Daikin LRMYS0180AXY1 User manual

RJ0110030013877
Medium Temperature
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Sees
AIR COOLED
SPLIT COMMERCIAL
CONDENSING UNIT
INSTALLATION, TECHNICAL,
MAINTENANCE
IOM NO: T-CU11-OCT22-0

T-CU11-OCT22-0 Page II
IMPORTANT!
READ BEFORE PROCEEDING!
GENERAL SAFETY GUIDELINES
This guideline is intended for users to ensure safe installation, operation, and maintenance of DAIKIN SEES condensing
units. This guideline is not intended to replace the system expertise available from the system manufacturers.
This equipment is a relatively complicated apparatus. During installation, operation, maintenance or service, individuals
may be exposed to certain components or conditions including, but not limited to refrigerants, materials under pressure,
rotating components, and both high and low voltage. Each of these items has the potential, if misused or handled
improperly, to cause bodily injury or death. It is the obligation and responsibility of operating/service personnel to
identify and recognize these inherent hazards, protect themselves, and proceed safely in completing their tasks. Failure to
comply with any of these requirements could result in serious damage to the equipment and the property in which it is
situated, as well as severe personal injury or death to themselves and people at the site.
This document is intended for use by owner-authorized operating/service personnel. It is expected that these individuals
possess independent training that will enable them to perform their assigned tasks properly and safely. It is essential that,
prior to performing any task on this equipment, this individual shall have read and understood this document and any
referenced materials. This individual shall also be familiar with and comply with all applicable governmental standards
and regulations pertaining to the task in question
SAFETY SYMBOLS
The following symbols are used in this document to alert the reader to specific situations:
WARNING
Warning! Risk of serious injury or death
to person!
NOTICE
Notice! Risk of damage to
equipment!
CAUTION
Caution! Danger which can lead to
serious damages!

T-CU11-OCT22-0 Page III
Contents
PRODUCT FEATURES ..................................................1
MODEL NAME ............................................................1
Figure 1: Nomenclature...........................................1
EXPLODED VIEWS.......................................................2
Table 1: Exploded View Indicator............................2
Figure 2: Exploded View LRMYS0180AXY1..............2
Figure 3: Exploded View LRMYS0250AXY1..............3
Figure 4: Exploded View LRMSS0400FXY1;
LRMSS0500FXY1; LRMSS0600FXY1 .........................3
SPECIFICATIONS .........................................................4
Table 2: Unit Data....................................................4
Table 3: Unit Sound Data and Dimension................4
OUTLINE DRAWINGS ......................................................5
Figure 5: Outline Drawing LRMYS0180AXY1;
LRMYS0250AXY1 .....................................................5
Figure 6: Outline Drawing LRMSS0400FXY1;
LRMSS0500FXY1; LRMSS0600FXY1 .........................5
PERFORMANCE DATA .....................................................6
APPLICATION GUIDELINES..........................................8
Table 5: Application Envelope.................................8
COMPRESSOR ...............................................................8
Rotary Compressor...............................................8
Phase Sequence and Reverse Rotation Protection
.............................................................................8
Voltage Imbalance ...............................................9
Overload and Overheating Protection .................9
OVER PRESSURE PROTECTION ..........................................9
Low Pressure Switch.............................................9
High Pressure Switch..........................................10
PUMP DOWN RECOMMENDATIONS ................................10
Table 6: High- and Low-Pressure Switch Settings..10
Figure 7: Piping Diagram for Pump Down System.11
SUCTION ACCUMULATOR ..............................................11
DISHARGE THERMOSTAT...............................................11
CRANKCASE HEATERS ...................................................11
HEALTH AND SAFETY................................................12
GENERAL INFORMATION ...............................................12
Before Installation..............................................12
Offloading and Lifting ........................................12
During Installation and subsequent maintenance
...........................................................................12
INSTALLATION..........................................................13
UNIT LOCATION...........................................................13
INSTALLATION CLEARANCES............................................13
FIELD PIPING ..............................................................14
SYSTEM CLEANLINESS...................................................14
PRESSURE TESTING ......................................................15
Table 7: Maximum Test Pressures.........................15
EVACUATION ..............................................................15
SYSTEM CHARGING......................................................16
Table 8: Internal Volume of Liquid Line.................16
ELECTRICAL ................................................................17
Table 9: Power Supply Wiring Sizes...................... 17
WIRING DIAGRAMS......................................................18
Figure 8: Wiring Diagram LRMYS0180AXY1;
LRMYS0250AXY1................................................... 18
Figure 9: Wiring Diagram LRMSS0400FXY1;
LRMSS0500FXY1; LRMSS0600FXY1....................... 18
COMMISSIONING.....................................................19
PRE STARTUP CHECKS ...................................................19
RUNNING THE UNIT .....................................................19
SYSTEM OPERATION.....................................................19
SERVICE AND MAINTENANCE...................................20
Table 10:Tightening Torque.................................. 21
CHECK LIST ...............................................................22
BEFORE START-UP...................................................22
DURING COMMISSIONING......................................23
SITE RECORDS .........................................................23

