Bentone BENTOFLEX ST 146 B30A Technical specifications

Providing sustainable energy solutions worldwide
178 135 19-2 CR00664 2023-05-15
Installation- and maintenance instruction
ST 146 B30A
LMO24.255C2E
AS 47 CK
Translation of the original instructions.

2Bentone
example Beispielexempel
352011030141
Designation
Type
Model
Serial no.
Motor supply
Main supply
MADE IN SWEDEN BY
LIGHT OIL 35-90kW 1,25-6,0 cSt 7-14bar
BF 1 KS 76-24
BF 1
BF 1 KS 76-24
1234567
1~230V 1,0A 50Hz IP 20
Man.Year 2019
Cap. Min-Max
3
?
1
-sv
1. Manualer på övriga språk
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nedladdning eller scanna
QR-koden.
3. Skriv in brännarens
artikelnummer som  nns på
din typskylt (se bild) och välj
ditt språk.
Detaljerad ecodesign
information kan laddas ner
på: www.bentone.com/
ecodesign.
-en
1. Manuals in other languages
2. www.bentone.com\
download or scan QR-code.
3. Enter the burner`s article
number on your data plate
(see picture) and select
language.
Detailed ecodesign
information can be
downloaded at:
www.bentone.com/
ecodesign.
-da
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2. www.bentone.com\
download eller scan
QR-koden.
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-fr
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2. www.bentone.com\
download ou scannez le
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2

3Bentone
Table of contents
1. General Information............................................................4
1.1 Delivery inspection........................................................................ 4
1.2 Safety ............................................................................................... 4
2. Technical data.......................................................................6
2.1 Dimensions ST 146 B30A ............................................................ 6
2.2 Workingeld.................................................................................. 7
2.3 Basic settings................................................................................. 7
2.5 Settingofignitionelectrodesand
brake plate...................................................................................... 8
2.4 Technicalspecication ................................................................. 8
2.6 Nozzleandpumppressure......................................................... 9
2.7 Nozzle table.................................................................................... 9
2.8 Components................................................................................. 10
3. Electric equipment.............................................................11
3.1 Safety system .............................................................................. 11
3.2 Wiringdiagram............................................................................ 11
3.3 Function ........................................................................................ 12
3.4 Colourcodes................................................................................ 13
3.5 Faultcodes ................................................................................... 13
4. Installation..........................................................................14
4.1 Generalinstructions................................................................... 14
4.2 Inspectionandmaintenance.................................................... 14
4.3 Start-up ......................................................................................... 14
4.4 Preparing for installation........................................................... 14
4.5 Oildistribution............................................................................. 14
4.6 Electrical connection .................................................................. 15
4.7 Mounting ...................................................................................... 16
5. Settings ...............................................................................17
5.1 Example of basic setting............................................................ 17
6. Pump ..................................................................................19
6.1 SUNTEC AS .................................................................................. 19
7. Service .................................................................................25
7.1 BurnerServiceSchedule,Oil .................................................... 25
7.2 Component replacement intervals.......................................... 25
7.3 Combustiondevice ..................................................................... 26
7.4 Replacing the preheater............................................................ 27
7.5 Replacingtheoilpump.............................................................. 28
7.6 Replacingthefanmotorandfanwheel................................. 29
7.7 Airintakeandintakecone......................................................... 30
7.8 Replacing the entire electrical package ................................. 30
7.9 Replacingindividualelectricalpackagecomponents ......... 31
8. Fault Location.....................................................................32
8.1 Burnerwillnotstart.................................................................... 32
8.2 Burnerwillnotstartafternormaluse .................................... 32
8.3 Delayedignition .......................................................................... 33
8.4 Noiseinpump ............................................................................. 33
8.5 Pumppressure ............................................................................ 34
9. Logofuegasanalysis.....................................................35

