Use And Installation Instructions; Main Characteristics; Technical Data - SIT Group 824 NOVA Manual De Instrucciones

USE AND INSTALLATION
INSTRUCTIONS
Single-knob operated, thermoelectric multi-functional gas valves with High-Low-Off (824 NOVA) or full modulating
(825 NOVA) gas flow control. All the adjustments can be made from the top face.

MAIN CHARACTERISTICS

Three positions control knob: off, pilot, on (MS)
Thermoelectric flame failure device with re-start interlock (GM)
Automatic shut-off valve (EV) class D (class C upon request)
Servo system pressure regulator (PR)
Step modulating (824 NOVA) or full modulating device (825 NOVA) with mechanical adjustments for maximum and
minimum gas rates (MD)
Step opening ignition device (optional) (SO)
Pilot outlet with flow restrictor (RQ)
Inlet and outlet pressure test points
Inlet and pilot strainer (FL)
Connection for burner chamber pressure compensation (optional)
WORKING DIAGRAM
MS
FL
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
Working temperature range
Max. gas inlet pressure
Manual shut-off
N° of cycles expected
Thermoelectric flame-failure device
(using SIT series 200 or 290 thermocouples)
Ignition time
shut-off time
N° of cycles expected
Automatic shut-off valves
class
opening and closing time
Pressure regulator
Step modulating device (824 NOVA)
Max. outlet pressure range
Min. outlet pressure range
Full modulating device (825 NOVA)
Standard outlet pressure setting range
Assembly position
Gas families
Gas connections
4
GM
MD
PR
FL RQ
group 2
0...60°C
60 mbar
5,000
< 10 s
< 60 s
5,000
D
≤ 1 s
class B
7...50 mbar
2...45 mbar
2...20 mbar
5...37 mbar
7...50 mbar
any position
I, II and III
Rp 1/2 ISO 7
GB
EV
SO
MAIN
BURNER
PILOT
BURNER
(-20...+60°C upon request)
(class C upon request)
(version 240 V: 7...37 mbar)
(version 240 V: 2...30 mbar)
(white setting screw)
(red setting screw)
(black setting screw)