19
4.5.5 Replacement of mechanical seal set................................................................................. 4-23
4.5.6 Replacement of fan............................................................................................................ 4-27
4.5.7 Replacement of level switch .............................................................................................. 4-30
4.5.8 Replacement of pressure sensor....................................................................................... 4-32
4.5.9 Replacement of dustproof filter.......................................................................................... 4-33
4.5.10 Replacement of front panel................................................................................................ 4-34
4.5.11 Replacement of tank.......................................................................................................... 4-38
4.5.12 Replacement of tank (For automatic water fill) .................................................................. 4-40
4.5.13 Replacement of inlet socket............................................................................................... 4-42
4.5.14 Replacement of power switch............................................................................................ 4-44
4.5.15 Replacement of DC power supply ..................................................................................... 4-46
4.5.16 Replacement of main board & communication board........................................................ 4-48
4.5.17 Replacement of power board............................................................................................. 4-50
4.5.18 Replacement of display board ........................................................................................... 4-52
4.5.19 Replacement of hose......................................................................................................... 4-55
4.5.20 Replacement of fuse.......................................................................................................... 4-61
4.5.21 Replacement of valve for automatic water fill .................................................................... 4-62
Chapter 5 Service Parts List .............................................................5-1
5.1 Before Using Service Parts List ............................................................................. 5-1
5.1.1 Numbering system chart...................................................................................................... 5-1
5.2 Service Parts List .................................................................................................... 5-2
5.3 Illustration of Service Parts .................................................................................... 5-4
5.3.1 Dustproof filter...................................................................................................................... 5-4

HRX-MM-N007
Contents
HRS Series
5.3.2 Panel.....................................................................................................................................5-4
5.3.3 Temperature sensor..............................................................................................................5-5
5.3.4 Hose .....................................................................................................................................5-5
5.3.5 Pressure sensor (For circulating fluid)..................................................................................5-6
5.3.6 Level switch..........................................................................................................................5-6
5.3.7 DC power supply..................................................................................................................5-7
5.3.8 Main board / Communication board / Power board / Display board / Fuse .........................5-8
5.3.9 Power switch ........................................................................................................................5-9
5.3.10 Inlet socket ...........................................................................................................................5-9
5.3.11 Pump ..................................................................................................................................5-10
5.3.12 Fan......................................................................................................................................5-10
5.3.13 Tank....................................................................................................................................5-11
5.3.14 Tank lid ...............................................................................................................................5-11
5.3.15 Valve for automatic water fill...............................................................................................5-12
Chapter 6 Documents ....................................................................... 6-1
6.1 Specifications List ...................................................................................................6-1
6.2 Outline Dimensions .................................................................................................6-4
6.3 Electric Circuit Diagram ..........................................................................................6-6
6.3.1 HRS0--.......................................................................................................................6-6
6.4 Flow chart.................................................................................................................6-7
6.4.1 HRS012-A-, HRS018-A-, HRS024-A-20, HRS030-A-20...........................................6-7
6.4.2 HRS012-W-, HRS018-W-, HRS024-W-20, RS030-W-20 .........................................6-7
Chapter 7 Product Warranty............................................................. 7-1

HRX-MM-N007
Chapter 1 Safety Instructions
HRS Series 1.1 Before Using Unit
1-1
Chapter 1 Safety Instructions
1.1 Before Using Unit
This chapter is intended to specifically describe the safety related issues
for handling the unit.
The unit is a cooling device using recirculating fluid. SMC does not take
any responsibility for any problems that may arise from using the unit for
other purposes.
This product is for the indoor use and not available outdoor.
This product is not designed for a clean room. It generates dust from the
internal components such as pump and fan motor (for air-cooled type).
The unit is operating at high voltage and contains components which
become hot and rotate. If a component needs to be replaced or repaired,
contact a specific vendor for parts and service.
The operate’s, maintence personnel and other people working nearby the
unit should read and understand the safety related descriptions in this
manual carefully before starting work.
Safety manager is responsible to strictly observe safety standards, but
responsibility in respect to safety standard during daily work resides with
each individual operator and personnel for maintainance.
This manual must be kept available to operator’s whenever necessary.
1.2 Reading the Manual
This manual contains symbols to help identify important actions when
installing, operating or maintain the unit.
Read most critical instruction to be considered carefully and ensure
well understanding of the content before operating the unit
This sign stands for actions that must be followed.
This sign stands for prohibited actions.

