Ferroli Domina Oasi F 24 E User manual

DOMINA OASI F 24-30 E FERELLA BOIL F 24-30 MEL KEA AIR COMPACT E
Wall-Mounting
Gas Boiler
Airtight Chamber,
for Heating and Hot
Water with
Integrated Boiler
TECHNICAL
MANUAL
•
•
EDITION
09•2002

2
DOMINA OASI F 24 - 30 E
FERELLA BOIL F 24 - 30 MEL
KEA AIR COMPACT E
Version - 09.2002
1. Technical characteristics and data ........................................................... 3
1.1 Introduction .............................................................................................................. 3
1.2 Dimensions and connections .................................................................................. 4
1.3 General view and main components ....................................................................... 8
1.4 Technical data table ............................................................................................... 10
2. Product framework and internal components ........................................11
2.1 Hydraulic circuit - heating ...................................................................................... 11
2.2 Hydraulic circuit - tap water ................................................................................... 15
2.3 Gas circuit ............................................................................................................. 17
2.4 Burner unit ............................................................................................................. 21
2.5 Fume circuit .......................................................................................................... 23
2.6 Electrical circuit ..................................................................................................... 27
3. Operation................................................................................................... 30
3.1 Operating principle ................................................................................................ 30
3.2 Operating diagram................................................................................................. 31
3.3 Control panel ......................................................................................................... 32
3.4 Adjustments ........................................................................................................... 32
3.5 Setting operating parameters ................................................................................ 33
4. Troubleshooting ....................................................................................... 34

3
DOMINA OASI F 24 - 30 E
FERELLA BOIL F 24 - 30 MEL
KEA AIR COMPACT E
Version - 09.2002
1. GENERAL TECHNICAL CHARACTERISTICS
AND DATA
1.1 Introduction
Our appliance is a high-efficiency heat generator for central heating and hot-water production running on natural
gas or LPG (configurable at the time of installation).
The boiler shell consists of a copper laminar exchanger whose particular shape guarantees high exchange
efficiency under all operating conditions and an open-flue burner equipped with electronic ignition and
ionization flame control.
The boiler is totally sealed off from the installation room: the air needed for combustion is drawn from outside
and the flue gases are expelled by a fan. The boiler outfit moreover includes a stainless steel boiler of 55 or
65 litres for tap water, a variable speed circulator and a fixed speed circulator, an expansion tank for heating
and for the boiler, safety valve, filler cock, air pressure switch, water pressure switch, temperature sensors,
limiting and safety thermostats.
Thanks to the control and adjustment system, unit operation is for the most part automatic. The power for
heating is automatically governed by the control system according to the indoor characteristics, the
characteristics of the building and of its location. The tap water capacity is ensured by a boiler that is kept
at the required temperature.
There are 5 LEDs on the control panel providing information on the unit's operating status.
General Warnings
• Installation and maintenance must be carried out by professionally qualified personnel,
according to current regulations and the manufacturer's instructions.
• Incorrect installation or poor maintenance can cause damage or physical injury. The
manufacturer declines any responsibility for damage caused by errors in installation and
use or by failure to follow the manufacturer's instructions given in the instructions manual.
• Before carrying out any cleaning or maintenance operation, disconnect the unit from the
electrical power supply using the switch and/or the special cut-off devices.
Certification
The CE marking demonstrates that Ferroli gas units conform to the requirements contained in the
applicable European directives.
In particular, this unit complies with the following EU directives:
•Gas Appliance Directive 90/396 assimilated with Italian Presidential Decree DPR 15.11.96 no. 661
•Efficiency Directive 92/42 assimilated with Italian Presidential Decree DPR 15.11.96 no. 660
•Low Voltage Directive 73/23 (amended by 93/68)
•Electromagnetic Compatibility Directive 89/336 (amended by 93/68) assimilated with Italian
Presidential Decree DPR 15.11.96 no. 615

4
DOMINA OASI F 24 - 30 E
FERELLA BOIL F 24 - 30 MEL
KEA AIR COMPACT E
Version - 09.2002
1.2 Dimensions and connections
Domina Oasi F 24 E version
600
370
800
810
570
85 285
75 85
90
85
80
80
85
120 55 170 100 65 55
35
123 456
Key
1Gas inlet
23/4" System delivery
33/4" System return
41/2”Hot tap water
51/2”Cold tap water
61/2”Outlet/Recirculation
Top view
Bottom view

