Solaronics MINIGAZ MHX 25 Owner's manual

TECHNICAL INSTRUCTIONS –Condensing warm air heater MHX–NT20006F-GB –27/10/2023
SOLARONICS Chauffage SAS. ZI n°3, 78 rue du Kemmel –CS 20302 –59429 ARMENTIERES CEDEX - FRANCE
Phone : [phone] - Fax : [phone]
Web site : www.solaronics.com
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Ultra-High Efficiency Warm Air Heater
Condensing MINIGAZ MHX
- Technical instructions -
MHX 25/35/45/60/80
Atmospheric Burner 2 stages
with condensation

TECHNICAL INSTRUCTIONS –Condensing warm air heater MHX–NT20006F-GB –27/10/2023
SOLARONICS Chauffage SAS. ZI n°3, 78 rue du Kemmel –CS 20302 –59429 ARMENTIERES CEDEX - FRANCE
Phone : [phone] - Fax : [phone]
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Summary
1. Introduction..................................................................................................................................................................4
1.1. General.................................................................................................................................................................4
1.1.1. Manufacturer's liability ..........................................................................................................................................4
1.1.2. Installer's liability...................................................................................................................................................4
1.1.3. User's liability........................................................................................................................................................4
1.2. Certifications.........................................................................................................................................................5
2. Safety instructions and recommendations...............................................................................................................5
2.1. Safety instructions.................................................................................................................................................5
2.2. Caution .................................................................................................................................................................6
2.3. Recommendations................................................................................................................................................6
3. Description...................................................................................................................................................................7
3.1. Main components..................................................................................................................................................7
3.2. Operation..............................................................................................................................................................7
3.3. Safety....................................................................................................................................................................8
3.4. Switching off .........................................................................................................................................................8
3.5. Control Board........................................................................................................................................................8
4. Technical characteristics............................................................................................................................................9
4.1. MHX Model...........................................................................................................................................................9
4.1.1. Dimensions of MHX............................................................................................................................................10
4.1.2. Recommendations for MHX installation..............................................................................................................11
5. Fixing the devices......................................................................................................................................................11
5.1. Summary of existing supports.............................................................................................................................11
5.2. Rotating wall bracket SMR..................................................................................................................................12
5.2.1. SMR Dimensions................................................................................................................................................12
5.2.2. SMR Furniture ....................................................................................................................................................12
5.3. SMF Fixed wall brackets.....................................................................................................................................13
5.3.1. SMF 25/35/45 Dimensions..................................................................................................................................13
5.3.2. SMF 25/35/45 Furniture......................................................................................................................................13
5.3.3. SMF 60/80 Dimensions and mounting instructions.............................................................................................14
5.4. IPN Fixing kit.......................................................................................................................................................15
6. Electrical Wiring ........................................................................................................................................................16
6.1. Internal wiring diagram of MHX...........................................................................................................................16
6.2. Electrical connection between interne components............................................................................................17
6.3. Pilot wire principle...............................................................................................................................................18
6.3.1. Pilot wire principle diagram.................................................................................................................................18
6.4. Connection of standards controllers....................................................................................................................19
6.4.1. TM1 EVO Simple Thermostat.............................................................................................................................19
6.4.2. TM2 EVO V2 Touchscreen multi setting thermostat...........................................................................................20
7. Connections flue pipes.............................................................................................................................................21
7.1. General information ............................................................................................................................................21
7.2. Summary of existing flue kits..............................................................................................................................21
7.3. B22 kit connections.............................................................................................................................................22
7.4. C32 Kit Connection.............................................................................................................................................24
7.5. C12 kit Connection..............................................................................................................................................26
8. Gas connection..........................................................................................................................................................28
8.1. Connection of air heaters....................................................................................................................................28
8.2. Condensate Connection .....................................................................................................................................29
9. Gas circuit..................................................................................................................................................................30
9.1. Gas change over.................................................................................................................................................30
9.2. Gas manifold adjustment table ...........................................................................................................................31
9.3. Burner combustion settings ................................................................................................................................31
10. Commissioning and adjustment of the control setpoints......................................................................................33
10.1. Preliminary check................................................................................................................................................33
10.2. Use of the control unit.........................................................................................................................................33
10.3. Setting the heater via the control panel...............................................................................................................37

