Daikin LX10F11B User manual

TR13-07
(2014.01.00000)NK
HeadOffice.UmedaCenterBldg.,4-12,Nakazaki-Nishi2-chome,Kita-ku,Osaka,530-8323Japan.
Tel:06-6373-4338
Fax:06-6373-7297
TokyoOffice.JRShinagawaEastBldg.,11F18-1,Konan2-chome,Minato-kuTokyo,108-0075Japan.
Tel:03-6716-0420
Fax:03-6716-0230
DAIKININVERTERCONTAINERREFRIGERATIONUNITServiceManual
TR 13-07
ServiceManual
DAIKININVERTER
CONTAINER
REFRIGERATIONUNIT
LX10F11B or later
（DECOS Va）
LX10F11B or later
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Revision A Correction of spelling 2012.9.28
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1
Make sure to read these instructions before operation.
This manual provides the minimum information required to operate the
container refrigeration unit LX10F※※B or later including the part names
of each operating section, how to turn the power on and how to change
the temperature setting, as well as the functions of the product and
maintenance work, etc.
In addition, refer to the following document have been issued.
・Parts list
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2
Contents
SAFETY PRECAUTIONS
DANGER ………………………………………………3
WARNING………………………………………………3
CAUTION ………………………………………………3
Chapter 1 Unit Specifications…………………… 1-1
1.1 Main Specifications …………………………… 1-2
1.2 Set Point and Protection Device ……………… 1-3
1.3 Construction …………………………………… 1-4
1.3.1 Outside View ……………………………… 1-4
1.3.2 Inside View ………………………………… 1-5
1.3.3 Control Box ………………………………… 1-6
1.3.4 CPU Board and I/O Board ……………… 1-7
1.3.5 Inverter Box ……………………………… 1-8
1.3.6 Valves and Functions …………………… 1-9
1.3.7 Sensor Location…………………………… 1-9
1.3.8 Printed Circuit Board…………………… 1-10
1.4 Operation Mode and Control ……………… 1-11
1.4.1 Frozen Mode …………………………… 1-11
1.4.2 Chilled Mode …………………………… 1-12
1.4.3 Dehumidification Mode (Option) ……… 1-13
1.4.4 Defrost Mode …………………………… 1-14
1.4.5
Compressor, Fan Motor, Valve Function …1-15
1.4.6 Common Control ……………………… 1-16
1.5 Optional Functions ………………………… 1-17
1.5.1 ASC, Automatic Setpoint Change …… 1-17
1.5.2 Cold Treatment Transport …………… 1-18
1.5.3 ACT, Automatic Cold Treatment ……… 1-18
1.5.4
Ventilator Volume Detection (FA Sensor) …1-19
1.5.5 Remote Monitoring Receptacle ……… 1-19
1.6 Battery Mode ………………………………… 1-19
1.7 Information Interchange with Personal Computer …1-20
Chapter 2 Controller ……………………………… 2-1
2.1 Operation Panel………………………………… 2-2
2.2 Controller Functions List ……………………… 2-3
2.3 Operation Procedure ………………………… 2-4
2.4 Wake-up Battery (Rechargeable Battery) …2-18
2.5 Alarm Code ………………………………… 2-19
2.6 Alarm Diagnosis …………………………… 2-22
2.7 General Diagnosis…………………………… 2-45
Chapter 3 PTI & Periodic Inspection…………… 3-1
3.1 Pre-Trip Inspection …………………………… 3-2
3.2 Manual Inspection……………………………… 3-3
3.3 Automatic PTI ………………………………… 3-5
3.3.1 Automatic PTI Step No. and Contents …3-6
3.3.2 Automatic PTI Alarm ……………………… 3-6
3.4 Periodic Inspection …………………………… 3-8
Chapter 4 Service ………………………………… 4-1
4.1 Manual Check ………………………………… 4-2
4.2 Automatic Pumpdown ………………………… 4-6
4.3 Connecting and Removing Manifold gauges …4-7
4.4 Checking Non-Condensable Gas …………… 4-8
4.5 Sight Glass……………………………………… 4-8
4.6 Refrigerant Recovery and Charge …………… 4-9
4.6.1 Operation Pressure Check …………… 4-10
4.6.2 Refrigerant Recovery ………………… 4-10
4.6.3 Vacuum and Dehydration ……………… 4-10
4.6.4 Refrigerant Charge …………………… 4-11
4.7 Electrical Circuit and Servicing Precautions …4-12
4.8 Parts Replacement ………………………… 4-13
4.8.1 Compressor …………………………… 4-13
