SBM AMC 12 User manual

Manufacturer:
SBM Tél : [phone]
3 cottages de la Norge Fax : [phone]
21490 CLENAY e-mail : [e-mail]
FRANCE http://www.sbm-international.net
1
MODULATING AND CONDENSING GAS WARM AIR HEATER
0063
INSTALLER AND USER
INSTRUCTIONS
N° 05000706 / 0
AMC 12/19/29/39/48/58/78/97/116
PLEASE READ CAREFULLY THIS DOCUMENT BEFORE STARTING THE INSTALLATION.
THIS DOCUMENT SHALL BE LEAVED AT THE END-USER AFTER INSTALLATION.
EN

2
INDEX
1.
APPL
ICATION RESTRICTIONS
Page
4
1.1 Pre-check .............................................................................................. 4
1.2 Protection degree .................................................................................. 4
2.
TECHNICAL SPECIFICATIONS
Pages
5
to
6
3.
INSTALLATION
Pages
7
to
12
3.1 Hanging and fixing ................................................................................ 7 to 8
3.2 Gas connection ..................................................................................... 9
3.3 Electrical connection ............................................................................. 9 to 10
3.4 Air intake / Combustion products discharge .......................................... 10 to 12
3.5 Condensate discharge .......................................................................... 12
4
.
APPLIANCE OPERATION
Page
s
13
to
15
4.1 Generality .............................................................................................. 13
4.2 Heat demand ........................................................................................ 13
4.3 Delta-T regulation (De-stratification fan mode) ..................................... 13
4.4 Summer ventilation ............................................................................... 13
4.5 Thermal protections .............................................................................. 14
4.6 Pressure switch ..................................................................................... 14
4.7 Description of the control board ............................................................ 14 to 15
5
.
STARTING AND SETTING
Page
s
15
to
16
5.1 Generality .............................................................................................. 15
5.2 Start by using the service button ........................................................... 16
5.3 Start by using the MULTITHERM thermostat ........................................ 16
5.4 Flame default simulation and restart ..................................................... 16
5.5 Control board display ............................................................................ 16
6.
ADJUSTEMENT OF THE GAS VALVE
Page
1
7
7
TROUBLESHOOTING
Pages
1
8
to
19
7.1 Generality .............................................................................................. 18
8
.
MAINTENANCE
Page
20
8.1 Main inspection of the appliance ........................................................... 20
8.2 Appliance servicing ............................................................................... 20
8.3 Ignition electrode ................................................................................... 20
9.
REGULATION EXAMPLES
Page
s
2
1
to
23
9.1 Individual regulation with MULTITHERM C or S (AMC 12 to 58) .......... 21
9.2 Centralized regulation with MULTITHERM C or S (AMC 12 to 58) ....... 21 to 22
9.3 Individual regulation with MULTITHERM C or (AMC 78 to 116) ........... 22
9.4 Centralized regulation with MULTITHERM C or S (AMC 78 to 116) ..... 22 to 23
9.5 Regulation with a Building Management System (BMS) ....................... 23

3
10.
INTERNAL ELECTRIC DIAGRAM
Page
s
24
to
25
10.1 Warm air heaters AMC 12 to 58 ............................................................ 24
10.2 Warm air heaters AMC 78 to 116 .......................................................... 25
11.
SPARE PARTS
Page
s
26
to
29
11.1 Spare parts ............................................................................................ 26
11.2 Exploded view AMC 12 to 19 ................................................................ 27
11.3 Exploded view AMC 29 to 58 ................................................................ 28
11.4 Exploded view AMC 78 to 116 .............................................................. 29
GENERALITIES
In order to improve the products, SBM is reserving the right to modify without warning, the
specifications of the appliances.

4
1. APPLICATION RESTRICTIONS
The installation and maintenance of this air heater should be performed by an authorized
competent installer and in accordance with this manual.
The appliance shall be CE marked.
Respect the safety clearances with the inflammable materials.
This appliance is not intended for use by persons (including children) with reduced
physical, sensory or mental capabilities, or lack of experience and knowledge, unless they
have been given supervision or instruction concerning use of the appliance by a person
responsible for their safety. Children should be supervised to ensure that they do not play
with the appliance.
In case where the air intake is done inside the room (type B connection), provide a
sufficient ventilation by referring to the rules in force.
1.1 Pre-check
Before unpacking and installation, please check (i.e. on the data badge) if the heater is in accordance with
the order and if it is suitable for the local present provisions (gas type, gas pressure, electrical supply etc.)
The Installation must comply with all applicable local and national standards.
If this heater is drawing its combustion air from within the room in where it is located, the necessary
combustion ventilation requirements must be followed for gas safety regulations.
Make sure that the warm air can be blown out freely. There should absolutely be (no possibility of)
materials within 5m from the front of the heater.
The heaters have been tested in detail on safety and correct operating settings before leaving the factory. It
has been adjusted for the type of gas that is stated on the data badge.
If there is any doubt, please contact SBM.
1.2 Protection degree
The appliances have been designed for a use in a dry and not very dusty environment (protection degree
IP20).
The heater should not be installed in areas containing any corrosive or explosive steam, in high moisture or
dust concentrations, at negative pressures or temperatures higher than 30°C; please consult SBM. The
guarantee is then invalidated.

