Panasonic OCU-R200SF User manual

Applicable Model
■
R22 ■Applicable Model…………………………………… 2
OCU-R200SF
OCU-S700HF
■Safety Precautions……………………………………
3
OCU-R300SF
OCU-S400SF
■Names of Components…………………………………
7
OCU-S350HF
OCU-S500SF
■Application Standards…………………………………
9
OCU-S400HF
OCU-S600SF
■Tips on the Effective Use of the Unit ………………
10
OCU-S400HF-D
OCU-S350QSF-D
■Selection of Installation Location……………………
12
OCU-S500HF
OCU-S400QSF ■Delivery·Installation………………………………… 12
OCU-S500HF-D
OCU-S500QSF
■Examples of Installation………………………………
13
OCU-S600HF
OCU-S600QSF
■Refrigerant Piping Work………………………………
15
■Refrigerant Oil…………………………………………
17
■
R404A
■Refrigerant Circuit Diagram……………………………
18
OCU-NR200SF
OCU-NS600HF
■Refrigerant Charge………………………………………
24
OCU-NR200SF-D
OCU-NS700HF
■Electrical Wiring Work…………………………………
25
OCU-NR300SF
OCU-NS400SF ■PCB Function……………………………………… 30
OCU-NR300SF-D
OCU-NS500SF
■PCB Function…………………………………………
30
OCU-NS350HF
OCU-NS600SF
■Check Points and Settings for Operation………………
32
OCU-NS400HF
OCU-NS350QSF-D
■Maintenance……………………………………………
34
OCU-NS400HF-D
OCU-NS400QSF
■Troubleshooting Guide…………………………………
35
OCU-NS500HF
OCU-NS500QSF
■Troubleshooting Analysis………………………………
36
OCU-NS500HF-D
OCU-NS600QSF
■Warranty Conditions…………………………………
38
Contents
Outdoor Condensing Unit
SERVICE MANUAL
Thank you for having purchased
Panasonic product! For proper
installation and maintenance, please
read and follow this manual carefully
before beginning. Please keep this
manual for future reference.

■
R22 Model ■R404A Model
OCU-R200SF
OCU-S700HF OCU-NR200SF OCU-NS600HF
OCU-R300SF
OCU-S400SF OCU-NR200SF-D OCU-NS700HF
OCU-S350HF
OCU-S500SF OCU-NR300SF OCU-NS400SF
OCU-S400HF
OCU-S600SF OCU-NR300SF-D OCU-NS500SF
OCU-S400HF-D
OCU-S350QSF-D OCU-NS350HF OCU-NS600SF
OCU-S500HF
OCU-S400QSF OCU-NS400HF OCU-NS350QSF-D
OCU-S500HF-D
OCU-S500QSF OCU-NS400HF-D OCU-NS400QSF
OCU-S600HF
OCU-S600QSF OCU-NS500HF OCU-NS500QSF
OCU-NS500HF-D
OCU-NS600QSF
OCU-S500HF
2
Page
Applicable Model
Outline
Outdoor Condensing Unit

■
The following symbols used in this manual are divided into 2 sections according to the level of safety hazard and damage.
■The items to be followed are classified by the symbols:
Install the unit at a strong and firm location
Conduct a airtight test.
Please fix the unit with anchor bolts.
Improper installation can cause the unit to tip over and cause injury.
3
Installation Work
CAUTION
WARNING
This symbol indicates a hazard or unsafe practice which can result in severe personal injury
or death.
This symbol indicates a hazard or unsafe practice which can result in personal injury or
product or property damage.
This symbol indicates the【Prohibited】item.
To prevent vibration, install a vibration-proof pad (8-15mm thick) on the foot
of the unit and fix it with anchor bolts.
If the installation is not properly done, the unit may collapse
and cause injury.
Standard foundation is basically the concrete foundation with
the weight about 3 times the weight of the unit. The unit
should be fastened at the foundation with anchor bolts.
The leakage of refrigerant will cause oxygen deficiency and
result in death, it may also cause electrical shock or fire.
Make it sure to conduct a airtight test and confirm there is no
leakage.
Use the attached accessories and specified parts for installation.
Otherwise, it will cause the unit to fall, get fire or electrical
shock.
Install the refrigerant piping properly before the airtight test.
The leakage of refrigerant will cause suffocation.
Installation must be done by qualified technicians, or electrical
shock or fire will be resulted in.
Do not use (charge, add or replace) air or gas other than the
designated refrigerant.(R22/R404A)
Otherwise, an excessively high pressure may result in unit
burst and cause injury.
A defective installation will result in electrical shock or fire.
Install properly according to this manual strictly.
This symbol indicates the item that 【Must Be Taken】
Safety Precautions
In order to avoid any personal injury or property damage, please read following “SAFETY PRECAUTIONS” carefully before perform
any servicing.
WARNING
Page
Make it sure to follow
vibration-
proof pad