4Bentone
165 105 01-2 2021-12-07
1. General Information
The burner may only be used for its intended purpose in accordance with the
product’s technical data.
We reserve the right to make design changes and cannot be held liable for any
misprints or typographical errors.
Modifying the design or using accessories or components that have not been
approved by Enertech in writing is strictly prohibited.
This Installation and Maintenance manual:
• is to be regarded as part of the burner and must always be kept near
the installation site.
• must be read prior to installation.
• is intended for use by authorised personnel.
1.1 Delivery inspection
• Make sure everything is delivered and the goods have not been
damaged during transit.
Transport damage must be reported to the shipping company.
• If something is wrong with a delivery, report it to the supplier.
1.2 Safety
- before installation:
• Installation and work on the burner and associated system
components may only be carried out by persons who have undergone
relevant training.
• The product is packaged to prevent damage from occurring when
handled – Handle the product with care! Lifting equipment must be
used to lift larger packages.
• The products must be transported/stored on a level surface in a dry
environment, max. 80% relative humidity, no condensation.
Temperature -20 to +60 °C.
- installation:
• The burner must be installed in accordance with local regulations for
 re safety, electrical safety, and fuel distribution.
• The premises must comply with local regulations pertaining to use of
the burner, and must have adequate air supply.
• The installation site must be free of chemicals.
• Fire extinguisher with Class BE recommended.
• Make sure when installing the burner that there is enough space to
service the burner.
• The electrical installation must be professionally carried out in
accordance with current mains electricity regulations and in a
professional manner.
• Make sure that the burner is suitable for the application (see Technical
Data).
• All components must be installed without being bent, twisted or
subjected to mechanical or thermal forces that affect components.

5Bentone
• Care must be taken by the installer to ensure that no electrical cables
or fuel lines are pinched or otherwise damaged during installation or
service.
• Flame tubes, fan wheels and air dampers, for example, may contain
sharp edges.
- before  rst start:
• The burner must not be put into operation without proper safety and
protection devices.
• Permitted ambient temperature during operation -10 to +60 °C. Max.
80% relative humidity, no condensation.
• The surface temperature of the burner’s components may exceed
60 °C.
• Handle with caution – the burner has moving parts, and there is risk
of crushing injuries.
• Seal inspections must be performed during installation and servicing
to prevent leakage.
•  tting and installation work has been completed and approved.
• electrical installation has been correctly performed.
•  ue gas ducts and combustion air ducts are not blocked.
• all actuators and control and safety devices are in working order and
correctly set.
• If the boiler is equipped with an access hatch, this must be equipped
with a hatch opening switch connected to the burner’s safety system.
• When in operation, the burner’s noise level can exceed 85 dBA – use
hearing protection!
- Operation:
• Carry out all stipulated settings, service and inspection work within
the set time.
• If the oil burner control has a solid red light, contact your installer.

6Bentone
165 205 30-3
2. Technical data
The burner is intended for:
• Operation in installations according to EN 303 and EN 267.
When operating with a hot air boiler, the LMO24.255 or LMO44.255 control unit must be used.
Fuels:
• Fuel oil according to DIN 51603-1.
• Fuel oil A Bio 10 according to DIN 51603-6.
2.1 Dimensions ST 146 B30A
* Min. recommended distance to  oor.
2.1.1 Dimensions,  anges
C
A
øB
D
F
E
H
G
Ø B C D E F G H *I
109 237 202 54 258 158 295 200
Length of fl ame
tube
Measurement A
Flange 1
163 140
263 240
10,5
12
145-172
ø109,5
Flange 1

7Bentone
d1
d2
d3
2.1.2 Hole patten
Check that the hole pattern on the boiler is suitable for the xing ange.
-
0,5
0,0
0,5
1,0
1,5
2,0
2,5
50 60 70 80 90 100 110 120 130 140 150 160
mbar
kW
5.0-13.3 kg/h
60-157 kW
160302-684
2.2 Working eld
d1 d2 d3
ø 110 10 ø 140-170
!Do not exceed the
working area.
2.3 Basic settings
0
4
8
12
16
20
24
28
32
50 60 70 80 90 100 110 120 130 140 150 160
160302-682-2
kW
Air settings
Nozzle assembly
Scale
Burner output

8Bentone
ab c
7.5-9.5 2.0-3.0 3.0-4.0
!*NB It is important
that the spark does not
strike against the brake
plate or nozzle
2.5 Setting of ignition electrodes and
brake plate
ST 146 B30A
Main supply 1) 230V, 1~, 1.2/1.3A, 50/60Hz, IP20
Max fuse rating 6.3A
Elmin preheater excluded 0.74A, 165W
Elmax preheater excluded 0.81A, 190W
PSB 0
NOX-class 2
Noise level 78dBA
1) Max operating current, see data plate.
a
bc
2.4 Technical specication
Measurements according to EN 15036-1:2006
Alt.1 The noise level of the burner can be reduced by equipping the burner
with silencer. Installation must be done so it does not prevent air supply
to the burner.
Alt.2 The burner’s noise level can be reduced by connecting the burner’s air
intake to the air duct that opens into an appropriate location. Installation
must be done so it does not prevent air supply to the burner.

