SUNTEC M2C User guide

1
Installation and operating
Instruction Gas Valve M2C
Combinaon Gas valve
with 2 safety valves and
constant pressure regulator
for light commercial
pressure jet burners.
Applicaon
The use of the SUNTEC M2 combinaon gas valve is recommended for all gaseous fuel
appliances where safety shuto and pressure control is required. It is suitable for use
with 1st, 2nd and 3rd family gases, according to EN 437, for inlet pressure up to 360mbar.
IIM2C - Ed.2 - May 2020
SUNTEC INDUSTRIES FRANCE - 1, rue Lavoisier - CS 60102 - F-21603 LONGVIC Cedex
Tel. [phone] - [email protected] - http://www.suntec.fr
Approvals
SUNTEC M2 combinaon gas valve meets all the specicaons of EN 13611, EN 126,
EN 88-1 and EN 161 standards. It complies with requirements of regulaon (EU) 2016/426
on appliances burning gaseous fuels (EC cercate : 1312CU6361).

2IIM2C - Ed 2 - May 2020
Technical specicaons
Gas Gas of 1st , 2nd and 3rd families, according to EN 437,
Maximum operang pressure : 360mbar.
Pipe sizes Inlet / outlet connecon with straight ange : DN15 (1/2’’) or
DN20 (3/4’’).
Internal thread according to EN 10226-1.
Torsion / Bending stress M2 gas valve fulll group 2 requirements, according to EN 13611.
Safety Valves (V1 and V2) Class A+A, according to EN 161.
Fast Opening < 0,5 sec. Fast closing < 0,2 sec.
V2 with ow limiter.
Pressure Regulator Class B according to EN 88-1.
Pressure regulang range : 4 to 20 mbar (M2C52F07)
4 to 50 mbar (M2C55F07)
Factory preseng : 10 mbar.
Supply voltage 230Vac +10% -15%, 50/60Hz (other voltage on request).
 34 VA, steady operaon.
Enclosure IP54 (with suitable connector) according to EN 60529.
Ambiant temperature
range
-20 °C to +60 °C.
Weight 2,3kg.
Minimum pressure switch

Factory mounted on inlet ange.
When suitable conguraon (see page 7), can be side-mounted
(«P3» tap).
Inlet strainer Fine square mesh : 0.6 mm, AISI 304 steel Ø 0.14mm wire.
 DIN 43650 form A plug connector (not supplied).
Independent supply for each safety valves. See page 6.
 Safety shut-o valves have been cered for 200 000 ON/OFF
operaons according to EN 161 standard.
Seals and gaskets All NBR compounds, B2H2 and B2H3 according to EN549.
 G 1/8 connecons supplied in 3 locaons on the gas valve (see
secon ‘‘Pressure taps / pressure plugs idencaon’’, page 7),
and on inlet/outlet anges.
Housing Aluminium.

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IIM2C - Ed 2 - May 2020
Flow curves
Operang principle
P  : Inlet pressure
P1 : Strainer pressure
P2 / P3 : Regulated pressure
P  : Outlet pressure
F : Strainer
P : Pressure regulator
V1 : Safety shut-o valve 1
V2 : Safety shut-o valve 2 with ow limiter
Dimensional drawings
P burner = 3mbar
Maximum ow can be reduced
when other anges are connected with.
Flange = 3/4’’

