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Ariston microGENUS II 31 MFFI User Manual

Ariston microGENUS II 31 MFFI
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microGENUS II 24 MFFI
microGENUS II 28 MFFI
microGENUS II 31 MFFI
Installation and Servicing
Instructions
Type C Boilers
G.C.N: 47-116-25 (24kW)
G.C.N: 47-116-26 (28kW)
G.C.N: 47-116-27 (31kW)
LEAVE THESE INSTRUCTIONS WITH
THE END-USER
Country of destination: GB, IE
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Ariston microGENUS II 31 MFFI Specifications

General IconGeneral
MountingWall-mounted
Fuel TypeNatural Gas / LPG
Output31 kW
Central Heating Output31 kW
DHW Output31 kW
Efficiency93 %
Max operating pressure3 bar
IgnitionElectronic
NOx emissionsClass 5

Summary

1. GENERAL INFORMATION

1.1 GENERAL INSTRUCTIONS

Read instructions carefully for proper installation, use, and maintenance.

1.2 OVERALL VIEW

Provides a visual overview of the appliance components and their layout.

2. INSTALLATION

2.1 REFERENCE STANDARDS

Details relevant safety and installation standards for GB and IE.

2.2 SITING THE APPLIANCE

Guidelines for selecting the appropriate location for the boiler.

2.3 OVERALL DIMENSIONS

Specifies the physical dimensions and connection points of the appliance.

2.4 CLEARANCES

Defines the minimum safe clearances required around the appliance.

2.5 MOUNTING THE APPLIANCE

Instructions for the correct procedure to mount the boiler on the wall.

2.6 ELECTRICAL CONNECTION

Details on safely connecting the boiler to the electrical supply.

2.7 GAS CONNECTION

Instructions for connecting the gas supply pipework to the boiler.

2.8 WATER CONNECTIONS

Guidance on connecting central heating and domestic hot water circuits.

2.9 FLUE CONNECTIONS

Information on routing, terminating, and ensuring the integrity of the flue system.

2.10 CONTROL PANEL

Explains the function of each button and indicator on the control panel.

2.11 DIGITAL DISPLAY AND FAULT CODES

Details the boiler's display and lists common fault codes and their causes.

2.12 REMOVING THE FRONT PANEL

Procedure to remove the front casing panel for internal access.

2.13 ROOM THERMOSTAT CONNECTION

Instructions for connecting external thermostats or programmers.

2.14 ELECTRICAL/SYSTEM DIAGRAMS

Provides wiring schematics and component identification for the system.

2.15 WATER CIRCUIT DIAGRAM

Illustrates the internal water flow and component layout.

3. COMMISSIONING

3.1 INITIAL PREPARATION

Checks and preparations required before initial boiler start-up.

3.2 INITIAL START-UP

Procedure for turning on the boiler and initial operational checks.

3.3 OPERATIONAL ADJUSTMENTS

Details on setting and adjusting boiler parameters for optimal performance.

3.4 COMBUSTION ANALYSIS

Procedure for analysing combustion by-products and settings.

3.5 PRODUCT OF COMBUSTION DISCHARGE MONITORING

Monitoring flue exhaust and air intake pressure for proper operation.

3.6 BOILER SAFETY SYSTEMS

Explains the boiler's safety shutdown mechanisms and indicators.

3.7 DRAINING THE SYSTEM

Instructions for safely draining the heating and domestic hot water systems.

3.8 COMPLETION

Notes on completing required documentation for commissioning.

3.9 OPERATIONAL CHECKS

Final checks to ensure correct operation after commissioning.

3.10 INSTRUCTING THE END USER

Guidance for installers on how to instruct end users on boiler operation.

4. GAS ADJUSTMENTS

4.1 CHANGING THE TYPE OF GAS

Procedure for converting the boiler between natural gas and LPG.

4.2 ADJUSTING THE GAS PRESSURES

Steps to set the minimum and maximum gas pressures for boiler operation.