9Bentone
2.6 Nozzle and pump pressure
Due to different furnace geometries and capacities, it is not possible to
recommend a nozzle model.
Nozzle 60° Solid/Hollow cone
80° Solid/Hollow conel
Pump pressure 10 bar (8–14 bar) Fuel oil 1
10 bar (7–12 bar) Kerosene
2.7 Nozzle table
Pump pressure, bar
Gph 89 10 11 12 13 14 15
kg/h kW kg/h kW kg/h kW kg/h kW kg/h kW kg/h kW kg/h kW kg/h kW
0,40 1,33 16 1,41 17 1,49 18 1,56 18 1,63 19 1,70 20 1,76 21 1,82 21
0,50 1,66 20 1,76 21 1,86 22 1,95 23 2,04 24 2,12 25 2,20 26 2,28 27
0,60 2,00 24 2,12 25 2,23 26 2,34 28 2,45 29 2,55 30 2,64 31 2,73 32
0,65 2,16 26 2,29 27 2,42 29 2,54 30 2,65 31 2,75 33 2,86 34 2,96 35
0,75 2,49 29 2,65 31 2,79 33 2,93 35 3,08 36 3,18 38 3,30 39 3,42 40
0,85 2,83 33 3,00 36 3,16 37 3,32 39 3,47 41 3,61 43 3,74 44 3,87 46
1,00 3,33 39 3,53 42 3,72 44 3,90 46 4,08 48 4,24 50 4,40 52 4,56 54
1,10 3,66 43 3,88 46 4,09 48 4,29 51 4,48 53 4,67 55 4,84 57 5,01 59
1,20 3,99 47 4,24 50 4,47 53 4,68 55 4,89 58 5,09 60 5,29 63 5,47 65
1,25 4,16 49 4,40 52 4,65 55 4,88 58 5,10 60 5,30 63 5,51 65 5,70 68
1,35 4,49 53 4,76 56 5,02 59 5,27 62 5,50 65 5,73 68 5,95 70 6,15 73
1,50 4,98 59 5,29 63 5,58 66 5,85 69 6,11 72 6,36 75 6,60 78 6,83 81
1,65 5,49 65 5,82 69 6,14 73 6,44 76 6,73 80 7,00 83 7,27 86 7,52 89
1,75 5,82 69 6,18 73 6,51 77 6,83 81 7,14 85 7,42 88 7,71 91 7,97 94
2,00 6,65 79 7,06 84 7,45 88 7,81 93 8,18 97 8,49 101 8,81 104 9,12 108
2,25 7,49 89 7,94 94 8,38 99 8,78 104 9,18 109 9,55 113 9,91 117 10,26 122
The table applies to oils with a viscosity of 4.4 mm2/s (cSt) at a density of 830 kg/m3.
2.7.1 Burner with preheater
Allow for a reduction in oil quantity of 5–20% with preheating owing to:
• Temperature increases at the nozzle.
• Nozzle design.
• Capacity (the higher the capacity the lower the difference).

10 Bentone
2.8 Components
1. Reset button
2. Burner control
3. Ignition transformer
4. Ignition cables
5. Nozzle assembly
6. Nozzle
7. Brake plate
8. Flame tube
9. Ignition electrodes
10. Connecting pipe
11. Air damper
12. Solenoid valve
13. Pump
14. Drive coupling
15. Indication, air damper
16. Fan wheel
17. Adjustment, air damper
18. Flame detector
19. Motor
1 2 3 4 5 6 7
8
9
10
11
12
13
1417 151619 18

11Bentone
165 205 56-2
3. Electric equipment
3.1 Safety system
The safety system (safety switch for hatches, doors, water level, pressure, temperature
and other safety devices) must be installed in the safety circuit in accordance with
current regulations for the system.
The cables of the safety system must be separated so that the outgoing signal is not
placed in the same cable as the incoming signal.
3.2 Wiring diagram
Alt. 1
According to DIN 4791
Alt 2 Alt 3 Alt 4
E106282
Bk Black
Bn Brown
Bu Blue
Gn Green
Gn/Ye Green/Yellow
Gy Grey
Og Orange
Pk Pink
Rd Red
Vt Violet
Wh White
Ye Yellow

