Panasonic 4CW056MA01 Instructions for use

Ver.202203
Horizontal Scroll Compressors
Application Manual
Panasonic Appliances Compressor (Dalian) Co., Ltd.

TABLE OF CONTENTS
Safety Instructions ............................................................................................................................................1
1.0 Structure and Operating Characteristics .....................................................................................................2
1.1 Key Components ....................................................................................................................................2
1.2 Scroll Compressor Operating Characteristics .........................................................................................2
1.3 Compressor Design Pressure ..................................................................................................................3
1.4 Refrigerant Oil........................................................................................................................................3
1.5 Compressor Models and Motor Type .....................................................................................................4
2.0 Refrigerating Circuit Design Considerations..............................................................................................5
2.1 Condensing Pressure and Evaporating Pressure .....................................................................................5
2.2 Suction Temperature ...............................................................................................................................5
2.3 Discharge Temperature ...........................................................................................................................6
2.4 Sub Cooling Degree ...............................................................................................................................6
2.5 Liquid refrigerant flood back..................................................................................................................6
2.6 Suction Accumulator ..............................................................................................................................6
2.7 Discharge Line Check Valve................................................................................................................... 7
2.8 Suction Line Strainer .............................................................................................................................. 7
2.9 Dryer.......................................................................................................................................................7
2.10 Oil separator .........................................................................................................................................7
2.11 System Charge Limit ............................................................................................................................8
2.12 Oil level of the compressor...................................................................................................................8
2.13 Operating Envelope ..............................................................................................................................8
2.14 Pipe surface stress.................................................................................................................................9
2.15 Allowable incline.................................................................................................................................. 9
2.16 Vibration ...............................................................................................................................................9
3.0 Electrical Parts and Controller Design Considerations............................................................................. 10
3.1 Selection of Electrical Wiring...............................................................................................................10
3.2 Selection of Inverter Driver .................................................................................................................. 12
3.3 Starting and maximum current of compressor...................................................................................... 12
3.4 Starting of compressor.......................................................................................................................... 12
3.5 Stopping of compressor ........................................................................................................................ 13
3.6 Rate of revolution speed change........................................................................................................... 13
3.7 Defrost operation .................................................................................................................................. 13
3.8 Cautions of transition phase to lower speed operation .........................................................................13
3.9 Caution for continuous low speed/high speed operation ...................................................................... 13

1
3.10 Avoid low compression ratio conditions............................................................................................. 14
3.11 On/off cycle ........................................................................................................................................14
3.12 Rotation direction of compressor........................................................................................................ 14
3.13 Deep vacuum Operation ..................................................................................................................... 14
3.14 Caution on pump down operation....................................................................................................... 15
3.15 Protection Devices Required ..............................................................................................................15
4. 0 Assembly and Manufacturing Process Considerations ............................................................................17
4.1 Removing Rubber Plug ........................................................................................................................ 17
4.2 Compressor Mounting .......................................................................................................................... 17
4.3 Residual Moisture................................................................................................................................. 17
4.4 Tube Brazing ........................................................................................................................................18
4.5 Leakage Test ......................................................................................................................................... 20
4.6 Evacuation ............................................................................................................................................ 20
4.7 Refrigerant Charge ............................................................................................................................... 20
4.8 Wiring Connections .............................................................................................................................. 20
4.9 Terminal cover and clip ........................................................................................................................ 21
4.10 Preliminary Running........................................................................................................................... 22
4.11 Start Compressor with Balanced Pressure .......................................................................................... 22
4.12 Servicing Scroll Compressors............................................................................................................. 22
4.13 Other Precautions ............................................................................................................................... 24
5. 0 Troubleshooting....................................................................................................................................... 25

1
Safety Instructions
Panasonic scroll compressor meets strict safety and operating standards. As the installer or service
person, it is an important part of your job to read this instruction carefully before beginning.
ELECTRICAL
SHOCK HAZARD
●Make sure the unit utilize grounded connection.
●Disconnect all input power before servicing.
●Install the cover of terminal box before energized.
EXPLOSION OR
FIRE HAZARD
●Remove the refrigerant before brazing operation.
●Do not compress air or energize the compressor under vacuumed
condition.
●Use only approved refrigerants and refrigeration oil.
PERSONAL
INJURY
● Personal safety equipment must be used.
BURN HAZARD
●Do not touch the compressor when it is running or stopping until it
has cooled down.
The detailed safety request in <Safety Request on the Use of Compressor> must be followed.

