Ulvac PVD-180 User manual

SK00-4167-DI-002-07
INSTRUCTION MANUAL
OIL SEALED ROTARY VACUUM PUMP
PVD-180，PVD-180B
PVD-360，PVD-360B
Before using this product, be sure to read this operation manual.
Keep this manual with care to use at any time.
ULVAC, Inc.
Components Division
http://www.ulvac.co.jp/

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Contents-1
Table of Contents
Types and Descriptions of Warning Labels Displayed on The Pump and Displayed Positions................ 1
ⅠPump Outline ........................................................................................................................................ 3
ⅡPreparation............................................................................................................................................ 6
1. Inspection ........................................................................................................................................ 10
2. Mounting.......................................................................................................................................... 10
3. Lubrication....................................................................................................................................... 10
4. Electrical Connection .......................................................................................................................11
5. Connection with Vacuum System ................................................................................................... 13
Ⅲ Operation........................................................................................................................................... 15
1. Pump Start ...................................................................................................................................... 15
2. Pump Stop....................................................................................................................................... 15
3. Gas-ballast Valve ............................................................................................................................ 16
4. Vacuum Pump Oil ULVOIL R-42 for Winter Use............................................................................. 16
5. Oil mist trap (Option) ....................................................................................................................... 17
Ⅳ Pump Performance ........................................................................................................................... 17
1. Ultimate Pressure............................................................................................................................ 17
2. Pumping Speed............................................................................................................................... 18
3. Power Requirements....................................................................................................................... 19
Ⅴ Maintenance and Check ................................................................................................................... 20
1. Maintenance.................................................................................................................................... 20
2. Regular Check................................................................................................................................. 20
2-1 Check and Replace Vacuum Pump Oil .................................................................................... 20
2-2 Check and Replace V-belt........................................................................................................ 21
2-3 Oil Leak Check ......................................................................................................................... 23
2-4 Checking Gas Ballast Function ................................................................................................ 23
2-5 Checking Metal Mesh at the Suction Inlet................................................................................ 23
2-6 Checking Noise and Abnormal Vibration.................................................................................. 23
2-7 Checking Oil Mist Trap (option)................................................................................................ 23
3. Main replacement parts................................................................................................................... 24
4. Trouble Shooting ............................................................................................................................. 25
5. Warranty Clauses............................................................................................................................ 29
5-1 Warrantable Items .................................................................................................................... 29
5-2 Duration of guarantee............................................................................................................... 29
5-3 Warrantee scope ...................................................................................................................... 29

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Contents-2
5-4 Response procedure ................................................................................................................ 29
5-5 Disclaimer................................................................................................................................. 30
5-6 Others ....................................................................................................................................... 30
Request Form for Repair/Inspection of ULVAC Components /Certificate of Contamination
SERVICE CENTER
Tables and Illustrations
Fig. 1 Display positions of Labels ............................................................................................................ 2
Fig. 2 Dimensional drawing PVD-180...................................................................................................... 6
Fig. 3 Dimensional drawing PVD-360...................................................................................................... 6
Fig. 4 Dimensional drawing PVD-180B ................................................................................................... 7
Fig. 5 Dimensional drawing PVD-360B ................................................................................................... 7
Fig. 6 Dimensional drawing PVD-180-H＋RF-1＋RF-7........................................................................... 8
Fig. 7 Dimensional drawing PVD-360-H＋RF-3＋RF-8........................................................................... 8
Fig. 8 Dimensional drawing PVD-180-H＋RF-2 ...................................................................................... 9
Fig. 9 Dimensional drawing PVD-360-H＋RF-5 ...................................................................................... 9
Fig. 10 Oil filling ..................................................................................................................................... 10
Fig. 11 Electrical wiring diagram for Vac. Lock Valve ............................................................................ 12
Fig. 12 Connection with Vacuum System for PVD-180, PVD-360 ........................................................ 13
Fig. 13 Connection 1 with Vacuum System for PVD-180B, PVD-360B................................................. 14
Fig. 14 Connection 2 with Vacuum System for PVD-180B, PVD-360B................................................. 14
Fig. 15 Connection with Vacuum System for PVD-180-H, PVD-360-H................................................. 14
Fig. 16 Mount the oil mist trap to the pump ........................................................................................... 17
Fig. 17 Pumping speed curves .............................................................................................................. 18
Table 1 Details model list ......................................................................................................................... 3
Table 2 Optional specifications and gasket material/oil type comparison table ...................................... 4
Table 3 Performance specifications ......................................................................................................... 5
Table 4 Rated current for the standard motor.........................................................................................11
Table 5 Standard motor terminal size and protection circuit selection criteria....................................... 12
Table 6 PVD-180, PVD-180B, PVD-360, PVD-360B Main replacement parts list.............................. 24
Table 7 PVD-180-H, PVD-360-H Main replacement parts list ............................................................ 24
Table 8 Performance specifications ....................................................................................................... 25
Table 9 Making format for names and contents of hazardous substances or elements ......................... A

