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Installation, Use
and Maintenance Manual
for model
SFKA 28 /150 - SFKA 34 /150
SFKA 28 /150 Solar - SFKA 34 /150 Solar
SFKA 28 /150 Plus - SFKA 34 /150 Plus
Condensing water heater
combined with storage tank
0476
SFKA /150_Solar_Plus - RAD - ING - Manual - 2303.1_SKM1.3_MIAH411
SFKA
(also solar option)
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Table of Contents
Related Manuals for Flexiheat SFKA Series
Summary of Contents for Flexiheat SFKA Series
- Page 1 Installation, Use and Maintenance Manual for model SFKA SFKA 28 /150 - SFKA 34 /150 SFKA 28 /150 Solar - SFKA 34 /150 Solar SFKA 28 /150 Plus - SFKA 34 /150 Plus Condensing water heater combined with storage tank (also solar option) 0476 SFKA /150_Solar_Plus - RAD - ING - Manual - 2303.1_SKM1.3_MIAH411...
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Page 2: Table Of Contents
SUMMARY SUMMARY INTRODUCTION 1. INSTALLER SECTION 1.1. INSTALLATION 1.1.1. GENERAL INSTALLATION WARNINGS 1.1.2. WATER HEATER LOCATION ENVIRONMENTAL REQUIREMENTS 1.1.3. REFERENCE LEGISLATION 1.1.4. UNPACKING 1.1.5. MINIMAL TECHNICAL SPACES 1.1.6. OVERALL DIMENSIONS 1.1.7. HYDRAULIC CONNECTIONS SFKA /150 SOLAR PLUS 1.1.8. HYDRAULIC CONNECTIONS SFKA /150 SOLAR 1.1.9. - Page 3 SUMMARY 2.2.10. ACCESSING THE WATER HEATERS 2.2.11. ACCESSING THE P.C.B. 2.2.12. EMPTYING THE D.H.W. SYSTEM 2.2.13. STORAGE TANK MAINTENANCE 2.2.14. GAS CONVERSION 3. USER SECTION 3.1. USE 3.1.1. GENERAL USE WARNINGS 3.1.2. CONTROL PANEL 3.1.3. DISPLAY ICONS 3.1.4. INFO MENU DISPLAY DATA 3.1.5.
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Page 4: Introduction
INTRODUCTION INTRODUCTION WARNING › Device: this term is used referring to the water heater. Before starting any operation it is mandatory to read this instruction manual, in relation to the DANGER activities to be carried out as described in each It identifies an information related to a relevant section. - Page 5 PRODUCT CONFORMITY Flexiheat declares that its gas water heater are professionally manufactured. The materials used such as copper, brass, stainless steel create a homogeneous, compact and functional assembly, easy to install and manage.
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Page 6: Installer Section
1. INSTALLER SECTION 1. INSTALLER SECTION INSTALLER SECTION INSTALLER SECTION The installation operations described in this section, must be performed only by qualified personnel, having the appropriate technical training in the field for the installation and maintenance of components of civil and industrial domestic hot water production and heating plants. -
Page 7: Installation
1. INSTALLATION 1.1. INSTALLATION 1.1.1. GENERAL INSTALLATION › The device is suitable for use with the type of WARNINGS gas available by checking the water heater data plate (placed on the inner side of the front ATTENTION casing). This water heater may be used only for the purpose for which it has been designed: heat water ›... -
Page 8: Reference Legislation
1. INSTALLATION WARNING If the temperature in the appliance installation location goes below -10 centigrades, please fill the plant with anti-freeze liquid and insert and a frost prtotection kit (see chapter ‘ANTI-FREEZE PROTECTION’). WARNING The manufacturer will not be held responsible for damages caused by incorrect installation not in conformity with the above mentioned instructions and not duly protected from... -
Page 9: Unpacking
1. INSTALLATION 1.1.4. UNPACKING WARNING Please unpack the boiler just before installing it. The Company is not responsible for the damages caused to the device due to incorrect storage. WARNING The packing elements (cardboard box, wooden crate, nails, fasteners, plastic bags, expanded polystyrene, etc.) must be kept out of the reach of children as they may be dangerous. -
Page 10: Minimal Technical Spaces