Make it sure to use the designated circuit. This unit must be properly earthed.
Connect the cables tightly. Be sure to fix the components of unit perfectly.
Do not change the settings of safety devices.
Request professionals for disassembling and repair. Shut down the unit in case of abnormal operation.
Consult professionals when relocating the unit.
Improper relocation may cause abnormal vibration and cause refrigerant leak, electrical shock or fire.
4
Repair Work
Do not insert fingers, sticks, or other objects into the fan cover.
Be sure to follow the local national wiring
standards,regulations and installation instruction. Use the
designated circuit and install an earth leakage breaker.
Improper installation will cause electrical shock or fire.
The earthing work should be implemented by electrical
specialists.
Earth line must not be connected to gas line, water pipe, earth
of lighting rod and telephone. Otherwise, it may cause
electrical shock.The earth wire should be special one (with the
color of yellow and green)
Use the designated cables and connect the cables properly to
make sure no external force will act on the terminal. If
connecting or fixing is not perfect, it will cause heat up or fire.
Fix the cover for electric box and control board perfectly.
Otherwise, it will cause fire or electrical shock.
Page
During pump down operation, stop the compressor before
taking off the piping.
Removal of the piping while compressor is running will mix
the air in the system, cause abnormal high pressure of the
refrigeration cycle and result in explosion and injury.
Relocation/Move
Operation in this condition will cause short circuit and
electrical shock or fire.
Prevent the the electrical components from cleaning with
water or wetted by water.
It is strictly forbidden the personnel other than
professionals to disassemble, repair or modify the unit.
Improper disassembling or repair may result in abnormal
operation, thus cause injury, electrical shock or fire.
The safety devices are equipped in this unit. The change
of setting may disable the safety shutdown and cause the
unit burst or fire.
The high speed fans may cause injury.Do not insert
fingers, sticks, or other objects into the air vent of unit
panels.
Consult professionals in the case of the tripping of earth leakage
breaker.
When water entering into the electric box, shutdown the power
and the earth leakage breaker.
Forcible power recovery may cause electrical shock or
fire.
⑴In case of abnormal operation, shut down the unit and turn
off the earth leakage breaker. The continuous operation of unit
under abnormal conditions will cause electrical shock or fire.
⑵Consult with your construction side immediately when the
warning light turning on.
Safety Precautions
Electrical Wiring Work
Operating Precautions
Make it sure to follow

Only the operator can touch the unit
Conduct drain work.
Install the unit in a well-ventilated location.
5
Use of an earth leakage breaker with wrong capacity
may disable the safety shutdown and cause electrical
shock or fire.
Electrical Work
Do not wrap the electrical cables into the heat insulation
materials which covering the piping.
Putting electrical cables and the refrigerant piping
together may lead to overheat of the cables, which may
cause fire.
Safety Precautions
Installation Work
CAUTION
Page
Set up the notice label and guard rail to prevent
personnel other than specified operators to operate the
unit. Wrong operation to the unit may cause injury.
Water will be released from the unit after rain or
defrosting process. If the drain work is not done
properly, the wet surface may be slippery with mold and
moss, which may cause injury.
Refrigerant leakage may cause oxygen deficiency and
personnel injury.
Do not install the unit in a place where the flammable gases
may leak.
The leaked flammable gas accumulating surrounding of
the unit may cause fire.
Form a refrigeration cycle within the application standards of
specification.
Formation a refrigeration cycle beyond the boundaries of
specification may cause explosion, smoke, ignition,or
short circuit.
Condensation of moisture or frosting may occur on the suction
piping.
Do heat insulation work. Otherwise the water will make
surroundings wet.
Handle the unit with care. Do not turn over the unit when
transportation.
The unit is a heavy load, keep vertical position when
moving the unit with forklift truck. Improper loading
may lead falling and cause injury.
Precautions should be noted when the unit is operated at the
first time.
When the unit is operated for the first time, please fix the
unit on the foundation and let it stand for at least 2 hours
before turning it on.
Ensure to install an earth leakage breaker with the designated
capacity.
Make it sure to follow

