Daikin LX10F10A User manual

TR 11-07
ServiceManual
DAIKININVERTER
CONTAINER
REFRIGERATIONUNIT
LX10F10A or later

1
Make sure to read these instructions before operation.
This manual provides the minimum information required to operate
the container refrigeration unit LX10F 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
・Operation manual for personal computer software

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 User Specifications ………………………… 1-17
1.5.1
ASC, Automatic Setpoint Change (Option) …1-17
1.5.2 Cold Treatment Transport (Option) …… 1-18
1.5.3
ACT, Automatic Cold Treatment (Option) …1-18
1.5.4
Ventilator Volume Detection (FA Sensor) (Option) …1-19
1.5.5
Remote Monitoring Receptacle (Option) …1-19
1.5.6 Battery Mode …………………………… 1-19
1.5.7
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 Gauge Manifold …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…………………………… 4-16
4.8.4 CPU Board ……………………………… 4-16
4.8.5 I/O Board………………………………… 4-17
4.8.6 Operation Board………………………… 4-17
4.8.7 PT/CT Board …………………………… 4-17
4.8.8 High Pressure Switch (HPS) ………… 4-18
4.8.9 High Pressure Transducer (HPT) …… 4-18
4.8.10 Low Pressure Transducer (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 Drier …………………………………… 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 Transducer Characteristics ………… 5-7
5.4
Humidity Sensor Characteristics, HuS (Option) …5-7
5.5 HFC134a Characteristics……………………… 5-8
5.6 Sequence ……………………………………… 5-9

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 P2 and N
on the inverter board is lowered to DC50V or
below before starting inspection.
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 atomosphere
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 aluminium 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.
Be sure to only charge the unit with refrigerant
R134a.
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 any 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 legislation.
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

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 User Specifications
1.5.1 ASC, Automatic Setpoint Change (Option)
1.5.2 Cold Treatment Transport (Option)
1.5.3 ACT, Automatic Cold Treatment (Option)
1.5.4 Ventilator Volume Detection (FA Sensor) (Option)
1.5.5 Remote Monitoring Receptacle (Option)
1.5.6 Battery Mode
1.5.7 Information Interchange with Personal Computer

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 dedicated type
Controller DECOSⅤ
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:
440W/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 defrost control
Refrigerant (charged quantity) R134a (For refrigerant charging amount, refer to the name
plate, unit performance)
Refrigerant oil (charged quantity) IDEMITSU, Daphne hermetic oil FVC68D (1.9 L)
Weight For detail, refer to the name plate, unit performance
●The resistance of solenoid coil
Component name Coil Resistance
Compressor motor 0.52Ω(20℃), 0.63Ω(75℃)
Condenser fan motor High speed: 30.6Ω±5% (20℃) / Low speed: 21.6Ω±5% (20℃)
Evaporator fan motor High speed: 17.2Ω±5% (20℃) / Low speed: 11.4Ω±5% (20℃)
Solenoid valve LSV, ESV, HSV, RSV 15.2 Ω±10% (20℃)
Modulation valve EEV, EMV, DMV 46±3Ω/phase（20℃）

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 control valve PCV 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 (with earth leakage
breaker) CB 30A −
Inverter
circuit
Fin temperature
(IPM protection) VOT ON＞90℃E52C
Instantaneous overcurrent
NIDC
ON 51Ap±10% E52E
F52E
Electronic thermal 1
(Compressor overcurrent
protection 1)
ON＞22.5A, OFF≦0.3A E523
Electronic thermal 2
(Compressor overcurrent
protection 2)
ON＞30A, OFF≦1A E524
Lightning detection
VDC
ON≧125r/s (actual r/s - designated r/s) E526
Power-supply voltage imbalance ON≧DC35V (Ripple voltage) E531
Undervoltage ON≦DC290V E532
Overvoltage ON≧DC790V
●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 protection) −
F6U Surge absorber 2 (Lightning protection) −
F7U Surge absorber 3 (Lightning protection) −
F8U 8A 600V Inverter control circuit −
I/O board
（EC2）
TH1 2.5A 72V
Automatic reset
RM (Remote Monitoring) circuit −
TH2 TransFresh circuit −