1. INSTALLATION 1.1.5. MINIMAL TECHNICAL SPACES The appliance must be installed exclusively on a flat horizontal solid floor capable of supporting its weight. In order to allow the access inside the water heater for maintenance operations, you have to respect the minimum technical spaces indicated in figure A - 500 mm X - 250 mm... -
Page 11: Overall Dimensions
1. INSTALLATION 1.1.6. OVERALL DIMENSIONS 1.1.8. HYDRAULIC CONNECTIONS SFKA /150 SOLAR 161.5 69.5 69.5 69.5 69.5 SC- CONDENSATE DRAIN Ø 25 mm SVZ- SAFETY DRAIN VALVE Ø 3/4 COLD WATER INLET Ø 3/4 D.H.W. OUTLET Ø 3/4 RS- RETURN FROM SOLAR Ø... -
Page 12: Pump Head / Flow Diagram
1. INSTALLATION 1.1.10. PUMP HEAD / FLOW DIAGRAM THE PUMP IS ONLY FITTED IN VERSIONS WITH RECIRCULATION ZRS 12/6 FLOW RATE (m Appliance head losses THE PUMP IS ONLY FITTED IN VERSIONS WITH SOLAR Wilo-Yonos PARA ST 15/6 p-v (variable) Constant speed I, II, III p/kPa p/kPa... -
Page 13: Hydraulic Connection
1. INSTALLATION 1.1.11. HYDRAULIC CONNECTION The heat exchanger coil cleaning frequency depends on the hardness of the supply water and on DANGER the presence of solid residues or impurities inside Make sure that the water and heating pipes the water that are often present in case of recently are not used as grounding system for the electrical installed plants. -
Page 14: Recirculation Mode (For Sfka 150 And Sfka 150 Solar Plus Models Only)
1. INSTALLATION 1.1.12. RECIRCULATION MODE (FOR SFKA 150 AND SFKA 150 SOLAR PLUS MODELS ONLY) The water heater can manage a recirculation system which is aimed to provide a better well- being for the domestic hot water needs, thus delivering immediately a large amount of hot water. To activate the recirculation mode, please proceed as follows: ›... -
Page 15: Tank Pre-Heating Function ( For Sfka 150 - Sfka 150 Solar Plus Models Only)
1. INSTALLATION 1.1.13. TANK PRE-HEATING FUNCTION ( FOR SFKA 150 - SFKA 150 SOLAR PLUS MODELS ONLY) By activating this function, the water in the storage tank will be heated by the burner, which will always keep the temperature set in the storage tank setpoint (bo) constant. -
Page 16: Filling The Condensate Siphon
1. INSTALLATION 1.1.14. FILLING THE CONDENSATE SIPHON Before starting the water heater, it is necessary to fill the condensate siphon in order to avoid flue reflux of combusted gases through the siphon itself. Fill the condensate siphon as follows (see fig. 1): ›... -
Page 17: Frost Protection
1. INSTALLATION 1.1.15. FROST PROTECTION The water heater is protected against freezing thanks to the P.C.B. configuration with functions that start the burner and heat the concerned parts when their temperature goes below the minimum pre-set values, protecting the water heater up to an external temperature of -10°C. -
Page 18: Gas Connection
1. INSTALLATION 1.1.16. GAS CONNECTION 1.1.17. ELECTRICAL CONNECTION DANGER DANGER In order to connect the water heater gas The water heater is electrically safe only connector to the supply pipe, use a stop seal of an if it is properly connected to an efficient earthing appropriate size and material. -
Page 19: Power Supply
1. INSTALLATION 1.1.18. POWER SUPPLY To power the water heater, connect the electrical cables to the terminal block inside the control panel as follows: DANGER Cut off the voltage from the main switch. › remove the water heater front casing (refer to chapter ACCESSING THE WATER HEATER). -
Page 20: Optional Electrical Connections
1. INSTALLATION 1.1.19. OPTIONAL ELECTRICAL fig. 1 CONNECTIONS The cables should be inserted inside the water heater using the fairleads ‘P1’ and ‘P2’ placed on the hydraulic connections bottom plate (see fig. 1). Make a hole on the fairleads, smaller than the cable diameter, to make sure that the air cannot pass through. - Page 21 1. INSTALLATION To wire the optional items below: (CR) OPEN THERM REMOTE CONTROL (CRC) RECIRCULATION PUMP (SRC) RECIRCULATION SENSOR (KSI) INTEGRATED SOLAR KIT CODE 65-00915 (SIR) REMOTE INLET sensor (SEE SENSOR ENABLING AT PARAMETER P29) operate on the P.C.B. placed inside the control panel as follows: DANGER Cut off the voltage from the main switch.