Do not touch electrical components with wet hand.
Check the installation platform periodically.
Do not climb or put other objects on the unit. Do not operate the unit when the service valve is closed.
Consult professionals when disposing of the unit.
Recover all the refrigerant before disposal.
6
When removing the fin guard of the condenser,do not touch the
fin.
A spark from switches may lead to ignition, thus
catching fire.
Touching the fin and sliding along the fin may cause
skin cut by the fin edge.
The refrigerant in the unit must be recovered. The
release of refrigerant into the air will pollute the
environment. Consult with professionals for recycle or
disposal.
Safety Precautions
Operating Precautions
Disposal
Do not touch the high temperature parts of unit with hand.
Check the operation of earth leakage breaker periodically.
Page
Use of a defective earth leakage breaker will disable the
safety shutdown, which may cause electrical shock or
fire.
The use of a deteriorated platform may lead to the
collapse or fall of the unit, thus causing injury.
Climbing or placing objects on the unit may result in the
collapse or fall of the unit, thus causing injury.
Operating while closing the high pressure service valve
leads the abnormal high pressure. It may cause the
explosion.
Take care of the liquid refrigerant when open the refrigerant
cycle.
Turn off the power supply when conducting maintenance
and inspection.
Applying current when doing the cleaning or carrying
out maintenance and inspection may cause electrical
shock, injury, or burn.
The refrigerant will spray out when opening the service
valve. The refrigerant may generate toxic gases when it
contacts flames.
Do not handle switches with wet hand. Otherwise, it
may cause the electrical shock.
Because of the high temperature, Touch with compressor
or discharge piping will hurt your hand.
If the unit is disposed of while it is still filled
with refrigerant and oil, the unit may cause fire
and explosion.
Do not use a flammable aerosol spray near the unit or do not put
combustible materials near the unit.
Make it sure to follow

Models
：
OCU-R200SF
OCU-NR200SF
OCU-R300SF
OCU-NR200SF-D
OCU-S350HF
OCU-NR300SF
OCU-S400HF
OCU-NR300SF-D
OCU-S400HF-D
OCU-NS350HF
OCU-S400SF
OCU-NS400HF
OCU-S400QSF
OCU-NS400HF-D
OCU-S350QSF-D
OCU-NS350QSF-D
Operation Manual 1 copy
Page 7
Attachment
Names of Components
Names of the Components
Fan Motor
Condenser
Suction
Accumulator
Electric Control
Box
Service Valve
Gas Make-up
solenoid valve
Fusible
Plug
Accumulator
Pressure
Switch
Suction line
Service valve
Drier Filter
Compressor
Air Make-up
expansion
Sight
Glass
Liquid Line
Service
Fan Cover
Fan Blade
Electric
control
box
cover

Models:
OCU-S500HF
OCU-NS500HF
OCU-S500HF-D
OCU-NS500HF-D
OCU-S600HF
OCU-NS600HF
OCU-S700HF
OCU-NS700HF
OCU-S500SF
OCU-NS500SF
OCU-S600SF
OCU-NS600SF
OCU-S500QSF
OCU-NS500QSF
OCU-S600QSF
OCU-NS600QSF
Fuse Tube 5A 250V 2 pcs, for operation circuit
Operation Manual 1 copy
8
Page
Names of Components
Names of Components
Attachment
Suction line
Service
valve
Liquid Line
Service
Valve
Fan Cover
Electric
control
box
cover
Pressure
Switch
Drier Filter
Compressor
Sight
Glass
Fan Blade
Fusible Plug
Accumulator
Service Valve
Fan Motor
Condenser
Electric Control Box