TECHNICAL INSTRUCTIONS –Condensing warm air heater MHX–NT20006F-GB –27/10/2023
SOLARONICS Chauffage SAS. ZI n°3, 78 rue du Kemmel –CS 20302 –59429 ARMENTIERES CEDEX - FRANCE
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11. Maintenance...............................................................................................................................................................39
12. Spare parts.................................................................................................................................................................40
13. Troubleshooting ........................................................................................................................................................41
13.1. Defaults list of control panel................................................................................................................................41
13.2. General problems list..........................................................................................................................................43
14. Warranty (Extract from the general terms and conditions of sale, chapter WARRANTY) ..................................44
ANNEX.................................................................................................................................................................................45
End of life of the equipment..............................................................................................................................................45
Good safety practice.........................................................................................................................................................45
A smell of gas, the right reflexes ......................................................................................................................................45

TECHNICAL INSTRUCTIONS –Condensing warm air heater MHX–NT20006F-GB –27/10/2023
SOLARONICS Chauffage SAS. ZI n°3, 78 rue du Kemmel –CS 20302 –59429 ARMENTIERES CEDEX - FRANCE
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1. Introduction
In these instructions, warnings are used to draw attention to particular indications. This is to ensure the safety
of the user, to avoid problems and to guarantee the correct functioning of the appliance.
WARNING
Indicates a possible dangerous situation that may result in personal injury and/or property damage.
Indicates important information.
Indicates a reference to other notices or other pages of the manual.
Before installing and commissioning the device, read all enclosed notices carefully.
1.1.General
1.1.1. Manufacturer's liability
Our products are manufactured in compliance with various applicable European directives requirements. They
thus supplied with CE (EC) label and all necessary documents. With our commitment to quality products, we
constantly seek to improve them. Therefore, we reserve the right to modify the characteristics stated in this
document. Our liability as a manufacturer does not apply in the following cases:
•Failure to follow operating instructions for the appliance.
•Failure to maintain or insufficiently maintain the appliance.
•Failure to follow installation instructions for the appliance
1.1.2. Installer's liability
The Installer is responsible for the installation and first commissioning of the device. The Installer must observe
the following:
•Read and follow the instructions given in the instruction manuals provided with the device.
•Carry out the installation by the applicable legislation and standards
•Carry out the first commissioning and carry out all necessary controls.
•Explain the installation to the User.
•Inform the User that he cannot make changes in the appliance's design and to the installation by
himself. The slightest modification (change, removal) of security components or parts automatically
results in the appliance's CE (EC) label being invalid.
•Alert the User about the obligation to control and maintain the device.
•Hand all documents to the User.
1.1.3. User's liability
To ensure the correct operation of the appliance, the User must observe the following: :
•Read and follow the instructions given in the instructions manuals provided with the device .
•Call a qualified technician to carry out the installation and perform the initial commissioning.
•Obtain explanations about the building from Installer.
•Keep all documents in good condition and near the appliance.
A maintenance contract is strongly recommended and is compulsory for appliances installed in
public buildings.
•Keep the instructions in good condition near the appliance.