4.8.2 Evaporator Fan and Fan Motor Removing …4-15
4.8.3 Inverter Board (EC8) …………………… 4-16
4.8.4 CPU Board (EC1) ……………………… 4-16
4.8.5 I/O Board (EC2) ………………………… 4-17
4.8.6 Operation Board (EC3)………………… 4-17
4.8.7 PT/CT Board (EC7) …………………… 4-17
4.8.8 High Pressure Switch (HPS) ………… 4-18
4.8.9 High Pressure Sensor (HPT) ………… 4-18
4.8.10 Low Pressure Sensor (LPT) ………… 4-19
4.8.11 Electronic Expansion Valve (EEV), Economizer Modulation
Valve (EMV), Discharge Modulation Valve (DMV) …4-20
4.8.12 Solenoid Valve ………………………… 4-21
4.8.13 Dryer …………………………………… 4-21
4.8.14 Fusible Plug …………………………… 4-21
4.8.15 Check Valve …………………………… 4-22
4.8.16 Filter and Strainer …………………… 4-22
4.9
Emergency Operation at Controller Malfunction …4-23
4.9.1 Wiring Change of Controller…………… 4-23
4.9.2 Fixing of EEV Opening ………………… 4-24
4.9.3 Fixing of EMV Opening………………… 4-24
4.9.4 Fixing of DMV Opening………………… 4-25
Chapter 5 APPENDIX …………………………… 5-1
5.1 Standard Tightening Torque for Bolt and Flare Nut …5-2
5.2 Temperature Sensor Characteristics ………… 5-3
● SS/RS/DSS/DRS/EIS/EOS/Eco In/Eco Out/SGS/AMBS …5-3
● DCHS Sensor Characteristics DCHS1/DCHS2 …5-4
●NTC type USDA Sensor Characteristics,
USDA1, USDA2, USDA3, CTS (Option) …… 5-5
●ST9702-1 type USDA Sensor Characteristics,
USDA1, USDA2, USDA3, CTS (Option) …… 5-6
5.3 Pressure Sensor Characteristics …………… 5-7
5.4 Humidity Sensor Characteristics, HuS (Option) …5-7
5.5 R134a Characteristics ………………………… 5-8
5.6 Sequence ……………………………………… 5-9
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3
SAFETY
PRECAUTIONS
Always observe the following points
before operating or inspecting a unit
DANGER
Always shut off the main power supply
of the facility before disconnecting the
power plug.
Always turn off the main power supply of
the facility before inspecting the interior
of the control box.
To inspect inside the inverter box,
ensure to follow the instructions below.
1) Ensure to leave the unit at least 10 minutes
after turning off the circuit breaker before
opening the cover of the inverter box.
*This is because it takes time for the charge
accumulated in the capacitor on the inverter board
to be released.
2) Open the inverter box cover and ensure that
the voltage between the terminal TP1 and TP2
on the inverter board is less than DC50V before
starting inspection.
R134a should be used as refrigerant.
Be sure to prevent air from becoming mixed in with
refrigerant, and never charge the equipment used for
hydrostatic pressure tests with gas that contains air
or O2.
If any other refrigerant not specified is charged, or
charging procedure is not correct, it may explosions
may occur.
WARNING
Do not touch the condenser fan while
power to the unit is ON.
Before removing the condenser fan cover, turn off
the circuit breaker and disconnect the power plug.
During air-cooled operation : Condenser fan may
start and stop automatically for the refrigerant high
pressure control.
CLASS 1 PRODUCT SPECIFIED BY THE LAW
CONCERNING THE RECOVERY AND
DESTRUCTION OF FLUOROCARBONS
HFC IS USED FOR THIS PRODUCT AS A
REFRIGERANT.
(1) Emission of fluorocarbons into the atmosphere
without permission is prohibited.
(2) Recovery of fluorocarbons is mandatory when
scrapping and servicing this product.
(3) The kind of fluorocarbon and its amount are
stated in the manufacturer's label.
CAUTION
Wash the refrigeration unit with fresh water at PTI.
1. Carefully flush the external condenser with fresh
water to remove the salt that sticks to it.