Application for medium and low temperature scroll units:：
Please select the unit model reasonably according to the operating temperature.
9
Page
Nominal working conditions: evaporation temperature -7 ° C, suction temperature 18 ° C, condenser inlet air temperature (dry
bulb temperature) 32 ° C.
Under the system that operates at evaporating temperature about -5℃for long time, low temperature make-up gas unit,which
runs in the high load condition of compressor easily resulting in the compressor overload and burn-out.The compressor motor of
the low-temperature make-up gas unit is configured according to the low-temperature load and the motor capacity is smaller than
that of the medium-temperature compressor with the same number of HP, so it is easier to burn out when overload occurs.
The cooling capacity generated by the low-temperatur gas make-up unit in the middle temperature state (-5°C~-15°C) is
equivalent to the cooling capacity of medium-temperature units with the same HP (in the medium-temperature state, the
compressor will be overloaded, and make-up gas is controlled by discharge temp) . As the evaporation temperature decreases, the
discharge gas temperature increases, and the amount of gas supplementation gradually increases. When the evaporation
temperature is below -25 °C, the supercooling effect is manifested.
Application Standards
Technical Specifications
Precautions for Model Selection
The unit shall be operated within below range
Refer to the unit nameplate for the nominal cooling capacity, input power, performance factor, operating coefficient, and
operating current of the unit.
Applicable
Model Unit
OCU-R200SF
OCU-R300SF
OCU-S350HF
OCU-S400HF
OCU-S400HF-D
OCU-S500HF
OCU-S500HF-D
OCU-S600HF
OCU-S700HF
OCU-S400SF
OCU-S500SF
OCU-S600SF
OCU-S350QSF-D
OCU-S400QSF
OCU-S500QSF
OCU-S600QSF
OCU-NR200SF-D
OCU-NR300SF-D
OCU-NR200SF
OCU-NR300SF
OCU-NS400SF
OCU-NS500SF
OCU-NS600SF
OCU-NS350QSF-D
OCU-NS400QSF
OCU-NS500QSF
OCU-NS600QSF
OCU-NS350HF
OCU-NS400HF
OCU-NS400HF-D
OCU-NS500HF
OCU-NS500HF-D
OCU-NS600HF
OCU-NS700HF
Refrigerant
Evaporating Temp.
℃-40～-5 -15～10 -40～-5 -40～-5 -40～-5 -15～10
Suction Pressure
MPaa)
0.005～
0.320
0.25～0.62 0.005～0.25 0.008～0.42 0.008～0.42 0.27～0.73
Suction Temp.
℃
Suction Superheat K
Condensing Temp.
℃
Discharge Pressure MPa
Discharge Temp.
℃
Oil Temp.
℃
Ambient Temp.
℃
Power Source V
Operation Circuit V
Unbalanced
Voltage Rates
%
Installation Tilt °
ON-OFF Cycle min
Installation Location
MT and LT
Rotor Unit
MT Scroll Unit
MT and LT Rotor
Unit
MT and LT Scroll
Unit
30～55
MT Scroll Unit
1.33～2.78
MT and LT Scroll
Unit
Remark：a). Unless otherwise specified，all pressures refer to Gauge Pressure.
18 and below（according to the evaporation tempeture, the best suction superheat range is from
8~15K（on the side of unit）
R22
R404A
Outdoor installation
Items
3 and below
10(minimum duration for start or stop is 3）
Single phase 220±10%
2 and below
30～55
1.09～2.50
-7～48（according to the data on the catalogue）
Three phase 380±10%（singe phase 220±10%}
115 and below
95 Max（Ambient temperature+10K and over）