TECHNICAL INSTRUCTIONS –Condensing warm air heater MHX–NT20006F-GB –27/10/2023
SOLARONICS Chauffage SAS. ZI n°3, 78 rue du Kemmel –CS 20302 –59429 ARMENTIERES CEDEX - FRANCE
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1.2.Certifications
This equipment complies with the essential requirements of Regulation (EU) 2016/426 « Gas Appliance ». It is
registered under number n° 1312DL6489, standards EN17082 :2019.
The appliances covered by this manual also comply with the directives:
•Low voltage 2014/35/UE,
•Electromagnetic Compatibility 2014/30/EU,
•Ecodesign 2009/125/EC, according to the requirements of Regulation (UE) 2016/2281-2282-2283 of
30 November 2016.
2. Safety instructions and recommendations
2.1.Safety instructions
WARNING
The gas heater is a live appliance and as such it must be connected to the installation’s ground.
•It is forbidden to block and/or reduce the ventilation openings of the installation room or the
appliance.
•Never block the smoke exhaust or the fresh air intake.
•Never spray water on the heater, or touch the heater with wet body parts and/or bare feet.
•Do not place or hang any object on the heater.
•Do not work on the heater until it has been disconnected from the electrical supply and the gas supply
has been cut off.
•Do not change the type of gas used, appliance settings, the safety or control systems, as this could lead
to dangerous situations.
Contact a qualified technician in the event of a change in gas, gas pressure or supply voltage.
If the appliance is not used for a long period of time, disconnect the power supply. When restrarting the
appliance, it is advisable to call qualified personnel. In general, all repair and maintenance work must be carried
out only by authorized and qualified personnel.
The subscription of a maintenance contract is strongly recommended and is compulsory in the case of
appliances installed in an establishement receiving the public.

TECHNICAL INSTRUCTIONS –Condensing warm air heater MHX–NT20006F-GB –27/10/2023
SOLARONICS Chauffage SAS. ZI n°3, 78 rue du Kemmel –CS 20302 –59429 ARMENTIERES CEDEX - FRANCE
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2.2.Caution
Electrical components, drive mechanisms and fuel gas can cause injury. To protect against these inherent risks
during installation or maintenance, the electrical supply must be disconnected and the gas supply valve closed.
All persons involved in the installation or servicing of this equipment must comply with all relevant
occupational health and safety standards.
2.3.Recommendations
Gas heaters are intended for use in industrial and commercial premises.
The greatest care should therefore be taken during installation and adjustment.
We recommend that you entrust their commissioning to Solaronics Chauffage.
Maintenance of the appliance should be carried out every year to ensure their availability, maintain their high
level of performance and also their operational safety.
WARNING
- Only a qualified professional is allowed to work on the unit and the installation.
- This manual is an integral part of the appliance and must always be kept with the apppliance, even if it is
transferred to another owner or user.
- Never remove or cover the labels and data plates attached to the appliance. The labels and date plates must
be legible for the entire life of the appliance.
- Install the appliance in an adequately ventilated room.
Consult us for any other application than those described in this document.
NOT TO DO !
Do not install unit heaters :
- In locals where there is a risk of explosion.
- In locals with a high content of combustible dust.
- In locals containing vappours from chlorinated compounds.
- In locals with high humidity ( electrical hazard)
- In rooms with domestic use.

TECHNICAL INSTRUCTIONS –Condensing warm air heater MHX–NT20006F-GB –27/10/2023
SOLARONICS Chauffage SAS. ZI n°3, 78 rue du Kemmel –CS 20302 –59429 ARMENTIERES CEDEX - FRANCE
Phone : [phone] - Fax : [phone]
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3. Description
The Condensing Minigaz MHX gas heater is an independent warm air generator, operating on natural gas or
propane.
It is a « direct » gas heating system; it is a heat production and emission device without intermediate heat
transfer fluid.
For the entire range described in this manual, the combustion products are discharged from the room via an
extractor.
The combustion air is taken from the local or from the outside. These appliances can be connected to a vertical
or horizontal flue or to chimney.
They operate with the different gases indicated on their nameplate in accordance with the European directive.
3.1.Main components
3.2.Operation
When there is a heating demand, the exhaust fan starts via the thermostat’s local.
After a few seconds of pre-ventilation. To ensure that there is no gas in the combustion chamber, the burner
is ignited by the ignition electrode. The rise in temperature if the heat exchanger triggers the start-up of the
blowing fan, the located at the back of the appliance. The hot air produced is then blown into the room
When the set temperature is reached, the thermostat gives the stop command and the burner switches off.
The blowing fan continues to blow for about 1 minute until the remaining heat in the heat exchanger has been
removed.
The very high performance of the MHX condensing range is obtained by adding a condensation exchanger to
the firebox. The combustion production i.e. the flue gases, pass through this second exchanger where their
temperature is lowered to recover the energy that would otherwise be lost and thus allow a better combustion
efficiency.