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Page 22: Fume Exhaust Fittings
1. INSTALLATION 1.1.20. FUME EXHAUST FITTINGS › The discharge duct must be perpendicular with the opposite internal wall of the chimney or of WARNING the fumes exhaust duct (fig. 1). In order to ensure proper operation and efficiency of the device you have to connect the water heater fume exhaust fitting to the fume exhaust duct using appropriate polypropylene flue fittings for condensing water heaters. -
Page 23: Installation Modes
1. INSTALLATION 1.1.21. INSTALLATION MODES For this type of water heater, the following flue exhaust configurations are available: B23P, B33, C13, C33, C43, C53, C63, C83 e C93 (see Fig. 1). › B23P- Indoor air intake and outdoor flue C33 C33 exhaust, with exhaust system operating under pressure. - Page 24 1. INSTALLATION EXHAUST OF COMBUSTION PRODUCTS FOR · permanent openings on the external walls of B-TYPE DEVICES the location; Water heaters, provided with connection for · single or collective, ramified ventilation ducts. flue exhaust pipe, must be directly connected to efficient chimneys or flue exhaust ducts: only if The openings on the external walls of the location these are missing the combustion products can...
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Page 25: Type Of Flue System
1. INSTALLATION 1.1.22. TYPE OF FLUE SYSTEM KIT K - HORIZONTAL CONCENTRIC FLUE KIT Ø60/100 POLYPROPYLENE INNER PIPE ADJUSTABLE AT 360°. It allows the flue exhaust and the air intake from an external wall. Suitable for condensing boilers only. It allows the combustion gas exhaust and the combustion air intake through concentric pipes, the external one for air intake, the internal one for flue exhaust. - Page 26 1. INSTALLATION KIT H – HORIZONTAL TWIN PIPE FLUE KIT Ø80, IN POLYPROPYLENE, ADJUSTABLE AT 360°. The twin pipe system allows the flue exhaust through the flue exhaust pipe and the air intake from outside. Suitable for traditional boilers only. It allows the combustion gas exhaust and the combustion air intake through two separated pipes.
- Page 27 1. INSTALLATION KIT V - VERTICAL CONCENTRIC FLUE KIT Ø60/100 POLYPROPYLENE INNER PIPE. It allows the flue exhaust and the air intake directly the from roof. Suitable for condensing boilers only. It allows the combustion gas exhaust and the combustion air intake through concentric pipes, the external one for air intake, the plastic internal one for flue exhaust.
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Page 28: Service Centre Section
1. 1. SERVICE CENTRE SECTION 2. SERVICE CENTRE SECTION SERVICE CENTRE SECTION SERVICE CENTRE SECTION All operations described below relative to first start- up, maintenance and replacement should be performed only by qualified personnel... -
Page 29: Commissioning
2. COMMISSIONING 2.1. COMMISSIONING 2.1.1. PRELIMINARY OPERATIONS › make sure that t FOR COMMISSIONING or materials near The commissioning operations consist in checking › open the water h the correct installation, setting and operation of that there are n the device. Proceed as follows: the device (the b checked while the ›... -
Page 30: Water Heater Ignition
2. FIRST START-UP 2.1.2. WATER HEATER IGNITION Proceed with water heater ignition as follows: › power the water heater; THE START-UP SYSTEM WILL AUTOMATICALLY ACTIVATE VENT CYCLE FUNCTION, DISPLAYED ON SCREEN WITH CODE “F33” (ONLY AT THE FIRST START-UP IT WILL LAST FOR 5 MINUTES*). -
Page 31: Co2 Value Check And Calibration
2. FIRST START-UP 2.1.3. CO2 VALUE CHECK AND › Access parameter ‘P07’ following the procedure CALIBRATION described chapter “ACCESSING PROGRAMMING THE PARAMETERS” and stay WARNING in edit mode until the calibration is completed The CO value should be checked with (the maximum time before forced exiting the closed casing, while the gas valve should be adjusted edit mode is 7 minutes). -
Page 32: Heat Input Diagram / Electric Fan Frequency
2. FIRST START-UP 2.1.4. HEAT INPUT DIAGRAM / ELECTRIC FAN FREQUENCY 28 kW FREQUENCY (Hz) STARTING STEP GAS TYPE MINIMUM FREQUENCY MAXIMUM FREQUENCY ADJUSTMENT SFKA /150_Solar_Plus - RAD - ING - Manual - 2303.1_SKM1.3_MIAH411... - Page 33 2. FIRST START-UP 34 kW STARTING STEP GAS TYPE MINIMUM FREQUENCY MAXIMUM FREQUENCY ADJUSTMENT SFKA /150_Solar_Plus - RAD - ING - Manual - 2303.1_SKM1.3_MIAH411...