2. Corrosive gases generated from the cargo may
corrode the copper pipes and aluminum fin of the
internal evaporator. Therefore, wrap up the cargo
properly to prevent such corrosion.
Major corrosive gases include chlorine, ammonia,
sulfuric acid, acetic acid, sulfur dioxide etc.
Securely close the control box cover.
Otherwise, it will allow water entry.
Use only Daikin specified refrigerant oil
(IDEMITSU, Daphne Hermetic Oil FVC68D).
Open the oil can, just before charging the oil.
Do not leave the can open for a long time to
avoid moisture entry.
Using refrigerant oil which has absorbed moisture
may cause problems with the unit.
Do not release refrigerant R134a into
atmosphere. Use recovery machine according to
present regulation.
Important information
regarding the refrigerant
This product contains greenhouse gases
covered by Kyoto Protocol.
Do not discharge refrigerant into atmosphere.
Refrigerant type : R134a
GWP (1) value : 1430
(1) GWP=global warming potential
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1-1
Chapter 1 Unit Specifications
1.1 Main Specifications
1.2 Set Point and Protection Device
1.3 Construction
1.3.1 Outside View
1.3.2 Inside View
1.3.3 Control Box
1.3.4 CPU Board and I/O Board
1.3.5 Inverter Box
1.3.6 Valves and Functions
1.3.7 Sensor Location
1.3.8 Printed Circuit Board
1.4 Operation Mode and Control
1.4.1 Frozen Mode
1.4.2 Chilled Mode
1.4.3 Dehumidification Mode (Option)
1.4.4 Defrost Mode
1.4.5 Compressor, Fan Motor, Valve Function
1.4.6 Common Control
1.5 Optional Functions
1.5.1 ASC, Automatic Setpoint Change
1.5.2 Cold Treatment Transport
1.5.3 ACT, Automatic Cold Treatment
1.5.4 Ventilator Volume Detection (FA Sensor)
1.5.5 Remote Monitoring Receptacle
1.6 Battery Mode
1.7 Information Interchange with Personal Computer
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1-2
1.1 Main Specifications
Item Main Specifications
Mode Switch Chilled mode +30.0℃〜-9.9℃(+86.0F 〜-14.1F)
Frozen mode -10.0℃〜-30.0℃(+14.0F 〜-22.0F)
Condenser cooling system Air cooling type
Controller DECOSVa
Power source Three phase 50Hz : 380/400/415V、60Hz : 440/460V
Voltage fluctuation rate should be within ±10%.
Inverter compressor Hermetically sealed scroll type (MAX. motor output : 8.1 kW)
Evaporator Cross-fin coil type
Air cooling condenser Cross-fin coil type
Evaporator fan Propeller fan
Evaporator fan motor Squirrel-cage three phase induction motor (Motor output:
400W/60W), dual speed, 2P/4P
Condenser fan Propeller fan
Condenser fan motor Squirrel-cage three phase induction motor (Motor output:
670W/120W), dual speed, 4P/6P
Defrosting system Hot-gas defrosting system
Refrigerant control Electronic expansion valve
Capacity control By inverter compressor and hot-gas control
Refrigerant R134a (For refrigerant charging amount, refer to the name plate)
Refrigerant oil IDEMITSU, Daphne hermetic oil FVC68D
Weight For detail, refer to the name plate, unit performance
●The resistance of solenoid coil
Component name Coil Resistance
Compressor motor 0.90Ω±7% (20℃)
Condenser fan motor High speed: 30.6Ω±5% (20℃) / Low speed: 21.6Ω±5% (20℃)
Evaporator fan motor High speed: 23.0Ω±10% (20℃) / Low speed: 89.2Ω±10% (20℃)
Solenoid valve LSV, ESV, HSV, RSV 15.2 Ω±10% (20℃)
Modulation valve EEV, EMV, DMV 46±3Ω/phase（20℃）
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1-3
1.2 Set Point and Protection Device
Component Name Detector Symbol Setting Value Alarm