TECHNICAL INSTRUCTIONS –Condensing warm air heater MHX–NT20006F-GB –27/10/2023
SOLARONICS Chauffage SAS. ZI n°3, 78 rue du Kemmel –CS 20302 –59429 ARMENTIERES CEDEX - FRANCE
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3.3.Safety
The flame failure, during the ignition or during operation, is detected by the ionization sensor and the gas
solenoid valve is immediately closed. This fault can be reset remotely or on the appliance.
The thermal protection of the exchanger is ensured by two thermostats.
The first, with automatic reset, protects against insufficient air flow (obstructions, fan failure).
The second, with manual reset, is set at a higher threshold than the first. It protects the appliance from severe
overheating due to operating problems or improper use.
Make sure that the appliance can be supplied with normal combustion air at atmospheric pressure (any
modification of the building after installation of the appliance must be carried out taking this into account)
Excessive negative pressure in the room can interfere with proper operation of the appliance by depriving it
of the air necessary for combustion.
3.4.Switching off
To shut down the appliance for a short period of time, simply cut the thermostatic line (set the thermostat to
a minimum setting or turn off the thermostat switch).
For a longer shutdown. Cut the thermostatic line, close the gas valve and cut the electrical supply, taking care
to wait for the fan to stop.
Gas and electricity should only be cut off in case of emergency or for long periods of time.
IMPORTANT
Never cut off the power supply to the appliance during the operating or cooling cycle of the exchanger. Failure
to follow these instructions may cause premature deterioration of the exchanger and will result in loss of
warranty.
3.5.Control Board
These appliances are equipped with a control board that allows intelligent management of the operation. In
the event of a fault, the board indicates the source and facilitates the work of the technician.

TECHNICAL INSTRUCTIONS –Condensing warm air heater MHX–NT20006F-GB –27/10/2023
SOLARONICS Chauffage SAS. ZI n°3, 78 rue du Kemmel –CS 20302 –59429 ARMENTIERES CEDEX - FRANCE
Phone : [phone] - Fax : [phone]
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4. Technical characteristics
4.1.MHX Model
The MINIGAZ MHX gas unit heaters are equipped with an axial fan,
a two-stage gas burner and a condensing exchanger.
The MHX is available in 5 models from 25 to 80 kW and is designed
for horizontal installation and direct blowing
MODELS
MHX25
MHX35
MHX45
MHX60
MHX80
Nominal heat input HHV
kW
29.1
40.4
51.4
67.8
88.6
Nominal heat input LCV
kW
26.3
36.4
46.3
61.1
79.8
Heating capacity at P. Maxi
kW
27.4
38.0
48.1
63.6
82.3
Heating capacity P. Mini
kW
15.6
21.7
27.4
36.3
47.0
Combustion efficiency at P. Maxi
%
104.2
104.5
103.9
104.0
103.1
Combustion efficiency at P. Mini
%
107.1
107.6
106.8
107.1
106.2
Gas flow at nominal heat output at 15°C
Natural gas G20
Groningen gas G25
Propane gas G31
m3/h
m3/h
kg/h
2.50
2.68
2.05
3.47
3.73
2.84
4.41
4.74
3.61
5.82
6.25
4.77
7.60
8.17
6.23
NOx with 0 % O2
mg/kW
< 70 / Classe 5
CO value
ppm
< 120
Seasonal efficiency (ƞs,h)
%
88.4
89.1
87.7
88
86.2
Supply voltage
Monophased 230 V 50 Hz
Nominal current
A
1.05
1.75
2
3.25
3.95
Max. electrical power with ventilation
W
230
380
430
700
850
Electrical power at P Max without ventilation
(elmax)
W
22
38
56
70
92
Electrical power at P mini without ventilation
(elmin)
W
12
22
26
28
36
Electrical power in standby mode (elsb)
W
3
3
3
3
3
Fan air flow rate at 15 °C
m3/h
3 320
5 000
5 400
7 200
7 800
Air temperature rise at P Maxi
°C
24.2
22.4
26.2
26.0
31.0
Air temperature rise at P Mini
°C
13.9
12.8
14.9
14.8
17.7
Acoustic power –Lw (+/- 4 dB)
dB(A)
72.0
79.8
78.6
87.0
85.6
Acoustic pressure at 5 m –Lp (+/- 4 dB)
dB(A)
50.0
57.8
56.6
65.0
63.6
Available air/flue pressure drop
Pa
120
200
250
300
240
Maximum hourly condensate volume
l/h
1.35
1.87
2.38
3.15
4.11