T-CU11-OCT22-0 Page 1
Product Features
Daikin condensing unit is a partly completed machinery which need to incorporate with indoors, to provide cooling for
refrigerated goods. The unit comprise of single fixed speed compressor and condenser in a fully enclosed powder
coated housing.
Standard features for all medium model:
•Panasonic rotary compressors
•Panasonic scroll compressors
•Aluminium –copper condenser coil
•Vertical liquid receiver with fusible plug (stop valve on receiver outlet only applicable to model:
LRMSS0400/500/600FXY1)
•Fitted with brazed type liquid line drier & sight glass
•Low pressure switch (adjustable for pump down) –default: auto reset
•High pressure safety switch (manual reset cartridge type)
•Liquid and suction services valves on external of unit
•IPX4 rated control panel
•Fuse protection for 1phase controller and fan motor
•Overload and high discharge temperature protection (Only applicable to model: LRMYS0180/250AXY1)
•Acoustic compressor jacket (Only applicable to model: LRMYS0180/250AXY1)
•Acoustic insulation on compressor compartment (Only applicable to model: LRMSS0400/500/600FXY1)
•Robust weatherproof housing
•Approved refrigerants: R404A, R448A & R449A (Data for R448A & R449A will be provided upon request)
Model Name
Figure 1: Nomenclature
Application
L: Refrigeration
Additional Features
F: Fan Speed Controller
Blank: Without Fan Speed Controller
Unit Category
R: Outdoor Unit
F: Indoor Unit
Compressor Type
MY: Medium Temperature Rotary
MS: MediumTemperature Scroll
LS: Low Temperature Scroll Liquid Injection
LV: Low Temperature Scroll Vapor Injection
Compressor Horse Power
0180: 1.8HP
2
R
3-4
MY
5
F
11
A
6
S
7-10
0180
1
L
13-14
Y1
BOM Variance
A: A Casing
F: F Casing
Refrigerant
S: R404A
Power
V1: 220~240V, 1Ph, 50Hz
Y1: 380~415V, 3Ph, 50Hz
12
X
Manufactuing Plant
X: DRM

T-CU11-OCT22-0 Page 2
ExplodedViews
Table 1: Exploded View Indicator
Item
Description
1
COMPRESSOR
2
COMPRESSOR OIL
3
LIQ. RECEIVER
4
CONDENSER
5
FAN PROPELLER
6
FAN MOTOR
7
FAN GUARD
8
FAN CAPACITOR
9
PRESSURE SWITCH LOW
10
LOW PRESSURE TAPPING
11
PRESSURE SWITCH HIGH
12
FUSE
13
FUSE HOLDER
14
TERMINAL BLOCK
15
CONTACTOR
16
OVERLOAD RELAY
17
VALVE SERVICE
18
FILTER DRIER
19
SIGHT GLASS
20
BRACKET SERVICE VALVE
21
BRACKET FAN MOTOR
22
PANEL BASE
23
PANEL TOP
24
PANEL FAN
25
PANEL LEFT - REAR
26
PANEL RIGHT - REAR
27
PANEL FRONT - RIGHT
28
VALVE COVER ASSEMBLY
29
COMPRESSOR JACKET
30
HANDLE
31
FOAM EPS COIL TOP
32
BRACKET LIQUID PIPE
Figure 2: Exploded View LRMYS0180AXY1

T-CU11-OCT22-0 Page 3
Exploded View
Figure 3: Exploded View LRMYS0250AXY1
Figure 4: Exploded View LRMSS0400FXY1; LRMSS0500FXY1; LRMSS0600FXY1

T-CU11-OCT22-0
Specifications
Table 2: Unit Data
Casing
Model
Compressor
Electrical Data
Connections
Liquid
Receiver
Coil
Volume
Air
flow
Model
Displacement
Charge
Limit
Oil
charge
Compressor
Fan
Liquid
Suction
(cm3/rev)
(kg)
(L)
NC
(A)
MOC
(A)
MCC
(A)
LRC
(A)
Qty.
FLC
(A)
Inch
Inch
(L)
(L)
(m3/h)
2
LRMYS0180AXY1
KSVB28P14AA
28.2
1.25
0.7
2.9
5.0
5.0
20
1
0.4
3/8"
1/2"
2.4
1.62
1874
LRMYS0250AXY1
JSVB39P14AA
38.6
2.1
1.1
3.8
6.5
6.5
26
1
0.5
3/8"
5/8"
2.4
1.97
2548
3
LRMSS0400FXY1
3CB067SA0M
66.8
4.8
1.7
5.9
8.8
11.8
48
1
1
1/2"
7/8”
7.6
4.2
4280
LRMSS0500FXY1
3CB084SA0M
84.4
4.8
1.7
7.1
10.2
15.3
61
1
1
1/2"
7/8”
7.6
4.2
4280
LRMSS0600FXY1
3CB100SA0M
99.8
4.8
1.7
8.2
11.7
16.1
67
1
1
1/2"
7/8”
7.6
4.07
3910
Oil type: FV68S
LRC = Lock Rotor Current
NC = Nominal Current rated at -100C Te /+320C Ta
FLC = Full Load Current
MOC = Maximum Operating Current
MCC = Maximum Continuous Current (current drawn by compressor before internal protector trip)
Table 3: Unit Sound Data and Dimension
Model
SPL @ 10m
dB(A)
Overall Dimensions (mm)
Mounting Dimensions (mm)
Dry Weight
Gross Weight
Width
Depth
Height
Width
Depth
(kgs)
(kgs)
LRMYS0180AXY1
27
855
318
651
603
362
45
49
LRMYS0250AXY1
28
855
318
753
603
362
55
59
LRMSS0400FXY1
34
1349
544
870
945
500
104
126
LRMSS0500FXY1
35
1349
544
870
945
500
106
128
LRMSS0600FXY1
35
1349
544
870
945
500
112
134
Sound Pressure Level (SPL) measured in an anechoic room at -10°C Te /+32°C Ta MT conditions. Alternative conditions may produce different results.

