TECHNICAL FEATURES - Romstal

TECHNICAL FEATURESElectricControls810 ELETTROSITSafetyAdjustmentThermoelectric Automatic On/off High/low Modulating Gas/airNOVA SERIES820 NOVA822 NOVA824 NOVA825 NOVA826 NOVA827 NOVA822 NOVAMIX828 NOVAMIXTANDEM SERIES830 TANDEM836 TANDEM837 TANDEMSIGMA SERIES840 SIGMA843 SIGMA845 SIGMA848 SIGMA

824-825 NOVAMAIN FEATURES• Electric gas flow modulating device with mechanicaladjuster for minimum and maximum gas outlet pressure:stepped (824 NOVA) or continuous (825 NOVA).• Three position (off, pilot, on) control knob.• Thermoelectric flame failure device with restart interlock.• Near-silent automatic shut-off valve.• Servo-controlled pressure regulator.• Step ignition device (optional).• Pilot outlet with gas flow restrictor.• Inlet and pilot filters.• Inlet and outlet pressure test points.• Threaded gas inlet and outlet with provision for flangeconnection.• Connection for pressure regulator/combustion chambercompensation.DESCRIPTION1 Control knob1 2 3 42 Gas pressure modulating device3 Adjustment screw for gas flow to thepilot64 Thermocouple connector5 Alternative thermocouple connector6 Provision for accessories support bracket7 Inlet pressure test point7 8 9108 Outlet pressure test point9 ON-OFF solenoid valve10 Pilot outlet1111 Main gas outlet12 Holes (M5) for fixing flanges13 Supplementary valve body fixing points1214 Connection for pressure regulator/combustion chamber compensation51413194824/825 NOVA

CODES824 NOVACodes AmbientTemperaturerangeInlet Outlet EV Electric supply EVClassTC connection Pressure regulator Step opening0824010 0 to 60°C Rp 1/2 Rp 1/2 220/240 V - 50 Hz D M 9x10824011 0 to 60°C Rp 1/2 Rp 1/2 220/240 V - 50 Hz D M 9x10824012 0 to 60°C Rp 1/2 Rp 1/2 220/240 V - 50 Hz D 11/32 ASA0824013 0 to 60°C Rp 1/2 Rp 1/2 24 V - 50 Hz D M 9x12-50 mbar - (black screw)(green solenoid) 230 V2-50 mbar - (black screw)(green solenoid) 230 V2-50 mbar - (black screw)(green solenoid) 230 V2-50 mbar - (black screw)(brown solenoid) 24 VStandard stepopening: 3÷5 mbarNo step openingStandard stepopening: 3÷5 mbarNo step opening825 NOVACodes AmbientTemperaturerangeInlet Outlet EV Electric supply EVClassTC connection Pressure regulator Step opening0825010 0 to 60°C Rp 1/2 Rp 1/2 220/240 V - 50 Hz D 11/32" ASA 2-20 mbar 28VStandard stepopening (3÷5 mbar)0825011 0 to 60°C Rp 1/2 Rp 1/2 220/240 V - 50 Hz D M9x1 3-37 mbar 28VStandard stepopening (3÷5 mbar)0825013 0 to 60°C Rp 1/2 Rp 1/2 220/240 V - 50 Hz DM9x1 with ECO 2-20 mbar 28V and special Standard stepconnection calibration (3.5 - 15 mbar) opening (3÷5 mbar)Standard step0825015 0 to 60°C Rp 1/2 Rp 1/2 220/240 V - 50 Hz D 11/32" ASA 3-37 mbar 28Vopening (3÷5 mbar)0825017 0 to 60°C Rp 1/2 Rp 1/2 220/240 V - 50 Hz D 11/32" ASA 3-37 mbar 28V No step opening0825019 0 to 60°C Rp 1/2 Rp 1/2 220/240 V - 50 Hz D 11/32" ASA 2-18 mbar 16V white solenoidStandard stepopening (3÷5 mbar)0825020 0 to 60°C Rp 1/2 Rp 1/2 220/240 V - 50 Hz D M9x1 3-37 mbar 16VSpecial step opening(2÷3mbar)0825021 0 to 60°C Rp 1/2 Rp 1/2 220/240 V - 50 Hz D M9x1 3-37 mbar 16V No step opening0825023 0 to 60°C Rp 1/2 Rp 1/2 220/240 V - 50 Hz D 11/32" ASA 3-37 mbar 28VStandard stepopening (3÷5 mbar)0825024 0 to 60°C Rp 1/2 Rp 1/2 220/240 V - 50 Hz DM9x1 with ECO 2-20 mbar 28V and special Standard stepconnection calibration (3.5 - 15 mbar) opening (3÷5 mbar)Standard step0825030 0 to 60°C Rp 1/2 Rp 1/2 24 V - 50 Hz D M9x1 2-20 mbar 28Vopening (3÷5 mbar)0825031 0 to 60°C Rp 1/2 Rp 1/2 24 V - 50 Hz D M9x1 3-37 mbar 28VStandard stepopening (3÷5 mbar)0825032 0 to 60°C Rp 1/2 Rp 1/2 24 V - 50 Hz D M9x1 7-50 mbar 28VStandard stepopening (3÷5 mbar)0825036 0 to 60°C Rp 1/2 Rp 1/2 24 V - 50 Hz D 11/32" ASA 3-37 mbar 28VStandard stepopening (3÷5 mbar)0825039 0 to 60°C Rp 1/2 Rp 1/2 24 V - 50 Hz D 11/32" ASA2-20 mbar 28V and special Special step openingcalibration (3.15 - 16.15 mbar) (2÷3mbar)0825636 32 to158°F 3/8 NPT 3/8 NPT Millivoltage version D 11/32" ASA 9-25 mbar 28V No step opening824/825 NOVA