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Types and Descriptions of Warning Labels Displayed on The Pump and
Displayed Positions
Warning labels are attached on the warning locations in this system.
Be sure to check them before starting operation of the Pump.
1
Before use, read through the instruction manual and fully
understand its contents.
2
・
You may get an electric shock in the area around a portion with
this warning label. Before maintenance or wiring, be sure to turn
off the primary power supply.
・
Be sure to close the lid of the terminal box before operating this
unit. Never open it during operation.
3
During operation or for a while after operation stops, do not touch
the unit as each portion is at a very high temperature. -
If a human
body touches the unit, it may get burned.
4
・This product is not made as the withstand pressure structure.
Ensured pressure value of the Pump shall be 0.03MPaG
(0.3kg/cm2G) (Gauge pressure).
・Do not run the Pump on blocking the Exhaust outlet or putting
any device that might hamper gas passage onto the outlet. There
is a risk that the pressure inside the vacuum pump rises up to
cause break the casing or Oil level gauge resulting in overload of
the motor.
・Following gases cannot be evacuated because these gases may
cause the
pump inner pressure to increase due to internal combustion.
1) explosive gas
2) flammable gas
3) gas which increases the susceptibility of substances to burn.
Long term storage of the Vacuum pump without operation might
possibly cause trouble in operation caused by rust i
f you kept the
Pump long time without
operating it, ask a closest Service Center
for the check.
Indoor Use Only
Mount at least 100mm from side walls.

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5
・
There is a moving part around the section that this warning label
is put.
・Do not open a panel or a safety cover during operation.
・You should turn off the power line of the moving part If the
power of this Pump doesn’t supply, the moving part may have a
possible to move the moving part. Be sure to be caught in this
Pump.
Fig. 1 Display positions of Labels

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ⅠPump Outline
1. Characteristics
The PVD-180, PVD-180B, PVD-360 and PVD-360B type oil rotary vacuum pump is a two-stage rotary
blade type, compact, robust, easy to use, and designed to withstand a wide range of operating
conditions. The ultimate pressure is low, and the vibration and noise associated with operation are
sufficiently low. It is equipped with the following functions.
(1) Employment of gas ballast function
This product is installed with the gas ballast function as standard, so please use the gas
ballast function according to your application. It is applicable to breathe in the condensed
gas such as the steam and solution vapor.
Note : Spec.H don't have the gas ballast function.
(2) Oil anti-sack (backflow prevention device) mechanism ※Only PVD-180B, PVD-360B
When the pump stops the valve shuts off incoming oil and air and keeps a good vacuum for a long
period of time. While the pump is running, the valve is open and appropriate amount of oil is supplied
into the cylinder.
* Solenoid valve cannot support explosion-proof type.
* Not compatible with Spec.H
Table 1 Details model list
*1 There is not any naming for standard spec. Spec. K, H or Z is selectable as option. Options
for pump head and accessories are different depending on the type.