5
DOMINA OASI F 24 - 30 E
FERELLA BOIL F 24 - 30 MEL
KEA AIR COMPACT E
Version - 09.2002
Ferella Boil F 24 MEL version
& Kea Air Compact E version
600
370
800
810
570
85 285
75 85
90
85
80
80
85
120 55 170 100 65 55
35
123 456
Key
1Gas inlet
23/4" System delivery
33/4" System return
41/2”Hot tap water
51/2”Cold tap water
61/2”Outlet/Recirculation
Top view
Bottom view

6
DOMINA OASI F 24 - 30 E
FERELLA BOIL F 24 - 30 MEL
KEA AIR COMPACT E
Version - 09.2002
Domina Oasi F 30 E version
600
450
800
810
570
85 365
75 85
90
85
80
80
85
120 55 170 100 65 55
35
123 456
Key
1Gas inlet
23/4" System delivery
33/4" System return
41/2”Hot tap water
51/2”Cold tap water
61/2”Outlet/Recirculation
Top view
Bottom view

7
DOMINA OASI F 24 - 30 E
FERELLA BOIL F 24 - 30 MEL
KEA AIR COMPACT E
Version - 09.2002
Ferella Boil F 30 MEL version
600
450
800
810
570
85 365
75 85
90
85
80
80
85
120 55 170 100 65 55
35
123 456
Key
1Gas inlet
23/4" System delivery
33/4" System return
41/2”Hot tap water
51/2”Cold tap water
61/2”Outlet/Recirculation
Top view
Bottom view

8
DOMINA OASI F 24 - 30 E
FERELLA BOIL F 24 - 30 MEL
KEA AIR COMPACT E
Version - 09.2002
Key
5Airtight chamber
7Gas inlet
8Tap water outlet
9Tap water inlet
10 System delivery
11 System return
14a 3-bar safety valve (heating)
14b 7-bar safety valve (boiler)
16 Fan
19 Combustion chamber
20 Burner assembly
21 Main nozzle
22 Burner
26 Combustion chamber insulation
27 Copper exchanger for heating and tap
water
28 Fume manifold
29 Fume outlet manifold
32 Heating circulator
34 Delivery temperature sensor
36 Automatic air vent
40 Tap water expansion tank
43 Air pressure switch
44 Gas valve
49 Safety thermostat
50 Heating thermostat
56 Expansion tank for heating system
63 Heating temperature setting
74 Heating system cock
81 Ignition electrode
82 Detection electrode
84 1st gas valve operator
85 2nd gas valve operator
90 Fume detection point
91 Air detection point
97 Magnesium anode
98 Off-On-Reset switch
114 Water pressure switch
130 Boiler circulator
132 Fume deflector
145 Water gauge
151a Boiler drain cock
151b System drain cock
155 Boiler temperature sensor
157 Tap water temperature setting
179 Check valve
180 Boiler
187 Fume diaphragm
192 Recirculation (when connecting, insert a
T-junction to connect the drain cock)
1.3 General view and main components
F 24 E/MEL version
0
5
1
234
6
145
179
16 43 563629 187
28
91
90
27
50
49
19
81
82
26
22
20
5
21
114
44
85
84
130
7 14a 10 11 32 74 8180 9
34
40
155
132
192 14b
98 63 157
97 151a 151b
DOMINA OASI –FERELLA BOIL
KEA AIR COMPACT E version