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Page 34: Maintenance
“CO2 VALUE CHECK AND annual basis. The operations described below, are essential CALIBRATION”; to the validity of the standard FLEXIHEAT warranty and must be performed by professionally qualified personnel › periodically check the integrity of the flue in accordance with current legislation system for safety and proper operation;... -
Page 35: Technical Data
2. MAINTENANCE 2.2.6. TECHNICAL DATA Model SFKA 28 /150 SFKA 34 /150 (Solar / Plus) (Solar / Plus) CE certification 0476CQ0134 Gas category II2H3B/P Flue system type type B23-B23p-B33-B53-C13-C33-C43-C53- C63-C73-C83-C93 Heat Input max (D.H.W.) Heat Input min (D.H.W.) 3,70 4,10 Heat Input min LPG 3,70 4,10... - Page 36 2. MAINTENANCE Dimensions Width Depth Height 1530 1530 Gross weight 104,6 kg For SFKA 105,6 kg For SFKA 150 model. 150 model. 107,6 kg For SFKA 108,6 kg For SFKA /150 Solar model. /150 Solar model. 108,6 kg For SFKA 109,6 kg For SFKA /150 Solar Plus /150 Solar Plus...
- Page 37 2. MAINTENANCE Max. Flue length Ø50/50 - Horiz. Twin Max. Flue length Ø60/60 - Horiz. Twin Flue adapter Ø80/60 MF - Pressure loss Flue bend 45° MF Ø60 - Pressure loss Flue bend 90° MF Ø60 - Pressure loss Flue extension MF Ø60 L=1000 - Pressure loss T-connection MF Ø60 - Pressure loss Max Flue length Ø80/80 - Horiz.
- Page 38 2. MAINTENANCE Supply pressure - G31 mbar Supply pressure min. - G31 mbar Supply pressure max. - G31 mbar Fan speed Max. D.H.W. output - G31 Fan speed Min. D.H.W. output - G31 Gas consumption - G31 kg/h 2,17 2,64 SFKA /150_Solar_Plus - RAD - ING - Manual - 2303.1_SKM1.3_MIAH411...
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Page 39: Technical Assembly
2. MAINTENANCE 2.2.7. TECHNICAL ASSEMBLY SFKA /150 CONDENSING HEAT EXCHANGER BURNER FLAME DETECTION ELECTRODE AIR INTAKE PIPE VENTURI CONDENSATE SIPHON EXPANSION VESSEL ANODE STORAGE TANK 10. SAFETY THERMOSTAT 11. D.H.W. OUTLET SENSOR 12. MIXING VALVE - STEPPER 13. 3-WAY VALVE 14. - Page 40 2. MAINTENANCE SFKA /150 SOLAR 1. CONDENSING HEAT EXCHANGER 2. BURNER 3. FLAME DETECTION ELECTRODE 4. AIR INTAKE PIPE 5. VENTURI 6. CONDENSATE SIPHON 7. EXPANSION VESSEL 8. ANODE 9. STORAGE TANK 10. SAFETY THERMOSTAT 11. MANUAL AIR VENT VALVE 12.
- Page 41 2. MAINTENANCE SFKA /150 SOLAR PLUS 1. CONDENSING HEAT EXCHANGER 2. BURNER 3. FLAME DETECTION ELECTRODE 4. AIR INTAKE PIPE 5. VENTURI 6. CONDENSATE SIPHON 7. EXPANSION VESSEL 8. ANODE 9. STORAGE TANK 10. SAFETY THERMOSTAT 11. MANUAL AIR VENT VALVE 12.