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)
Contents on unit name plate
Model name
MFG number
MFG Year & Month
R134a charge amount [kg]a
Unit weight [kg]
④
Sight glass
Receiver
SGS
Compressor chamber
HPT
LPT
②
Inverter compressor
DCHS2
DCHS1
HPS
①
Display panel & key pad
Model name plate
Compressor cover
Storage space
for power cable
Ventilator Condenser fan
Inverter box
Valve chamber
LSV
ESV
EEV
Drier
EMV
HSV RSV DMV
PRV
③
Economizer
Eco In
Eco Out
Control box
Access panel
1.3 Construction
1.3.1 Outside View

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 and Temperature Sensor
(Option)
PPR ：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 Evaporator fan
Top View HuS
(Option)
SS,DSS
Evaporator
Reheat coil
(Option)
EIS
EOS
USDA1
(Option)
PPR
USDA2
USDA3
CTR

1-6
1.3.3 Control Box
BAT ：Wake-up Battery (Rechargeable Battery)
C/B ：Circuit Breaker
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
PPR ：PC Port Receptacle
PT/CT ：PT/CT Board
RCD ：Modem (Option)
RM ：Remote Monitoring Receptacle (Option)
Tr1 ：Transformer for Operating Circuit
CFL
PCC1
PCC2
C/B
RCD
I/O board
CPU board
BAT
Tr1
(Behind of C/B)
USB port
EFLEFH CFH
Earth terminal block
PPR PT/CT
(Behind of RCD)
Short circuit connectors for
emergency operation
LCD screenOperation key

1-7
1.3.4 CPU Board and I/O Board
I/O board（EC2）CPU board（EC1）
USB port
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

1-8
1.3.5 Inverter Box
B1L
B2L
B3L
A206X
A3X
A202X
P2
1P
W
V
U
A4X
XA6
N
L1I
AC-L Coil
Cooling fan
Noise filter board
(rear side)
Inverter board
(on right side wall)
AC-L Coil
(Option)
(on left side wall)
DC-L Coil
Compressor magnetic switch
(rear side)
R phase coil
S phase coil
T phase coil
Inverter board（EC8）
Noise filter board（EC9）
L1B-2L1BL2BL3B
F5U
12.5A AC300V
F6U
12.5A AC300V
F7U
12.5A AC300V
L1AL2AL3A
F8U
8A AC/DC500V
X91A
Note: Inverter box internal wiring is put on cover of box.

1-9
Sensor mounted in outside
Sensor mounted in inside
RS/DRS
SS/DSS
AMBS
EOS
EIS
Eco Out
DCHS2
SGS
Eco In
HuS
DCHS1
Valve chamber
Economizer
Reheat coil (option)
Condenser
Receiver
Compressor
HPT
HPS
EMV
ESV
LSV Drier
EEV
LPT
Sight glass
Evaporator
CFM
EFM
RSVHSV PRV
DMV
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 quantity
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 to conduct release control.
EMV: Economizer Modulation Valve
EMV controls the refrigerant supply quantity 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. The EMV is also
used for the discharge pipe temperature control
and charging control during defrost and heating
operation.
ESV: Economizer Solenoid Valve
ESV is opened and closed in conjunction with
the 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 regulating
valve. It releases the refrigerant to the low
pressure side when the pressure rises
abnormally.
Valve chamber
EMV
ESV
LSV
EEV
C
F
M
RSV
HSV
PRV
DMV

1-10
1.3.8 Printed Circuit Board
●CPU Board（EC1）
Controller described in this manual means 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 down-loaded
with USB memory or PC installed DCCS software.
When commercial power OFF, some of setting work
and data confirmation can be available by wake-
up battery power (Rechargeable battery). Data
download and software upload are 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 relays 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
CPU board logs alarm E903.
Configuration items factory set to CPU board have
been copied to operation board. When CPU board
is replaced, these items is transmitted to CPU
board.
●Inverter Board（EC8）
Inverter board changes frequency of power source
and controls compressor speed. Inverter board
receives command of revolution number from CPU
board. The operating condition during inverter
control (compressor overload, power supply
condition and actual frequency etc.) are transmitted
to CPU board. The judging of operation continuing
and stopping is conducted by CPU board.
Frequency change is made of frequent switching
control with diode bridge circuit and results high
temperature. Cooling fan circulates air inside
inverter box and cooling fin constructed outside the
box.
CFM EFM
PT/CT
EC7
Operation board
EC3
Inverter box
Control box
C/B
Compressor
AC24V
3 phase AC
380-415V/50Hz
440-460V/60Hz
CM
Inverter board
EC8
ACL Noise filter
board EC9
MC
Sheet key
EC6
LCD
EC4
I/O board
EC2
CPU board
EC1
Tr
Fan motors
SV EEV MEV DMV
Sensors Modulation Valves
Solenoid Valves
Input to
CPU board
Output from
CPU board
AC⇒DC⇒Quasi-AC
Quasi-AC