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Optional specification for special application
Following specification is available to meet various applications.
Table 2 Optional specifications and gasket material/oil type comparison table
Specification
Applicable Model Gasket material
Oil tank capacity Oil type *1
PVD-180
PVD-360
PVD-180B
PVD-360B
O-ring
Oil seal
Standard NBR Standard ULVOIL R-72
Spec. K FKM Standard ULVOIL R-72
Spec. H n/a NBR Standard ULVOIL R-72
Spec. Z NBR Increase ULVOIL R-72
*1 ULVOIL R-72 stands for mineral oil
【Spec. K】
FKM is used for O-ring and sealing material of wetted surface
FKM is used for O-ring and sealing material of wetted surface in the case of Spec.K.
Gases and solvents that are resistant to FKM can be exhausted, but this is not
guaranteed.
【Spec. H】
External leak test
It is inspected before shipment if helium leak rate from outside to the Pump is less than
10-6 Pa・m3/sec (helium leak test by hood test method). Leak rate will increase due to
aging degradation of seal materials and so leak rate during use is not guaranteed.
* PVD-180B, PVD-360B cannot support Spec.H.
Independent oil filling to oil seal
The Pump inside and atmospheric seal part are isolated each other by closing the
connection pass between the Pump inside and shaft seal by mounting the oiler to the
Pump. The Pump oil circulates through the connection pass in the case of the standard
model.
There is no gas ballast valve. Refer to contents of “gas ballast port close” for performance
described below.
【Spec. Z】
Change oil tank capacity to increase oil tank specification
Change the amount of oil in the oil tank to the oil tank specification as shown in Table 3.
This makes it easier to manage the amount of oil during high-load operation.

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2．Performance specifications
Table 3 Performance specifications
Type
Description
PVD-180
PVD-180B *2
PVD-360
PVD-360B *2
Designed pumping speed
m3/hr（L/min）
50Hz 9（155）19（310）
60Hz 11（186）22（372）
Ultimate pressure *1
Pa
GV Closed 0.67
GV Opened 6.7
Motor kW (Number of Poles) 0.4 (4) 0.75 (4)
Pump revolution
rpm
50Hz 500
60Hz 600
Maximum water vapor capacity g/hr 100
Oil ULVOIL R-72
Oil capacity
L
Standard 0.3 0.5
Z Specifications 1.5 1.7
Cooling method Air cooled
Inlet tube (O.D.×I.D.) φ28×φ19 φ34×φ27
Outlet cap mounting screw G3/4 (PF3/4) G1 (PF1)
Weight (without motor) kg 33.5 43
External dimensions WxDxH mm 238×470×321 273×500×321
Recommended oil mist trap（Optional）TMX-1
Options Oil mist trap, RF, explosion-resistant motor
Special application( Spec. K, H and Z )
*1 Measured with a Pirani gauge. (Approx. 6.7X10-2Pa when measured with a McLeod vacuum gauge.)
*2The pump of this type, PVD-180B and 360B have following specific features in comparison with the
standard type, PVD-180, -360.
1) The pump [Type: PVD-180B or 360B] has a solenoid valve called Vac. Lock Valve (means Anti
Suck Back), when the pump stops the valve shuts off incoming oil and air and keeps a good vacuum
for a long period of time.
2)While the pump is running, the valve is open and appropriate amount of oil is supplied into the cylinder.
Please note the contents of "Ⅱ-4 Electrical connections" and "Ⅲ Operation" for the running of PVD-
180B or PVD-360B.
Recommended type of oil:
(1) ULVOIL R-72 (standard oil)
(2) ULVOIL R-42 (For cold district in winter. In the case of ambient temperature 4~10℃)

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3. Dimensional drawing
Fig. 2 Dimensional drawing PVD-180
Fig. 3 Dimensional drawing PVD-360

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Fig. 4 Dimensional drawing PVD-180B
Fig. 5 Dimensional drawing PVD-360B

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Fig. 6 Dimensional drawing PVD-180-H＋RF-1＋RF-7
Fig. 7 Dimensional drawing PVD-360-H＋RF-3＋RF-8

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Fig. 8 Dimensional drawing PVD-180-H＋RF-2
Fig. 9 Dimensional drawing PVD-360-H＋RF-5

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ⅡPreparation
1. Inspection
When unpacking, check the following items,
1) Is the pump received of the exact model you have ordered?
2) Are the complete accessories contained?
2-1) In case you have ordered a pump without motor, following items should be contained in the
pack; [Pump, Pump-base, V-belt, V-belt cover, Motor-pulley, Fitting bolts of motor and Pump
oil]
2-2) In case you have ordered a pump with motor, following items should be contained in the pack;
[Pump, Pump-base, V-belt, V-belt cover, Motor-pulley, Pump oil and Motor]
3) Visually inspect if there is any damage to the pump and the parts caused by transportation.
4) Check for any looseness of screws or nuts or for any disconnection of parts.
Note: Should you have noticed any troubles or damages with the pump or its accessories, please
contact our local agency or directly to ULVAC International Department.
2. Mounting
Please set the pump horizontally on a rigid floor. The PVD pump is almost free from vibration during
operation and has no need of anchor bolts in mounting. The base of the pump should be, however,
installed reasonably flat to avoid possible rattling of the pump.
The use of anchor bolts or other fixing means is recommendable for a long time inattended running
or for running on an unstable floor. Excessive dust, acid fume, solvent vapor etc. should be avoided in
the environment.
3. Lubrication
1) Remove the outlet-cap or oil mist trap. [Fig.10] and make sure that oil drain plug is closed.
2) Fill the rotary vacuum pump oil specified by ULVOIL R-72 until the oil can be observed at the oil
level window attached to a side of the pump [Fig.10].
The optimum level is at 5 mm above the center line of the window glass during the running of
the pump. Level will change depending on suction pressure. In most cases oil is added after
operating the pump for a short while.
Note: If the amount of filled oil is by far no appropriate, the performance of the pump will not be in a
satisfactory range.
Fig. 10 Oil filling