2
1.0 Structure and Operating Characteristics
1.1 Key Components
Panasonic C-SW series scroll compressors are horizontal type hermetic compressors and designed for
mobile air conditioning applications.
The pressure inside of shell is high pressure (discharge pressure). Suction refrigerant gas enters into
compression chamber directly and the motor is cooled by discharge gas. The motor is rigidly attached to the
shell; Crankshaft is supported by main frame and sub-frame which are welded to the shell. Pump assembly
consists of fixed scroll and orbiting scroll and Oldham ring. Orbiting scroll rotates on the surface of the main
frame.
Figure 1-1 Horizontal Scroll Compressor Components
See a cutaway view of C-SW series compressor in Figure1-1.
1.2 Scroll Compressor Operating Characteristics
Panasonic C-SW series scroll compressors are designed with fixed eccentric and floating orbit scroll sealing,
resulting in low sound level and minimal gas leakage and therefore excellent efficiency.
The Figure 1-2 below describes the scroll compression process:
First orbit; SUCTION gas enters at the perimeter of the scroll elements and is sealed as the scrolls rotate
approximately one revolution.
Second orbit; During the COMPRESSION process, the gas is further compressed towards the center of the
scroll elements to an intermediate pressure.
Third orbit; In the DISCHARGE orbit, the gas is further compressed to discharge pressure and then exits at
the center through the discharge port.
With a three step simultaneous process of suction, compression and discharge and two gas pockets in each
step that are 180 degrees apart, the compression process is balanced and very smooth, resulting in high
efficiency, low sound/vibration and excellent reliability.

3
First Orbit: SUCTION
Second Orbit: COMPRESSION
Third Orbit: DISCHARGE
Figure 1-2 Compression Process
1.3 Compressor Design Pressure
The compressor’s design pressure is shown in Table 1-1. The operating pressure in the system shall be lower
than compressor design pressure.
Table 1-1 Compressor Design Pressure
Refrigerant
High Pressure Side MPa(G)/psig
R407C/R134a/R513A
3.3/479
R410A
4.15/602
1.4 Refrigerant Oil
To improve the reliability, the specified designed premium quality refrigerant oil is used in the compressor.
The refrigerant oil containing foam suppressor has the excellent thermal stability and high durability for
overload conditions.
1.4.1 Oil Type
Each type of refrigerant oil is specially designed for certain types of refrigerant and operating conditions, if
additional oil charge is added in the field, Only specified oil should be used.
Table 1-2 Type of Oil
Refrigerant
R407C
R410A
R134a
R513A
Oil Model
FV68S
Oil Type
Polyvinyl Ether（PVE）
1.4.2 Functions of Refrigerant Oil
1) Lubricate the moving parts to reduce mechanical friction.

4
2) Absorb the heat generated by mechanical friction.
3) Prevent refrigerant leakage at sealing surface.
4) Rust proof.
1.5 Compressor Models and Motor Type
Panasonic C-SW series horizontal scroll compressors are designed for variable speed operation. A three
phase, Induction type motor or a brushless permanent magnet motor is applied in this series.
The inverter compressor shall only be connected to specific inverter driver produced for this compressor.
Voltage applied to the compressor terminal shall be within the range mentioned in the compressor
specification.
Additionally, AC power voltage (1φ100V,200V,220V,3φ200V,380V etc.) shall never be supplied to the
compressor terminal of DC Inverter models as the DC brushless motor in the compressor will be
demagnetized.
The model list and motor type are shown in Table 1-3.
Table 1-3 Compressor Models and Motor Type
AC Inverter COMPRESSOR (with Induction motor)
ARI Condition
Ref.
HP
New Model
Former model
Disp.
Input
Voltage
Capacity kW
IP
Rating
Comment
cm3/rev
60rps
90rps
R407C
5
4CW056MA01
C-SWS180H01C
55.7
200V
12.9
18.0
IP67
Annular legs
7
4CW074NA01
C-SWS225H00C
74.4
400V
16.5
23.0
IP67
Annular legs
7
4CW074MA01
C-SWS225H01C
74.4
200V
16.5
23.0
IP67
Annular legs
7
4CW074MA11
C-SWS225H01F
74.4
200V
16.5
23.0
IP67
Annular legs big
hole spacing
10
T-SWS110H00A
——
110.0
400V
24.2
33.5
IP67
Remarks: R407C models are applicable to R134a and R513A.
DC Inverter COMPRESSOR (with BLDC motor)
ARI Condition
Ref.
HP
New Model
Former model
Disp.
Input
Voltage
Capacity kW
IP
Rating
Comment
cm3/rev
60rps
90rps
R410A
6
5CW042ZA11
——
42.3
400V
13.9
20.5
IP67
4 Poles Motor
Annular legs
10
5CW067ZA01
C-SWP330H02C
66.8
400V
22.1
33.2
IP67
4 Poles Motor
Annular legs
10
5CW067ZB01
——
66.8
400V
22.4
33.6
IP67
6 Poles Motor
11
5CW073ZA02
——
73.4
400V
24.3
36.0
IP67
6 Poles Motor EVI
12
5CW081ZA01
——
80.5
400V
26.0
40.0
IP67
6 Poles Motor