Following tips are the recommendations for the economical use of the condensing unit, for your reference.
Cooling capacity greatly varies depending on application conditions.
1.Minimize the pressure drop in piping while ensure the oil return rate.
Reference: Rates of capacity change per pressure loss by 1°C (in suction pipe)
Evaporating temp (°C)
Reference: Rates of capacity change per pressure loss by 1°C (in discharge pipe)
2.Increase evaporating temperatures by selecting a evaporator with sufficient capacity.
3.Do not block with food, etc. the cool air outlet and inlet of the refrigerator (freezer) or showcase.
4.Open and close the door of the refrigerator (freezer) as quick as possible (do not keep the door open unnecessarily to prevent cool air from running away)
5.Keep the condenser clean by doing the cleaning periodically to prevent clogging.
Reference: Rates of capacity change per change in air inlet temperature of condenser by 1°C
Evaporating temp (°C)
10
Page
Tips on the Effective Use of the Unit
For Economical Use
Compressor sump temperature analysis
After the compressor runs smoothly, please make sure that the operation condition of compressor is not in the liquid return area
according to the following table. If the liquid returned is too much, please adjust the expansion valve.
Cooling capacity decreases by 3 to 6% as evaporating temperature (temperature-conversion value of the pressure measured at the entrance to unit) drops by
1°C. As condensing temperature rises by 5°C, of the pressure measured at the entrance to unit) drops by 1°C. As condensing temperature rises by 5°C,
cooling capacity decreases by about 9 to 18%, with the increase of power consumption.
Rates of capacity change per
1°C
-5～-20
2～3％
-20 and below
3～4％
Evaporating
temperatures (°C)
Rates of capacity change per
1°C
-5～-20
2～3％
-20 and below
3～4％
To optimize the performance of condensing unit, it is important to increase suction pressure and decrease discharge
pressure as much as possible.
Rates of capacity change per
1°C
-5～-20
3～4％
-20 and below
4～6％
Safe Area
Unsafe Area
Evaporating Temp.
C
ompressor Oil Tank Temp.

The filter dryer in this unit will react with water and air, so please carefully observe following instructions.
Never install this unit into a refrigeration system which is using different type refrigerant or oil. ( Only use this unit in a
new system in case of the cleanliness, impurities and oil) .
System
Components
Installation：1.Do the construction work of refrigerator connections at the end of piping work.
3. Conduct the air-tight test. Use the specified leakage detector for designated refrigerant.
(Halogen Leak Detector has less sensitivity for R404A).
The crankcase heater is recommended be used to prevent refrigerant migration and oil dilution in compressor.
1. Install the unit in a place where no corrosion gas(nitrogen oxide:NOx etc.) or salt air.
2.Use the concrete foundation with the weight about 3 times the weight of the unit. The tilt of unit should be less than 3°.
3. The antivibration pads should be installed between the unit and foundation if the vibration may transfer to the building.
4. For cold room application, or the ambient temperature of unit lower than room temperature：
A．The refrigerant flood back may happen due to the continued operation of evaporator fan motor after defrosting.
1～2分钟。
A timer should be installed to set the operation time of fan motor within 1~2 minutes.
B．Apply the pump down cycle to avoid refrigerant migration in long period stopping.
5.Please install the filter dryer and sight glass horizontally behind liquid line service valve when connect the pipes
to ensure the operation safety and stability of the unit.
11
Page
Installation of Unit
Tips on the Effective Use of the Unit
Use in Cold Weather Regions
Use with Specified Refrigerant
2.The refrigerant connection should be assembled within 30 minutes and then the airtight test should be done.
In cold weather regions (where daytime temperatures plunge to some degrees below zero), if the ambient temperature of the Refrigerator
(temperature inside) becomes higher than the ambient temperature of the unit, the use of pump down cycle during the defrosting process is advisable
to prevent refrigerant
If the ambient temperature of the unit becomes less than -5°C, take measures to prevent the fast fall of high pressure, for example by enclosing the
unit with some materials.
1.Use the specific expansion valve for designated refrigerant.
2. Dry the components thoroughly after cleaning process.
3.Use clean deoxidized copper pipes for piping and phosphor copper filler as a brazing material. "In case of
the use of silver solder, do not use flux containing chlorine."
4.Use hub oil seal for pipe joints (pipe for a refrigerant).
5. Suction filter is recommended to prevent metal pieces entering into compressor.
Filter Dryer
Sight Glass
Flow direction of
refrigerant