TECHNICAL INSTRUCTIONS –Condensing warm air heater MHX–NT20006F-GB –27/10/2023
SOLARONICS Chauffage SAS. ZI n°3, 78 rue du Kemmel –CS 20302 –59429 ARMENTIERES CEDEX - FRANCE
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4.1.1. Dimensions of MHX
Types
MHX 25
MHX 35
MHX 45
MHX 60
MHX 80
A
mm
1 060
B
mm
1 100
C
mm
495
545
600
710
912
D
mm
72
82
E
mm
746
F
mm
250
G
mm
485
H
mm
100
125
153
208
276
Ø Flue
mm
80
100
Ø Air
mm
80
100
Ø Gas
‘’
3/4
Weight
kg
105
115
140
180
200
Top view
Back view
Lateral view

TECHNICAL INSTRUCTIONS –Condensing warm air heater MHX–NT20006F-GB –27/10/2023
SOLARONICS Chauffage SAS. ZI n°3, 78 rue du Kemmel –CS 20302 –59429 ARMENTIERES CEDEX - FRANCE
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4.1.2. Recommendations for MHX installation
5. Fixing the devices
The appliances can be fixed to the wall or frame of buildings. Before fixing the units, the strength of the support
must be ensured. It is possible to make your own fixing but a preliminary study must be carried out to ensure
the strength of structure.
For the use of our brackets, always refer to the instructions supplied with the brackets.
5.1.Summary of existing supports
For MHX air heater
25
35
45
60
80
Rotating wall bracket SMR
3500346
Not compatible
IPN fixing kit for SMR
Not available
Fixed wall bracket SMF
3500345
3500347
IPN fixing kit for SMF
3500074
Not compatible
300 mm
2500 mm
200 mm
500 mm

TECHNICAL INSTRUCTIONS –Condensing warm air heater MHX–NT20006F-GB –27/10/2023
SOLARONICS Chauffage SAS. ZI n°3, 78 rue du Kemmel –CS 20302 –59429 ARMENTIERES CEDEX - FRANCE
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5.2.Rotating wall bracket SMR
The kit «Rotating wall Bracket » (code 3500346) is a rotating wall bracket for type
MHX 25 to MHX 45.
The models MHX 60 et 80 are not compatible with SMR kit.
There are no IPN fixing kit compatible with SMR kit.
5.2.1. SMR Dimensions
5.2.2. SMR Furniture

TECHNICAL INSTRUCTIONS –Condensing warm air heater MHX–NT20006F-GB –27/10/2023
SOLARONICS Chauffage SAS. ZI n°3, 78 rue du Kemmel –CS 20302 –59429 ARMENTIERES CEDEX - FRANCE
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SMF 25/35/45
SMF 60/80
5.3.SMF Fixed wall brackets
The kits « fixed wall bracket » (code 3500345 and
3500347) are fixed wall brackets for the MHX 25 to
MHX 80 models.
The SMF 25/35/45 model can be combined with the
IPN fixing kit (code 3500349) for fixing to a metal
frame.
The MHX 60 et 80 are not compatible with the IPN
fixing kit.
5.3.1. SMF 25/35/45 Dimensions
5.3.2. SMF 25/35/45 Furniture
REP
Description
Qty
1
Wall bracket
2
2
Air heater support
2
3
Tensioning M10
2
4
Spreader
2
-
Screws Kit
1