5
2.0 Refrigerating Circuit Design Considerations
2.1 Condensing Pressure and Evaporating Pressure
The recommended condensing pressure and evaporating pressure for R407C systems at standard conditions
are shown in the table 2-1:
Table 2-1 Recommended condensing and evaporating pressure
Pressure
Cooling
High side MPa(G)
1.85~1.90
Low side MPa(G)
0.45~0.5
It is necessary to adjust the system if the high side pressure or low side pressure has relatively large deviation
from the recommended pressure. Some reasons are listed in Table 2-2 for pressure deviation.
Table 2-2 Reasons of pressure deviation
Item
Low Side Pressure
Lower
Middle
Higher
High Side
Pressure
Higher
<a>
--
<c>
Same
--
OK
--
Lower
<d>
--
<b>
Note: Higher: The tested pressure is higher than recommended pressure.
Lower: The tested pressure is lower than recommended pressure.
Same:The tested pressure is approximately same as recommended pressure.
<a> Too big of compressor size
<b> Too small of compressor size
<c> Too high of dry bulb temperature in the condenser side
Excessive refrigerant has charged in the system
Uneven refrigerant distribution in the circuits of condenser
Too low rotation speed of condenser fan
<d> Too low wet bulb temperature in the evaporator side
Uneven refrigerant distribution in the circuits of evaporator
Too low rotation speed of evaporator fan
Lack of refrigerant charge in the system
Too big superheating degree caused by improper size expansive valve or capillary
2.2 Suction Temperature
The suction temperature shall be higher than evaporator outlet temperature. (If there is a specific description
in the compressor specification regarding to superheat, follow the contents.)
In order to prevent compressor from flooded back operation, a minimum suction superheating degree of 5K
[10F] should always be maintained.

6
It is necessary to keep the proper superheating degree since too high superheating will cause the high
discharge temperature and the decrease of refrigerant mass flow rate.
2.3 Discharge Temperature
Panasonic C-SW series compressor is with high pressure shell structure. Motor is cooled down by discharge
gas. The discharge temperature shall be controlled lower than the limitation in the compressor specification.
The recommended discharge temperature is not higher than 95℃ under standard conditions. And under
overload condition, shall not exceed 115℃. Discharge temperature is measured in the copper pipe on the
end cap of compressor.
2.4 Sub Cooling Degree
The sufficient sub cooling degree can not only increase the cooling and heating capacity but also can keep
the inlet of expansion valve or capillary full of liquid state refrigerant.
On the contrary, the insufficient sub cooling will cause flash gas occurring at the inlet of expansion valve,
which will result in capacity reduction and increasing vibration, noise.
2.5 Liquid refrigerant flood back
Liquid refrigerant flood back can cause great influence to the reliability of compressor. When liquid
compression, knocking noise, current surge, or undesirable vibration etc. occurs, implement the following
countermeasures to prevent liquid refrigerant flood back.
1) Add suction accumulator
2) Decrease refrigerant charge amount
3) Change the operation mode
4) Install an internal heat exchanger.
Observe with the compressor with sight glasses supplied by Panasonic, and consult your account
representative for the result.
2.6 Suction Accumulator
A suction accumulator is necessary to prevent the uncontrolled liquid flooding back.
The proper size suction accumulator can:
1) Prevent liquid refrigerant migrating to compressor
2) Prevent liquid refrigerant being sucked into compressor.
The suction accumulator used in the system should at least meet the requirements as follow:
1) The size of the accumulator must be greater than 60% total refrigerant volume.
2) To ensure well oil return, a φ1.5~2.3 mm orifice is necessary in the suction accumulator.
3) Filter mesh must be used to prevent orifice being blocked when orifice is smaller than φ2.0 mm
See a cutaway view of suction accumulator in Figure2-1