9
DOMINA OASI F 24 - 30 E
FERELLA BOIL F 24 - 30 MEL
KEA AIR COMPACT E
Version - 09.2002
F 30 E/MEL version
145
0
5
1
234
6
179
16 43 56 3629 187
28
91
90
27
50
49
19
81
82
26
22
20
5
21
114
44
85
84
130
7 14a 10 11 32 180
34
40
155
132
98 63 157
9
74 8 14b97 192 151a
151b
DOMINA OASI - FERELLA BOIL Version
Key
5Airtight chamber
7Gas inlet
8Tap water outlet
9Tap water inlet
10 System delivery
11 System return
14a 3-bar safety valve (heating)
14b 7-bar safety valve (boiler)
16 Fan
19 Combustion chamber
20 Burner assembly
21 Main nozzle
22 Burner
26 Combustion chamber insulation
27 Copper exchanger for heating and tap
water
28 Fume manifold
29 Fume outlet manifold
32 Heating circulator
34 Delivery temperature sensor
36 Automatic air vent
40 Tap water expansion tank
43 Air pressure switch
44 Gas valve
49 Safety thermostat
50 Heating thermostat
56 Expansion tank for heating system
63 Heating temperature setting
74 Heating system cock
81 Ignition electrode
82 Detection electrode
84 1st gas valve operator
85 2nd gas valve operator
90 Fume detection point
91 Air detection point
97 Magnesium anode
98 Off-On-Reset switch
114 Water pressure switch
130 Boiler circulator
132 Fume deflector
145 Water gauge
151a Boiler drain cock
151b System drain cock
155 Boiler temperature sensor
157 Tap water temperature setting
179 Check valve
180 Boiler
187 Fume diaphragm
192 Recirculation (when connecting, insert a
T-junction to connect the drain cock)

10
DOMINA OASI F 24 - 30 E
FERELLA BOIL F 24 - 30 MEL
KEA AIR COMPACT E
Version - 09.2002
1.4 Technical data table
Gas supply Pmax Pmin
Heating Power (Net Heat Value - Hi)
Useful Heating Power 80˚C - 60˚C
Hot Water Heating Power
Powers Pmax Pmin
kcal/h 20,200 8,300
kW 23.5 9.7
kcal/h 20,200 8,300
kW 23.5 9.7
kcal/h 22,200 9,900
kW 25.8 11.5
Dimensions, weights connections
Depth mm 370
Width mm 600
Height mm 800
Hot water
Minimum working pressure in hot water production bar 0.25
Maximum working pressure in hot water production bar 9
Specific flow rate with ∆t 30˚C l/10 min 150
Specific flow rate with ∆t 30˚C l/min 15
Boiler water content litres 1.5
Expansion tank pre-filling pressure bar 1
Expansion tank capacity litres 6
Minimum working pressure in heating bar 0.8
Maximum working pressure in heating bar 3
Maximum working temperature in heating ˚C 90
Electrical protection rating IP 44
Power voltage/frequency V/Hz 230/50
Max electrical power absorbed W 125
Hot water circuit connections inches 1/2”
Heating system connections inches 3/4”
Gas system connection inches 1/2”
Weight with packing kg 52
Heating
Natural Gas delivery (G20) nm
3
/h 2.73 1.22
Natural Gas main nozzles (G20) mm 12 x 1.30
Pressure at Natural Gas burner (G20) mbar 11.8 2.5
Natural Gas supply pressure (G20) mbar 20.0
LPG burner (G31) Kg/h 2.00 0.89
LPG main nozzles (G31) mm 12 x 0.77
Pressure at LPG burner (G31) mbar 35.0 7.8
LPG supply pressure (G31) mbar 37.0
Safety valve bar 3
Hot water content litres 55
Pmax Pmin
Pmax Pmin
25,800 10,900
30.0 12.7
25,800 10,900
30.0 12.7
28,500 12,500
33.1 14.5
450
600
800
0.25
9
190
19
1.8
1
10
0.8
3
90
44
230/50
125
1/2”
3/4”
1/2”
60
3.50 1.53
16 x 1.25
13.0 2.5
20.0
2.57 1.13
16 x 0.75
35.5 7.0
37.0
3
65
DOMINA OASI - FERELLA BOIL - KEA COMPACT E- MILOS 24 Kw 30 Kw
Electrical power supply

11
DOMINA OASI F 24 - 30 E
FERELLA BOIL F 24 - 30 MEL
KEA AIR COMPACT E
Version - 09.2002
2. PRODUCT FRAMEWORK AND INTERNAL
COMPONENTS
2.1 Hydraulic circuit –heating
Hydraulic diagram for heating
When there is a call for heat, the room thermostat or control system make the burners ignite and the circulation
pump come into operation. The heat contained in the products of combustion is transferred to the water by
the system via the exchanger. For more details on the operating logic, refer to chap.3.
20
82
5
29-187
16
-+
44
7
81
43
32
14
114
34
11 10
49
50
222
36
97
155
130
179
179
74
8
9 192
151
56
Key
5Airtight chamber
7Gas inlet
8Tap water outlet
9Tap water inlet
10 System delivery
11 System return
14 Safety valve
16 Fan
20 Burner assembly
29 Fume outlet manifold
32 Heating circulator
34 Heating temperature sensor
36 Automatic air vent
43 Air pressure switch
44 Gas valve
49 Safety thermostat
50 Heating thermostat
56 Expansion tank
74 Heating system cock
81 Ignition electrode
82 Detection electrode
97 Magnesium anode
114 Water pressure switch
130 Boiler circulator
151 Boiler drain cock
155 Boiler temperature sensor
179 Check valve
187 Fume diaphragm
192 Recirculation
222 Copper exchanger