5
2. TECHNICAL SPECIFICATIONS
AMC MODEL 12 19 29 39 48 58 78 97 116
Maximal heat input Hi (
G20
&
G31
) kW 12,5 20,0 30,0 40,0 50,0 60,0 80,0 100,0 120,0
Minimal heat input Hi (
G20
&
G3
1) kW 4,0 6,0 9,0 12,0 15,0 18,0 24,0 30,0 36,0
Maximal heat output (
G20
&
G31
) kW 12,0 19,2 29,0 38,8 48,3 58,0 77,6 96,8 115,8
Minimal heat output (
G20
&
G31
) kW 4,2 6,4 9,5 12,8 15,9 19,1 25,2 31,5 37,8
Maximal heat input Hi (
G25
) kW 10,5 16,8 25,8 33,3 42,0 49,8 66,6 84,0 99,6
Minimal heat input Hi (
G25
) kW 3,1 5,0 7,7 10,1 12,6 15,2 20,2 25,2 30,4
Maximal heat output (
G25
) kW 10,1 16,1 24,9 32,3 40,5 48,1 64,6 81,0 115,8
Minimal heat output (
G25
) kW 3,3 5,3 8,0 10,8 13,4 16,1 21,2 26,5 31,9
Efficiency at max. heat input % 96,0 96,0 96,5 97,0 96,5 96,6 97,0 96,8 96,5
Efficiency at min. heat input 30% % 106,0 106,0 106,0 106,5 106,0 106,0 105,0 105,0 105,0
Maximum hot air flow m
3
/h 2000 2600 3000 4500 5000 6000 8500 10000 12000
Maxi. horizontal throw m 15 20 23 26 28 30 30 30 33
Gas connection Rp 1/2" (ISO 7) G 3/4" (ISO 228) Rp 1" (ISO 7)
Electrical supply 230 VAC / 50-60 Hz
Puissance électrique absorbée W 250 250 275 450 600 600 900 1000 1050
Maximum electric current A 1,1 1,1 1,2 2,0 2,6 2,6 3,9 4,4 4,7
Low voltage thermostat Yes
Sound level (average) dBA 45 45 45 47 48 49 50 51 52
Minimal hanging height m 1,7
Maximal length of the duct m 9
Weight kg 45 50 75 85 105 110 180 195 205
Maximum condensation flow l/h 2 2 3 3 4 4 6 8 8
Natural gas G20 and G25
Nominal supply gas pressure
G20
mbar 20 (17 to 25)
Nominal supply gas pressure
G25
mbar 25 (20 to 30)
Gas category Cat. I2Esi
Class for combustion products discharge B23, C13 or C33
Maximum gas consumption
G20
m
3
/h 1,3 2,1 3,2 4,2 5,3 6,3 8,4 10,6 12,6
Maximum gas consumption
G25
m
3
/h 1,3 2,0 3,1 4,0 5,0 5,9 8,0 10,0 11,8
CO2 at high speed
G20
% 9,5 9,5 9,2 9,2 9,2 9,2 9,2 9,2 9,2
CO2 at low speed
G20
% 9,0 9,0 8,8 8,8 8,8 8,8 8,8 8,8 8,8
CO2 at high speed
G25
% 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0
CO2 at low speed
G25
% 7.8 7.8 7.8 7.8 7.8 7.8 7.8 7.8 7.8
NOx (at 0% of O2) mg/kWh 28 20 38 35 28 30 31 27 29
NOx class 5
CO (at 0% of O2) mg/kWh 4 5 1 1 3 3 1 4 1
Maximum combustion products flow kg/h 19,4 31,1 48,1 64,2 80,2 96,2 128,4 160,4 192,4
Propane G31
Nominal supply gas pressure
G31
mbar 30-50
Supply gas pressure (min-max)
G31
mbar 25-50
Gas category Cat. I3P
Class for combustion products discharge B23, C13 or C33
Maximum gas consumption
G31
kg/h 1,0 1,6 2,4 3,2 4,0 4,8 6,4 8,0 9,6
CO2 at high speed level
G31
% 10,7 10,7 11,0 11,0 11,0 11,0 11,0 11,0 11,0
CO2 at low speed level
G31
% 10,3 10,3 10,5 10,5 10,5 10,5 10,5 10,5 10,5
NOx (at 0% of O2) mg/kWh 24 17 36 39 32 41 39 34 41
NOx class 5
CO (at 0% of O2) mg/kWh 13 8 3 1 1 1 1 1 1
Maximum combustion products flow kg/h 19,4 31,1 48,1 64,2 80,2 96,2 128,4 160,4 192,4
The AMC 78, 97 and 116 models are compound respectively of 2x AMC 39, 2x AMC 48 and 2x AMC 58
in a same body with one gas connection and one air intake/exhaust gases, one electric connection, one
connection for the thermostat and one connection for condensates.
For a proper operation and in order to avoid interaction between the premix fan and the burner, a check
valve was added.
The connection of the MULTITHERM C or S to the AMC 78, 97 and 116 models as well as the micro-
switch S2 and S3 setting is explained in the paragraph 9.3 and 9.4, pages 22 and 23.