7
Figure 2-1 Suction Accumulator
2.7 Discharge Line Check Valve
Compared with vertical type compressor, the motor of horizontal type compressor is more inclined to be
immersed by refrigerant, which will result in lower insulation resistance value and higher leakage current
readings. This is not a safety issue and the insulation resistance value will be back to normal after a short
period operation to redistribute the refrigerant through the system.
In order to prevent refrigerant migration to compressor during off cycle, a check valve should be installed in
discharge line. The leak rate of check valve should be qualified by testing.
2.8 Suction Line Strainer
To prevent foreign particles coming in the compressor inside, it shall install the strainer with screen on the
way to suction line piping. The strainer shall be more than 30mm in diameter and a screen mesh size of 100.
In case that the suction line has an accumulator with screen, the strainer will not be required.
2.9 Dryer
A suitable sized filter dryer should be used to ensure the low degree residual moisture level in the refrigerating
circuit, the molecular sieves type is recommended.
2.10 Oil separator
An oil separator is recommended to separate a major part of oil from compressor discharge gas and return it
directly to compressor crankcase. The functions of oil separator including:
1) Improve the oil management and reliability of compressor;
2) For inverter compressors, the oil flow rate increases when rotation speed is high, more oil leaving
compressor and lower the efficiency of heat exchanger, which will result in lower cooling capacity of
system. In this case the use of oil separator will give a notable improvement for system performance；
3) Panasonic horizontal scroll compressors are designed with high pressure shell, the oil return pipe
should go through capillary tube and connect with suction tube (before the suction accumulator) ；
4) A centrifugal type oil separator is recommended which has a stable oil separation rate in variable
refrigerant flow rate conditions.

8
2.11 System Charge Limit
The proper system charge can keep the system parameters in the normal level, such as cooling and heating
capacity, sub cooling degree, suction and discharge temperature, compressor’s sump temperature, etc.
The refrigerant charge and refrigerant oil in the system should keep the ratio as follow:
Oil (kg)/ Refrigerant (kg)≥0.35
Note: Specific gravity of the Oil using in R407C/R410A/R134a series compressors is 0.94
If oil/refrigerant ratio is lower than 0.35, it will cause dilution of oil and lack of lubrication inside of compressor.
So please inform us before the system being tested under 0.35>oil(kg)/refrigerant (kg) ≥0.3 condition,
some detailed advices will be given about oil level in compressor .
As a general requirement, oil (kg)/refrigerant (kg) >0.3 shall be kept.
2.12 Oil level of the compressor
The minimum oil level in the compressor shall comply with the requirements of the compressor specification
to ensure the compressor reliability. When the oil is foamed, do not consider the foaming portion as oil level.
Low oil level will cause lack of lubrication to rotating parts and seriously affect the compressor reliability.
Observe the oil level with the compressor with sight glass supplied by Panasonic, and consult your account
representative for the result.
<<Example showed the oil level to keep>>
Figure 2-2
2.13 Operating Envelope
The operating envelopes of inverter compressors depend on the running speed. The envelope limitations are
varied for different speed range, which are defined by mainly considering the limits of discharge temperature,
compression ratio, lubrication and power limitation.
The operation of compressor shall be under the Operation Envelope that described in the compressor
specification at all conditions. However, when operating conditions exceed the range described in the
specification during transitional period such as during start up and defrosting, it may be judged by testing or
checking the operating data.
· level A : the lowest oil level during transition
operation; (Distance to the Bottom 10mm)
· level B : the lowest oil level during stable
operation; (Distance to the Bottom 38mm)
· level C : the highest oil level during stable
operation; (Distance to the Top 15mm)

9
2.14 Pipe surface stress
The stress of pipes connecting the compressor and other parts of the refrigeration systems, shall not be more
than 12.26MPa when the compressor is operating, and shall not be more than 34.32MPa during 'start - stop'.
2.15 Allowable incline
The allowable incline shall not be more than 10°during operation.
2.16 Vibration
Since C-SW series compressors are designed with high back pressure shell, the oil level inside of crankcase
is more stable during operation. The installation direction of the compressor could be perpendicular or parallel
to the running direction of the vehicle.
Initial operation test for the system at full range of speed must be conducted to prevent vibration transmission
into any lines attached to the unit.