High pressure switch HPS OFF≧2400kPa（24.47kg/cm2）
ON≦1900kPa（19.37kg/cm2）
E101
F101
Pressure relief valve PRV Open≧2450kPa（25.0kg/cm2）−
Fusible plug −95〜100℃（203〜212℉） −
Built-in thermal protector
for condenser fan motor Q1M OFF≧135℃±5℃（275℉±41℉） ON≦86℃±15℃（187℉±59℉）
−
Built-in thermal protector
for evaporator fan motor −OFF≧145℃±5℃（293℉±41℉）
ON≦94℃±15℃（201℉±59℉）
−
Circuit breaker (ELCB) CB 30A（100mA）−
●Fuse and Protection Circuit
Board Fuse Type Protection Circuit Alarm
I/O board
（EC2）
F1U
F10A 250V
fast-acting type
I/O board control power（DC13.5V, 5V, 3.3V） −
F2U PCC1, PCC2, CFH, CFL, EFH, EFL
HSV, RSV, LSV, ESV
F703
F707
E115
E117
F3U Spare −
PT/CT
board
（EC7）
F11U 8A 600V PT/CT board control power −
Noise filter
board
（EC9）
F5U
12.5A 300A
Surge absorber 1 (lightning surge protection)
<Non-replaceable> −
F6U Surge absorber 2 (lightning surge protection)
<Non-replaceable> −
F7U Surge absorber 3 (lightning surge protection)
<Non-replaceable> −
F8U 8A 600V Inverter control circuit <Non-replaceable> −
I/O board
（EC2）
TH3 2.5A 72V
Automatic reset
RM (Remote Monitoring) circuit
<Non-replaceable> −
TH2 TransFresh circuit <Non-replaceable> −
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1-4
【Sensor】
AMBS ： Ambient Temperature Sensor
DCHS1： Discharge Gas
Temperature Sensor 1
DCHS2： Discharge Gas
Temperature Sensor 2
ECO IN：Economizer Inlet
Temperature Sensor
ECO OUT ：Economizer Outlet
Temperature Sensor
HPS ：High Pressure Switch
HPT ： High Pressure Transducer
LPT ：Low Pressure
Transducer
SGS ：
Compressor Suction Gas
Temperature Sensor
【Valve】
DMV ： Discharge Modulation Valve
EEV ： Electronic Expansion Valve
EMV ： Economizer Modulation Valve
ESV ： Economizer Solenoid Valve
HSV ： Hot Gas Solenoid Valve
LSV ：Liquid Solenoid Valve
RSV ：Reheat Solenoid Valve
PRV ：Pressure Relief Valve
【Service port】
①Low Pressure (Gas line)
②High Pressure (Gas line)
③High Pressure (Liquid line)
④High Pressure (Liquid line)
1.3 Construction
1.3.1 Outside View
Ventilator
Storage space for power cable
Dryer
PRV
HSV RSV DMV Economizer
EEV
EMV
③
LPT AMBS
①
②
④
SGS
DCHS1
HPS
HPT
Inverter compressor
RPP1 (PC port receptacle)
RM (Remote monitoring receptacle)
ESV
LSV
Sight
glass
Receiver
Display panel
& key pad
Condenser
fan
Access
panel
Compressor
cover
Model name plate
Inverter box
Compressor chamber
Valve chamber
Contents on unit name plate
Model name
MFG.NO. (Manufacturing number)
MONTH/YEAR
R134a charge amount [kg]a
Unit weight [kg]
ECO OUT
ECO IN
DCHS2
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1-5
1.3.2 Inside View
【Sensor】
CTR ：Cargo Temperature Sensor Receptacle
(Option)
DRS ：Return Air Temperature Sensor for Data
Recorder (Option)
DSS ：Supply Air Temperature Sensor for Data
Recorder
EIS ：Evaporator Inlet Temperature Sensor
EOS ：Evaporator Outlet Temperature Sensor
HuS ：Humidity Sensor (Option)
RPP2 ：PC Port Receptacle（Option）
RS ：Return Air Temperature Sensor
SS ：Supply Air Temperature Sensor
USDA1：USDA Sensor 1 Receptacle（Option）
USDA2：USDA Sensor 2 Receptacle（Option）
USDA3：USDA Sensor 3 Receptacle（Option）
RS, DRS (Option)
Evaporator
fan
EIS
EOS
SS, DSS
HuS (Option) Evaporator
Reheat coil
(Option)
USDA1
USDA2
USDA3
CTR
RPP2
(Option)
〈TOP OF VIEW〉
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1-6
1.3.3 Control Box
BAT ：Wake-up Battery (Rechargeable Battery)
CB ：Circuit Breaker (ELCB)
CFH ：Magnetic Contactor, CFM high speed