T-CU11-OCT22-0 Page 5
Specifications
Outline Drawings
Figure 5: Outline Drawing LRMYS0180AXY1; LRMYS0250AXY1
Figure 6: Outline Drawing LRMSS0400FXY1; LRMSS0500FXY1; LRMSS0600FXY1

T-CU11-OCT22-0 Page 6
Specifications
Performance Data
The performance data shown in Table 4 is rated at suction superheat 10K, sub cooling 0K. Different rating condition
will produce different cooling capacity.
•Te: Evaporating Temperature (0C)
•Ta: Ambient Temperature (0C)
•CC: Cooling Capacity (W)
•PC: Power Consumed (W)
•COP: Coefficient of Performance (W/W)
•Data presented in accordance with BS
EN13215:2016
Table 4: R404A Medium Temperature Performance Data
MODEL
Ta Te
-20
-15
-10
-5
0
5
10
LRMYS0180AXY1
27
CC
1646
2373
3100
3828
4555
5283
6010
27
PC
1208
1260
1312
1364
1416
1468
1520
27
COP
1.36
1.88
2.36
2.81
3.22
3.60
3.95
32
CC
1461
2091
2720
3350
3979
4609
5238
32
PC
1362
1410
1458
1506
1554
1602
1650
32
COP
1.07
1.48
1.87
2.22
2.56
2.88
3.17
38
CC
1394
1951
2507
3064
3621
4177
4734
38
PC
1384
1458
1531
1605
1679
1753
1826
38
COP
1.01
1.34
1.64
1.91
2.16
2.38
2.59
43
CC
1293
1777
2261
2746
3230
3715
4199
43
PC
1430
1520
1610
1700
1790
1880
1970
43
COP
0.90
1.17
1.40
1.62
1.80
1.98
2.13
46
CC
1658
2095
2532
2968
3405
46
PC
1579
1674
1769
1863
1958
46
COP
1.05
1.25
1.43
1.59
1.74
LRMYS0250AXY1
27
CC
2462
3459
4455
5452
6448
7445
8442
27
PC
1611
1684
1756
1829
1901
1974
2046
27
COP
1.53
2.05
2.54
2.98
3.39
3.77
4.13
32
CC
2347
3255
4164
5072
5980
6888
7796
32
PC
1716
1804
1892
1979
2067
2155
2242
32
COP
1.37
1.80
2.20
2.56
2.89
3.20
3.48
38
CC
2209
3011
3814
4616
5418
6220
7022
38
PC
1840
1943
2046
2149
2251
2354
2457
38
COP
1.20
1.55
1.86
2.15
2.41
2.64
2.86
43
CC
2094
2808
3522
4236
4949
5663
6377
43
PC
1940
2050
2160
2270
2380
2490
2600
43
COP
1.08
1.37
1.63
1.87
2.08
2.27
2.45
46
CC
2686
3347
4007
4668
5329
46
PC
2140
2270
2400
2530
2660
46
COP
1.26
1.47
1.67
1.85
2.00