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 PULL-DOWN,
or COOLING OFF
is displayed on the
upper right of the screen. RETURN temperature
(RS) is displayed under SET POINT.
●＜Pull-down operation＞
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℃.
＜Modulated Cooling＞
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+1.0℃, 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)
Valve chamber
Economizer
Reheat coil (option)
Check valve
Condenser
Receiver
Compressor
HPT
HPS
EMV
ESV
LSV Drier
EEV
LPT
Sight glass
Evaporator
CFM
EFM
RSVHSV PRV
DMV
▲
▼
-0.5℃
SP SP
+1.0℃
Falling
Temperature
Rising
Temperature
Cooling OFF
Operation Flow in Frozen Mode
+2.0℃
Modulated
Cooling
Pull-down
with
Economized
cooling

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 PULL-DOWN,
MODULATING,
Cooling OFF or
HEATING is displayed
on the upper right of
the screen. SUPPLY temperature (SS) is displayed
under SET POINT.
●＜Pull-down operation＞
Compressor runs at full capacity, ESV opens and
economizer is activated, which is the same as frozen
mode. EFM runs with high speed.
＜Modulated Cooling＞
When SS drops to ≦SP, unit will enter to the
modulated cooling. Compressor speed is
modulated in response to temperature difference
between SS and SP.
＜Cooling 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 the
modulated cooling.
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,
which is same as defrost mode. 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 modulated
cooling mode as mentioned above. EFM runs
always high speed only or low speed only
depending on user's requirement.
●Condenser Fan Motor, CFM
CFM will run with high, low or OFF in response to
high pressure (HPT). (High Pressure Control)
Compressor
CFM
RSVHSV
DMV
Valve chamber
Economizer
Reheat coil (option)
Condenser
Receiver
HPT
HPS
EMV
ESV
LSV
Drier
EEV
LPT
Sight glass
Evaporator
EFM
PRV
RETURN 2.0C
▲
▼
SUPPLY
-0.5℃
SP SP
+0.5℃
Falling
Temperature
+0.3℃
Rising
Temperature
-0.3℃
+5.0℃
Operation Flow in Chilled Mode
Heating
Pull-down
with
Economized
cooling
Modulated
Cooling
Cooling OFF

1-13
1.4.3 Dehumidification Mode (Option)
The dehumidification operation lowers humidity
using the reheater that heats the air cooled by the
evaporator.
Heat source of the reheater, 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
●Display
After completion of
setting, "DEHUMID" is
indicated on right.
●Dehumidification Operation
Dehumidification operation starts when the
following conditions are met during modulated
cooling in the chilled mode.
RH＞Setting humidity RH
& SS＜SP±0.7℃with 5 min. elapse
or SS＞SP-0.7℃with 5 min. elapse
When dehumidification operation starts, it supplies
hot gas to the reheater. EFM runs at high speed.
Modulated Cooling in Chilled
Dehumidification Control
RH＞Setting humidity RH
& SS＜SP±0.7℃
with 5 min. elapse
or SS＞SP-0.7℃
with 5 min. elapse
RH＜Setting humidity RH-7%
with 3 min. elapse
or SS＞SP+0.5℃
with 20 min. elapse
or SS＜SP-0.5℃
with 20 min. elapse
●Cancellation of Dehumidification operation
1) Set dehumidification operation to "OFF"
2) 48 hours elapse after power OFF
3) F-PTI completed
4) Chilled PTI completed
5) Frozen PTI completed
CFM
RSVHSV
DMV
Valve chamber
Economizer
Reheat coil (option)
Condenser
Receiver
HPT
HPS
EMV
ESV
LSV Drier
EEV
LPT
Sight glass
Evaporator
EFM
PRV
RETURN 2.0C
▲
▼
SUPPLY