4IIM2C - Ed 2 - May 2020
Working principle
Safety valve
M2 gas valve comprises two class A automac shut-
o valves, electrically operated.
Each operator consists of a plunger connected to a
rubber seal. A closing spring presses the seal against
the seat, and thus ensures the ghtness of the valve.
At rest, both safety valves are closed; thus gas cannot
ow beyond chamber ①.
When energized independently or simultaneously,
the coils generate a magnec eld which moves
up the plunger, and releases the gas flow from
chamber ① to chamber ② for valve V1 (from ③
to ④ for V2).
A power-on indicator on the plasc cover lights up
as valve V1 is energized.
When de-energized, each safety valve closes within
0.2 second.
Pressure regulator
The M2 gas valve pressure regulator is normally
closed type, pneumatically operated by a servo
system.
system. The servo system controls the main regulator valve opening to equilibrate – through a
diaphragm – the downstream pressure ③ to a setpoint adjusted by the screw S.
A small valve in the servo system supplies the main diaphragm chamber ⑤ with upstream pressure
picked from chamber ②. When regulated pressure falls below the setpoint, the servo diaphragm moves
down opening the servo valve. This results in a pressure increase of the main diaphragm chamber
which opens the main regulator valve, and thus increases the regulated pressure. In return, when
the regulated pressure exceeds setpoint, the servo valve closes. A calibrated orice, which creates
a permanent leakage between the main diaphragm chamber and the regulated pressure chamber,
allows for the pressure to decrease, and thus the main regulang valve to close.
This design allows for excellent precision when regulang the downstream pressure, regardless to
upstream pressure variaon or downstream ow changes.
It also plays a role to soen the burner ignion : the progressiveness of regulang valve opening
combines with servo valve system to damp pressure peaks during transient phases. In some cases, it
can be an eecve alternave to slow opening devices.
Flow adjustment
A seng screw, located on the valve V2, limits the opening stroke of plunger. It can be used to
nely adjust the maximum gas ow.
①
②
③④
⑤
V1 V2
S

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IIM2C - Ed 2 - May 2020
Installaon

Please read carefully these instrucons before installing, commissioning or using the product !
Hazardous situaon or damaging the product may result from their non-observance.
Herein specied rangs and product markings must be checked to ensure compability with the
appliance.
The installaon must only be carried out by a qualied technician.
A complete check of the installaon must be carried out prior any start o.
• Turn o gas supply before installaon.
• Disconnect power supply to the product before servicing to prevent any
electrical shock and damage to the product
• The gas valve must be installed so that the gas ows in the same direcon
of the arrows. Reverse mounng may render valve inoperave.
• A complete check of the installaon must be carried out prior any start o.

Any mounng posion is allowed, as long as the safety valve axis do not point downwards as
shown below.

- Apply thread sealant, sealing yarn or PTFE tape to the pipe threads. Type and amount should meet
the vendor specicaons.
- Screw the anges onto the pipes.
- Check that the anges are aligned and that spacing is sucient to insert the valve between the anges
without damaging the O-ring seals.
- Remove inlet / outlet protecve sckers and insert the 2 O-rings into their grooves. If necessary,
small amount of grease can be used to hold them on.
- Fasten the valve to the anges using the supplied M5x20 screws. Make sure that the O-rings remain
in place during this operaon.
- Perform the electrical connecon according to ‘‘Electrical connecon’’ secon page 6.
Cauon
90° 90° 90° 90°
90° 90°
To prevent dirt from entering the gas valve during installaon, inlet/outlet protecve sckers should
only be removed at the last moment.

6IIM2C - Ed 2 - May 2020
Leak proof test
Check for gas leaks of all pipe connecons with a gas leak detecon spray. To ensure an eecve leak
test of all connecons, the gas valve must be energized (through the complete appliance) to raise
pressure all over the valve.
In case of leak detecon, gas supply must be shut o upstream and connecon ghtness redone.