TECHNICAL INSTRUCTIONS –Condensing warm air heater MHX–NT20006F-GB –27/10/2023
SOLARONICS Chauffage SAS. ZI n°3, 78 rue du Kemmel –CS 20302 –59429 ARMENTIERES CEDEX - FRANCE
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5.3.3. SMF 60/80 Dimensions and mounting instructions
711
120
540
420
4x Screws M8x25

TECHNICAL INSTRUCTIONS –Condensing warm air heater MHX–NT20006F-GB –27/10/2023
SOLARONICS Chauffage SAS. ZI n°3, 78 rue du Kemmel –CS 20302 –59429 ARMENTIERES CEDEX - FRANCE
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1
2
3
5
4
6
7
Pass the threaded rod through
the rail
Locking tabs on the opening side
of the rail
Hook's tip on the
IPN
Tighten the 8 nuts
Adjustable center distance
5.4.IPN Fixing kit
REP
Description
Qty
1
Rail length 1 000 mm
2
2
Safety cap
4
3
HK27 Locking tab
8
4
M10 Threaded rod length 150 mm
4
5
M10 nut
8
6
M10 grooved rail nut
4
7
Hook
4

TECHNICAL INSTRUCTIONS –Condensing warm air heater MHX–NT20006F-GB –27/10/2023
SOLARONICS Chauffage SAS. ZI n°3, 78 rue du Kemmel –CS 20302 –59429 ARMENTIERES CEDEX - FRANCE
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6. Electrical Wiring
6.1.Internal wiring diagram of MHX
Note : The neutral conductor coming out of the power cable of the devices can be blue or grey.

TECHNICAL INSTRUCTIONS –Condensing warm air heater MHX–NT20006F-GB –27/10/2023
SOLARONICS Chauffage SAS. ZI n°3, 78 rue du Kemmel –CS 20302 –59429 ARMENTIERES CEDEX - FRANCE
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6.2.Electrical connection between interne components

TECHNICAL INSTRUCTIONS –Condensing warm air heater MHX–NT20006F-GB –27/10/2023
SOLARONICS Chauffage SAS. ZI n°3, 78 rue du Kemmel –CS 20302 –59429 ARMENTIERES CEDEX - FRANCE
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6.3.Pilot wire principle
WARNING
The air heaters can not be controlled by a traditional thermostat ( with dry contact)
Only the specific « pilot wire » thermostats supplied by Solaronics can control the heaters.
The purpose of the pilot wire is to limit the number of conductors to be connected.
One and the same pilot allows to transmit an order:
•Ventilation
•Heating
•Reset
The control principle of the air heaters is described below:
Waveform emitted by the temperature controller
Order included by the unit heater
No wave
Stop
Positive alternation
Ventilation
Negative alternation
Heating
Full Wave*
Reset
* The reset is a temporary impuls and should not be permanent .
6.3.1. Pilot wire principle diagram
VENTILATION
HEATING
RESETING
PILOT WIRE
PHASE
NEUTRAL
GROUND
POWER SUPPLY
AIR HEATER
PE
N
L1
GREEN /YELLOW
BLUE or GREY
BLACK
BROWN
REGULATION

TECHNICAL INSTRUCTIONS –Condensing warm air heater MHX–NT20006F-GB –27/10/2023
SOLARONICS Chauffage SAS. ZI n°3, 78 rue du Kemmel –CS 20302 –59429 ARMENTIERES CEDEX - FRANCE
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6.4. Connection of standards controllers
6.4.1. TM1 EVO Simple Thermostat
Provide electrical protection for the number of heaters.
Note : The neutral conductor coming out of the power cable of the devices can be blue or grey.

TECHNICAL INSTRUCTIONS –Condensing warm air heater MHX–NT20006F-GB –27/10/2023
SOLARONICS Chauffage SAS. ZI n°3, 78 rue du Kemmel –CS 20302 –59429 ARMENTIERES CEDEX - FRANCE
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6.4.2. TM2 EVO V2 Touchscreen multi setting thermostat
Provide electrical protection for the number of heaters.
Note: The neutral conductor coming out of the power cable of the devices can be blue or grey.