T-CU11-OCT22-0 Page 7
Continued
MODEL
Ta Te
-20
-15
-10
-5
0
5
10
LRMSS0400FXY1
27
CC
5801
6791
7943
9291
10876
12745
14952
27
PC
2797
2931
3077
3234
3400
3572
3747
27
COP
2.07
2.32
2.58
2.87
3.20
3.57
3.99
32
CC
5301
6214
7270
8507
9965
11692
13739
32
PC
3033
3178
3335
3503
3679
3862
4048
32
COP
1.75
1.96
2.18
2.43
2.71
3.03
3.39
38
CC
4747
5584
6543
7661
8980
10548
12417
38
PC
3346
3504
3674
3855
4044
4238
4436
38
COP
1.42
1.59
1.78
1.99
2.22
2.49
2.80
43
CC
5113
6003
7035
8250
9696
43
PC
3800
3981
4172
4371
4576
43
COP
1.35
1.51
1.69
1.89
2.12
46
CC
4853
5709
6694
7851
46
PC
3988
4176
4373
4578
46
COP
1.22
1.37
1.53
1.71
LRMSS0500FXY1
27
CC
7157
8296
9580
11003
12564
14268
16122
27
PC
3237
3516
3807
4101
4389
4664
4921
27
COP
2.21
2.36
2.52
2.68
2.86
3.06
3.28
32
CC
6488
7557
8792
10181
11721
13410
15253
32
PC
3643
3907
4177
4444
4704
4950
5179
32
COP
1.78
1.93
2.10
2.29
2.49
2.71
2.94
38
CC
5759
6759
7939
9286
10791
12453
14270
38
PC
4201
4433
4665
4892
5110
5315
5507
38
COP
1.37
1.52
1.70
1.90
2.11
2.34
2.59
43
CC
6169
7307
8615
10085
43
PC
4919
5109
5294
5472
43
COP
1.25
1.43
1.63
1.84
46
CC
5847
6961
8245
9692
46
PC
5230
5392
5549
5700
46
COP
1.12
1.29
1.49
1.70
LRMSS0600FXY1
27
CC
8185
9497
11125
13024
15164
17529
20114
27
PC
3967
4251
4545
4842
5131
5403
5653
27
COP
2.06
2.23
2.45
2.69
2.96
3.24
3.56
32
CC
7511
8758
10298
12086
14092
16296
18692
32
PC
4417
4697
4986
5275
5555
5818
6060
32
COP
1.70
1.86
2.07
2.29
2.54
2.80
3.08
38
CC
6762
7952
9399
11065
12917
14936
17110
38
PC
5023
5293
5568
5842
6105
6353
6582
38
COP
1.35
1.50
1.69
1.89
2.12
2.35
2.60
43
CC
7346
8729
10301
12032
43
PC
5839
6098
6353
6599
43
COP
1.26
1.43
1.62
1.82
46
CC
7012
8361
9881
46
PC
6189
6435
6678
46
COP
1.13
1.30
1.48

T-CU11-OCT22-0 Page 8
Application Guidelines
Eensure that the refrigeration system which adopt this condensing unit MUST
integrated with pump down features (solenoid valve installed at condensing unit liquid
line outlet and energized by room thermostat). Failure to fulfill this requirement cause
liquid compression and as consequence reduce lifetime of compressor.
Table 5: Application Envelope
Operating Limits
Recommendation
Discharge gas temperature
1050C maximum for rotary compressor
1150C maximum for scroll compressor
Evaporator outlet superheat
Above 6K (to avoid liquid flood back)
Suction gas superheat at compressor inlet
Not more than 20K
Voltage supply
Min: 360V, Max: 440V
Phase asymmetry
+/- 2%
Frequency
50Hz +/- 1%
Outdoor ambient
Min: 200C, Max: Refer Performance Data
Suction line shall be insulated to avoid:
•High superheat during high ambient condition that can create high discharge temperature.
•Too low superheat during low ambient condition that can condense refrigerant inside suction line.
Compressor
Rotary Compressor
The rotary compressor inside DAIKIN
condensing unit is a high-pressure dome
compressor, with 2 poles 3phase AC motor.
The pressure inside the shell of compressor
is a high (discharge) pressure and have high
temperature. Care must be taken when orientate the
power supply cables to the compressor. Never touch
the power supply cable to body of compressor, unless
heat resistant cables are used.
When replace rotary compressor, follow sequence below for
removing seal caps from the compressor:
i. Place the compressor in vertical position
ii. Remove seal cap from discharge tube and then
iii. Remove seal cap from suction tube
Phase Sequence and Reverse Rotation Protection
3 phase scroll and rotary compressor require proper phase sequence to secure correct
rotation direction and therefore compression. The phase sequence must be secured
between incoming power supply and compressor.
Three phase scroll and rotary compressor motors are designed to run only in one direction. The correct rotation of a
three-phase compressor motor depends on the connection of the three incoming phases to the unit. Correct rotation
can be determined by a drop in suction pressure and a rise in discharge pressure when the compressor is energized.