CFL ：Magnetic Contactor, CFM low speed
EFH ：Magnetic Contactor, EFM high speed
EFL ：Magnetic Contactor, EFM low speed
PCC1 ：Phase Correction Contactor 1
PCC2 ：Phase Correction Contactor 2
PT/CT ：PT/CT Board
RCD ：Modem (Option)
Tr1 ：Transformer for Operating Circuit
LCD board (EC4) Sheet key (EC6)
Operation Panel Operation board
(EC3)
PCC2
EFH EFL CFH CFL CPU board (EC1) I/O board (EC2)
PCC1
CB
Tr1
(Behind of CB)
Earth
terminal block
PT/CT (EC7)
BATRCD (option)
installation position
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1-7
1.3.4 CPU Board and I/O Board
I/O board（EC2）
CPU board（EC1）
PT/CT
X4A
ACS
X19A
LPT
HPT
X7A
USDA1
USDA2
USDA3
CTS
X6A
option
X14A
BATTERY
X2A
EMV
X10A
PC2
X18A
EEV
X9A
DMV
X11A
I/O
X1A X20A X16A
PC1
FAS
ECO IN
ECO OUT
DCHS2
HuS
DRS
EIS
EOS
RS
DSS
SS
SGS
AMBS
DCHS1
X8A
MODEM
X12A
Operation
board
X3A
Short circuit connectors for
emergency operation
X30A
Tr1
X21A X25A
WPS
X26A
RM
X22A
HSV
RSV
SV1
PCC1
PCC2
CFH
CFL
EFH
EFL
CBS
X28A
option
X27A
X24A
CPU
X23A
X33A
INV
LSV
ESV
SV2
MODEM
F1U
F10A/250V
Spare
F10A/250V
F3U
X31A
X32A
PCC1 PCC2
EMERGENCY
LED output indicator
PCC1
PCC2
CFH
CFL
EFH
EFL
HSV
RSV
LSV
ESV
SV1
SV2
RM
T/F
[HEAT]RED [COOL]BLUE
F2U
F10A/250V
LED lampUSB memory port
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1-8
1.3.5 Inverter Box
X6A
X801A
X4A
X802A
U
V
W
L1B
L2B
L3B
L3B
L2BL1B
L1B-2
L3AL2AL1A
12.5A AC300V 12.5A AC300V 12.5A AC300V
8A AC600V
F5U
F6U F7U
F8U
X91A
Noise filter board（EC9）
Noise filter board（EC9）
Inverter board（EC8）
AC reactor
Inverter board（EC8）
TP1 TP2
P2
P1
Note: Wiring diagram for the unit including inverter circuit is put on back side of the control box cover.
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1-9
Sensor mounted in outside
Sensor mounted in inside
RS/DRS
SS/DSS
AMBS
EIS
DCHS2
SGS
HuS
DCHS1
Valve chamber
Economizer
Reheat coil (option)
Condenser
Receiver
Compressor
HPT
HPS
EMV
ESV
LSV Dryer
EEV
LPT
Evaporator
CFM
EFM
RSVHSV PRV
DMV
EOS
Sight glass
ECO OUT
ECO IN
1.3.7 Sensor Location
1.3.6 Valves and Functions
EEV: Electronic Expansion Valve
EEV controls super heat at the evaporator outlet
and controls the refrigerant supply amount
to the evaporator by means of temperature
sensors installed at the evaporator outlet and
inlet.
DMV: Discharge Modulation Valve
DMV is usually used at fully-open. However,
while in defrosting operation, the opening is
adjusted as release control.
EMV: Economizer Modulation Valve
EMV controls the refrigerant supply amount to
the economizer while in pull-down operation
by adjusting EMV opening by means of
the temperature sensors mounted at the
economizer outlet and inlet. EMV is also used
for the discharge pipe temperature control and
charging control during defrost and heating
operation.
ESV: Economizer Solenoid Valve
Opening of ESV is synchronized with EMV.
LSV: Liquid Solenoid Valve
LSV is opened while in compressor operation. It
is closed while in defrost and heating operation
and automatic pump-down.
HSV: Hot gas Solenoid Valve
HSV is opened while in defrost and heating
operation to supply hot-gas from the
compressor to the evaporator and drain pan.
It is also opened to equalize the pressure to
protect compressor in case of large pressure
difference of high and low pressure while in
compressor start up.
RSV: Reheat Solenoid Valve
RSV is opened while dehumidification
control operation to supply hot-gas from the
compressor to the reheat coil.