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.
●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 modulated in order to
maintain the optimum hot gas temperature. (High
Pressure Constant Control). The release control
(DMV open, CFM ON) or charge control (ESV ON,
EMV open) is executed for compressor protection.
After termination of defrosting, normal temperature
control operation will start without running EFM for
the first 3 minute by delay timer.
●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 MDS key.
●Defrost Initiation Conditions
Timer Count-down Initiation Conditions
Defrost interval (Frozen)
Short timer
Out-range timer
Manual defrost (MDS key)
EOS≦20.0℃
Defrost interval (Chilled) EOS≦20.0℃
& EIS<5.0 ℃
If the initiation conditions are not met 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≧30℃
& (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)
Check valve
Condenser
Receiver
Compressor
HPT
HPS
EMV
ESV
LSV Drier
EEV
LPT
Sight glass
Evaporator
CFM
EFM
RSVHSV PRV
DMV
▲
▼

1-15
1.4.5 Compressor, Fan Motor, Valve Function
●Frozen Mode
Component Name Pull-down Modulated
Control Cooling Off ------ Notes -----
※1 EFM operates at
RS≦-5.0℃
※2 High pressure
control
※3 EFM operates
H only or L only
depend on user
requirement
EEV fully open: 420 pls
EMV fully open: 300 pls
DMV fully open: 760 pls
Motor
Compressor
CM※7,8 Max.130r/s 20〜130r/s OFF
Evaporator fan motor EFM H（L ※1）LL
Condenser fan motor CFM H/L/OFF ※2 H/L/OFF ※2OFF
Solenoid
Valve
Liquid solenoid valve LSV ON ON OFF
Economizer solenoid valve ESV ON ON OFF
Hot gas solenoid valve HSV OFF OFF OFF
Reheat solenoid valve RSV OFF OFF OFF
Modulation
Valve
Electronic expansion valve EEV※8 2〜100% 2〜100% 0%
Economizer modulation valve EMV※8 2〜100% 2〜100% 0%
Discharge modulation valve DMV※8 100% 100% 100%
●Chilled Mode ●
Dehumidification mode
Component
Name Pull-down Modulated
Control Cooling Off Heating Dehumidification
Motor
CM※7, 8 Max.130r/s 20〜130r/s OFF 20〜95r/s 20〜95r/s
EFM H H/L ※3 H/L H/OFF H
CFM H/L/OFF ※2 H/L/OFF ※2 OFF OFF（L/H ※5）H（L/OFF ※6）
Solenoid
Valve
LSV ON ON OFF OFF（ON/OFF ※4）ON
ESV ON ON/OFF OFF OFF（ON ※4）OFF
HSV OFF OFF OFF ON（ON/OFF ※4,5）OFF
RSV OFF OFF OFF OFF ON
Modulation
Valve
EEV※8 2〜100% 2〜100% 0% 0%（0〜36% ※4）2〜100%
EMV※8 2〜100% 2〜100% 0% 0%（24〜24% ※4）0%
DMV※8 100% 100% 100% 0%（0〜100% ※4）
（13〜100% ※5）20〜100%
●Defrost Mode
Component
Name Pumpdown Defrost ------ Notes -----
※4 Charging control
※5 Release control
※6 CFM may become L/OFF in some case to
increase dehumidification capacity.
※7 Compressor may reduce its revolution
prior to take protection control when
the protection control activated in some
reason.
※8 Compressor revolution（r/s）and EEV,
EMV, DMV opening（pls）are displayed in
panel.（Refer to ※3 Sensor information in
paragraph 2.3.）
Motor
CM※7, 8 Max.50r/s 20〜95r/s
EFM H/L/OFF ※2OFF
CFM H OFF（L/H ※5）
Solenoid
Valve
LSV ON OFF（ON/OFF ※4）
ESV OFF OFF（ON ※4）
HSV OFF ON（ON/OFF ※4,5）
RSV OFF
OFF（ON/OFF ※4,5）
Modulation
Valve
EEV※8
0% 0%（0〜36% ※4）
EMV※8 0% 0%（0〜24% ※4）
DMV※8 100% 0%（0〜100% ※4）
（13〜100% ※5）