Main Features; Technical Data - Sit 827 NOVA Manual Del Usuario

Multifunctional control with two automatic on-off valves and a modulating device. The Multifunctional control is for use
with appliances provided with automatic ignition systems and flame failure device, with or without intermittent pilot
burner, and is suitable for use with gas of all three families.
All the adjustment operations can be carried out from the top.
The designed lifetime* of this product is 500 000 cycles or 10 years (based on date code) according to the standard
EN 126 and the table on designed lifetime as stated in the Afecor document, see http://www.afecor.org/news.html.
This lifetime is based on the use of the control in accordance with the appliance manufacturer's instructions.
Regular inspection of the control by authorized personnel in accordance with guidelines of the appliance manufacturer is
required.
After reaching the designed lifetime the product has to be replaced by authorized personnel.
*
The warranty as opposed to the designed lifetime is described in the delivery terms.

MAIN FEATURES

Two automatic on-off valves, silent operation:
EV1 in class B (on request: class A)
EV2 in class D (on request: class C)
Servo-controlled pressure regulator (RP)
Modulating device (MD)
Slow ignition device (on request) (SO)
Pilot outlet (plugged on request) with gas flow rate preselection (RQ)
Inlet and outlet pressure test points
Inlet filter and pilot filter (FL)
Outlet for the connection of the pressure regulator to the combustion chamber (on request).
WORKING DIAGRAM
GAS
INLET

TECHNICAL DATA

The technical data specified below refer to the European standard, EN 126 "Multi-functional controls for gas-burning appliances".
Torsion and bending resistance
Automatic valve EV1
Automatic valve EV2
Pressure regulator (RP)
Outlet pressure setting range
Ambient working temperature
Max. gas inlet pressure
Safety solenoid opening and closing time
Installation position
Main gas connections
GAS FLOW
Q [m 3 /h d=0,6 class B+D]
10
8
6
4
2
4
0
5
PR
FL EV1
FL
CLASS B + D
I Family (d=0.45) Q = 7.5 m
II Family (d=0.6) Q = 6.5 m
III Family (d=1.7) Q = 8.1 kg/h
CLASS B + C
I Family (d=0.45) Q = 5.3 m
II Family (d=0.6) Q = 4.6 m
III Family (d=1.7) Q = 5.8 kg/h
10
MD SO
RQ
Group 2
Class B
Class D
Class B
2-20 mbar
3-37 mbar
7-50 mbar
0-60°C
60 mbar
≤ 1 s
any position
Rp 1/2 ISO 7-1:1982
3
/h ∆p = 5 mbar I Family (d=0.45)
3
/h ∆p = 5 mbar II Family (d=0.6)
∆p = 5 mbar III Family (d=1.7)
3
/h ∆p = 5 mbar I Family (d=0.45)
3
/h ∆p = 5 mbar II Family (d=0.6)
∆p = 5 mbar III Family (d=1.7)
EV2
MAIN
BURNER
PILOT
BURNER
(on request class A)
(on request class C)
(white screw)
(red screw)
(black screw)
Flow Q as a function
of the pressure drop ∆p
CLASS A + D
3
Q = 5.1 m /h ∆p = 5 mbar
3
Q = 4.4 m /h ∆p = 5 mbar
Q = 5.5 kg/h ∆p = 5 mbar
CLASS A + C
3
Q = 3.7 m /h ∆p = 5 mbar
3
Q = 3.2 m /h ∆p = 5 mbar
Q = 4.0 kg/h ∆p = 5 mbar