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Page 42: Hydraulic Diagram
2. MAINTENANCE 2.2.8. HYDRAULIC DIAGRAM SFKA /150 G. GAS F. COLD WATER INLET C. D.H.W. OUTLET RC. RECIRCULATION INLET FLUE SAFETY THERMO FUSE CONDENSING HEAT EXCHANGER BURNER GAS VALVE CONDENSATE SIPHON HOT WATER SENSOR AT THE OUTLET OF MIXING VALVE NO RETURN VALVE 3-WAY VALVE 10. - Page 43 2. MAINTENANCE SFKA /150 SOLAR G. GAS F. COLD WATER INLET C. D.H.W. OUTLET AS. FLOW TO SOLAR RS. RETURN FROM SOLAR 1. FLUE SAFETY THERMO FUSE 2. CONDENSING HEAT EXCHANGER 3. BURNER 4. MANUAL AIR VENT VALVE 5. FAN 6.
- Page 44 2. MAINTENANCE SFKA /150 SOLAR PLUS G. GAS F. COLD WATER INLET C. D.H.W. OUTLET AS. FLOW TO SOLAR RS. RETURN FROM SOLAR RC. RECIRCULATION INLET 1. FLUE SAFETY THERMO FUSE 2. CONDENSING HEAT EXCHANGER 3. BURNER 4. MANUAL AIR VENT VALVE 5.
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Page 45: Wiring Diagram
2. MAINTENANCE 2.2.9. WIRING DIAGRAM SFKA /150 220 V 50 Hz VM: MIXING VALVE SI: STORAGE TANK OUTLET WATER SENSOR ER: FLAME DETECTION ELECTRODE RO: RED SUM: HOT WATER SENSOR AT THE OUTLET TS: SAFETY THERMOSTAT VD: 3-WAY VALVE CE: BLUE OF MIXING VALVE SA: STORAGE TANK SENSOR TF: FLUE SAFETY THERMO FUSE (102°C) - Page 46 2. MAINTENANCE SFKA /150 Solar 220 V 50 Hz VM: MIXING VALVE MF: FLOWMETER MP: TERMINAL BLOCK GI: YELLOW SUM: HOT WATER SENSOR AT THE OUTLET OF S3: SOLAR COIL SENSOR L: LINE / PHASE BI: WHITE MIXING VALVE EV: FAN S1: SOLAR PANEL SENSOR N: NEUTRAL GR.
- Page 47 2. MAINTENANCE SFKA /150 Solar Plus 220 V 50 Hz VM: MIXING VALVE TS: SAFETY THERMOSTAT EA: START-UP ELECTRODE RO: RED SUM: HOT WATER SENSOR AT THE OUTLET OF TF: FLUE SAFETY THERMO FUSE ER: FLAME DETECTION CE: BLUE MIXING VALVE (102°C) ELECTRODE SA: STORAGE TANK SENSOR...
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Page 48: Accessing The Water Heaters
2. MAINTENANCE 2.2.10. ACCESSING THE WATER HEATERS All maintenance and control operations require the water heater casing panels to be removed. To intervene on water heater casing, please proceed according to the following instructions: › remove the fixing screws placed on the front side of the cover ‘1’... -
Page 49: Accessing The P.c.b
2. MAINTENANCE 2.2.11. ACCESSING THE P.C.B. To proceed to the wirings of the control panel, please do the following: DANGER Cut off the voltage from the main switch. › Grab at the same time the support brackets of the control panel (fig. 1) loosening them and turn the panel downwards;... -
Page 50: Emptying The D.h.w. System
2. MAINTENANCE 2.2.12. EMPTYING THE D.H.W. SYSTEM In case of freezing risk, it is necessary to empty the D.H.W. system as follows: › close the main supply tap of the water supply network; › Joint the water draining pipe and open the storage tank draining tap ‘RB’... -
Page 51: Storage Tank Maintenance
2. MAINTENANCE 2.2.13. STORAGE TANK MAINTENANCE Please have the anode checked on a regular basis. The anode has to be checked at least once every year and, if necessary, it has to be replaced to protect the storage tank. Should the mains water be particularly hard and aggressive, it might be necessary to have it checked two times per year. -
Page 52: Gas Conversion
2. MAINTENANCE 2.2.14. GAS CONVERSION ATTENTION Make sure that the gas supply pipe is suitable for the new type of fuel with which the water heater is supplied. › loosen the two screws ‘1’ (fig.1) from the bushing, and remove the air intake pipe; ›... -
Page 54: User Section