HRX-MM-N007
Chapter 1 Safety Instructions
1.3 Hazards HRS Series
1-2
1.3 Hazards
1.3.1 Level of hazards
The instructions given in this manual aim to assure safe and correct
operation of the unit and to prevent injury of operators or damage to the unit.
These instructions are grouped into three categories, Danger, Warning and
Caution, which indicate the level of hazard, damage and also the degree of
emergency. All texts that contain safety critical matter and should be
carefully observed.
DANGER, WARNING and CAUTION signs are in order according to
seriousness (DANGER > WARNING > CAUTION).
1.3.2 Definition of “Serious injury” and “Light injury”
“Serious injury”
The injury that gives aftereffects including loss of eyesight, burnt, electrical
shock, fracture, poisoning, etc. and requires long-term treatment or
hospitalization.
“Light injury”
The injury that does not need long term treatment or hospitalization. (Others
excluded from serious injury.)
“WARNING”: Hazard that may cause serious personal injury or death during
operation.
“DANGER”: Hazard that will cause serious personal injury or death during
operation.
“CAUTION”: Hazard that may cause minor personal injury.
“CAUTION without exclamation symbol”: Hazard that may cause damage or failure
of the unit, facility, ect.

HRX-MM-N007
Chapter 1 Safety Instructions
HRS Series 1.3 Hazards
1-3
1.3.3 Types of hazard labels
The unit has various potential hazards and they are marked with warning
labels. Be sure the read this section before starting any work on the unit.
Warning related to electricity
Warning related to high temperatures
Warning related to rotating objects
Warning related to other general dangers
This symbol stands for a possible risk of cutting fingers or hand, or
entanglement by rotating fan (For air-cooled type).
The product contains a cooling fan that rotates during operation of the
product.
The fan can start and stop intermittently and without warning.
DO NOT operate the product without cover panels fitted.
This symbol stands for a possible risk of hot surface and burns.
The product has surfaces that can reach high temperatures during
operation. Even after the power is turned off, there can still be residual
heat in the product.
DO NOT operate the product without cover panels fitted.
DO NOT start working inside the product until the temperature has
decreased sufficiently.
This symbol stands for a possible risk of electric shock.
The product is operated at high voltage and contains uncovered live
terminals inside.
DO NOT operate the product without cover panels fitted.
DO NOT work inside this product unless you have been trained to do
so.
This symbol stands for general danger.
Hazards Inside
Hot Surfaces Inside –See Hot Surface symbol
Rotating Fan Inside –See Rotating Fan symbol (For air-cooled type)
Pressurized Sytem Inside –The product contains pressurised fluid
systems.
DO NOT operate the product without cover panels fitted.

HRX-MM-N007
Chapter 1 Safety Instructions
1.3 Hazards HRS Series
1-4
1.3.4 Locations of hazard labels
There are various warning labels on the product to show the potential
hazards.
Fig.1.3-1 Warning label position
For air-cooled type
Fig.1.3-2 Warning label position
Rear
Front