6
795
670
575
650 125 470
545
M10
4x M10
M10
115140 110
100
105
Gas 3/4" ext.
INO80
OUTO80
325
400
180
=
=
35
85
180 815
470
650 125
4X M10
565 670
1065
Gas 3/4" ext.
100
115
105
11014035
85
IN O80
OUT O80
O40
O40
280
280
815227
600
812
75
280
1115
1090
1195
840
69
454
11045
158
158
Gas 1" int.
Ø40
125
490
660
495
150
85
110
100
150
285
245
M10
Gas 1/2"
420
280
M10
M10
IN O80
OUT O80
O40
560
AMC 12 and 19
AMC
29
AMC 39, 48 and 58
AMC
78, 97
and
116

7
3. INSTALLATION
3.1 Hanging and fixing
 Check that the support is solid enough.
 The warm air heater must apire and exhaust freely
The presence of any obstacle can conduct to an over-
Heating of the appliance.
 Keep sufficient distance between the heater and any
obstruction, in connection with safety and access for
service and maintenance. Pay particular attention to
any flammable materials. Please take into account the possibility to open the door of the heater for
the necessary service and maintenance work.
 The heater can be installed horizontally or with an angle of maximum 45°.
• The units are provided with pieces of M10 threaded sockets as fixing points.
• AMC 12 and 19 models have 2 pieces of M10 threaded sockets in their centre on the top and
underneath the heater.
• AMC 29 and 39 have 2 pieces of M10 threaded sockets in their centre on the top and underneath
then 4 additional pieces of M10 threaded sockets on the top of the heater.
• AMC 48 and 58 models have 4 threaded sockets on the top and underneath.
• See the schemes above to see the dimensions.
• We recommend using the SBM suspension kits for a safe installation.
• Be sure that there is no mechanical tension on the different connections after installation.
Consult the “APPLICATION RESTRICTION” chapter page 4.
 Positioning possibilities
Standard bracket for AMC 12 to 39 Design bracket for AMC 12 and 19
orientable at 180° horizontally orientable at 180° horizontally
min 250
10 t/m 30 min. 500 mm
40 t/m 60 min 660 mm
12 à 29 : 500 min.
39
à 1
16
: 660 min
.
250
min
.
Ref. SBM Designation A B C
5760007
WALL BRACKET AM12-29/AMC12-19 555 640 800
5760008
WALL BRACKET AM39-58/AMC29-39 665 815 990
Ref. SBM Designation
5760013
DESIGN BRACKETAM12-29/AMC12-19
B
150
390
A
C
XR10-30 XR40-60
HR10-20 HR30-40
A 550 665
B 640 815
C 800 990

8
Suspension adapter AM 12, 19 and 29
for M10 threaded bars suspension
Cantilever brackets
for AMC 29 to 58.
1200
1200
See installation manual
45°
15° & 30°
Horizontal
15° 30° 45°
Horizontal
See technical
instructions
Horizontal
15° and 30°
45°
Ref. SBM Designation
5760012
ADAPT. THREADED BARS AM AMC
Ref. SBM Designation
576001
1
CANTILEVER BRACKETS AMC