12
DOMINA OASI F 24 - 30 E
FERELLA BOIL F 24 - 30 MEL
KEA AIR COMPACT E
Version - 09.2002
Circulator (230v/50Hz)
Located on the heating circuit return, it is connected directly to the exchanger
via special forks and connected to the system via a threaded brass fitting. It has
three delivery/head levels (see diagram). Changing the delivery/head changes
the speed of the water flowing through the boiler exchanger and as a result the
temperature difference (∆T) between heating delivery and return. Clearly,
increasing the delivery of the circulator decreases ∆T and vice versa. If it is not
used for a long time, the impeller might “jam”due to debris in the water. With
the front screw it is possible to access the impeller, which can be freed with the
aid of a screwdriver. The connection to the expansion tank and the air separator
is installed on the pump casing.
Checks
If the pump doesn't work:
•Check that the impeller is free to turn by turning the screw on the front with
a screwdriver.
•Check that both the card and the pump connection are powered.
•If there is no power supply, check the card.
•If there is power, change the pump.
Key
1 - 2 - 3 = Pump selector position
A = Losses of head 24kW version
B = Losses of head 30kW version
m
C.A.
m3/h
0,5
1
1,5
2
2,5
3
3,5
4
0,6 0,8 1 1,2 1,4 1,6 1,8 2 2,2 2,4 2,6
4,5
5
5,5
6
2,8 3 3,2 3,4 3,6 3,8 40,40,2
0
0
1
2
3
B
A
Air separator and automatic air vent
This is used to expel the air in the tap-water and heating circuit automatically.
It can be removed by simply unscrewing it from its seat on the air separator. The
function of the latter is to slow down the speed of the water, preventing the air
it contains from getting dragged along.

13
DOMINA OASI F 24 - 30 E
FERELLA BOIL F 24 - 30 MEL
KEA AIR COMPACT E
Version - 09.2002
Expansion tank
It is connected via a pipe with a threaded connection close to the air separator. For the 24kW version, it is
above the boiler and for the 30kW version, it is in front of the boiler, inside the frame. The expansion tank
contains a diaphragm in contact, on one side, with the system water and, on the other side, with the air under
pressure (pre-loaded to 1 bar) inside the tank. By the expansion of the diaphragm and ensuing compression
of the air, the tank compensates for the thermal expansion of the water in the heating system.
30kW 10-litre version
24kW 6-litre version
Exchanger
The exchanger is a copper laminar assembly. It comprises a thickly finned portion and four circular pipes
connected together in series. The water exchanges directly with the combustion gases and makes the system
safe via a safety thermostat set to 100°C and the limit thermostat (88°C) located in the exchanger. Due to its
shape and design, the heat gets evenly distributed over all the finning, with consequent benefits in terms of
exchange efficiency and the life of the exchanger. A special surface treatment protects the exchanger against
oxidation and corrosion.

14
DOMINA OASI F 24 - 30 E
FERELLA BOIL F 24 - 30 MEL
KEA AIR COMPACT E
Version - 09.2002
Drain cock
This is located upstream from the tap-water pump and has the function of
draining the system.
Safety valve
It opens if the pressure exceeds 3 bars, making boiler operation safer and
protecting it against overpressure. You are strongly recommended not to use
this valve to drain the system; once open, dirt could remain inside it, preventing
it from closing completely.
Check valve
It is necessary to ensure the water flows in one direction only and it is located
above the two pumps.
Filler cock
This is located between the heating return and the tap water outlet. It is not fitted
on the boiler for some markets such as the British and Belgian ones. For French
boilers there is a disconnector to be installed externally.
Water pressure switch
It ensures a minimum pressure for the system. It is normally open (NO) and
closes the contact when the pressure exceeds 0.5 bar. It works on low voltage.

