Summary of Contents for REXNOVA ISA 20 BITHERMAL
- Page 1 G20 ENGINEERING A brand by 20kw Bithermal Wall-hung boiler with integrated heat exchanger INSTALLATION, COMMISSIONING, USE AND MAINTENANCE MANUAL ITALIAN DESIGN...
- Page 3 ISA 20 KW BITHERMAL BOILER MANUAL VERS. 07/2016 - REV.1...
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Page 4: Table Of Contents
CONTENTS General requirements - Checking the effectiveness of combustion gas - General information evacuation Use and operation - Combustion gas evacuation circuit diaphragms 16 - Unit description - Air intake and combustion gas evacuation system: - Components warnings - Interface description Adjustment and maintenance - Season selection menu - Preliminary maintenance operations... -
Page 5: Use And Operation
USE AND OPERATION DESCRIPTION OF THE BOILER 20kW BITHERMAL Isa wall hung boiler opens elegant look, having a simple and intuitive the range of Isa boilers. interface board, 20kW BITHERMAL Isa boiler is Assembled with care, by using high quality recommended when efficiency and simplicity components, showing a compact and are needed. -
Page 6: Interface Description
INTERFACE DESCRIPTION Pict. 3 A. DHW TEMPERATURE INCREASE B. DHW TEMPERATURE DECREASE C. CH TEMPERATURE INCREASE D. CH TEMPERATURE DECREASE E. FUNCTION SELECTION F. RESET BUTTON TURNING THE BOILER ON TURNING THE BOILER OFF Turn on the boiler’s electrical supply by the Pushing several times the “E”... -
Page 7: Temperature Setting Menu
display; during an intake of DHW water, The HEAT ONLY mode is activated the DHW temperature is shown together by pushing “E” button and then the with the flashing “TAP” symbol and “RADIATOR” symbol is displayed (Pict. 6). with the “FLAME” symbol of the ignited In this mode, the unit will fulfill CH burner;... -
Page 8: Operating By Room Thermostat
OPERATING BY ROOM THERMOSTAT In compliance with current standards in ASK YOUR AREA INSTALLER FOR INFORMATION ABOUT INSTALLATION terms of energy saving, the device must be A N D F U N C T I O N I N G O F R O O M connected to a room thermostat for optimal THERMOSTAT temperature adjustment and maintenance... -
Page 9: Fault Codes Table
To manually reset the system following a fault IF A FAULT IS NOT SOLVED AFTER 2 MANUAL RESET ATTEMPTS, THE condition, press “F” button (Pict.3). AUTHORISED AFTER SALES SERVICE If the operation is successful the boiler will return MUST BE CONTACTED. to normal operation;... -
Page 10: Installation
INSTALLATION OPERATING DIAGRAM Pict. 8 1) Primary heat exchanger 2) Burner 3) Gas valve 5) Safety valve 6) Filling loop cock 7) Hot water priority turbine 9) Circulator unit 10) Expansion tank DOMESTIC WATER CH FLOW INTAKE HOT WATER INTAKE RETURN ELECTRICAL WIRING DIAGRAM Pict. -
Page 11: Graphs For The Head Available To The System
GRAPHS FOR THE HEAD AVAILABLE TO THE SYSTEM Pict. 10 for 15-50 (Symona 20Kw) 1020 1080 1140 1200 1260 Q L/h INSTALLATION Use: • Do not install the boiler in environments The boiler has been constructed according containing dust or strong vapors. to current technical standards and the most The presence of substances such as fluorine, stringent safety rules. -
Page 12: Fastening The Boiler To The Wall
Pict. 11 FASTENING THE BOILER TO THE WALL Pict. 12 Attach the cardboard template giving the connection and fastening schemes to the wall, paying attention to the boiler dimensions and necessary clearances. (Pict. 12) • Use a suitable bit to drill the holes indicated by the two wall plug symbols on the template. -