T-CU11-OCT22-0 Page 9
Application Guidelines
Running the compressor for a short period of time in reverse direction will have no negative impact but prolonged
running in reverse direction may cause premature failure. To reverse the rotation of a three-phase scroll compressor,
shut off the incoming power supply to the unit, swap connection of any two of the three incoming phases at the unit’s
terminal block, reapply power to the unit and following compressor restart, recheck operating pressures.
For three phase systems, reverse rotation module in the system control unit is recommended in preventing three
phases compressor from running in the reverse rotational direction.
Voltage Imbalance
When the compressor is starting, the high starting current will cause drop of voltage. There is a possibility that
compressor fail to start if the starting voltage is too low. Thus, each phase voltage measured at the terminal of three
phase scroll/rotary compressor should be ±2% of the average of all phases.
Overload and Overheating Protection
For rotary 3 phase compressor: the compressor is protected by internal thermostat with specification (cut out =
110±4⁰C, cut in = 95±5⁰C). The internal thermostat connected to external overload protector, to disconnect all three
phases at contactor in case of overtemperature and overcurrent.
Overheating could be due to compressor working at high compression ratio (low evaporating and high condensing
pressure); loss/ inadequate charge; or condenser fan not working. Time must be allowed for the compressor to cool
down before the thermostat to reset.
For scroll compressor, an internal line break motor protector is located at the center of the Y of the motor windings
(motor located in low pressure dome), to disconnect all three phases in case overcurrent or overtemperature condition.
The protector is the automatic reset device containing snap action bimetal switch which reacts to a combination of
motor current and motor windings temperature. When internal motor protector has tripped, it will take 30 to 40
minutes to reset and then the compressor will restart.
On a field application, when the internal motor protector has tripped, the compressor will stop while each of 3
terminals is still energized, to which either the customer or serviceman may regard the compressor as fail down.
Therefore, the above-mentioned situation should be taken into consideration.
Over Pressure Protection
All Daikin condensing units are fitted with adjustable auto reset low pressure switch and manual reset cartridge type
high pressure switch.
Low Pressure Switch
The low-pressure safety switch protects the compressor against deep vacuum operation or loss of refrigerant
conditions, to avoid internal arcing at the electric terminal and the damage of compressor.
When low pressure occurs outside of compressor limit, the temperature in the compressor motor will rise rapidly.
Sometimes, the low-pressure switch will react in priority to the action of the discharge thermostat or motor internal
protector when huge amounts of refrigerant leaks in short time.

T-CU11-OCT22-0 Page 10
Application Guidelines
The low-pressure safety cut out should never be set below the
settings as shown in the Table 6 and THE SETTINGS MUST BE
ADJUSTED TO SUIT THE APPLICATION BEFORE STARTING THE
UNIT.
Setting Procedure for Single Pressure Switch:
i. Cut in range: Turning the range adjusting screw (4)
clockwise will decrease the cut-in pressure setting and
vice versa.
ii. Differential range: Turning the differential adjusting screw
(5) clockwise will increase the differential pressure setting
and vice versa.
High Pressure Switch
Manual reset cartridge type high-pressure switch is integrated in the condensing unit to protect the compressor during
blocked fan or fan failure conditions. After fault is removed and high side pressure drops below 22barg, reset by
pressing the red button of the high-pressure switch.
Pump Down Recommendations
If pump down is used, the electrical circuitry should be arranged so that compressor
restart is triggered by demand from thermostat rather than a reset low pressure
switch.
The rotary/scroll compressor built in with a discharge valve to prevent high-pressure backflow into the low side. This
check valve prevents system pressures from equalizing and pump down could be achieved. However, there is potential
short cycling condition:
i. If the low-pressure switch differentiate pressure is too close, the possibility of short cycling will increase. Refer
Table 6 for the recommended settings to limit the short cycling.
ii. If short cycling cannot be avoided for wiring where compressor restart triggered by low pressure switch, using
a 3-minute time delay will limit the cycling of the compressor to an acceptable level.
iii. To eliminate the short cycling during defrost, the activation of compressor shall be triggered by demand from
thermostat.
Table 6: High- and Low-Pressure Switch Settings
Application
Refrigerant
Low Pressure Settings bar(g) (Auto Reset)
High Pressure
Settings bar(g)
(Manual Reset)
Min.
Cut
Out
Factory Default
Pump Down System
(Recommended)
Cut in
Cut
Out
Cut
in
Differential
Cut in
Differential
MT
R404A/R448A/
R449A
1.5
3
1
4
2.5
22
28

T-CU11-OCT22-0 Page 11
Application Guidelines
Figure 7: Piping Diagram for Pump Down System
Suction Accumulator
An accumulator is required if repeated flooded starts could occur, dilute the oil in the compressor causing inadequate
lubrication and bearing wear.
A suction accumulator MUST added at suction line near to compressor for:
i. System with charge exceed compressor limit.
ii. Systems with defrost schemes or transient operations that allow prolonged, uncontrolled liquid return to the
compressor.
Suction accumulator may not be required for system with room thermostat control with pump down (solenoid valve
installed at liquid line), with the condition suction header of sufficient volume is made to prevent liquid migration to the
compressor during off cycle.
Disharge Thermostat
The discharge temperature will rise rapidly if the compressor is running under the overload conditions or lack of
refrigerant conditions.
For scroll compressor, the internal motor protector cannot protect the compressor against all the possible failures.
Thus, it is recommended to install external discharge thermostat located on the discharge line within 100mm (4”) of the
compressor shell with cut out temperature not exceed 1300C. The discharge thermostat should be installed on top side
of the discharge tube and it also important be well insulated.
Crankcase Heaters
The refrigerant is usually gathering in coldest point within the system during OFF cycle and the compressor might
become the right one where most of liquid refrigerant centralized.
Crankcase heater is required when the system charge exceed charge limit and require remain energized during the
compressor off cycles. The initial start in the field is a very critical period for any compressor because all load-bearing
surfaces are new and require a short break-in period to carry high loads under adverse conditions. Thus, the crankcase
heater must be turned on a minimum of 12 hours before first time start, to prevent oil dilution and bearing stress on
initial start-up.
A 35-Watts crankcase heater is recommended for scroll compressor model and should be well attached to the
compressor shell.