12 Bentone
Svart
-
+
QRB
12
11
Black Schwarz Noir
A1
DC μA
1 Switch on operating switch and twin thermostat
A spark is formed. The air damper motor opens the damper to low load
position. The burner motor starts, the prepurge goes on till the prepurge
period expires and the solenoid valve 1 opens (2).
2. Solenoid valve 1 opens
Oil mist is formed and ignited. The photocell indicates a ame. The
ignition spark goes out after ame indication (See Technical data oil
burner control).
3.
a
b
The safety time expires
If no ame is established before this time limit the control cuts out.
If for some reasons the ame disappears after this time limit, the burner
will make an attempt to re-start.
4 High/Low thermostat ON
The burner is in operating position and can now change between full load
and low load.
4-5 Operating position
If the burner operation is interrupted by means of the main switch or the
thermostat, a new start takes place when the conditions in accordance
with point 1 are fullled.
The oil burner control cuts out
A red lamp in the control is lit. Press the reset button and the burner
re-starts.
A1 Burner control
E1 Preheater
E2 Burner without preheater
F1 Fuse
H1 Lamp, low capacity
M1 Motor
P1 Time meter, low capacity
(optinal)
R1 Flame detector, QRB
S3 Control thermostat
S4 Temperature limiter
S7 Main switch
T1 Ignition transformer
U2 UV-cell, QRC
X3 Plug-in contact, burner
X4 Plug-in contact, boiler
Y1 Solenoid valve
!Mains connection and fuse
in accordance with local
regulations.
3.3.1 Technical data
LMO14.113... LMO24.255...
15 s 25 s
16 s 26 s
3 s 5 s
< 10 s < 5 s
< 1 s < 1 s
< 1 s < 1 s
-5 - +60°C -20 - +60°C
45 µA dc 45 µA dc
5.5 µA dc 5.5 µA dc
160303-333
Preiginition time
Prepurge time
Postignition time
Safety lockout time
Reset time after lockout
Reaction time on  ame failure
Ambient temperature
Min detector current required (with  ame)
Max perm. detector current (without  ame)
3.3 Function
3.2.1 Components

13Bentone
3.4 Colour codes
When the burner starts, the light in the reset switch indicates the normal
sequence, and also indicates whether something abnormal is happening as
per the following table:
Preheater in operation Solid yellow
Ignition switched on Flashing yellow
Normal operation Solid green
Operation, poor ame signal Flashing green
Undervoltage Flashing yellow-red
Fault, alarm Solid red
False light Flashing red-green
Communication mode Fluttering red
3.5 Fault codes
When the red light for a blocked relay box comes on, you can get information
about what has caused the problem by pressing and holding the reset button
for 3 seconds.
The number of ashes below is repeated with a pause in between.
2 ashes No ame signal when safety time expires
4 ashes False light during start
7 ashes 3 x Losses of ame during operation
8 ashes Time-out for preheater *
10 ashes Incorrect wiring, internal fault or simultaneous occurrence
of two faults
* In order for this fault code to occur, the preheater shall not reach its cut-off
temperature within 10 mins. from switch on.
To return to normal operation: Press the reset button for 1 second.
If the reset button is instead kept pressed a second time for at least 3 seconds,
you can, via an interface, obtain the corresponding information on a computer
or ue gas analyser.
To return to normal operation: Press the reset button for 1 second.