General precautions
12
Water will released from the unit after rain or, in some cases,
after defrosting process. Do drainage work, if necessary.
In the cold weather regions, ensure that the unit is not exposed to snow
in winter, and that freezing and frost formation are minimized, for
example by covering the unit with a roof.
Ensure that discharge wind from condenser and noise from the
compressor would not annoy the neighborhood.
Unloading
Transportation
In a place where is well drained
In a place where there is no influence of snow
In a place where the floor is robust and level
In a place where is heat-proof
Install the unit in a well-ventilated place where air
temperatures to condenser less than 43°C for better heat release.
Do not install the unit in a place where the unit would be
influenced by corrosive gas (salt water, toilets, incinerators,
wastewater treatment facilities, chemical plants, exhaust from
cars or heaters, etc.)
Delivery·Installation
Install the unit on the robust foundation so that noise would
not be amplified. Attention should be taken for the boundary
with neighbors and niose level regulation.
For the installation of the equipment, select a location where it is easy to do construction work and to perform daily operation and maintenance.
Page
Install the unit so that the unit would not be influenced by
sunlight reflection from the floor.
Selection of Installation Location
In a place where not disturb neighbors
In a place where easy for maintenance
Measure Against Strong Wind
In a place where it is well-ventilated and where it is
environmentally safe
①① As for distance between the equipment, select a place where the length of piping and wiring become as short as possible, and
where it is easy to do construction work.
②② Install the equipment in a place where it is easy to do daily inspection and maintenance work. (Daily inspection and
maintenance includes checks of operation pressure, the moisture indicator, the filter dryer, the magnetic contactor, etc. )
Set the air outlet side of unit is at right angle to wind flow
direction.
Be sure to prevent the vibration of unit(especially compressor)
during transportation.
Unload the unit with care so that the unit is kept upright as much as possible.
Never allow the unit to lie on its side. When unloading the unit by forklift
truck, etc, place the unit on a pallet so that it can be kept upright.
Ensure that a space for maintenance and service work is
preserved.

13
Page
When there are obstructions near the air outlet side
Examples of Installation
When there are no obstructions near the air outlet side
and above
and above
and above
and above
air
air flow
180mm and above
2000mm and above
(850+h) mm and above
(300+h) mm
and above

14
Page
Face to face(Face to back) Installation
Examples of Installation
Double Stack Installation
Back to Back Installation
600mm
and above
3500mm
and above
1000mm
and above
180mm
and
above
150mm
and above

1.Spray with nitrogen gas during brazing (Strictly abide by).
2.Use the deoxidized phosphorus copper pipes that are clean both inside and outside.
After the piping construction work, conduct the air-tight test as below:
1.Install and insulate the bulb according to the instruction. Make it sure minimum 5K superheat in all conditions.
Install angle of Bulb
Pipe diameter less than φ25.4(1 inch)：upper position
Pipe diameter more than φ25.4(1inch)：Lower postion 45° （4 o'clock position）
15
Page
2.The superheat degree will become less in winter season, adjust the expansion valve to make sure minimum 5K
superheat degree.
Expansion valve
Since the unit is composed of highly-precise components, any contaminants mingled into will damage the unit, with gas leakage,
capacity reduction, even abrasion and burn.
The bulb package installation method is as shown in the
figure. The bulb needs to be installed horizontally.
The quality of the design and construction work of refrigerant piping has great impact on the performance and reliability of Condensing unit. Observe precautions
given below in the case of design and construction work.
The compressor is cooled by liquid injection, if the refrigerant charge volume is not enough, the cooling effect will be decreased due to gas bubble in liquid line, it
will result in high temperature of compressor. Do not operate the unit under lack of refrigerant conditions.
Air-tight Test（After piping construction work, before heat insulation work）
Size of refrigerant piping
Do not contaminate the unit with dust, metallic powder, oxidized scale, etc.
Refrigerant Piping Work
R22
2.8MPa
1.4MPa
R404A
2.84MPa
1.75MPa
Suction Line
5/8"（φ15.88）
3/4"（φ19.05）
3.When cutting or deburring a copper pipe, do not allow chips to contaminate the pipe. The customer should install the
suction filter on the suction line by themselves.
Refrigerant
High Pressure Side
Low Pressure Side
The sizes of piping by unit models are given as below. However, note that an optimal size shall be decided by calculating the loss of pressure in piping and the
flow rates of a refrigerant so that cooling capacity and oil return would not be affected.
Model
OCU-R Series, OCU-NR Series
Other Model
Liquid Line
3/8"（φ9.53）
3/8"（φ9.53）
45°
Insulation
Material
Metal Fixture