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4. Electrical Connection
1) Fix the motor, the customer has, to the base, if the customer purchased the pump without the motor.
2) Remove the V-belt, when connecting the wires.
3) Switch in and watch the direction of rotation of the motor pulley. An arrow mark (like this: ⇒) is
put on the model name plate to indicate the right direction of rotation. If the pump does not rotate
in the right direction, interchange any two of the three-phase leads.
Fig. 11 Diagram of motor connection and pulley rotation direction
4) Be sure to install a safety circuit such as a motor breaker or fuse in front of the motor, and an
electromagnetic switch (with thermal relay) for remote starting. Use the safety circuit capacity
shown in Table 4.
Attention: Be sure to use the motor breaker. Since a current 5 to 10 times the rated current flows
when the motor starts, a general-purpose breaker may trip at the motor starting current.
Table 4 Rated current for the standard motor
200V/50Hz 200V/60Hz 220V/60Hz
PVD-180
PVD-180B 0.4kW 2.11 2.00 1.95
PVD-360
PVD-360B 0.75kW 3.36 3.12 3.02
200V class Motor Poles：4P
Model Motor Rated current（A） ※1
380V/50Hz 400V/50Hz 415V/50Hz 440V/60Hz 460V/60Hz
PVD-180
PVD-180B 0.4kW 1.13 1.14 1.15 1.03 1.04
PVD-360
PVD-360B 0.75kW 1.71 1.64 1.62 1.48
400V cLassMotor Poles：4P
Model Motor Rated current（A） ※1
* 1 Rated current are about standard motors. Should you use other motor, confirm the specific by
the motor nameplate.

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Table 5 Standard motor terminal size and protection circuit selection criteria
PVD-180
PVD-180B 0.4kW M4 M4 0.75mm2 5A 1.95A～
2.11A
PVD-360
PVD-360B 0.75kW M4 M4 1.25mm2 15A 3.02A～
3.36A
PVD-180
PVD-180B 0.4kW M4 M4 0.75mm2 3A 1.03A～
1.15A
PVD-360
PVD-360B 0.75kW M4 M4 1.25mm2 9A 1.48A～
1.71A
Motor
breaker or
Fuse
Thermal
relay※2
200Vclass
4P
400Vclass
4P
Voltage
Poles Model Motor Terminal screw※1
Earth
screw※1
Applicable
wire
gauge
* 1 Terminal size are about standard motors. Should you use other motor, confirm the specific by
the motor specification.
* 2 Rated current are about standard motors. Should you use other motor, confirm the specific
by the motor nameplate.
5) Fit the V-belt.
6) Connect the solenoid valve.（B-TYPE）
[Applied only for Type PVD-180B or -360B]
The electrical supply to the solenoid valve so called "Vac. Lock Valve" should be made
according to the specification which is printed on the nameplate attached to the solenoid valve.
Typical connection for 200V 3phase motor and for a 200V 2phase solenoid is shown below.
Fig. 12 Electrical wiring diagram for Vac. Lock Valve
Note: Separate wiring will eventually be required if you use a motor rated at different line voltage
and cycle from those for the solenoid. Make sure the proper voltage and current are
supplied to both motor and solenoid coil. Both may fail to operate if voltage is less than
90% or more than 110% of the rated.