11Bentone
165 205 19-3
3. Installation
3.1 General instructions
Oil burners must be installed in accordance with local regulations. The installer
must therefore be knowledgeable of the regulations pertaining to oil and
combustion.
Only oil suitable for the burner must be used and then in combination with a
suitable oil lter installed before the burner’s oil pump.
If the burner is replacing an existing burner, ensure that the oil lter is
replaced or cleaned. Installation may only be performed by qualied
personnel.
Care should be taken by the installer to ensure that electrical cables and oil
lines are not pinched or otherwise damaged during installation or servicing.
3.2 Inspection and maintenance
The system must be maintained at the interval specied in the service
schedule. If the burner is in a dirty environment, service should be done at
more frequent intervals.
3.3 Start-up
In order to obtain the correct setting, a ue gas analysis and temperature
measurement must be carried out. Otherwise, there is a risk of soot build up,
poor eciency or condensation in the chimney. The system must be ne-tuned
at start-up. The temperature in the chimney at a depth of 0.5 m must be at
least 60 °C to prevent condensation.
3.4 Preparing for installation
Check that the burner’s dimensions and capacity range are suitable for the
relevant boiler. The power data on the rating plate refers to the burner’s
minimum and maximum power.
3.5 Oil distribution
In order to achieve good reliability, it is important that the oil distribution
system is designed correctly.
Take the following into account:
• Selection of pipe diameter, pipe length and height difference; see
Pump instruction.
• Pipelines are to be laid with the fewest possible number of glands.
• The pipes are to be laid so that the oil supply hoses are not subjected
to tensile stresses or become excessively bent when the burner is
swung out or removed for servicing.
• The oil lter should be installed so that the lter cartridge can easily
be replaced or cleaned.
• Parts in contact with oil must be selected in materials that are capable
of withstanding the medium’s physical properties.
• When installing oil hoses, check that the inlet and return hoses are
tted to the appropriate connection on the oil pump. The hoses must
be located so that they do not bend or become subject to tensile load.
• Bleed the oil system. The oil pump/oil preheater may be damaged if
run dry. The vacuum in the suction line should not fall below 0.3 bar
during start-up.
!Besuretollthe
burneroilsystem
before starting it for the
rsttime.
!Theoilltermustbe
installed before the
burner’s oil pump.

12 Bentone
!Ifanyelectricalconnectionisusedotherthanthat
recommendedbyEnertech,theremaybeariskofdamageto
propertyandpersonalinjury.
3.6 Electrical connection
• Before work on the electrical connection, the current must be
disconnected so that the installation is isolated.
• Electrical connection must be done in accordance with the applicable
regulations.
• Burners must be connected to an all-pole switch.
• Connection must conform to the wiring diagram.
• Use appropriately sized fuses.

13Bentone
165 205 20
A
Return Supply
3.7 Mounting
3.7.1 Hole pattern
Make sure the hole pattern on the burner corresponds to the supplied  ange,
(see Technical data).
3.7.2 Burner installation
1. Install the  ange with gasket on the boiler.
2. Fit the selected nozzle, (see Technical data).
3. Install the brake plate and check the ignition electrodes, (see Burner
Servicing).
4. Mount the burner to the  ange.
5. Insulate between the burner and boiler door to reduce radiated heat
(if necessary).
3.7.3 Oil lines
1. Check the dimensions of the oil lines, (see Pump instructions).
2. The oil  lter should be  tted to the incoming oil line. If a degasser is
installed, the oil  lter should be  tted to the oil line up to the degasser
in order to prolong the service life of the oil  lter.
3. For single pipe systems, the return plug must be removed, (see Pump
instructions).
4. When installing oil hoses, check that the supply and return hoses are
 tted to the appropriate connection on the oil pump. The hoses must
be located so that they do not bend or become subject to tensile load.
5. Bleed the oil system. Dry running will damage the oil pump.
6. The vacuum in the suction line should not fall below 0,3 bar during
start-up.
3.7.4 Electrical connection
If the boiler does not have a pre- tted connector, connect to the supplied
connectors (x2) as shown in the wiring diagram.
1. Switch off the main switch.
2. Connect the Europlugs (x2) as shown in the wiring diagram.
3. Fit the Europlugs (x2) to the burner.
4. Turn on the main switch.
3.7.5 Check oil line seals
Once the burner has been installed and commissioned, the seals of the various
coupling elements should be checked.
When a leak is detected, it is usually su cient to tighten the coupling element
that is leaking.
X1
X2

14 Bentone
165 205 31-3
4. Settings
4.1 Example of basic setting
ST 146 B30A
Burner output: 120 kW
Estimated nozzle output: 120 / 11.86* =10.12 kg/h
(* Calorc value Fuel oil =11.86 kWh/kg)
This provides the following nozzle according to the nozzle table, (see Technical
data).
Nozzle: 2.25 Gph
Pump pressure: 14.5 bar
Setting values for 120 kW according to basic setting diagram, (see Technical
data).
Air setting: = 22.5
Insert setting: =19.0
ST 146 B30AV
Burner output: 120 kW
Output increase, for burners with
preheater:
120 x 1.06 =127 kW
Estimated nozzle output: 127 / 11.86* =10.71 kg/h
(* Calorc value Fuel oil =11.86 kWh/kg)
This provides the following nozzle according to the nozzle table, (see Technical
data).
Nozzle: 2.75 Gph
Pump pressure: 11.0 bar
Setting values for 120 kW according to basic setting diagram, (see Technical
data).
Air setting: = 22.5
Insert setting: =19.0