9
3.2 Gas connection
 The gas installation shall be done by a qualified worker. The rules of gas installation shall be
respected.
 A manual isolation gas valve in the supply line must be placed within reach of the heater, and all
gas lines must be mounted without any mechanical tension. The installation of a gas filter and the
purge of gas pipes before the first start-up are strongly recommended.
 The sealing of the gas network have to be checked before the first start of the installation according
to the rules in force.
 The dynamic gas pressure upstream the solenoid valve shall be at least 17 mbar for G20 and
20 mbar for G25. This dynamic pressure cannot be greater than 30 mbar.
For G31, it shall be less than 37 mbar.
 It is eventually possible to change the gaz type (natural gas/propane).
In this case, please contact your installer.
These appliances were design to operate with natural gas G20 or G25.
When operating with G25, the heat input will be lower than when operating in G20 (see the
technical specifications in page 5).
It is forbidden to turn the setting screws which are sealed by the manufacturer.
3.3 Electrical connection
3.3.1 Electric supply 230 V
 The electrical installation shall satisfy the local/national rules in force. Be sure that the main supply
is 230VAC with earth and a R.S.D (Residual Current Device) with a sensibility of 30 mA
upstream the heater for the protection of people and installation. The polarity phase/neutral shall be
absolutely respected.
See the electrical diagram, pages 24 and 25.
3.3.2 Electrical supply interruption
 Never interrupt the power supply of the device accidentally. It could drive to an overheating of the
heat exchanger and to the safety state of the overheated device.
Be careful to the electric breaks of the network, it is possible that the temperature of the appliance
is going up (overheating)
Never turn off the power while the unit is warming up!
3.3.3 Room Thermostat
 The warm air heaters AM can be driven only with the MULTITHERM S or C thermostat.
They are not operating with simple ON/OFF thermostat.
 MULTITHERM thermostats type :
MULTITHERM S (Ref SBM 5760001) ; modulating numerical thermostat
without clock able to regulate from 1 to 8 appliances AMC 12 to 58 or 1 to 4 appliances
AMC 78 to 116.
MULTITHERM S WITH CONTACT (Ref SBM 5760004); modulating numerical thermostat
without clock, with terminal for external contact, able to regulate from 1 to 8 appliances
AMC 12 to 58 or 1 to 4 appliances AMC 78 to 116.
MULTITHERM C (Ref SBM 5760001) ; modulating numerical thermostat with clock able to
regulate from 1 to 8 appliances AMC 12 to 58 or 1 to 4 appliances AMC 78 to 116.
MULTITHERM C WITH CONTACT (Ref SBM 5760005) ; modulating numerical thermostat with
clock, with terminal for external contact, able to regulate from 1 to 8 appliances AMC 12 to 58
or 1 to 4 appliances AMC 78 to 116.

10
 Recommendations for MULTITHERM installation :
• The connection between the MULTITHERM and the warm air heaters have to be done with
a two-wires shielded and twisted cable 1 x 2 x 0.75 mm, with a maximum length of 200 m.
• Connect the earth shield of the cable only to the earth terminal in the warm air heater.
• The appliances should be disconnected from the electrical network during the connection.
• The installation and start-up of the room thermostat are described into the technical instructions
delivered with the MULTITHERM S or C.
• The thermostat have to be installed in a dry place and moderately dusty.
• Place the thermostat in a place where the air can circulate freely.
• Take care of the risk of sun exposition or the presence of warm sources.
• Avoid installing it near to a cold wall or where there is air flow.
Do never install the thermostat closed to the internal network communication antennas!
These last are emitting a radiation which can conduct to a disturbance of the thermostat.
It is always necessary to keep a distance of some meters.
3.3.4 Fuses
 There are 2 fuses in the appliance, on the main print board: F1 and F2 are placed on the phase
and neutral of the electric supply of the heater. In case of defective fuse, replace it with an
identical fuse size 5x20 - 5A Temporized.
3.4 Air intake / combustion products discharge
Check for compliance with local / national regulations. Only the material mentioned above can be
used. This applies for wall or roof terminals also for exhaust products connections in order to have a
certified and approved installation.
In some cases, and according to the regulation, the terminal must exceed the rooftop by at least 0.5m.
3.4.1 Flue materials
 It is allowed to use only the sealed and corrosion resistant flue pipes CE marked with a
temperature class at least T120.
These flue pipes are not supplied by SBM.
Use only flue pipes with the same diameter.
3.4.2 Terminals
 Only the terminals supplied by SBM can be used.
These terminals are certified with the warm air heaters.
Terminals
Roof flashings
Ref. SBM Designation Ref. SBM Designation Ref. SBM Designation
576002
0
ROOF TERMINAL
AM
C
80/125
5760022
FLAT ROOF FLASHING
80/130
5760023
ADJUSTABLE FLASHING
57600
35
ROOF TERMINAL
AM
C
1
3
0/
21
0
57600
36
FLAT ROOF FLASHING
1
3
0/
21
0
57600
37
ADJUSTABLE FLASHING
576003
4
WALL TERMINAL AMC 80/125
576003
8
WALL TERMINAL AMC 130/210

11
575
1370
O125
80O
HOH 110
max 300
135 610
O125
80
HOH 110
3.4.3 Assembly
Follow the assembly instruction of the air intake and combustion products discharge
includes into the package of these systems.
Always check the proper sealing of the flue systems.
 The warm air heater is a condensation unit. Think when installing to give an inclination of ≥ 50 mm
per metre toward the unit.
In order to avoid a water accumulation, fit the duct with an inclination toward the warm air heater.
3.4.4 Flue pipes length
 The maximum flue length of the exhaust gases and air intake is 9 meters (counting the bends) a
90° bend equal to1.5 m linear and a 45° bend equal to1 m linear. In case of roof terminal, the
distance between the top of the terminal and the roof has to be at least 0.5 m. Take into account
the presence of other ventilation systems or barriers close to the terminal outlet.
AMC 12 to 58
5760020 5760034