●
Difference in height shall be within 5 meters.
Otherwise, flash gas may be caused by increased pressure loss
of a liquid refrigerant due to difference in height.
Other notes:
* Heat Insulation material: Insulate the piping from evaporator to
compressor.Thickness of 25mm and above for refrigerator / 50mm
and above for freezer.
*Liquid line solenoid valve: close to expansion valve.
*Downward slope: 1/200~1/250
*Oil trap(U-trap): dimension as small as possible
*refrigerant floodback prevent loop:should be installed higher
than the location of evaporator.
●
For better oil return, set the oil trap in every 6 meters height.
Difference in height shall be within 20 meters.
Other notes:
* Heat Insulation material: Insulate the piping from evaporator to
compressor.Thickness of 25mm and above for refrigerator / 50mm
and above for freezer.
*Liquid line solenoid valve: close to expansion valve.
*Downward slope: 1/200~1/250
*Oil trap(U-trap): dimension as small as possible
*refrigerant floodback prevent loop:should be installed higher
than the location of evaporator.
16
Refrigerant Piping Work
When the evaporator is installed above the unit
When the evaporator is installed below the unit
Page
Condensing
Within 5m
Evaporator
Liquid
line
sole-
noid
valve
Downward
slope
Liquid prevent loop
Condensing
Unit
Downward
slope
Within 6m
U-trap
U-trap
Downward slope
Within 6m
Within 20m
Liquid line
solenoid valve
Evaporator
Minimum 7.6m/s
in vertical line
Minimum 3.8m/s in
horizontal line
U-trap

When the length exceeds 10 meters, charge the refrigerant oil according to the following rules:
1/2 10
5/8 20
3/4 30
7/8 40
1 50
17
When the length of the main suction pipe （single course and including the pipe length in vertical position）exceeds 10
meters, charge the refrigerant oil according to the following rules:
Page
Refrigerant Oil
The piping of the refrigeration system should be connected by welding as much as possible. In the welding, the method of
charging the pipe with nitrogen should be adopted to prevent the occurrence of scale, and also to protect the valve gasket and
packing from heat damage.
The refrigerant used in the condensing unit should be of the type indicated on the compressor's nameplate, and other refrigerants
should not be misused. The compressor of the R404A refrigerant condensing unit is charged with special synthetic refrigerating
oil. This special refrigerating oil is not allowed to be mixed with other mineral oils or synthetic oils, and this special synthetic
refrigerating oil is highly susceptible to moisture, so it should be connected to the system after the refrigeration system is fully
dry. The compressor of the condensing unit using R22 refrigerant is charged with (our company coded) mineral oil.
For scroll unit, it is possible to directly add refrigerant oil more than 35% of the original amount (see the catalogue), and for the
rotor unit, it is recommended to charge the refrigerant more than 25% of the original amout. Before connecting refrigeration
system, ensure all components clean and dry. Pipes connected to unit should be flexibly structured. The horizontal section of
suction pipe should be inclined to the direction of compressor. The flow rate of the gas to ensure oil return should be not less than
4 m/s. The flow rate of the refrigerant vapor in the vertical ascent section of the suction pipe should be not less than 8 m/s , but
the flow rate of refrigerant in air tube shouldn't exceed 15 m/s. When the evaporation temperature is below 10 °C, the suction
For the R404A refrigerant system, pay special attention to the leakage check of the welded joint. For systems using R404A
refrigerant, speacial dry filter, expansion valve, pressure switch and sight glass and other accessories should be used. Dry filter
can not adopt silica gel. Refrigerant charging equipment and vacuuming equipment should be used exclusively and should not be
mixed with R22's.
Technical Specification
Refrigerant Oil Replenishment for Unit
冷媒 机组型号
压缩机头原冷
冻油充填量L
冷冻机油 机组型号
压缩机头原冷
冻油充填量L
冷冻机油
OCU-R200SF 0.9 OCU-S350HF 1.7
OCU-R300SF 0.9 OCU-S400HF 1.7
OCU-S350QSF-D 1.7 OCU-S400HF-D 1.7
OCU-S400QSF 1.7 OCU-S500HF 1.7
OCU-S400SF 1.7 OCU-S500HF-D 1.7
OCU-S500QSF 1.7 OCU-S600HF 1.7
OCU-S500SF 1.7 OCU-S700HF 1.7
OCU-S600QSF 1.7
OCU-S600SF 1.7
OCU-NS350QSF-D 1.7 OCU-NR200SF 0.9
OCU-NS400QSF 1.7 OCU-NR200SF-D 0.9
OCU-NS400SF 1.7 OCU-NR300SF 0.9
OCU-NS500QSF 1.7 OCU-NR300SF-D 0.9
OCU-NS500SF 1.7 OCU-NS350HF 1.7
OCU-NS600QSF 1.7 OCU-NS400HF 1.7
OCU-NS600SF 1.7 OCU-NS400HF-D 1.7
OCU-NS500HF 1.7 OCU-NS600HF 1.7
OCU-NS500HF-D 1.7 OCU-NS700HF 1.7
R-22
R-404A
3GSD-T
3GSD
FV32S
FV68S
SAY-56T
FV68S
Ref.
Model
Ref. Oil Amount
Ref. Oil
Model
Ref. Oil Amount
Ref. Oil