Page 13: Layout Of Connections
LAYOUT OF CONNECTIONS Pict. 13 CONNECTION TO HYDRAULIC SYSTEM Connect the water and central heating • Ensure that the line is always at pipes to the boiler, respecting the positions atmospheric pressure by using and distances indicated (Pict. 12); take suitable traps (do not connect particular care when connecting pipes to pipes directly to the valve outlet) -
Page 14: Filling The System
FILLING THE SYSTEM When all of the boiler connections have been Perform the filling and topping plumbed in, it is possible to proceed to fill the up of the system with the boiler completely off and all parts at central heating circuit. Perform the operation room temperature. -
Page 15: Connection To The Mains Electrical System
Check that all connections are Do not use the gas supply perfectly tight before opening pipework connections as earth the boiler’s gas connection. points for electrical equipment. C h e c k t h a t a l l d e v i c e s Always install a gas shut-off n e c e s s a r y f o r c r e a t i n g valve before the device. -
Page 16: Combustion Gas Evacuation System: Compatible Applications
A qualified electrician should Extensions, adaptors or gang check the suitability of the sockets must not be used when protective earth system. The connecting the device to the manufacturer is not responsible mains electrical system. for any damage caused by the lack of a suitable system earth. -
Page 17: Combustion Gas Evacuation System: Installation
COMBUSTION GAS EVACUATION SYSTEM: INSTALLATION The boiler, based on its UNI 7129 classification, components necessary for completing the can be connected to COAXIAL intake and line, including changes of direction, straight flue evacuation systems. sections of various lengths, connections to The “coaxial”... -
Page 18: Combustion Gas Evacuation Circuit Diaphragms
CHECKING THE EFFECTIVENESS OF THE COMBUSTION GAS EVACUATION SYSTEM Check the installation of the air/exhaust The detected value shall not be less than system (for any possible flue system type) by shown in the table “FLUE SYSTEMS TECHNICAL detecting the pressure of the fan exhaust CHARACTERISTICS“, column “SIGNAL”... -
Page 19: Air Intake And Combustion Gas Evacuation System: Warnings
DIAPHRAGM COAXIAL SYSTEM Diaphragm diameter FROM LENGTH TO LENGTH 20kW BITHERMAL Isa 0.5 meters 1 meter 37 mm > 1 meter 2 meters 41 mm > 2 meters 3 meters 41 mm > 3 meters 4 meters 44 mm > 4 meters 5 meters ALWAYS CONNECT A MINIMUM FLUE EVACUATION AND INTAKE SECTION FOR BOTH SYSTEMS OF AT LEAST 0.5 METERS (COAXIAL PIPE L= 0.5m + 90°... -
Page 20: Adjustment And Maintenance
ADJUSTMENT AND MAINTENANCE All maintenance operations MUST BE a qualified technician at the end of every PERFORMED BY QUALIFIED PERSONNEL. heating season (winter) and whenever else These operations must also be performed in full it is considered necessary in order to keep it compliance with all applicable legislation and in perfect operating conditions. - Page 21 Pict. 20 MAKE SURE THAT: THE CENTRAL HEATING SYSTEM IS CHARGED AND PRESSURISED; ANY SHUT-OFF VALVES FITTED TO THE CH FLOW AND RETURN AND ON THE GAS LINE ARE OPEN; THE GAS SUPPLY IS AVAILABLE; ANY CONTROL VALVES ARE TURNED TOWARDS THE SYSTEM; THE SPECIFICATIONS FOR CORRECT INSTALLATION AND COMMISSIONING OF THE BOILER HAVE BEEN OBSERVED.