12
1775
O200
990
O130
HOH 225
max.300
300 690
HOH 225
O 130
O 200
AMC 78 to 116
5760035 5760038
3.5 Condensate discharge
The condensate discharge pipe is on the bottom of the heater. The siphon delivered with
the appliance shall be connected to this condensate discharge. A plastic tube Ø 40mm can be
connected to the siphon. The discharge system (not supplied by SBM) after the sifon
has to be ≥ Ø25mm and mounted with an inclination to the sewer. The advised inclination should be
minimum 30mm per meter. The horizontal length should not exceed 5 meters.
The condensate should be connected according to local and national regulations.
Do not let the condensate drip on the roof or roof edge outside the building, dangerous ice
can be formed in the winter. Condensate should be drained away to the sewer.
To be sure that the condensate can always flow out of the heater, an extra siphon should be
mounted before connecting to the sewer.
Before servicing the appliance, fulfil the siphon(s) with water in order to avoid
the dispersion of combustion products into the room.
If the appliance is mounted with an inclination between 0° and 45°, the condensate discharge will be
done in the front of the appliance (at the factory, the discharge is behind the appliance). Therefore, the
small sheet metal in the front of the heater can be removed and the pipe can be replaced to the front
of the heater.
!

13
4. APPLIANCE OPERATION
4.1 Generality
The unit can heat (in winter) as well as ventilate (in summer). By using the temperature-sensor on the
unit and the one in the room-thermostat, the temperature-difference between the two in the room is
monitored (see chapter 4.3).
If the desired temperature is not reached, the appliance will heat. The modulating burner gives the
exact quantity of necessary heat to reach a comfortable temperature.
4.2 Heat demand
If the thermostat indicates heat demand, the following cycle will start:
1) Pre-purge :
The electronic circuit board acknowledges the heat-demand and the premix
burner fan will start running for 30 seconds.
The display of the control print board indicates 1.
2) Ignition :
After 30 seconds of pre purge the electrode will spark for max. 5 seconds, the
gas valve is opened and the gas-air mixture will ignite
The display of the control print board indicates 2.
If the air/gas mix is not lighted or if there is no flame detected, the control print board start a second
ignition attempt before be in security state.
In this case, the display of the control print board indicates alternatively A and 1.
3) Heating :
Once the flame is detected, the unit will modulate to the desired load after 15 seconds.
The display of the control print board indicates b.
Depending on the given load, the system fan will start modulating (step-less) as well. The air heater
will always burn for a minimum of 4 minutes. This is to evaporate eventual condensation in the
discharge system.
4) End of heat demand :
When the heat demand ends, the burner will switch off and the system fan will continue to run for
around 3 minutes in order to cool the unit down
The display of the control print board indicates P.
The unit will try to ignite twice before lockout on flame fault. In the case of flame failure during
operation, the heater will attempt one restart.
When the heater is in lockout you see in the display intermittent an A and 1. On the display of the
MULTITHERM you will see failure 1.
4.3 Delta-T regulation (de-stratification fan mode)
When the difference of temperatures between the sensor on the unit (the NTC) and the sensor in the
MULTITHERM is bigger than the set value (factory setting standard 8°C), the burner is turning off and
only the main fan will operate at a regulated speed depending on the differential temperature
difference. This operation ensures an even temperature distribution throughout the building, thus
acting as a fully automatic variable de-stratification fan.
The Delta-T mode is working only in combination with the MULTITERM thermostat.
If you don’t desire to use the Delta-T regulation, it is possible to disable it in the parameters menu of
the MULTITHERM. See the technical instructions of the MULTITHERM.
4.4 Summer ventilation
It is possible to ventilate the ambient air with the AM unit independently from the heat demand through
the summer ventilation function of the MULTITHERM S or C. The summer ventilation can be set on 3
different speeds, see the technical instructions of the MULTITHERM.