T-CU11-OCT22-0 Page 12
Health and Safety
DAIKIN Condensing Unit has to be installed and commissioned by competent
personnel, who are familiar with refrigeration systems and components including all
controls. To avoid potential injury, use care when working around coil surfaces or
sharp edges of metal cabinets. All piping and electrical wiring should be installed in
accordance with all applicable standards and local laws.
General Information
Before Installation
•Ensure the units received are the correct models for the intended application.
•Ensure the refrigerant; electrical supply and maximum working pressure (MWP) are all suitable for the
proposed application.
•Check there is no damage to the units. Any damage should be advised to the supplier immediately.
•Check that the proposed equipment locations are suitable and provide adequate support for the weight of the
units.
Offloading and Lifting
•Whenever a condensing unit is lifted, it should be from the base and, where possible, all packing and
protection is kept in position.
•If lifting equipment is required, ensure that it is suitable, certificated, and that the operatives are qualified to
use it.
•When using a fork-lift or pallet truck to lift the unit, the two support points should be sufficiently apart to give
stability when lifting and suitably placed to distribute the load on the forks.
•If slings are used, care should be taken to ensure that the slings do not crush the casework or coil.
•When lifting by crane, use spreader bars to prevent compressing the top of the equipment.
•Do not drop the unit. Should this inadvertently happen, it should be immediately unpacked and inspected for
damage.
•Use the appropriate spreader bars/lifting sling with the holes and lugs provided.
During Installation and subsequent maintenance
•Installation and maintenance are to be performed only by qualified personnel who are familiar with local
codes and regulations and experienced with this type of equipment.
•Safe working methods are identified, and operatives have suitable Personal Protective Equipment (PPE).
•Ensure the working area has adequate ventilation during brazing procedures.
•The units contain moving machinery and electrical power hazards, which may cause severe injury or death.
Disconnect and shut off power and wait until the rotating blades stop before installation or service of the
equipment.
•Refrigerant release into the atmosphere is illegal. Proper evacuation, recovery, handling, and leak testing
procedures must be observed at all times.
•Units must be grounded to the screw terminal labelled
•No maintenance work should be attempted prior to disconnecting the electrical supply.
•The fan guards must remain always fitted when put under operation.
•Use of the units outside of the design conditions and the application for which the units were intended may be
unsafe and be detrimental to the units, regardless of short term or long-term operation.
•The units are not designed to withstand loads or stresses from other equipment or personnel. Such extraneous
loads or stress may cause failure/leak/injury.
•The installer must fix the unit securely on installation using the M8 bolt holes in the unit feet to prevent
instability from accidental contact or from exposure to the elements (example: wind).
•The units are not designed to operate with any restrictions such as heavy snowfall around them. Additional
measures (such as shielding of the units) shall be implemented as required.

T-CU11-OCT22-0 Page 13
Installation
Unit location
To achieve maximum cooling capacity, the installation location for the condensing unit should be carefully selected.
•Install the condensing unit in such a way so that hot air ejected by the condensing unit cannot be drawn in
again (short circuit of hot discharge air). Allow sufficient space for maintenance around the unit.
•Ensure that there is no obstruction to air flow into or out of the unit. Remove obstacles which block air intake
or discharge.
•The location must be well ventilated, so the condenser fan could draw in and distribute plenty of air thus
lowering the condensing temperature and power consumption.
•Air leaving the condenser should avoid facing prevailing wind, which impede air flow and thus causing high
condensing temperature.
•To optimize the unit running conditions, the condenser coil must be cleaned at regular intervals.
•The unit must be level in all directions.
•It is recommended to install the unit on rubber grommet or vibration dampers.
•Wall mounting on brackets is only suitable for models with single condenser fan.
Special attention should be given if unit installed near to the sea as this can reduce unit
lifespan due to corrosion of metal parts.
Installation clearances
•The installation location should allow sufficient space for air flow and maintenance around the unit.
✓
✓
X
X