10
3.0 Electrical Parts and Controller Design Considerations
3.1 Selection of Electrical Wiring
Voltage drop may occur due to the large current draw during compressor starting. The starting failure will
occur if the starting voltage is under the range of compressor specifications. So it is necessary to select the
proper size of electrical wire.
3.1.1 Voltage Drop
See Figure 3-1 for the explanation of voltage drop.
a) Set Voltage:
The voltage applied to compressor terminals before compressor is started.
b) Starting Voltage:
The voltage applied to compressor terminals when compressor is being started. When compressor
is starting, the big starting current will cause the drop of voltage. It will be very hard to start
compressor if the starting voltage is too low.
c) Running Voltage:
The line voltage applied to compressor terminals when compressor is running stably. This running
voltage is a little lower than set voltage.
The big voltage drop happens in compressor starting process, it will cause the failure of starting if
the starting voltage is lower than 85% of rated voltage.
Figure 3-1 Voltage Drop During Compressor Starting
Voltage
Set voltage
Starting voltage
Voltage drop
Running voltage

11
3.1.2 Selection of Electrical Wiring
The recommended wiring size is shown in the table 3-1.
Type of Unit
Window & Commercial Type Unit
Split Type (Separate Type)
Table 3-1 SELECTION OF ELECTRICAL WIRING
Starting
current (A)
Size of electrical wire（mm2）
Remark ① or Remark ①+②（heat-resistance Temperature:
60°C[140°F]: min.）
Remark③（heat-
resistance
Temperature:
120°C[248°F]
min.）
5m max.
10m max.
15m max.
20m max.
30m max.
50m max.
1m max.
20max.
2.0
2.0
2.0
3.5
5.5
8.0
2.0
30max.
↑
↑
3.5
5.5
↑
14.0
↑
40max.
↑
3.5
5.5
↑
8.0
↑
↑
50max.
↑
↑
↑
8.0
14.0
22.0
↑
60max.
↑
5.5
↑
↑
↑
↑
↑
70max.
3.5
↑
8.0
14.0
↑
↑
3.5
80max.
↑
↑
↑
↑
22.0
30.0
↑
90max.
↑
↑
14.0
↑
↑
↑
↑
100max.
↑
8.0
↑
↑
↑
38.0
↑
110max.
↑
↑
↑
↑
↑
↑
↑
120max.
5.5
↑
↑
22.0
30.0
↑
↑
140max.
↑
14.0
↑
↑
↑
50.0
5.5
160max.
↑
↑
22.0
↑
↑
↑
↑
180max.
↑
↑
↑
↑
38.0
60.0
8.0
200max.
8.0
↑
↑
30.0
↑
↑
↑
220max.
↑
↑
↑
↑
50.0
80.0
↑
240max.
↑
↑
↑
↑
↑
↑
14.0
CAUTION OF GROUNDING:
The internal motor protector cannot protect the compressor against all possible failures.
Please be sure that the system utilizes the grounding connection when is installed in the field.
①
Power
terminal
compresso
indoor
③
①
②
③
①
Power
source
terminal
plate
compressor
indoor
③
compressor
indoor
Power
source
terminal
plate

12
3.2 Selection of Inverter Driver
The function of inverter driver is to power the compressor, control the compressor running speed, protect
compressor from abnormal situations and communicate with master controller.
Make sure to choose a suitable quality inverter driver which have been passing performance test with
compressor.
A third-party driver can be used. To get the best system efficiency and reliability, consult your account
representative to verify the match of driver setting and BLDC motor parameters.
The following factors should be considered when select a driver:
1) Driver size should match with maximum current of compressor;
2) Driver should have compressor protection functions including discharge temperature protection, over-
current protection, reverse phase protection, loss of phase protection etc.
3) Driver should have function to skip some specific frequency range to avoid piping resonance.
4) Frequency limit control
When the output current of driver increases to close to the over-current protection value, the
compressor frequency should be reduced, and the compressor should be restricted from high-
frequency operation to avoid frequent fluctuations.
Compressor smoothly operation depends on a certain voltage input; the higher the speed, the higher
the voltage required. During the operation, when the output voltage of the inverter is low, it should
reduce the frequency and limit the compressor from high frequency operation to avoid stall and
shutdown of compressor.
5) Electromagnetic noise may occur due to inverter characteristics. To adjust carrier frequency can reduce
electromagnetic noise level
3.3 Starting and maximum current of compressor
Starting current and maximum current shall be within the range mentioned in the compressor specification.
In the case of inverter compressor, if the current is over the limitation, DC brushless motor will be
demagnetized and compressor will not be started.
The over current protection must be set on the inverter driver. The protection value setting is subject to
compressor’s demagnetization current. Once an over current occurs, the driver should shut down the
compressor for more than 3minutes from next start up.
3.4 Starting of compressor
In the case of inverter compressor, operation at rather low frequency after starting is necessary to avoid
insufficient lubrication due to low oil level.
Figure 3-2 Starting
1min
50~70 rps
Time
f(rps)
Rotation
speed