196824/825 NOVA

SPARE PARTSN. Code Description Q.ty N. Code Description Q.tyA 0.006.245 Magnet unit with lead-faston 5and insulating plateB1 0.928.850 Modulating cartridge 2-20 mbar (825 NOVA) 5B2 0.928.851 Modulating cartridge 3-37 mbar (825 NOVA) 5B3 0.928.852 Modulating cartridge 7-50 mbar (825 NOVA) 5C 0.947.033 Outlet filter 100D1 0.967.064 EV2, 220/240 V, 50 Hz solenoid and screws 5D2 0.967.065 EV2, 24 V, 50 Hz solenoid and screws 5D3 0.967.066 EV2, 220/240 V, 50 Hz solenoid 5with top exit and screwsE1 0.967.135 220 V modulating solenoid (824 NOVA) 5rectified ACE2 0.967.097 Modulating solenoid for 825 NOVA 5ACCESSORIESN. Code Description Q.ty N. Code Description Q.ty1 0.073.953 Piezoelectric ignition switch with nut 52 0.903.094 Cover for EV2 solenoid including screw 103a 0.906.258 Rp 3/4” elbow flange with O-ring and 104 screws3b 0.906.260 Rp 1/2” elbow flange with O-ring 10and 4 screws4a 0.906.259 Rp 3/4” straight flange with O-ring 10and 4 screws4b 0.906.261 Rp 1/2” straight flange with O-ring 10and 4 screws5 0.925.054 O-ring for flange 106a 0.927.011 Electric ignition switch without cables 106b 0.927.012 Electric ignition switch with cables 10(L = 920 mm)7 0.953.303 M4x8 screw for piezo support 108a 0.958.030 ø 4 mm pilot tube shear-off 108b 0.958.031 ø 6 mm pilot tube shear-off 108c 0.958.032 ø 1/4” pilot tube shear-off 109 0.958.057 N.G. vent connection 10010a 0.960.015 EV2 plug and lead L = 1,000 mm 1010c 0.960.019 EV2 plug L = 1,000 mm 20earth hole larger – no earth cable12 0.960.018 Step modulator plug with integrated 5rectified circuit (824)13 0.978.099 Support for piezo igniter 1015 0.999.994 Min-max modulator adjusting tool 5Subject to change without notice824/825 NOVA