PRV: Pressure Relief Valve
PRV is mechanical type pressure release valve.
It releases the refrigerant to the low pressure
side when the pressure rises abnormally during
non operation.
Valve chamber
EMV
ESV
LSV
EEV
CFM
RSV
HSV
PRV
DMV
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1-10
1.3.8 Printed Circuit Board
●CPU Board（EC1）
Controller described in this manual as CPU board.
CPU board equips micro-computer and controls
unit with operation software installed.
All information required for the control is input to
the CPU board.
①Sensor information (temperature, humidity,
pressure) and power information (voltage, phase
sequence, current) are input.
②Configuration items (factory set) in accordance
with requirement for individual user's order are
input.
③For example Unit ON/OFF, SP change, etc are
inputted by key operation.
In responding to these inputs, CPU board outputs
commands to each part to operate unit with
accuracy.
①to modulation valves, solenoid valves and
magnetic contactors
②to inverter board
③to LCD display
Operation data is stored for 2 years（Logging
interval 60 minutes). The data can be downloaded
using a PC which has the DCCS software installed
or with a USB memory.
When power OFF, some of setting work and data
indication can be available by wake-up battery
power (Rechargeable battery). Data download and
software upload are also possible. (Refer battery
mode in paragraph 2.3)
Use Daikin spare parts for CPU board replacement.
After replacement, configuration items are
transmitted from operation board. Set controller
time in accordance with setting request displayed
on LCD. Install the latest operation software down-
loaded from web site.
●I/O Board（EC2）
I/O board converts AC24V power from control
transformer Tr1 to DC13V/DC5V and supply it to
CPU board.
I/O board energizes magnetic contactors for fan
motor EFM, CFM and phase correction contactor
PCC1 or 2 by receiving order from CPU board.
At the same time, LED lamps wired in parallel
with them are energized and lighted ON. That is
convenience with service work.
●Operation Board（EC3）
Operation board receives input from keyboard and
transmits it to LCD board and CPU board. On the
other hand it transmits signals from CPU board to
LCD board.
If communication between operation board and
CPU board is failed, operation board judges to
display "Communication Interrupted" on LCD and
alarm E903 is shown on trip report.
Configuration items factory set to CPU board have
been copied to operation board. When CPU board is
replaced, these items are transmitted to CPU board.
●Inverter Board（EC8）
Inverter board changes frequency of power source
and controls compressor speed. Inverter board
receives command of rotation speed value from
CPU board. The operating condition during inverter
control (compressor overload, power supply
condition and actual frequency etc.) are transmitted
to CPU board. The judgment for operation
continuing and stopping is conducted by CPU board.
Output from inverter is made of frequent switching
control by power module and results to creating
high temperature. Radiator fin constructed outside
inverter box.
CFM EFM
PT/CT
EC7
Operation board
EC3
Inverter box
Control box
CB
Compressor
AC24V
3 phase AC
380-415V/50Hz
440-460V/60Hz
CM
Inverter board
EC8
ACL Noise filter
board EC9
Sheet key
EC6
LCD
EC4
I/O board
EC2
CPU board
EC1
Fan motors
SV EEV EMV DMV
Sensors Modulation Valves
Solenoid Valves
Input to
CPU board
Output from
CPU board
AC⇒DC⇒Inverter control
Tr1
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1-11
1.4 Operation Mode and Control
1.4.1 Frozen Mode
●Set Point and Control Temperature Sensor
Unit operates in frozen mode between Set Point
-10.0℃〜-30.0℃. The temperature control
in frozen mode is controlled by the return air
temperature sensor (RS).
●Display
FROZEN is displayed
on the upper left
and FULL COOL, or
COOLING OFF is
displayed on the upper
right of the screen. RETURN temperature (RS) is
displayed under SET POINT.
●Operation mode
FULL COOL＜Pull down＞
Compressor runs at full capacity during pull-down
operation. ESV opens to activate economizer
circuit, then pull-down capacity is increased by sub-
cooling the liquid refrigerant entering EEV.
EFM runs at high speed but it runs low speed when
RS drops to -5.0℃.
FULL COOL＜Modulation＞
When RS drops to ≦SP, unit will enter to the
modulating cooling. Compressor speed is
modulated in response to temperature difference
between RS and SP.