13
After the rotation speed attained at 50~70rps, it is necessary to keep the speed for one minute. Because it is
to prevent the oil lack to sliding portion by oil level down at compressor-start. To check oil return, perform a
test using a sight glass compressor supplied by us. Similar action also applies to restart operations after
defrost cycle.
3.5 Stopping of compressor
When compressor needs to stop in high running speed, it is recommended to decrease the speed before
compressor shutting off, in order to low down the impact to inverter, and avoid too much oil left in the system.
In case of emergency stop, direct cut off of power supply can be done.
Figure 3-3 Stopping
3.6 Rate of revolution speed change
The rate of operation speed change of the inverter compressor can affect the reliability of compressor.
The rate of revolution speed change shall be within 1~3rps. This is to prevent the damage of sliding portion
of bearing parts by rapid change of rotation.
The rate of speed change shall be determined after confirmation of compressor oil level, liquid back, and
reliability. If there is a specific description in the compressor specification, follow the contents.
3.7 Defrost operation
Inverter compressors shall operate at low speed right before the start of defrost cycle and right before the
end of defrost cycle. This will enable the oil to be retained in the compressor. To check oil return, perform a
test using a sight glass compressor supplied by us.
3.8 Cautions of transition phase to lower speed operation
For inverter compressors, to prevent plunge of refrigeration capacity due to separation of fixed scroll and orbit
scroll, pay attention to sharp drop of pressure difference and liquid back, when transferring to low speed
operation of below1500 min-1.
If there is a specific description in the compressor specification, follow the contents.
3.9 Caution for continuous low speed/high speed operation
When the inverter scroll compressor be operated at low speed or high speed conditions as described below,
it is necessary to adjust the speed of inverter compressor to 50-60rps for more than 3minutes operation, then
back to normal speed control logic according to cooling load.
90rps
Time
f(rps)

14
1) Compressor speed ≤30rps , for more than 1 hour continuous operation;
2) 30rps< compressor speed ≤40rps, for more than 4 hours continuous operation；
3) Compressor speed ≥75rps , for more than 40 minutes continuous operation；
This recommendation is to keep the safe oil level inside of compressor and make sure the sufficient lubrication,
3.10 Avoid low compression ratio conditions
Compressor internal oil supply depends on internal oil pump and the rotation speed, do not run the
compressor in the low compression ratio conditions with lower speed (especially 30~39rps).
If the cooling operation is required at lower ambient temperature condition, system should be designed to
decrease the fan speed of condenser, and increase the compressor running speed, to maintain the proper
compression ratio of compressor.
Figure 3-4
3.11 On/off cycle
The on/off cycle of compressor shall not be more than 6 cycles per hour.
The compressor should be operated continuously at least for 5 minutes after being turned on. Allow a
minimum of 3 minutes shut-off time before restarting. Or restart the compressor after the pressure difference
between high side and low side balances.
3.12 Rotation direction of compressor
Wiring shall be connected in accordance with the wiring diagram mentioned in the compressor specification.
Otherwise the compressor will run into reverse operation and breakdown. Never do this.
3.13 Deep vacuum Operation
Scroll compressors should never be used to evacuate an air-conditioning or refrigeration system. As a high
volumetric efficiency machine, compressor will achieve extremely low vacuums when the suction side is
restricted, this may cause internal arcing at the electric terminal and the damage of compressor.