15
DOMINA OASI F 24 - 30 E
FERELLA BOIL F 24 - 30 MEL
KEA AIR COMPACT E
Version - 09.2002
2.2 Hydraulic circuit –tap water
Hydraulic diagram for tap water
20
82
5
29-187
16
-+
44
7
81
43
32
14
114
34
11 10
49
50
222
36
97
155
130
179
179
74
8
9 192
151
56
The tap water is supplied via an integrated boiler. It is heated indirectly by a coil in the boiler. The primary water
circulates in the coil thanks to a pump and is kept at a temperature of 85°C by the heating sensor. When the
temperature detected by the boiler sensor is 1°C lower than the set temperature, the heating pump stops and
the tap-water pump starts up immediately. In this way, heating is turned off and the boiler exchanges with the
closed circuit water that in its turn yields the heat to the tap water contained in the boiler.
Key
5Airtight chamber
7Gas inlet
8Tap water outlet
9Tap water inlet
10 System delivery
11 System return
14 Safety valve
16 Fan
20 Burner assembly
29 Fume outlet manifold
32 Heating circulator
34 Heating temperature sensor
36 Automatic air vent
43 Air pressure switch
44 Gas valve
49 Safety thermostat
50 Heating thermostat
56 Expansion tank
74 Heating system cock
81 Ignition electrode
82 Detection electrode
97 Magnesium anode
114 Water pressure switch
130 Boiler circulator
151 Boiler drain cock
155 Boiler temperature sensor
179 Check valve
187 Fume diaphragm
192 Recirculation
222 Copper exchanger

16
DOMINA OASI F 24 - 30 E
FERELLA BOIL F 24 - 30 MEL
KEA AIR COMPACT E
Version - 09.2002
Boiler
The boiler is made of stainless steel and may be of 55 litres (24 kW) or 65 litres (30 kW). It contains a coil
(Aisi 316) whose purpose is to transfer the heat from the primary circuit to the tap-water circuit contained
in the boiler. The cold tap-water inlet (with check valve) is located at bottom right of the boiler. Whereas hot
tap water comes out on the left. Since the water is stratified inside the boiler according to its temperature,
a priming pipe (PVC) is used to draw off the hotter water at the top of the boiler. At the bottom, again, there
is a third connection whose job is to drain the boiler via a cock. The boiler's safety valve is located between
this cock and the boiler (7 bar). This connection can be utilized if the tap-water system is a ring and therefore
needs recirculation. In this case, it is necessary to install the drain cock with a T-junction. At the bottom of
the boiler, near the coil inlet and outlet, there is an NTC sensor in contact (see the paragraph on sensors).
The entire boiler is insulated with polystyrene. A 2-litre diaphragm expansion tank set to 2.5 bar is installed
on the left-hand side. The boiler is flanged at the bottom to permit inspection. There is a magnesium anode
on the flange.
1
2
4
5
6
3
Key
1Boiler
2Coil
3Priming pipe
4NTC sensor
5Expansion tank connection
6Anode

17
DOMINA OASI F 24 - 30 E
FERELLA BOIL F 24 - 30 MEL
KEA AIR COMPACT E
Version - 09.2002
20
82
5
29-187
16
-+
44
7
81
43
32
14
114
34
11 10
49
50
222
36
97
155
130
179
179
74
8
9 192
151
56
2.3 Gas circuit
Gas circuit diagram
Key
5Airtight chamber
7Gas inlet
8Tap water outlet
9Tap water inlet
10 System delivery
11 System return
14 Safety valve
16 Fan
20 Burner assembly
29 Fume outlet manifold
32 Heating circulator
34 Heating temperature sensor
36 Automatic air vent
43 Air pressure switch
44 Gas valve
49 Safety thermostat
50 Heating thermostat
56 Expansion tank
74 Heating system cock
81 Ignition electrode
82 Detection electrode
97 Magnesium anode
114 Water pressure switch
130 Boiler circulator
151 Boiler drain cock
155 Boiler temperature sensor
179 Check valve
187 Fume diaphragm
192 Recirculation
222 Copper exchanger