COOLING OFF
When RS still drops to ≦SP-0.5℃, unit will enter
to Cooling OFF. Compressor stops and EFM
continues to run at low speed. If temperature rises
to ≧SP+0.5℃, the unit will return to the modulated
cooling.
●Condenser Fan Motor, CFM
CFM will run with high, low or OFF in response to
high pressure (HPT). (High Pressure Control)
▲
▼
FULL COOL
-0.5℃
SP SP
+0.5℃
Falling
Temperature
Rising
Temperature
Cooling OFF
Operation Flow in Frozen Mode
+2.0℃
Modulation
Full cool
with
Economized
cooling
Valve chamber
Economizer
Reheat coil (option)
Condenser
Receiver
Compressor
HPT
HPS
EMV
ESV
LSV Dryer
EEV
LPT
Evaporator
CFM
EFM
RSVHSV PRV
DMV
Sight glass
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1-12
1.4.2 Chilled Mode
●Set Point and Control Temperature Sensor
Unit operates in chilled mode between Set Point
+30.0℃〜-9.9℃controlled by the supply air
temperature sensor (SS).
●Display
CHILLED is displayed on
the upper left and FULL
COOL, MODULATION,
COOLING OFF or
HEATING is displayed
on the upper right of the screen. SUPPLY
temperature (SS) is displayed under SET POINT.
●Operation mode
FULL COOL＜Pull down＞
Compressor runs at full capacity, ESV opens and
economizer is activated. EFM runs with high speed.
MODULATION
When SS drops to ≦SP, unit will enter to modulation.
Compressor speed is adjusted in response to
difference temperature between SS and SP.
COOLING OFF (HEATING OFF)
When SS drops to ≦SP-0.3℃(※), unit will enter
to the Cooling OFF and compressor stops. If SS
temperature rises to ≧SP+0.5℃(※), the unit will
return to modulation.
EFM runs with high or low speed in response to SS.
(※: Control value varies depending on operating
condition.)
HEATING
When SS is ≦SP-0.5℃(※), unit will be in heating
operation. A hot gas is adopted for the heat source.
The operation is same as defrost mode except
EFM runs with high speed.
●Evaporator Fan Motor, EFM
EFM runs at High or Low speed in Modulation as
mentioned above.
●Condenser Fan Motor, CFM
CFM will run with high, low or OFF in response to
high pressure (HPT). (High Pressure Control)
CFM
RSVHSV
DMV
Valve chamber
Economizer
Reheat coil (option)
Condenser
Receiver
HPT
HPS
EMV
ESV
LSV
Dryer
EEV
LPT
Sight glass
Evaporator
EFM
PRV
Compressor
RETURN 2.0C
▲
▼
SUPPLY
MODULATION
-0.5℃*
SP SP
+0.5℃*
+0.3℃*
-0.3℃*
+5.0℃*
Operation Flow in Chilled Mode
Heating
Full cool
with
Economized
cooling
Modulation
Note: Setting values marked with * will vary
depending on the operating conditions.
Falling Temperature Rising Temperature
Cooling OFF
(Heating OFF)
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1-13
1.4.3 Dehumidification Mode (Option)
Dehumidification operation reduces the internal
relative humidity using the reheat coil that heats up
the air cooled by the evaporator.
Heat source of the reheat coil, like the defrosting
operation, uses high temperature refrigerant (hot
gas) discharged from the compressor.
This control is optional, and available for only the
unit equipped with a reheat coil.
The unit equipped with a reheat coil is set to "ON"
at factory referring to ＊12 Configuration Setting in
paragraph 2.3.
●Setting for dehumidification operation
To execute dehumidification operation, selecting
the dehumidification operation set to "ON", (ON-A),
or (Bulb) is necessary.
ON: When dehumidification operation is executed
ONｰA* :When dehumidification operation is executed
for the unit without humidity sensor
Bulb* : When dehumidification operation is executed
in the Bulb mode
OFF: When dehumidification operation is not executed
* Optional functions
●Display
After the settings are
complete, DEHUMID
will appear at the right
side of the screen.
●LED display
The DEHUMID indicator (yellow) lights.
●Dehumidification Operation
Dehumidification operation starts when the
following conditions are met during modulated
cooling in the chilled mode.
Hu＞Setting Hu＋7%
& SP−0.7℃＜SS＜SP＋0.7℃
& RS≦SP＋2.0℃
The above conditions are satisfied continuously for
10 minutes.
When dehumidification operation starts, it supplies
hot gas to the reheat coil. EFM runs at high speed.