15
3.14 Caution on pump down operation
At the pump-down operation, the rotation speed of compressor shall be lower than 60rps.
The operation time shall not exceed a limit of 10minutes.
3.15 Protection Devices Required
For air-conditioning or heat pump unit, the following protective devices should be installed:
1) Reverse Phase Protector
Scroll compressor will only compress in one rotational direction. This is very important for three phase
compressors since three-phase induction motor will run in either rotational direction equally depending on
phasing of the power. Reverse rotation will result in excessive noise, and no suction / discharge pressure
differential appears as well as no cooling effect in the suction line.
For three phase systems, mechanic device or reverse rotation module in the system control unit is necessary
in preventing three phases compressor from running in the reverse rotational direction.
2) Discharge Gas Thermostat
The discharge temperature will rise rapidly if the compressor is running under the overload conditions or lack
of refrigerant conditions.
The maximum discharge temperature should be maintained by a discharge thermostat.
For C-SW series, a copper well pipe is installed on the end cap of compressor, which is filled with heat
conducting silicon to improve the heat transfer effect. The discharge thermostat shall be inserted into this well
pipe and the tripping point must not exceed 115℃.
Figure 3-5 Discharge Thermostat Installation
3) Low Pressure Switch
Panasonic scroll compressors require a low-pressure switch to protect against loss of refrigerant conditions.
The recommended settings are listed in Table 3-2.

16
Table 3-2 Low Pressure Switch Setting
Refrigerant
Cut-Off setting
R407C
7.3 psig (0.05MPa G)
R410A
22 psig (0.15MPa G)
R134a
4.3 psig (0.03MPa G)
The temperature in the scroll set and motor will rise rapidly due to loss of refrigerant charge. The low-pressure
switch will react upon low pressure occurs in the system. Sometimes, the low-pressure switch will react in
priority to the action of discharge thermostat or motor protector when the large amount of refrigerant leaks in
the short time.
Do not operate the compressor in exceeding 30 seconds when running under 0.03MPa (G).
4) Crankcase Heater
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.
After a long OFF cycle, the refrigerant vapor may condense into compressor oil, when compressor restarts.
the liquid refrigerant mixed with oil in foam status will lead to lubrication failures. The liquid refrigerant
migration is also the cause of low insulation resistance of compressor.
Panasonic recommends crankcase heaters should be used for the system with high refrigerant charge
volume. The crankcase heater of suitable power should remain the temperature of compressor bottom shell
11K higher than ambient temperature or reduce the oil level to specified level after 5 hours energizing.
The crankcase heater must be energized for a minimum of 5 hours prior to starting compressor.
5) High-Pressure Switch
Panasonic scroll compressors require a high-pressure switch in order to protect the compressor during
blocked fan or fan failure conditions. The recommended settings are shown in Table 3-3
Table 3-3 High Pressure Switch Setting
Refrigerant
Cut-Off setting
R407C
464 psig (3.2MPa G)
R410A
602 psig (4.15MPa G)
R134a
348 psig (2.4MPa G)

17
4. 0 Assembly and Manufacturing Process Considerations
For safe installation and trouble-free operation of compressor and air-conditioning system, below instructions
should be carefully read and strictly followed before beginning.
4.1 Removing Rubber Plug
Each compressor is shipped with a dry Nitrogen holding charge between 0.12~0.18MPa (G) (18~26 psig)
and sealed with rubber plugs.
The compressor should be kept horizontal not less than 3 hours and not be declined while removing rubber
plugs. The suction plug should be removed first before pulling the discharge plug to avoid loss of oil. Few
refrigerant oil may be stored in the discharge tube, please take care when removing the discharge plug.
Compressor should be installed into system within 15 minutes after removing the plugs.
Do not use the compressor from which the discharge sound cannot be heard when removing rubber plugs.
4.2 Compressor Mounting
In mobile applications, for the consideration of tubing reliability, it is important to minimize the motion of
compressor during operation. The mounting accessories (grommets and sleeves) that are supplied or
specified by Dalian Panasonic should be used, as shown in Figure 4-1. The upper mounting rubber(rubber1)
can reduce the up-down motion of compressor under vibration and shock conditions;
The mounting parts should be verified by test and based on applications. In severe cases, the vibration
eliminators should be mounted in the compressor discharge and suction lines to reduce the vibration
transferred from compressor to system tubing.
1-Mounting Grommet 2-Mounting Sleeve
Figure 4-1 Mounting Parts for C-SB
4.3 Residual Moisture
System residual moisture level should be kept less than 200ppm. Normally if the vacuum degree of system
can be achieved, the residual moisture level will also meet this requirement.