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5. Connection with Vacuum System
1) Be sure that the inside of vacuum equipment, pipes and vacuum valves are clean and free from
excessive moisture or liquid, chips, dust, rust etc. before you connect the system with the pump.
Note: Breathing chips or visible dust will cause a mechanical trouble in the pump. Evacuating
excessive moisture will not only harmful for obtaining guaranteed ultimate pressure but also
may corrode the inside of the pump in the long run.
2) [PVD-180, PVD-360, PVD-180B and PVD-360B]
It is advisable to install a flexible connection (with vacuum grade rubber tubing or metal bellows)
between pump inlet and vacuum piping to eliminate vibration. Application of thin layer of high
vacuum grease at the joint will often be helpful for keeping vacuum tightness.
[PVD-180-H, PVD-360-H]
Connection with the flange to the pump Inlet, because the pump inlet is flange type. It is advisable
to install a flexible connection (with metal bellows) between pump inlet and vacuum piping to
eliminate vibration.
Note: A wire net (means suction filter) is provided within the suction port of the pump to prevent larger
solids from entering the pump. Do not take the wire net off. The net should be washed and
cleaned periodically according to your specific maintenance schedule.
3) Installation of a vacuum valve, a leak valve and a vacuum gauge between the equipment and
the vacuum pump is required for PVD-180 and PVD-360 as shown in Fig.13. When the pump
stops, shut the vacuum valve [A] to keep the equipment in vacuum, then open the leak-valve [B]
and let air into the pump to prevent from counter-flow of the rotary vacuum pump oil in the
pump.
4) It is advisable to install a flexible connection (with rubber tubing or metal bellows) between
pump intake and vacuum piping to eliminate vibration.
Fig. 13 Connection with Vacuum System for PVD-180, PVD-360
5) Connection as shown in Fig.14 and Fig.15 can be usable for PVD-180B and PVD-360B. In case
of Fig.14, almost the same connection as Type PVD-180 and PVD-360 except no leak valve. In
case of Fig.15, the equipment will be kept in vacuum by "Vac Lock Valve". The pressure-rise in
the equipment will not exceed 66.6Pa within 20 minutes after Shut off of the pump. The back
streaming of the pump liquid into the equipment will never occur but the pressure in the equipment
will reach atmospheric usually in a day.

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Fig. 14 Connection 1 with Vacuum System for PVD-180B, PVD-360B
Fig. 15 Connection 2 with Vacuum System for PVD-180B, PVD-360B
6) Installation of a vacuum valve, a leak valve and a vacuum gauge between the equipment and the
vacuum pump is required for PVD-180-H and PVD-360-H as shown in Fig.16. When the pump
stops, shut the vacuum valve [A] to keep the equipment in vacuum, then open the leak-valve [B]
and let air into the pump to prevent from counter-flow of the rotary vacuum pump oil in the pump.
Fig. 16 Connection with Vacuum System for PVD-180-H, PVD-360-H
7) Use the flexible hose for connection between the pump outlet and the duct.

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Ⅲ Operation
1. Pump Start
Re-check prescribed installations once more and operate your pump as shown Fig.13, PVD-180 and
PVD-360, in accordance with the following procedures to obtain the specific performance of the pump.
1) Close the vacuum valve [A] and open the leak valve [B].
2) Rotate your pump-pulley in the correct direction at least 2～3 revolutions by hand and Check the
smoothness of rotation.
3) Turn the motor-switch on.
4) Close the leak valve [B] and open the vacuum valve [A] when the pump is rotating at a constant
speed.
Note: This product is not made as the withstand pressure structure. Ensured pressure value of the
Pump shall be 0.03MPa (0.3kgf/cm2) (Gauge pressure). If any valve was put to a pipe after the
outlet, check and ensure that it is open. Too much clog would prevent the exhaust gas from
passing through, raise the pressure inside the pump and might result in breaking it.
Note: Immediately after starting operation, the current is high. After 1 hour from starting operation,
make sure that the current is below the rated current at the ultimate pressure
If the pump cannot be rotated smoothly by hand, follow the following steps.
1) Open the leak valve and rotate the pulley about 10 revolutions by your hand.
2) Check correct amount of charged oil.
3) If the pump does not rotate under the above procedures, contact the closest Service Center.
4) When the pump is kept running for several hours, the oil temperature in the case will rise , to
about 70℃at a room temperature around 60-65℃. If the oil temperature exceed 70℃when the
gas-ballast valve is kept closed, some troubles are suspected. Please stop the pump and contact
the closest Service Center.
Note: If the pump does not start rotating, the pump cylinder might be filled up with oil.
[Don't worry about this problem if you would use Type PVD-180B and PVD-360B].
2. Pump Stop
1) Close the vacuum valve [A] to system.
2) Stop the motor and break vacuum (open the leak valve [B] or the gas-ballast valve).
Note: Make sure the leak Valve or gas-ballast valve is opened when the pump is stopped or in case
of power failure, preventing the pump and vacuum system from being flooded with oil.
[Applied only for Type PVD-180B or -360B]
"Pump start", "Pump stop" procedures are almost the same as prescribed Ⅲ-1, Ⅲ-2. But, there
are some different points (*) which are very important in order to obtain the specific performance
of the pump, PVD-180B and PVD-360B.
1) * Make sure the Vac. Lock valve operates properly.
2) Operate the pump in accordance with the prescribed procedures Ⅲ-1.
3) * Run the pump for more than two hours under closing suction port.
4) * Open the gas-ballast valve more than 5 hours.
5) * And continue the running of the pump under closing the gas-ballast valve for more than 24
hours.
As the result, considerable gases can be taken out from oil in the pump by the above procedures.
And you are ready to evacuate your system.