HRX-MM-N007
Chapter 1 Safety Instructions
HRS Series 1.4 Other Labels
1-5
1.4 Other Labels
1.4.1 Product label
Information about the product, such as Serial No. and Model No. can be
found on the model label. This information is needed when contacting an
SMC sales distributor.
Fig.1.4-1 Position of product label
How to see the manufacturing code RO001 （January 2013）
R
O
001
Year
Symbol
Remarks
Month
Symbol
Remarks
Serial
no.
2013
R
Repeated
from
A to Z in
alphabetical
order
1
O
Repeated from
O to Z in alphabetical
order, with O for
January and Z for
December
－
2014
S
2
P
2015
T
3
Q
↓
↓
↓
↓
1.5 Safety Measures
1.5.1 Safety instructions for use
Read and understand this manual carefully before using the product.
Before starting maintenance of the product, be sure to lock out and tag
out the breaker of the user's power supply.
If operating the product during maintenance, be sure to inform all workers
nearby.
Use only the correct tools and procedure when installing or maintaning
the product.
Use personal protective equipment where specified (“4.4 Icons for
Necessary Tools and Specifications”)
Follow the instructions below when using the product. Failure to
follow the instructions may cause an accident and injury.
Front
Model Number
Serial Number
(SERIAL No.)
The type and quantity of
refrigerant
(REFRIGERANT)
(It is an example of model "HRS018-A-20".)

HRX-MM-N007
Chapter 1 Safety Instructions
1.6 Waste Disposal HRS Series
1-6
Check all parts and screws are fitted correctly and securely after
maintenance.
Avoid working in a drunken or sick condition, which might cause an
accident.
Do not remove the panels except for the cases permitted in this manual.
Do not remove the panels during operation.
1.6 Waste Disposal
1.6.1 Disposal of refrigerant and compressor oil
The product uses hydrofluorocarbon type refrigerant (HFC) and compressor
oil. Comply with the laws and regulations in each country for the disposal of
refrigerant and compressor oil. The type and quantity of refrigerant is
described on the 1.4.1 Product label.
If these fluids need to be recovered, read and understand the instructions
below carefully. If there is any unclear point, contact an SMC's sales
distributor.
1.6.2 Disposal of product
The disposal of the product must be handled by a specialized industrial
waste disposal agency in accordance with local laws and regulations.
1.7 Material Safety Data Sheet (MSDS)
If the material safety data sheets of chemicals used in this product are
needed, contact an SMC's sales distributor.
Any chemicals used by the user must be accompanied by an MSDS.
Only maintenance personnel or qualified people are allowed to open
the cover panels of the product.
Do not mix the compressor oil with domestic waste for disposal. Also,
the disposal of the waste must only be conducted by specific facilities
that are permitted for that purpose.
Comply with the laws and regulations in each country for the disposal
of refrigerant and compressor oil.
The release of refrigerant in to the atmosphere is banned by law.
Recover it with specific equipment and dispose of it correctly.
Only people who have sufficient knowledge and experience about the
product and its accessories are allowed to recover the refrigerant and
compressor oil.

HRX-MM-N007
Chapter 2 Name of Parts
HRS Series 2.1 Appearance
2-1
Chapter 2 Name of Parts
2.1 Appearance
Fig.2.1-1 Name of Parts (HRS012/018/024---)

HRX-MM-N007
Chapter 2 Name of Parts
2.1 Appearance HRS Series
2-2
Circulating fluid
level gauge
Ventilation air inlet
Dustproof filter
Lid for circulating fluid fill port
Operation display panel
(660)[mm ] (26)[in]
(35)[mm ] (1.4)[in]
(500)[mm
]
(19.7)[in]
(21)[mm
]
(0.8)[in]
Power switch
Power cable hole
Drain port
(With plug)
Circulating fluid return port
Rc1/2
Circulating fluid outlet port
Rc1/2
Model no. label
Facility water outlet Rc3/8
(For water-cooled type)
Optuon B
【Earth leakage
breaker】
Drain port
Rc1/4
Option T
【High pressure pump specifications】
Option J
【Automatic water-fill specifications】
Automatic water-fill port Rc3/8
Overflow port Rc3/4
Vent hole
(Same vent hole locates
on the opposite side)
(For air-cooled type)
(377)[mm
]
(14.8)[in]
Facility water inlet Rc3/8
(For water-cooled type)
Ventilation air outlet
Fig.2.1-2 Name of Parts (HRS030--20-)