All wiring must be executed in accordance with local codes and regulaons.
Lead wire should be selected to withstand maximum ambient and coil
temperature.
Cauon
Gas valve electrical connecon must be done with DIN 43650 form A connector (not supplied).
Gas valve wiring is shown below. Please refer to the appliance manufacturer instrucons for proper
wiring:
L1
L2
N
When the gas valve is powered, a green lamp lights up on the plasc cover. Please note that it is
supplied in parallel of valve V1, therefore it will not light up when only valve V2 is powered.
For pressure switch electrical connecon, please refer to pressure switch instrucons.
Gas valve adjustments

Regulang pressure can be adjusted through the screw S located
on the servo regulator ① as shown aside. Using a 3 mm hex key
to screw will increase the outlet pressure, whereas unscrew will
decrease the pressure.
While adjusting the pressure, pressure measurement can be
performed through the available pressure taps.
Flow adjustment
Flow can be adjusted by the screw located on the top of the valve
V2 with the help of a 3 mm hex key ②. Unscrew to increase the
ow, screw gently to decrease.
• When fully screwed, the valve seal may
be pressed against the seat. Do not apply
excessive torque to avoid damaging the seal.
Cauon

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IIM2C - Ed 2 - May 2020
M2 C 5 2 F 0 7 1 XXXX
Gas valve size (Body / Seat)
Pressure regulator type
C = Constant pressure regulator
Maximum inlet pressure / Valve class
5 = 360 mbar - A + A
Regulator pressure range
2 = 4-20 mbar
5 = 4-50 mbar
2nd safety valve opening
F = Fast opening
Safety valves type of supply
0 = Independent
Coils voltage
7 = 230V AC
Revision

- -

Default conguraon for M2 gas valve consists of 2 pressure taps (P2 and P ), and 2 plugs (P1 and
P3) as shown below.
P1
P2
P3
P OUT
P IN
P3 pressure tap can be modied upon demand (consult SUNTEC).
Following pressure signal can be selected :
- Valve V1 upstream pressure, aer strainer,
- Pressure between Valve V1 and pressure regulator,
- Regulated pressure (default conguraon),
- Valve V2 downstream pressure.
• To avoid any damage to the needle screw head, the use of an appropriate
screwdriver is strongly recommended.
• To ensure the pressure tap ghtness, ghtening torque must
be 1 to 1.5 N.m.
Cauon
Codicaon

8IIM2C - Ed 2 - May 2020
Pressure taps / Pressure plugs Maintenance
G1/8 Pressure taps ④ can be removed using a 5 mm hex key and 4 mm hex key for G1/8 Pressure
plugs ⑤. Pressure plugs and pressure taps are fully interchangeable.
Only SUNTEC pressure taps and plugs, equipped with suitable EN 549 O-ring can be used for
replacement.
- Unscrew the plug/tap with the appropriate hex key,
- Place and screw the new plug/tap with a 3.5 N.m torque.

Unscrew the anges screws ⑥ and take out the gas valve from anges. Remove the strainer ⑦ with
a small tool such as at screwdriver. Replace the stainer. Insert the gas valve between the anges,
screw the anges and check for ghtness according to secon “Leak proof test”, page 6.
• Any disassembly other than menoned above is strictly forbidden.
• Aer any violent shock, such as an accidental dropping, the gas valve shall
not be used anymore ; Internal and external ghtness cannot be guaranteed.
Cauon
Spare parts / accessories list
Pos.  Packing Reference
- Inlet/Outlet Flange with pressure tap x 1 -
- Inlet/Outlet Flange with pressure switch x 1 -
- Inlet/Outlet Flange with pressure plug x 1 -
④Pressure tap G1/8 incl. O-ring x 10 -
⑤Pressure plug G1/8 incl. O-ring x 10 -
⑦Inlet Strainer x 10 -
②Coil assembly x1 -
Maintenance
Only the following items can be replaced during
maintenance operaon :
- Coil Assembly,
- G1/8 Pressure taps / Pressure plugs,
- Inlet strainer.
Coil Assembly Maintenance
The coil assembly consists of two coils, one electronic
board and a plasc cover. It must not be modied,
repaired nor dismantled.
①
②
③
④
⑤
⑥
⑦
Replacement procedure :
- Remove both clips ① by pulling them sidelong,
- Li and remove the Coil Assembly ②,
- Place the new Coil Assembly so that coils slot
together with tubes ③,
- Push both clips ① to fasten the new Coil Assembly.