18
DOMINA OASI F 24 - 30 E
FERELLA BOIL F 24 - 30 MEL
KEA AIR COMPACT E
Version - 09.2002
IN OUT
COMMON
25–50V DC
80–110V DC
B
Gas valve
It supplies gas to the nozzles between a minimum and maximum pressure. For
the valve to work correctly, it is necessary for the pressure upstream from it to
be stable and suited to the type of gas being used, while the valve will supply
a regular pressure to the nozzles. The gas valve contains two operators. The
function of the first one is to open or close, while the task of the second one is
to modulate the capacity according to the system's requirements. The signal
comes from the card (X6-1/2/3/4) and is in the form of continuous voltage. The
first operator receives fixed voltage that may be between 80 and 110V DC, for
the second operator the voltage will vary between 25 and 54V DC according to
the need of the main card.
Checks
If the valve doesn't work:
•Check there is gas, and that gas comes out of the valve by means of screw B.
•If there is no gas, you must check there is voltage at the operators. This
makes it possible to understand whether the problem lies with the valve (there
is voltage at the operators) or with the card (there is no voltage at the contacts
X6-1/2/3/4).
Modulation
The control system governs its boiler capacity so as to keep the delivery temperature constant in accordance
with the settings on the control panel. The nozzle gas pressure is modulated by the valve and specifically via
the 2nd operator. The card provides a change in continuous voltage (between 25 and 54 V DC) according to
the difference between the delivery temperature and the set point.
Checks
Modulation can be checked in three ways:
•Visually, by checking the flame.
•Using a pressure gauge to check the gas pressure downstream from the valve.
•Checking the voltage of the second operator on the card (X6, 1/2). This is the most effective method in some
situations. With this test, it is possible to understand whether the problem lies with the valve or with the
card.
Note that with very low pressure upstream from the valve, opening the valve may be slow and the
boiler could shut down due to failed ignition.

19
DOMINA OASI F 24 - 30 E
FERELLA BOIL F 24 - 30 MEL
KEA AIR COMPACT E
Version - 09.2002
Adjusting burner pressure
Since this unit has flame modulation, there are two fixed pressure settings: the minimum and maximum, which
must be as stated in the technical data chart according to the type of gas.
•Connect a suitable pressure gauge to pressure point "B"
downstream from the gas valve.
•Disconnect the pressure compensation tube "F".
•Take off the protective cap "C".
•Set the potentiometer P3 (on the control card) to minimum
(clockwise).
•Run the boiler in heating mode.
•Adjust the minimum pressure with the screw "D", clockwise to
decrease it and anticlockwise to increase it.
•Set the potentiometer P3 to maximum (anticlockwise).
•Turn on the "TEST" function by temporarily bridging X5.
•Adjust the maximum pressure with the screw "E", clockwise to
increase it and anticlockwise to decrease it.
•Reconnect the pressure compensation tube "F".
•Put the protection screw "C" back in.
•Disconnect the test jumper.
N.B. The test lasts 5 minutes.
C
IN OUT
F
E
B
A
DCOMMON
25–50V DC
80–110V DC
Key
A Pressure point upstream
B Pressure point downstream
C Protection screw
D Minimum pressure adjustment
screw
E Maximum pressure adjustment
screw
F Pressure compensation tube
After checking or
adjusting the pres-
sure, it is mandatory to seal
the adjustment screw with
paint or a specific seal.
24 kW version
30 kW version
kW
mbar
18 19 20 21 22 23
5
10
15
20
25
30
35
91011
12 13 14 15 16 17
8
24 25 26 27 28 29 30 31 32 33 34
G31
LPG
G20
Nat. gas

20
DOMINA OASI F 24 - 30 E
FERELLA BOIL F 24 - 30 MEL
KEA AIR COMPACT E
Version - 09.2002
Gas supply conversion
The unit can function with either Natural Gas or LPG and is factory-set for use with one of the two gases, as
clearly shown on the packing and on the unit's dataplate. Whenever a different gas to that for which the unit
is preset has to be used, a conversion kit will be required, proceeding as follows:
1 Replace the nozzles at the main burner, inserting
the nozzles specified in the technical data table,
according to the type of gas used.
2 Adjust the burner minimum and maximum
pressures, setting the values given in the
technical data chart for the type of gas used.
3 Move the jumper JP02 on the card, as shown in
the diagram:
4 Apply the sticker, contained in the conversion
kit, near the dataplate as proof of the conversion.
Natural gas operation
LPG operation