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3. Gas-ballast Valve
This product is installed with the gas ballast function as standard. PVD-180-H, -360-H has no gas
ballast valve.
Breathed condensed gas shall be liquefied through the compress process of the Pump, mixed with
the Pump oil and then cycled mixed together inside the Pump unit. This status brings you the same
situation that you used the high steam pressure oil that raises the ultimate pressure. It also shortens
the life cycle of the Shaft seal since the oil lubrication shall deteriorate.
If introduced the air or dry nitrogen through the gas ballast valve just before the Pump compression
process, the condensed gas is not liquefied but exhausted with the air through the Exhaust valve.
To use the gas ballast, breathe in the air through the gas ballast valve before sucking in the
condensed gas and operate the Pump around twenty minutes; this is because the “gas ballast effect”
becomes larger as the Pump temperature is higher. Wait until the Pump temperature raises enough to
open the Vacuum Valve so as to operate the Pump. The “gas ballast effect” under low temperature
shall be lower than the specified process performance.
Note further that keeping the gas ballast valve open when not breathing in the condensed gas shall
cause the Pump oil splashing and power loss and further rise the ultimate pressure. You have to note
also that the condensed gas might remain in the Pump oil after you have exhausted a lot of condensed
gas or exhausted the condensed gas (air or gas that contains less water or other steam that
contaminates the oil) without opening the gas ballast valve since the process capacity of the condensed
gas by the gas ballast valve is limited.
In such a case, close the Main valve, breathe in the air through the gas ballast valve and idle operate
the Pump. Then the oil temperature shall rise up and be cleaned by means of the Gas ballast effect.
Keep on idle operating the Pump without opening the gas ballast valve as far as the specified ultimate
pressure is attained. You need to replace the Pump oil if it was not cleaned after operated long time.
Note: The Vacuum pump gets high temperature during operation. As the gas ballast valve also gets
high temperature, be sure to wear protective gear such as a pair of gloves.
Note: Ensure to close the gas ballast valve to start operating the Pump. The oil might jet out of the gas
ballast valve during the operation around high pressure range.
Note: The guaranteed pressure resistance of this pump is 0.03 MPa (0.3 kg / cm2) (gauge pressure).
Operate the supply pressure of the gas ballast gas to be introduced within the following range.
Supply pressure: Atmospheric pressure to 0.03 MPa (0.3 kg / cm2 (gauge pressure)) or less.
4. Vacuum Pump Oil ULVOIL R-42 for Winter Use
In winter, if the pump could not be started easily, check the following points carefully. [Belt-tension,
Motor fuse, smoothness of rotation of the pump, etc.]. In spite of normal behavior for the check points,
if the pump could not be started easily, please replace oil to ULVOIL R-42.
Note: It is better to use the ULVOIL R-42 having less viscosity that enables you to start rotating the
Pump around 4℃. Replace it with the ULVOIL R-72 if the temperature gets 10℃or more. Be
cautious as using the ULVOIL R-42 in warm season would cause such troubles as sealing error,
oil leak or more serious trouble, due to its lower viscosity.
Note: ULVOIL R-42 is unfitted for high load operation. When performing the high load operation, use
ULVOIL R-72, and either warm the Pump oil or perform the Pump jog at several times, and start it
up.