T-CU11-OCT22-0 Page 14
Installation
Field Piping
Pipe sizing should only be determined by qualified personnel. Correct line sizing will
minimize the pressure drop and maintain sufficient gas velocity for proper oil return.
All applicable standards must be observed in the installation of refrigerant piping.
To ensure satisfactory operation and performance, the following points should be noted:
•Pipework routes must be as simple and as short as possible.
•Avoid low points on pipework where oil can accumulate.
•Suction gas velocity must be sufficient to ensure good oil return.
•Use only clean, dehydrated refrigeration grade copper tube with long radius bends.
•Avoid flare type connections and take great care when brazing. Use only silver alloy rods.
•Run braze without over filling to ensure there is no leakage into the tube.
•To prevent oxidation, blow oxygen free nitrogen through pipework when brazing.
•Install insulation on all suction lines and on all pipes penetrating walls or passing through hot areas.
•Adequately support all pipe work at a maximum of 2meter intervals.
•Where the condensing unit is situated below the indoor unit (cold room evaporator / display case), the height
difference between the two units should be no more than 6meter.
•In vertical pipework, the use of U-trap and double suction risers is often required. These suction risers must
always be fitted with a U-trap at the bottom and a P-trap at the top and never be higher than 4m unless a
second U-trap system is fitted.
•Additional oil may be required if piping length exceeds 25m or multiple oil traps are fitted. Check the oil level
closely during commissioning and add oil as necessary. Add oil in small amounts. Do not overfill the
compressor!
•Suction pipework should slope gently back towards the unit to assist oil return to the compressor. A fall of
approximately 2 cm per meter of pipework is acceptable.
•Liquid lines should be sized to ensure a full supply of liquid refrigerant to the expansion device. Careful
attention should be paid for sizing of liquid lines on large risers (maximum rise 6m).
•In some circumstances, a suction accumulator (not supplied) may be required. It offers protection against
refrigerant flood back during operation and against off-cycle migration by adding internal free volume to the
low side of the system.
•Tests must be conducted to ensure the amount of off-cycle migration to the compressor does not exceed the
compressor’s charge limit.
•An MOP expansion valve is recommended for all low temperature installations.
•The system should be installed to utilize a pump down configuration.
•Maximum recommended pipe length is 25m for rotary unit LRMYS0180/250AXY1; 50m for scroll unit
LRMSS0400/500/600FXY1 from the closest indoors.
System Cleanliness
The presence of non-condensable substances and contaminants such as metal shavings, solder, and flux in the system,
have a negative impact on compressor service life. Contaminants which is small enough to pass through the mesh
screen could cause considerable damage within bearing assembly. The use pf highly hygroscopic PVE oil in the
compressor requires that the oil be exposed to the atmosphere just as little as possible.
During installation, circuit contamination can be caused by:
•Brazing & Welding Oxides
•Filings & Particles from de-burring pipework
•Brazing Flux
•Moisture & Air
One of the main factors affecting equipment reliability and compressor service life is
refrigeration circuit contamination.

T-CU11-OCT22-0 Page 15
Installation
Pressure Testing
The condensing units are pressure tested in the factory prior to dispatch. All units come with a holding charge of oxygen
free nitrogen. Remove the holding charge indication tag which is tied to service valve before installation.
Once the pipework installation is complete, it should be pressure tested for leaks prior to evacuation.
A pressure leak test should be carried out using oxygen free nitrogen (OFN). A calibrated nitrogen pressure regulator
must always be used. Before starting any pressure testing, ensure the area surrounding the system is safe, inform
relevant personnel and fit warning signs indicating high pressure testing. Also, use correct PPE as required.
Leak detection must be carried out using oxygen free nitrogen (OFN), or a mixture of
nitrogen and refrigerant or nitrogen and helium. Never use other gasses such as
oxygen, dry air or acetylene as these may form an inflammable mixture.
Always pressurize the system on high pressure side first then only low-pressure side, preferably in stages up to the
maximum required pressure. Never exceed maximum test pressures shown in Table 7. Failure to obey the limit will
cause premature failure on the pressure safety device.
Listen for any possible leaks and check all joints with bubble spray. If any leaks are discovered, release pressure slowly
from both high pressure and low-pressure side until empty, repair leak and then restart pressure testing procedure.
Never attempt to repair a leak on a pressurized system.
A strength test should also be incorporated (to installed pipework only) according to applicable standards.
Once testing has been completed satisfactorily, release the pressure from the system gradually and safely to external
atmosphere.
Table 7: Maximum Test Pressures
High Side, barG/ psig
Low Side, barG/psig
28/405
19/275
Evacuation
Moisture prevents proper functioning of the compressor and the refrigeration system.
Ensure that a good quality vacuum pump is used to pull a minimum vacuum of 250
microns (0.25 torr) measured at refrigeration system, and not at the vacuum pump
gauge.
Once pressure testing has been completed, the system can now be evacuated to remove air and any moisture from the
piping. It is recommended to evacuate on both high- and low-pressure side to achieve fast and uniform vacuum in the
entire system. This can be done as follows:
•Ensure any nitrogen charge is safely released from the system.
•Connect a gauge manifold to the connections on the service valves on the condensing unit.
•Connect a vacuum pump and vacuum gauge to the system.
•Ensure all gauge manifold and service valves are open as required.
•Evacuate the system until vacuum is below 250 microns (0.25 torr).
Note: A triple evacuation procedure is recommended for all new systems or where moisture is
suspected.
Once the system is isolated and the vacuum pump is switched off, any rise in pressure indicates that either there may
be a leak in the system or moisture is still present. In this case, recheck the system for leaks, repair as necessary, and
then restart the evacuation procedure. Once completed satisfactorily, the vacuum pump and vacuum gauge can be
removed.