14
4.5 Thermal protections
4.5.1 Protection of the exchanger
 The thermal protection of the exchanger is done by 2 CTN temperature probes set on the
exchanger of the unit.
In case of overheating of the exchanger, in a first time, the speed of the main fan will increase and
in a second time, the capacity of the burner will be limited at its minimum. In case of abnormal
overheating, the electric supply of the premix system will be closed. When the exchanger is cold
enough, the heat cycle restart (the display shows alternatively E and 1).
If the overheating continue (defective electrical supply cutting), the control board is going to a
safety state (the display on the board shows alternatively A and 2 and the MULTITHERM shows
the code 2).
After controlling and fixing, the control board shall be reset directly by pressing the button on the
control board or by the menu of the MULTITHERM (see the technical instructions).
4.5.2 Protection of the exhaust gases pipe
 For a use of plastic exhaust gases pipes on the warm air heaters, a sensor controls the exhaust
gases temperature (T < 120°C). When the exhaust gases temperature is too high (T > 110°C), the
burner decrease its power to the minimum.
Nevertheless the temperature increases and reaches 115°C, the burner stops. When, after a re-
ignition, the situation is the same, the heater is locked
(the safety board shows alternatively A and 7).
4.6 Pressure switch
The appliance is equipped with a pressure switch in order to control the combustion air flow through
the heat exchanger.
During the pre-ventilation step, the difference of pressure between inside and outside the exchanger is
measured.
If the difference of pressures is too weak, the display on the control board shows alternatively A and 9
which means a pressure drop in the heat exchanger which have to be checked.
4.7 Description of the control board
The control board controls all the functions of the AM heater and communicates with the thermostat
MULTITHERM.
The control board integrates the following functions :
- ModBus communication system with the MULTITHERM
- Ignition of the burner by sparks
- Flame detection by ionisation
- Modulation of the gas valve opening
- Modulation of the premix fan with information return
- Modulation of the main fan
- Heat protection of the exchanger (2 CTN sensors)
- Control of the ambiant temperature (CTN sensor)
- LED signals of the heater: heat demand (green LED) and safety state (red LED)
- Display of the heater state on the 8 segments screen
- Reset button
- Service mode function
- Recognition system of the appliance

15
View of the control board inside the heater
J2
Fuse 5AT
J4 J8
U11 S1 J12 J6
S2 S3
J9
T2
J15
J7
01
123 4 5 6 7 8
on Argus vision
J2 : connection for electric supply 230VAC
J4 : Connection for main fan and gas valve
J6 : Connection for MULTITHERM, thermostat, red and green lamps, pressure switch and identification of the appliance
(2 resistances)
J7 : Earth pin of the board
J12 : Connection of the 2 CTN probes
J15 : Connection of the ionisation probe
F1 and F2 : Fuses size 5x20 - 5A temporized.
U11 : 7 segment display.
S1 : reset button.
S2 : micro switch for use of the MULTITHERM thermostat with several heaters.
(factory setting of the micro switch 1 on ON position).
S3 : Micro switch for the electrical supply of the MULTITHERM.
T2 : connection of the ignition transformer
5. STARTING AND SETTING
5.1 Generality
The AMC heater was fully controlled and tested in factory before shipment. The combustion products
were measured in order to optimize the air/gas mix. Once installed, no setting is necessary. Only the
proper operation has to be checked.
Never turn the setting screw of the gas valve! (sealed).
Once the installation done according to these instructions, the warm air heater can be turning on. Be
sure that the gas pipe is clean, tight and purged. Set the appliance under electrical tension, open the
rear door to watch the first start and be familiar with the operation of the heater.
Ask for a heat demand, the warm air heater operates in heating mode during 4 minutes at least.
Even if there is an interruption of the heat demand.
If the mix air/gas is not lighted or if the flame is not detected, the control board tries a second ignition
before going in safety state if there is no flame.
Do not forget to inform the end-user about the following points :
- The way to use the appliance and the thermostat and particularly on the possibility to
reset the system.
- The possibility to disconnect the appliance in case of failure (gas valve, switch button).
- A regular maintenance is necessary.
F1 F2

16
5.2 Start by using the service button
By pressing the S1 button (reset / start) while around 10 seconds, the appliance will start a heating
cycle, the display of the control board will show alternatively L (Low) and the operation code:
1 = 30 sec of pre-ventilation
2 = 5 sec of ignition of the burner
b = 15 sec of flame stabilization
b = heating at low power
By pressing a second time on the S1 button, the appliance will operate at its full power, the display will
indicate alternatively H (High) and the operation code as described above.
By pressing a third time the S1 button, the appliance will operation under normal condition which
means according to the MULTITHERM heat demand.
5 minutes after the last impulsion on the S1 button, the service mode will be automatically deactivated.
5.3 Start by using the MULTITHERM thermostat
Create a heat demand on the MULTITHERM by setting a comfort temperature greater than the
measured temperature. The heating cycle will start:
pre-purge (30 sec), ignition (5 sec), flame stabilization (15 sec) and heating mode.
A heating cycle last at least 4 minutes.
5.4 Simulation du défaut de flamme et réarmement
After shutting the gas valve, the unit shall go in safety state:
 Post-ventilation (P)
 Pre-purge (1)
 Ignition (2)
 Post-ventilation (P)
 The display on the control board and the MULTITHERM show A 1.
 The red lamp of the unit is ligthing.
Check, by opening the gas valve and pressing the S1 button that the heating cycle restarts.
5.5 Control board display
Table of the operation codes of the warm air heater:
Display State Description
0
Stand-by The unit is ready to start
1
Pre-purge The control board measure the difference of pressure into the
exchanger and activate the pre-ventilation while 30 seconds.
2
Ignition Sparkling for 5 secondes, gas valve opening. Flame
detection while 5 seconds.
b
Heating After 15 seconds of flame statilization, the warm air heater
operates at the asked capacity. The appliance operates for 4
minutes at least.
P
Post-ventilation After stop of the burner, the exchange is cooled for 3 minutes
at small speed. Le pre-mix fan is still turning while1 minute.
F
Summer ventilation Only the main fan is operating during the summer ventilation
mode (activation using MULTITHERM thermostat)
F
blinking
Destratification fan
mode
The main fan is operating at its low speed during the
destratification fan mode.
Alternatively
L
and 1 (or 2 or b)
Low speed mode
Heating in low speed by pressing the
S1
button of t
he control
board.
Alternatively
H
and 1 (or 2 or b)
High speed mode
Heating in high speed by pressing the
S1
button of the
control board.