1. 1. USER SECTION 3. USER SECTION USER SECTION USER SECTION The operations described in this section are addressed to all those who will use the water heater. The water heater must be used and accessed only by qualified operators that fully read and understood the User section, paying particular attention to the warnings. -
Page 55: Use
3. USE 3.1. USE 3.1.1. GENERAL USE WARNINGS › DO NOT use electrical switches, the telephone or any other device that might generate electrical WARNING discharges or sparks; Before starting the water heater the User must make sure that the First start-up certificate has ›... -
Page 56: Control Panel
3. USE 3.1.2. CONTROL PANEL RECIRCULATION MODE TEMPERATURE ADJUSTMENT BUTTONS INFO BUTTON: PRESS ONCE TO VIEW THE TEMPERATURES AND OTHER INFORMATION (see chapter ‘INFO MENU DISPLAY’) - HOLD FOR 5 SECONDS, IN OFF OPERATING MODE, TO VIEW THE LAST 5 ERRORS OPERATING MODE SELECTION BUTTON: ON/ RESET BUTTON: ERRORS RESET DOMESTIC... -
Page 57: Display Icons
3. USE 3.1.3. DISPLAY ICONS INDICATION OF PARAMETER NUMBER / DISPLAYED INFO CODE / RECIRCULATION MODE ACTIVE (fig.1) PARAMETERS PROGRAMMING FUNCTION ACTIVE SIGNALLING CONNECTED SOLAR P.C.B. / SOLAR PANEL TEMPERATURE DISPLAY (d5) fig. 1 SOLAR / RECIRCULATION PUMP ACTIVE TANK LOWER TEMPERATURE DISPLAY (d6) / TANK UPPER TEMPERATURE DISPLAY (d7) TEMPERATURE DISPLAY / SET POINT / PARAMETER VALUE... -
Page 58: Info Menu Display Data
3. USE 3.1.4. INFO MENU DISPLAY DATA To view the water heater data from info menu you just have to press the INFO ‘ ’ button. The info code will be displayed on the left side of the screen and its relative value will be displayed on the centre of the screen. -
Page 59: Start-Up
3. USE 3.1.5. START-UP To switch the water heater to OFF operating mode, press the function ‘ ’ button, the symbol ‘ ’ Before starting the water heater make sure that it will appear fixed on the display, indicating that the is powered and that the gas tap placed under the function is activated. -
Page 60: Error Signalling Codes
3. USE 3.1.8. ERROR SIGNALLING CODES The water heater might signal some errors by displaying a code. Below you have a list of the codes and of the operations to be performed in order to unlock the water heater. CODE ICON ERROR INTERVENTION... - Page 61 3. USE CODE ICON ERROR INTERVENTION PARAMETERS PROGRAMMING CUT OFF THE POWER SUPPLY FROM THE MAIN SWITCH AND REQUEST THEN RESTORE IT, AS SOON AS THE ERROR CODE DISAPPEARS, THE WATER HEATER WILL RESTART AUTOMATICALLY. SHOULD THE BLOCK PERSIST, CONTACT THE TECHNICAL SERVICE CENTRE.
- Page 62 3. USE CODE ICON ERROR INTERVENTION TEMPERATURE OUTLET FROM THE CONTACT THE TECHNICAL SERVICE CENTRE. MIXING VALVE TOO HIGH COMPARED TO THE SETPOINT SET BY THE USER SFKA /150_Solar_Plus - RAD - ING - Manual - 2303.1_SKM1.3_MIAH411...
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Page 63: Functions Codes Indication
3. USE 3.1.9. FUNCTIONS CODES 3.1.10. FAST H2O FUNCTION INDICATION The Fast H2O function keeps a constant temperature in the D.H.W. circuit within the water CODE FUNCTION INTERVENTION heater, according to the temperature set by the user. STORAGE TANK WAIT UNTIL A N T I - F R E E Z E OPERATION IS COMPLETED... -
Page 64: Maintenance
3. USE 3.1.11. MAINTENANCE To ensure proper water heater safety and efficiency, please have the water heater serviced annually An accurate maintenance should improve system management. 3.1.12. EXTERNAL CASING CLEANING Clean the water heater casing using a wet cloth and neutral soap. WARNING DO NOT use abrasive or powder detergents as they might damage the water heater casing and... - Page 67 FOR THE AFTER SALE SERVICE PCB Digital instruction manual SCAN THE QR code...