HRX-MM-N007
Chapter 2 Name of Parts
HRS Series 2.2 Component Parts
2-3
2.2 Component Parts
Fig.2.2-1 Component Parts
Fig.2.2-2 Component Parts
DC24V power supply
Fan
(For air-cooled type)
Pump
Pressure sensor
Communication board
Main board
Power board
Tank lid
Tank
Inlet socket
Power supply switch
Level switch
Temperature sensor
Display board
Temperature sensor
Valve for automatic water-fill
For option J
[With automatic water-fill]
For option T [High pressure pump]
High pressure
pump (100V)
High pressure
pump (200V)

HRX-MM-N007
Chapter 2 Name of Parts
2.2 Component Parts HRS Series
2-4

HRX-MM-N007
Chapter 3 Alarm Indication and Troubleshooting
HRS Series 3.1 Alarm Display
3-1
Chapter 3 Alarm Indication and
Troubleshooting
3.1 Alarm Display
When any alarm occurs, the product responds with the following conditions.
The [ALARM] lamp will flash.
The alarm buzzer sounds.
The alarm no. is displayed on PV.
Contact signal of contact input/output communication is output.
Refer to the Operation Manual for communication for details.
Read alarm status with serial communication.
Refer to the Operation Manual for communication for details.
The thermo-chiller has two types of operation depending on the alarm
status.
One alarm type will stop operation when an alarm is generated during
operation. The other type will not stop operation even when an alarm
is generated.
Only one alarm is displayed on the Thermo-Chiller. When more than
one alarm is being generated, it is possible to check other alarms that
are being generated and not being displayed by pressing the "SEL"
key. When an alarm is being generated, press the "SEL" key to check if
any other alarms are being generated.
Fig.3.1-1 Operation panel
Flash
Alarm
buzzer
[ALARM] lamp
Alarm No.
When the alarm is reset, there is a possibility that the alarm display disappears.
Before resetting the alarm, record details of the alarm.

HRX-MM-N007
Chapter 3 Alarm Indication and Troubleshooting
3.2 Error Type and Alarm Set Value HRS Series
3-2
3.2 Error Type and Alarm Set Value
Table 3-1 Error Type and Alarm Set Value (1/2)
Code
Descriptioin
Operation
Cause / Remedy
(Press the reset key after eliminating the cause.)
AL01
Low level in tank
Stop1
The fluid level has fallen below the level indicator. Fill the
circulating fluid.
AL02
High circulating fluid
discharge temp.
Stop
・Ensure that the circulating fluid flow is 5l/min.or more.
・Reduce the ambient temperature or heat load.
・Wait until the temperature decreases.
AL03
Circulating fluid discharge
temp. rise
Continued1
AL04
Circulating fluid discharge
temp. drop
Continued1
Check the ambient temperature condition and the
temperature of supplied circulating fluid.
AL05
High circulating fluid return
temp.
Stop
・Ensure that the circulating fluid flow is 5l/min.or more.
・Check the heat load are within the specified range.
AL06
High circulating fluid
discharge pressure
Stop
Check the user's piping for bends, squash and foreign
matters.
AL07
Abnormal pump operation
Stop
Restart and check the pump is operating.
AL08
Circulating fluid discharge
pressure rise
Continued1
Check the user's piping for bends, pinching or blockage by
foreign matters.
AL09
Circulating fluid discharge
pressure drop
Continued1
・Restart and check the pump is operating.
・Ensure that the tank level is within the appropriate range.
AL10
High compressor intake
temp.
Stop
Check the temperature of the circulating fluid returning to
the product.
AL11
Low compressor intake
temp.
Stop
・Check the circulating fluid flows.
・Check the circulating fluid in the evaporator is not frozen.
・Use a 15% ethylene glycol aqueous solution if operating
with a set temperature lower than 10oC.
AL12
Low super heat temperature
Stop
AL13
High compressor discharge
pressure
Stop
Reduce the ambient temperature or heat load.
AL15
Refrigerant circuit pressure
(high pressure side) drop
Stop
・Check the ambient temperature is within the specified
range.
・It is possible that refrigerant is leaking. Ask for the
service.
AL16
Refrigerant circuit pressure
(low pressure side) rise
Stop
Reduce the ambient temperature or heat load.
AL17
Refrigerant circuit pressure
(low pressure side) drop
Stop
Check the circulating fluid flows.
AL18
Compressor overload
Stop
Leave for 10 minutes and restart, and check the
compressor is operating.
AL19
Communication error
Continued1
The request message from the host computer has not
arrived. Send it again.
AL20
Memory error
Stop
Written data is different from read data. Ask for the service
of RAM.
AL21
DC line fuse cut
Stop1
DC circuit fuse of the communication connector for the
contact input/output is short circuited.
Ask for the service of the fuse of the DC circuit.
Confirm there is no incorrect wiring or load of 500mA or
larger.
AL22
Circulating fluid discharge
temp. sensor failure
Stop
The temperature sensor is short-circuited or opened.
Ask for the service of the temperature sensor.
AL23
Circulating fluid return temp.
sensor failure
Stop
AL24
Compressor intake temp.
sensor failure
Stop
AL25
Circulating fluid discharge
pressure sensor failure
Stop
The pressure sensor is short-circuited or opened.
Ask for the service of the pressure sensor.
AL26
Compressor discharge
pressure sensor failure
Stop
AL27
Compressor intake pressure
sensor failure
Stop