5. MAINTENANCE

Recommended Annual Inspections

Lists essential annual checks for safety, performance, and component integrity.

6. SERVICING INSTRUCTIONS

6.1 REPLACEMENT OF PARTS

Guidance on identifying and replacing faulty components.

6.2 GAINING GENERAL ACCESS

Steps to access internal components, including removing panels.

6.3 ACCESS TO THE COMBUSTION CHAMBER

Procedure for accessing and removing components within the combustion chamber.

6.3.1 REMOVING THE COMBUSTION COVER

Steps to remove the combustion chamber cover.

6.3.2 REMOVING THE BURNER AND JETS

Instructions for removing the burner and its jets.

6.3.3 REMOVING THE ELECTRODES

Procedure for safely removing ignition and detection electrodes.

6.3.4 REMOVING THE MAIN HEAT EXCHANGER

Detailed steps for removing the main heat exchanger.

6.3.5 REMOVING THE AIR PRESSURE SWITCH

Procedure for disconnecting and removing the air pressure switch.

6.3.6 REMOVING THE FAN

Instructions for disconnecting and removing the fan assembly.

6.4 ACCESS TO THE GAS VALVE

Procedures for accessing and removing the gas valve components.

6.4.1 REMOVING THE SPARK GENERATOR

Steps to remove the spark generator from the gas valve.

6.4.2 REMOVING THE GAS VALVE (HONEYWELL)

Detailed instructions for removing the Honeywell gas valve.

6.5 ACCESS TO THE WATER CIRCUIT

Procedures for accessing and removing components in the water circuit.

6.5.1 REMOVING THE D.H.W. (SECONDARY) EXCHANGER

Steps for removing the domestic hot water secondary heat exchanger.

6.5.2 REMOVING THE PUMP PRESSURE SWITCH

Procedure for removing the pump pressure switch.

6.5.3 REMOVING THE SAFETY VALVE

Instructions for removing the safety valve.

6.5.4 REMOVING THE AUTOMATIC AIR VENT

Procedure for removing the automatic air vent.

6.5.5 REMOVING THE PUMP

Steps for disconnecting and removing the circulation pump.

6.5.6 REMOVING THE PRESSURE GAUGE

Procedure for removing the pressure gauge.

6.5.7 REMOVING THE EXPANSION VESSEL

Steps for removing the expansion vessel.

6.5.8 REMOVING THE OVERHEAT THERMOSTAT

Procedure for removing the overheat thermostat.

6.5.9 REMOVING THE C.H. TEMPERATURE PROBE (N.T.C.)

Instructions for removing the central heating temperature probe.

6.5.10 REMOVING THE D.H.W. TEMPERATURE SENSOR (N.T.C.)

Procedure for removing the domestic hot water temperature sensor.

6.5.11 REMOVING THE DIVERTER VALVE ACTUATOR

Steps for removing the diverter valve actuator.

6.5.12 REMOVING THE D.H.W. FLOW SWITCH

Procedure for removing the domestic hot water flow switch.

6.6 ACCESS TO THE CONTROL SYSTEM

Procedures for accessing and checking components within the control system.

6.6.1 CHECKING THE FUSES

Instructions for locating and checking the boiler fuses.

6.6.2 REMOVING THE P.C.B.

Steps for safely removing the main and display printed circuit boards.

6.6.3 REMOVING THE TIME CLOCK

Procedure for removing the time clock component.

7. FAULT FINDING

7.1 FAULT FINDING GUIDE (FLOW-CHARTS)

Diagnostic flow charts to identify and resolve common boiler faults.

8. EXPLODED VIEW

8.1 SHORT SPARES LIST

A list of common spare parts with their key numbers and part numbers.

9. TECHNICAL INFORMATION

TECHNICAL SPECIFICATIONS

Detailed technical specifications for the boiler models including performance and dimensions.

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