Dehumidification Control
Modulated Cooling in Chilled
・Hu＞Setting Hu＋7%
・& SP−0.7℃＜SS＜SP＋0.7℃
・& RS≦SP＋2.0℃
The above conditions are satisfied
continuously for 10 minutes.
・Hu ＜ Setting Hu + 7% continuously for 24 hours
・SS ≧ SP ＋ 1.0℃& Out of range (upper limit)
continuously for 10 minutes*①
・SS ≧ SP ＋ 4.0℃continuously for 10 minutes
・SS ＜ SP − 1.0℃continuously for 20 minutes*①
・SS ＜ SP − 1.0℃& compressor speed is 20 rps
continuously for 20 minutes.*①
Any of the above conditions are satisfied.
* : Excepted under the following conditions
① Within 3 hours after dehumidifying operation starts
●Cancellation of Dehumidification operation
1) Set dehumidification operation to "OFF"
2) 72 hours elapse after power OFF
3) F-PTI completed
4) Chilled PTI completed
5) Frozen PTI completed
RETURN 2.0C
▲
▼
SUPPLY
MODULATION
CFM
RSVHSV
DMV
Valve chamber
Economizer
Reheat coil (option)
Condenser
Receiver
HPT
HPS
EMV
ESV
LSV Dryer
EEV
LPT
Sight glass
Evaporator
EFM
PRV
Compressor
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1-14
1.4.4 Defrost Mode
●Hot-Gas Defrost System
A hot gas system is adopted for the heat source;
I.e. the high temperature and high pressure
refrigerant discharged from the compressor is
supplied to the evaporator and drain pan for
defrosting. Since the ice built on the evaporator
is directly and evenly heated up from the inside,
defrosting can be efficiently performed.
●Display
"DEFROST" is displayed
on the upper right of the
screen.
●LED display
The DEFROST indicator (orange) lights.
●Defrost operation
The pump-down operation is executed by closing
EEV and opening DMV first.
Then the defrost operation will start by closing
DMV and opening HSV and hot gas is supplied to
the evaporator and drain pan. During defrosting,
the compressor speed is adjusted in order to
maintain the optimum hot gas temperature. (High
Pressure Constant Control). Release control
(DMV open, CFM ON) or charge control (ESV and,
EMV open) may be carried out depending on the
operating conditions. After termination of defrosting,
normal temperature control operation will start.
However, the delay timer will cause the evaporator
fan to remain stopped for a maximum of 3 minutes.
●In-Range masking
The control temperature temporarily becomes out-
rage during defrosting, but the IN RANGE LED is
kept ON.
This will avoid misunderstanding that there will be a
problem if the IN RANGE LED is turned OFF.
●Defrost Initiation
Pull-down
Short timer 6Hr
（12Hr when RS<-15℃）
Automatic
detecting
When supply air temperature does not
drop 0.2℃per 1 hr in frozen mode.
"AUTO"
In-Range
Defrost
interval
setting
Defrost interval setting
"3, 6, 9, 12 or 24" Hr
Out-range
timer
Executed by 30 min. timer
after the control temperature
rises out of in-range.
Manual Defrost Executed by Manual defrost key.
●Defrost Initiation Conditions
Timer Count-down Initiation Conditions
Defrost interval (Frozen)
Short timer
Out-range timer
Manual defrost
EOS≦20.0℃
Defrost interval (Chilled) EOS≦20.0℃
& EIS<5.0 ℃
If the initiation conditions are not satisfied when
timer counts down, the defrosting will not be
initiated. If "AUTO" is selected, defrosting will be
executed automatically in accordance with the
accumulation of ice on the evaporator coil.
●Defrost Termination Conditions
Defrosting Time Termination Conditions
＜45 minute
EOS≧20℃
& (RS≧5℃or RS≧5℃with 10 min.
elapse if RS<-20℃at defrost initiation)
≧45 minute
EOS≧25℃
& (RS≧15℃or RS≧5℃with 10 min.
elapse if RS<-20℃at defrost initiation)
90 minute Defrost is forcibly terminated at
90 minutes. (E207）
Economizer
Reheat coil (option)
Condenser
Receiver
Compressor
HPT
HPS
EMV
ESV
LSV Dryer
EEV
LPT
Sight glass
Evaporator
CFM
EFM
RSVHSV PRV
DMV
▲
▼
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