HRX-MM-N007
Chapter 3 Alarm Indication and Troubleshooting
HRS Series 3.2 Error Type and Alarm Set Value
3-3
Table 3-2 Error Type and Alarm Set Value (2/2)
Code
Descriptioin
Operation
Cause / Remedy
(Press the reset key after eliminating the cause.)
AL28
Maintenance of pump
Continued
The timing of a periodical check is informed.
Recommended to ask for the check and service of the
pump, fan motor and compressor.
AL292
Maintenance of fan motor 2
Continued
AL30
Maintenance of comprssor
Continued
AL31
Contact input1 signal
detection
Stop1
Contact input is detected.
AL32
Contact input 2 signal
detection
AL33
Water leakage
Stop1
・Check if the leakage sensor is connected.
・Leakage occurred. Check the leakage point.
AL34
Electric
resistivity/conductivity rise
Continued
Electrical resistivity/conductivity is larger than the set
value.
If an electric conductivity sensor is used, replace the DI
filter.
AL35
Electric
resistivity/conductivity drop
Continued
Electrical resistivity/conductivity is smaller than the set
value.
If an electric resistivity sensor is used, replace the DI filter.
AL36
Electric
resistivity/conductivity
sensor error
Continued
・Check if the electric resistivity/conductivity sensor is
connected.
・There may be short circuit or open wire of the
resistivity/conductivity sensor. Replace the sensor.
1:’’Stop” or “Continued” are default settings. The user can change them to “Continued” and “Stop”.
2: For air-cooled type.

HRX-MM-N007
Chapter 3 Alarm Indication and Troubleshooting
3.2 Error Type and Alarm Set Value HRS Series
3-4
3.2.1 How to reset alarm
The troubleshooting method depends which alarm has been generated.
Refer to’’ Table 3-1 ’’.
This page explains how to reset the alarm signal condition after eliminating
the cause of the alarm.
1. Ensure that the alarm display screen is displayed.
Alarm can only be reset on this screen.
2. Press [▼] and [▲] keys down simultaneously.
3. The alarm is reset.
The [ALARM] lamp goes off.
The operation panel displays the circulating fluid temperature and the circulating fluid set
temperature.
The contact signal of the contact input/output communication stops.
(Refer to the Operation Manual for communication for details.)
Fig.3.2-1 Alarm reset
OFF
OFF
Press together.
Flash