15Bentone
4.1.1 Insert control
The burner is equipped with a lever that changes the position of the brake
plate in the burner tube. This is used to set the correct pressure drop across
the combustion assembly, thereby obtaining good combustion without
pulsation.
The setting to be used depends on, among other things, the output settings
and overpressure in the boiler
Setting the brake plate
• Small column: turn the screw left
• Large column: turn the screw right
Setting the brake plate position affects air ow. Therefore, it is always necessary
to  ne-tune air ow using the burner’s air ow regulator.
4.1.2 Air intake adjustment
Setting the air intake is very important to achieve good combustion with
neither too much nor too little air. To adjust the combustion air ow, turn the
air ow regulator lever using an Allen key. The extent to which the air ow lever
must be open is determined by the heat output and overpressure in the boiler
as well as other settings on the burner such as the position of the brake plate.
4.1.3 Setting the air quantity
Turn the air intake clockwise to increase air ow and anticlockwise to decrease
air ow.
Insert control
Air control

19Bentone
6. Pump
6.1 SUNTEC AS
Technical data AS47CK
One or two-pipe system
Viscosity range: 1-12 mm2/s
Pressure range: 7-14 bar
Rated voltage of coil: 220/240V 50/60 Hz
Oil temperature: max 60°C
Components
1. Suction line G 1/4”
2. Return line G 1/4”and internal
by-pass plug
3. Nozzle outlet G 1/8”
4. Pressure gauge port G 1/8”
5. Vacuum gauge port G 1/8”
6. Pressure adjustment






Technical data AS67C
One or two-pipe system
Viscosity range: 1-12 mm2/s
Pressure range: 10-15 bar
Rated voltage of coil: 220/240V 50/60 Hz
Oil temperature: max 60°C
165 105 20-2

20 Bentone
Applications for SUNTEC AS
The SUNTEC AS oil pump has a built in solenoid valve
which controls the regulator cut-off valve giving fast
cut-off and cut-on function independent of the rotational
speed.
Applications
Light oil, B10 heating oil/biofuel blend (as dened in DIN
V51603-6) and kerosene.
- One or two-pipe system.
Pump operating principle
The gear set draws oil from the tank through the built-in
lter and transfers it to the valve that regulates the oil
pressure to the nozzle line. All oil that does not go through
the nozzle line will be dumped through the valve back to
the return line in two pipe installation or, if it is a one-pipe
installation, back to suction port in the gear set.
In that case, the by-pass plug must be removed from the
return port, and the return port sealed by steel plug and
washer.
The solenoid valve of the AS pump is of the ”normally
opened” type.
When the solenoid valve is non-activated, the by-pass
channel between the pressure and return sides of the
valve is open. No pressure will then be built up to open the
valve; it does not matter which speed the gear set has.
When the solenoid is activated, this by-pass channel is
closed and because of the full speed of the gear set, the
pressure necessary to open the valve will be built up very
rapidly, which gives a very sharp cut-on function.
Cut-o
When the burner stops, the solenoid opens the by-pass
at the same moment, which drains all the oil down to the
return, and the nozzle valve closes immediately.
This gives a very sharp cut-off function. The cut-on and
cut-off can be actuated regardless of motor speed and
have an extremely fast response.
When the solenoid is not activated, the torque
requirement is low up to full motor speed.
Bleeding
Bleeding of pumps with two-pipe systems takes place
automatically, but bleeding can be accelerated by opening
a pressure port.
On pumps with a single-pipe system, a pressure port must
be opened to empty the system of air.
Solenoid valve
open
Solenoid
valve closed
To nozzle
Pressure
adjustment
Shaft sealBack to
suction
By-pass plug
inserted
By-pass plug
removed
Pressure gauge ports
Vacuum gauge
port
Return plugged Return Inlet
One pipe installation Two pipe installation
Gear-set
Oil under suction
Oil under pressure
By-passed oil
returned to tank,
or to suction