17
6. ADJUSTEMENT OF THE GAS VALVE
After starting the system, it is not necessary to set the gas valve, it was already done in the factory.
In case of replacement, only a qualified person is allowed to set the new gas valve.
An inappropriate setting can cause an overheating, a non-ignition of the burner or the
emission of carbon monoxide.
Use a calibrated combustion analyser and place the probe in the provided hole.
Offset adj.
Ratio adj.
P out
P offset
P in
In order to set the gas valve, there are 2 setting screws :
- Ratio screw : for the operation at low capacity
- Offset screw : for the operation at high capacity
Turning on the appliance at its high speed by pressing the servicing button S1 for 10 seconds then
press it again. The display shows alternatively H and b.
Research the appropriate CO2 values in the technical specifications of the table 5.
 1) Check the CO2 at high speed (High mode).
Decrease the CO2 by turning the Ratio screw in clockwise (less gas).
Increase the CO2 by turning the Ratio screw in anticlockwise (more gas).
 2) Then check the CO2 at low speed (Low mode) by pressing twice the S1 button, then press it for
10 seconds.
The CO2 level at low speed shall be lower than the CO2 level at high speed.
Decrease the CO2 by turning the Offset screw in clockwise.
Increase the CO2 by turning the Offset screw in anticlockwise.
After have set the CO2 at low speed, go back to high speed and readjust the CO2 level.
Then go back to low speed to eventually readjust the CO2 level.
Repeat these steps until the 2 values are correct.
Do never forget to check the CO level (carbon monoxyde) of the appliance !!!
Too much CO means mainly that the mix air/gas is to rich.
The CO value has to be always lower than 100 ppm.
In the case of AMC 78, 97 and 116 models, check respectively at low and high capacity the 2 heating
units and adjust if necessary.
After this control, the 2 units shall heat together.
Offset screw
Ratio screw

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7. TROUBLESHOOTING
7.1 Generality
In order to facilitate the fault detection, the display on the control board indicates a code which
corresponds to a diagnosis. On the MULTITHERM screen will appear a code too.
(See the diagnosis list below).
Take care of the reaction time of the heater (do not react too quickly!) as well as the warning LED.
Cause of default conducting to a safety state of the appliance and requiring rearming.
Display Default Cause / Solution
Al
ternatively
A
and
0
Internal default Defective control board, replace it
Alternatively
A
and
1
Ignition default While 5 seconds, presence of flame then the flame disappears :
Cause 1
No flame : Cause 2
Alternatively
A
and
2
Overheating of the
exchanger
Overheating default state of the heat exchanger:
Cause 3
Alternatively
A
and
3
Default of the
overheating probe
The overheating probe of the exchanger go to a default state:
Cause 4
Alternatively
A
and
4
Flame default
Flame default in repetition during t
he operation:
Causes 1
or
5
Alternatively
A
and
5
Internal default Defective control board, replace it
Alternatively
A
and
6
Default of the
overheating probe
Default of the electric connection:
Cause 10
Alternatively
A
and
7
Flame detection Ionisation without presence of flame :
check the electrode and the cable
Alternatively
A
and
8
Pre-mix default
The premix is not starting:
Cause 6
The premix is operating: Cause 7
Alternatively
A
and
9
Pressure switch
default
The burner fan is not working:
Cause 6
The burner fan is working: Cause 7
The combustion air through the heat exchange is not sufficient:
Cause 11
Cause of default conducting to a safety state.
After removing the defective part, the appliance will work again.
Display Default Cause / Solution
Alternatively
E
and
0
Internal default Defective control board, replace it
Alternatively
E
and
1
1
st
overheating probe Overheating of the exchanger, after cooling, the appliance will
restart: Cause 3
Alternatively
E
and
2
Appliance
identification default
The identification of the appliance is not correct:
Cause 8
Alternatively
E
and
3
Appliance
identification default
The identification of the device is not correct:
Cause 8
Alternatively
E
and
9
Problème lors du
réarmement
Repetition of the rearms in a
short time:
Cause 9
Cause 1 : While 5 seconds, presence of flame then the flame disappears.
- The flame is not detected. Check the ionisation probe and the cable.
(Electrical resistance shall be around 1 kΏ)
- Bad earth connection, hence a too weak ionisation current.
- The control board is defective, replace it
Cause 2 : No flame.
- No gas or gas pressure too weak. Check the gas pressure upstream the gas valve.
- The mix air/gas is not correct. Check the setting of the gas valve (page 15).
- The gas valve is not opening. Check, while sparkling that the electric supply of the gas valve is 230V.
- Check if there is sparks. Remove if necessary the ionisation probe or cable.
Cause 3 : Overheating of the exchanger.
- Overheating of the exchanger: check if the main fan is operating normally.
- Check the setting of the gas valve (page 15)