Models：
OCU-R200SF OCU-NR200SF
OCU-R300SF
OCU-NR300SF
Models：
OCU-NR200SF-D
OCU-NR300SF-D
Page #
Refrigerant Circuit Diagram
Condenser
Dryer/Filter
Sight/Glass
Fusible Plug
Accumulator
Liquid
Injection
Cooling
Suction
Accumulator
Low pressure gas
inlet pipe φ15.9
（Internal Welding）
Filter
Customer
oriented
High pressure liquid Pipe φ$15.9$
（
Internal$Welding）
Condenser
Fusible Plug
Accumulator
Dryer/Filter
Sight/Glass
Liquid Injection
Cooling
Suction
Accumulator
Pressure-equalizing$
solenoid$valve
Low pressure gas inlet pipe
φ15.9 （Internal Welding）
Filter
Customer
oriented
High pressure liquid Pipe φ$9.52$
（
Internal$$Welding）

Models：
OCU-S350HF OCU-S400HF OCU-S500HF OCU-S600HF OCU-S700HF
Models：
OCU-NS350HF
OCU-NS400HF
OCU-NS500HF
OCU-NS600HF
OCU-NS700HF
Page #
Refrigerant Circuit Diagram
Condenser
Accumulator
Fusible Plug
Dryer/Filter
Sight/Glass
Liquid Injection
Cooling
Low pressure gas inlet
pipe φ19.05 （Internal
Welding）
Filter
Customer
oriented
High pressure liquid Pipe φ$9.52$
（
Internal$Welding）
Condenser
Fusible Plug
Accumulator
Dryer/Filter
Sigh
t/Glass
Low pressure gas inlet
pipe φ15.9 （Internal
Welding）
High pressure liquid Pipe φ$9.52$
（
Internal$$Welding）
Filter
Customer
oriented

Models：
OCU-S400HF-D OCU-S500HF-D
Models：
OCU-NS400HF-D OCU-NS500HF-D
Page #
Refrigerant Circuit Diagram
Condenser
Fusible Plug
Accumulator
Dryer/Filter
Sight/Glass
Liquid
Injection
Cooling
Low pressure gas
inlet pipe φ19.05
（Internal Welding）
High
pressure liquid Pipe φ$9.52$
（
Internal$Welding）
Filter
Customer
oriented
Pressure-equalizing$
solenoid$valve
Suction
Accumulator
Condenser
Accumulator
Fusible Plug
Dryer/Filter
Sight/Glass
High pressure liquid Pipe φ$9.52$
（
Internal$$Welding）
Filter
Customer
oriented
Pressure-equalizing$
solenoid$valve
Suction
Accumulator
Low pressure gas inlet pipe φ
19.05 （Internal Welding）