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Page 22: Power Adjustment
Pict. 21 - TECHNICAL DATA PLATE INDICATING GAS TYPE REXNOVA ISA20KWBTST In any case, before running the device it is applicable legislation and regulations and ALWAYS necessary to check the following that the manufacturer’s specifications and... -
Page 23: Gas Pressure Check
the device, where applicable, is tested for Commissioning / periodically: tightness. - Check that the above specifications have - That the gas line meets all applicable been maintained and that the boiler is in legislation and regulations, in particular: That perfect working order. -
Page 24: Checking Mains Gas Supply Dynamic Pressure
Pict. 24 CHECKING THE MAINS GAS SUPPLY DYNAMIC PRESSURE • - Use the SERVICE function to bring the boiler to • Check that the value measured with the maximum power. manometer falls within the max-min interval given • - Measure the gas pressure before the regulator in the “Dynamic mains supply pressure”... -
Page 25: Checking Pressure At Burner At Maximum Power
CHECKING PRESSURE AT BURNER AT MAXIMUM POWER If the measured value does not correspond • Activate the SERVICE function and m e a s u r e t h e g a s p r e s s u r e a f t e r to the table, adjust the external adjustment the regulator by connecting the screw on the gas valve until it does, turning... -
Page 26: Configuring The Software For A Change In Gas Type
- Replace the burner tray pack, fastening it to Injector type Boiler Injector No. Natural Gas Isa 20 Bithermal NP Ø 1.3 mm NP Ø 0.77 mm After all the gas injectors have been THE CORRECT, SAFE AND COMPLIANT replaced, check and update, if necessary,... -
Page 27: Accessing The Configuration Menu
THE USE OF INJECTORS DIFFERENT THAN THOSE SPECIFIED CAN ENDANGER PERSONS AND PROPERTY. CHECK THAT THE BURNER TRAY PACK AND ALL OTHER PREVIOUSLY REMOVED COMPONENTS ARE CORRECTLY POSITIONED BEFORE CONNECTING THE GAS SUPPLY AND STARTING THE BOILER. BEFORE COMMISSIONING THE NEWLY CONFIGURED BOILER IT IS NECESSARY TO CHECK THE GAS SUPPLY PRESSURE BEFORE THE BOILER AND MEASURE AND ADJUST THE GAS PRESSURE AT THE BURNER. -
Page 28: Installer Menu
INSTALLER MENU Page Description Default Gas set-up 0 =NATURAL 1= LPG Max. Burner power % Ignition power % Anti frequent ignition parameter (minutes) 0 minutes Heating burner tray time (minutes) 1 minute CH Post circulation time (seconds) 180 seconds DHW Post circulation time (seconds) 60 seconds Anti Water-hammer delay (seconds) Heating start delay (seconds) -
Page 29: Room Thermostat Installation
ROOM THERMOSTAT INTALLATION It is recommended, and in many cases - Identify the two-pole terminal board located mandatory, to connect the boiler to a on the left-hand side of the PCB. Disconnect device which monitors and regulates the any cable which may be present by loosening temperature in the areas served by the boiler the terminal screws and remove it completely itself. -
Page 30: Special Functions
SPECIAL FUNCTIONS ANTI-FROST: circulation is activated, the diverter valve This function is always active, whatever mode (when present) switched to the CH circuit and the boiler is in. the burner lit at minimum power. In order to allow this function to fulfill its When the temperature measured by purpose, the device must be: the sensor reaches 8°C, the function is... -
Page 31: Technical Data Sheet
TECHNICAL DATA U.M. Isa 20 Bithermal Category II2H3P NOx Class Type B22p-C12-C32 Gas used G20/G31 Heat input max. 19,88 Heat input min. 6,78 Heat output max. 18,0 Heat output min. Efficiency Efficiency at 30% P Exhaust gas temp. (G20 20mbar) amb. - Page 32 TECHNICAL DATA U.M. ISA 20 BITHERMAL DIMENSIONS AND CONNECTIONS Width Height Depth Weight Flow/Return DHW in/out Gas supply Concentric (coaxial) intake/exhaust gas 60-100 pipe diameter Min-max concentric pipe length 0.5-5 + bend Split (separate) intake/flue pipe diameter 80/80 Max pressure drop with separate pipes...
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- Page 36 MADE IN ITALY G20 ENGINEERING A Brand by G20 ENGINEERING SRL Loc. Campogrande 13, 29013 CARPANETO PIACENTINO (PC), Italy phone +39 0523 850513 - fax. +39 0523 850712 - www.aircontrol-pc.com - www.g20engineering.com...
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