Datasheet Content
SIT Group
8 2 0 N O VA
M U LT I F U N C T I O N A L G A S C O N T R O L
THERMOELECTRIC FLAME SUPERVISION DEVICE
SERVO-CONTROLLED PRESSURE REGULATOR
AUTOMATIC SHUT-OFF VALVE
PIN 63AP7060/2
M U LT I F U N C T I O N A L
GAS SINGLE-CONTROL
Multifunctional control with
thermoelectric flame
supervision device,
single-control knob (Off, Pilot,
On), restart interlock,
servo-controlled pressure
regulator, on/off electric
solenoid.
A step opening ignition device
can be fitted on request.
The 820 NOVA is suitable for use with boilers,
catering equipment, hot air generators, radiators
and other heating appliances.
MAIN FEATURES
Control knob with Off, Pilot and On positions.
Thermoelectric flame supervision device with re-start interlock.
Near silent shut-off valve.
Servo-controlled pressure regulator.
Step opening ignition device (optional).
Main gas flow control (optional).
Pilot outlet with gas flow adjustment screw.
Inlet and pilot filters.
Inlet and outlet pressure test points.
Threaded gas inlet and outlet with provision for flange connection.
Connection for combustion chamber pressure regulator compensation.
DESCRIPTION
1 Control knob 9 Actuation valve
2 Pressure regulator cap screw 10 Pilot outlet
3 Pilot gas rate adjuster 11 Main gas outlet
4 Thermocouple connection 12 Holes (M5) for mounting flange
5 Alternative thermocouple connection 13 Supplementary fixing points for valve
6 Provision for accessories support 14 Connection point for combustion
bracket chamber pressure regulator
7 Inlet pressure test point compensation
8 Outlet pressure test point
10
1 2 3 4
11
6
12
7 8 9 13
5
14
TECHNICAL DATA
• Gas connections: Rp 1/2 ISO 7 ELECTRICAL DATA
• Installation positions: any
• Gas families: I, II and III Supply Voltage (AC) Consumption (mA)
• Maximum gas inlet 240 V 50 Hz 25
pressure: 60 mbar 220 V 50 Hz 20
• Maximum outlet pressure 220 V 60 Hz 25
setting range: 3...30 mbar (optional 20...50) 24 V 50 Hz 210
• Working temperature 24 V 60 Hz 220
range: 0...70 °C (optional -20... +60°C)
• Pressure regulator: Class B Electrical protection rating IP54 using 160-type connectors
• Automatic shut-off valve: Class D (Class C on request) with screw and gasket - code
0.960.104
Data refer to EN 126
DIMENSIONS
GAS FLOW AS A FUNCTION OF PRESSURE LOSS
Q [m3/h d=0,6]
CLASS D
CLASSEDD
10 I Family (d = 0.45) Q = 7.5 m3/h ∆p = 5 mbar
CLASSEC C
CLASS
II Family (d = 0.6) Q = 6.5 m3/h ∆p = 5 mbar
8
III Family (d = 1.7) Q = 8.1 kg/h ∆p = 5 mbar
6
CLASS C
4
I Family (d = 0.45) Q = 5.3 m3/h ∆p = 5 mbar
2
II Family (d = 0.6) Q = 4.6 m3/h ∆p = 5 mbar
0 III Family (d = 1.7) Q = 5.8 kg/h ∆p = 5 mbar
5 10
∆p [mbar]
ACTUATION
Pilot flame ignition
Press the control knob and rotate to Pilot .
Press the knob and ignite the pilot flame, keeping the knob fully fig. 1
depressed for a few seconds (fig. 1).
Release the knob and check the pilot flame stays on, otherwise repeat the
ignition procedure.
Main burner ignition
Slightly depress the control knob and rotate to On (fig. 2).
When the automatic valve is powered, the gas flow to the main burner is
fig. 2
opened.
Valves with a step opening ignition device reach the maximum rate of
flow after approx. 10 seconds.
Pilot position
To keep the main burner off and the pilot flame on, slightly depress the
control knob and rotate to Pilot .
fig. 3
Shut-down
Slightly depress the control knob and rotate to Off (fig. 3).
CAUTION: The re-start interlock device prevents the appliance from
re-igniting until the flame supervision device has interrupted the gas flow.
After this stage (i.e. when the magnet unit has closed) it is possible to re-
ignite the appliance.
GAS FLOW SET TO EN 88
Q = [m3/h d=0.6]
14
12 CLASS C
10
Inlet pressure range
8
Type of gas
2L
6 Nominal Max. Min.
4 2H 20 25 17
2H 2L 25 30 20
2
Outlet pressure tolerance +10%...-15%
0
6 8 10 12 14 16 18
Pu [mbar]
Q = [m3/h d=0.6]
14
12 CLASS D
10
Inlet pressure range
8 2L
Type of gas
6
Nominal Max. Min.
4 2H 20 25 17
2H
2 2L 25 30 20
0 Outlet pressure tolerance +10%...-15%
6 8 10 12 14 16 18
Pu [mbar]
INSTALLATION
Main gas connection
The connection must be made using gas pipes with Rp 1/2 ISO 7. Torque: 25 Nm.
If optional flanges are used, first screw the pipes onto the flanges and then the flanges
onto the valve. Recommended torque for flange fixing screws: 3 Nm.
Connection to the pilot burner
Ø 4 mm, Ø 6 mm or Ø 1/4 pipes can be used. Use appropriately sized nut and olive.
Tighten to 7 Nm torque.
Connection to the combustion chamber
The “air” section of the pressure regulator may be connected to the combustion chamber
if the latter is under pressure.
Use the SIT fittings provided. Torque: 1 Nm
Electrical connections
The use of special connectors is recommended for the mains powered versions. In order to
ensure that the valve is connected to the appliance’s earth circuit, always use the power
connector with the earth terminal, fixing it with the appropriate screw.
The 24 VAC versions must be powered by an isolating transformer (at a very low safety
voltage as per EN 60742). Use AMP 6.3x0.8 mm DIN 46244 terminals for the connection.
Make the connections according to the specific standards for the appliance.
All relevant safety devices (e.g. the overheat thermostat) must cut off the power supply to
the magnet unit.
CAUTION: When all the connections have been completed, check the gas seals and wiring
insulation.
V~
2
4
6
8
10 12
WIRING DIAGRAMS V~ Ambient thermostat
SETTINGS AND ADJUSTMENTS
Checking the inlet and oulet pressure
Loosen the test-point screws provided to
check inlet and outlet pressure.
Tighten the screws to the recommended
torque of 2.5 Nm.
Adjusting the outlet pressure
Remove the plug (A), turn the screw (B)
clockwise to increase outlet pressure
and anticlockwise to reduce it. After setting,
ensure plug (A) is properly secured.
Overriding the pressure regulator
For conversion to operation on third family
gases replace the plug (A), the adjustment
screw (B) and the spring (C) with the…