T-CU11-OCT22-0 Page 16
Installation
System Charging
Once system evacuation has been completed, the system could be charged with the approved refrigerant. Refrigerant
must be charged with liquid on the high-pressure side to the extent possible, with the compressor in OFF condition and
service valves must be closed. The service port on the receiver outlet rotolock valve (liquid line) can be used for initial
charge.
If additional charge is needed, it should be added as liquid, in a controlled manner to the low side of the system with all
service valves turn to OPEN position and compressor operating.
For the adjustment of refrigerant charge until the installation reaching a level of stable nominal working condition,
slowly throttling liquid in through schrader valve on the suction service valve. Charge system until reaching suction
superheat 6~12K at desired evaporating temperature. Suction superheat, suction, and condensing pressures
(temperatures) should be monitored. During optimizing charging, ensure oil sight glass doesn’t start foaming.
A proper refrigerant charge should secure stable condition at minimum and maximum heat load within the limits of the
condensing unit’s application envelope.
•Minimum heat load conditions, which occurred during winter. Condenser should not be flooded by liquid
refrigerant, receiver and liquid line should be able to contain remaining charge at this condition.
•Maximum heat load conditions, which occurred during summer. All evaporators are working with maximum
air/liquid flow via evaporators and refrigerant charge should be enough to feed to all evaporators.
Refrigerant charge by judging the liquid sight glass does not guarantee as 100% correct
way.
System maximum charge is approximated = (Receiver Volume + Internal volume of Liquid Line) * 0.9
When the compressor operates under stabilized conditions, the oil level must be visible in the sight glass. Foam filling
the oil sight glass indicates presence of large concentration of liquid to the compressor.
No additional oil is required for installation with good oil returns, line runs up to 25m. Additional oil might be required if
lines exceeded 25m, with minimum oil level must not lower than ¼ of sight glass. Top-up the oil while compressor is
idle, via suction schrader connector with a suitable pump.
Ensure an adequate liquid charge has been introduced to the high side of the system before starting to ensure a
minimum operating pressure on the suction side of 0.5 bar is maintained, otherwise overheating of the scroll and rotary
and subsequent damage may occur.
Never install a system in the field and leave it unattended with no charge, or with the service valves closed without
securely locking out the system. This will prevent unauthorized personnel from accidentally operating the system and
potentially running the compressor by operating the compressor without charge.
Table 8: Internal Volume of Liquid Line
Liquid Line (Volume)
OD (inch) OD (mm) ID (ID)
L/m
3/8 9.5 7.9 0.05
1/2 12.7 10.7 0.09
5/8 15.9 13.5 0.14
3/4 19.1 16.7 0.22
Liquid Line (Dimension)

T-CU11-OCT22-0 Page 17
Installation
Electrical
The mains 3phase electrical supply to the condensing unit MUST fitted via a suitable
motor rated circuit breaker or fuse, to provide short circuit protection to the
condensing unit. A mains isolator MUST also be fitted to all condensing units unless site
conditions or regulations dictate differently.
Daikin condensing units require a 400 Volt / 3 Phase / 50Hz supply, both of which must include a Neutral and an Earth.
These systems are not suitable for any other supply voltages (other than specified in Table 5 and are not suitable for
60Hz supplies).
Table below is just a guideline for power supply cable sizes to the condensing unit for maximum length up to 30m.
Installer might specify cable size different from this guideline, depending on the wire material and length, system
design, ambient temperature, etc.
Table 9: Power Supply Wiring Sizes
Model
Cable size, mm2(from network to unit)
Maximum Fuse Rating (A)
LRMYS0180AXY1
2.5
15
LRMYS0250AXY1
2.5
15
LRMSS0400FXY1
4.0
20
LRMSS0500FXY1
4.0
20
LRMSS0600FXY1
4.0
25
Cables to the condensing unit should wherever possible be routed through the designated access (wire bush/valve
cover) on the rear-right panel and the termination at control panel should be stress relieved by tie the incoming supply
cable with the provided push releasable tie.
Ensure an adequate liquid charge has been introduced to the high side of the system
before starting to ensure a minimum operating pressure on the suction side of 0.5 bar
is maintained, otherwise overheating of the scroll and rotary and subsequent damage
may occur. Refrigerant blend must be charged in liquid form to avoid change of
chemical properties.
Never start the compressor under vacuum (do not operate the compressor with the
low-pressure cut-out bypassing), as this will cause the rotating part to overheat very
quickly causing premature failure.
Do not use a megohmmeter nor apply power to the compressor while the system
under vacuum as this may cause internal damage to the compressor.