19
Cause 4 : the overheating probe of the exchanger go to a default state.
- The probe is compound of 2 resistances. Measure the resistance of each element.
The resistance values shall be 20kΩ at 25° and 25kΩ at 20°.
If they are varying too much, or if the difference between the 2 resistances is too big, replace
the probe.
- Do a rotation of a quarter turn of the probe (on its axis) in order to modify the surface of contact
where the temperature is measured.
Cause 5 : Flame default in repetition during the operation.
- Bad earth connection of the heater.
- The setting of the gas valve is not correct. Modify the setting (page 15).
- The combustion products duct is obstructed
Cause 6 : The premix is not starting.
- The premix is blocked: check the burner fan.
- The premix is under tension: check the wiring
Cause 7 : The premix is operating but not the appropriate speed.
- Check if the premix is not dirty.
- Check if the premix can turn freely.
- Check the electric wiring. (see the scheme at page 24 and 25)
Cause 8 : The identification of the appliance is not correct
- Check if the identification resistances are well connected on the control board. If necessary, replace
the identification resistances.
Cause 9 : Trouble when rearming the appliance.
- If in a short time, the rearming button was pressed to often, this default will disappear after some
time. By cutting the electric supply, this problem will be solved.
Cause 10 : The control board is not reacting.
- The J4 connector is not well engaged or there is a bad electrical connection between the terminals 5
and 11 of this connector.
- The control board is defective, replace it
- One of the 2 fuses is defective, replace it
Cause 11 : The combustion air through the heat exchange is not sufficient
- Check if there is no air leak inside the exchanger.
- Check the connection of the pressure switch and its operation.
Cause 12 : The exhaust gases sensor detects an error.
- The temperature of exhaust gases > 120°C, check the CO and CO2 values.
Check the settings of the gas valve (page 17)
- Bad connection of the temperature sensor: check the wiring
- Defective temperature sensor: the value of the resistance shall be 20kΩ at 25° and 25kΩ at 20°.
The warm air heater is working but there are other troubles
There is a detonated ignition of the burner.
- Check the gas valve setting: a proper CO2 level in the combustion products at high and low speed is
important for a good ignition.
- Check the ignition cable.
- Check the position of the ignition electrode, sparkling shall take place between the 2 electrodes and
not between an electrode and the burner.
Insufficient output of the heater.
- The heat provided by the appliance will be not sufficient if the pressure drops in the duct are too high.
In good conditions, the pressure drops of the exhaust gases are not greater than 30 Pa.
The main fan is not working or the rotation speed is not varying.
- Check the operation of the main fan by connecting it directly to the 230V. If the fan is working
properly, it means that the problem is coming from the control board because it sets the rotation
speed of the main fan between 800 and 1300 tr/mn. Replace the control board.

20
8. MAINTENANCE
The heater shall be controlled and if necessary cleaned regularly (at least one or two times a year) by
a qualified installer. This is especially important if the appliance is used in hard conditions such as
dusty or wet area or used with a high intensity.
8.1 Main inspection of the appliance
- Check the main state of the installation. Inspect the heater, the thermostat, the wires, the gas
pipe and the combustion products duct.
- Control the CO2 and CO level into the combustion products, as well at high speed that at low
speed (see chapter 6, page 17).
8.2 Appliance servicing
Before begin the servicing, shut the electric and gas supplies.
- Disassemble the burner/premix by unscrewing the 8 hex bolts.
- Check inside the exchanger that it is not dirty or damaged
- Check the state of the burner, if necessary, clean up the electrode helps to fine sandpaper.
Take care to not twist the electrode.
- Check the duct.
- Eventually clean inside the appliance with a vacuum cleaner.
- Clean outside the exchanger, the blades of the main fan with compressed air or a cloth
or a smooth brush. Do never use a metallic brush !
- Reassemble the burner (use new seals).
Once the servicing done, open the electric and gas supplies.
- Check once again the levels of CO2 and CO of the combustion products.
- Check the proper operation of the heater.
8.3 Ignition electrode
In order to obtain a proper ignition of the burner, it is important that the electrode is set correctly.
- The distance between the electrode and the burner have to be of 5.0 ± 0.5 mm.
5 ±0,5
- The distance between the 2 electrodes have to be of 3.6 ± 0.4 mm
3.6±0,4
- It is important that the sparkling take place between the 2 electrodes and not between one
electrode and the burner. It can conduct to a detonated ignition of the heater.