Biasi Riva Plus HE M296.24SR/C - User Manual

Wall hung, fanflue, roomsealed, high efficiency gas boiler
Service manual
Riva Plus HE
Models G.C. Appl. No.
M296.24SR/C 41-583-18 SYSTEM BOILER
M296.28SR/C 41-583-19 SYSTEM BOILER
Leave this manual adjacent to the gas meter
Warning:
Service / repairs must be carried out, only by a qualified Gas Safety
Registered Engineer, who will be responsible for the current Regulations for
gas appliances.
Note:
After servicing, complete the relevant Service Interval Record section of the
Benchmark Checklist of the user and installation manual.

Summary

Service Manual

Overall Information

Overall View

Provides a visual overview of the boiler components.

Hydraulic Diagram

Illustrates the central heating (c.h.) operation of the boiler.

General Access and Emptying Hydraulic Circuits

Nomenclature

Lists and identifies various parts of the boiler casing.

Body Panels

Details the removal of the boiler's main body panels for access.

Control Panel

Explains how to access and manipulate the control panel for service.

Access to the Sealed Chamber

Emptying the Primary Circuit

Diagrams

Wiring Diagram

Presents the electrical wiring schematic of the boiler system.

Circuit Voltages

Fault Finding

Components to Check

Lists boiler components to inspect for troubleshooting specific defects.

Defect Description

Details common boiler defects and their symptoms.

Primary Heat Exchanger

Function

Explains the role of the primary heat exchanger in heat transfer.

Removal

Provides step-by-step instructions for removing the primary heat exchanger.

Cleaning

Guides on how to clean the primary heat exchanger.

Condensing Heat Exchanger

Function

Describes the function of the condensing heat exchanger in heat recovery.

Removal

Outlines the procedure for removing the condensing heat exchanger.

Cleaning

Details the process for cleaning the condensing heat exchanger.

Pump

Function

Explains the pump's role in circulating water through the heating system.

Checks

Details checks for pump operation and electrical continuity.

Pump Removal

Provides instructions for removing the pump unit.

Removal of Electrical Capacitor

Electronic Control;Ignition P.C.B.

Function

Explains the primary role of the PCB in controlling boiler operations.

Selection and Adjustment Devices

Identifies accessible selection and adjustment devices on the PCB.

Checking the Temperature

Operation Lights

Setting Boiler Control Function Modes

Useful Output Setting

C.H. Only Mode Setting

Reignition Frequency Setting

Ignition Gas Pressure Adjustment

Checks

Removal of the Electronic Control p.c.b.

Thermal Control in the Mode

Ignition and Control Sequence

Modulating Gas Valve

Function

Explains how the modulating gas valve controls gas flow to the burner.

Nomenclature of the Parts

Identifies the different parts of the modulating gas valve.

Adjustment

Details the procedure for adjusting gas pressure at the valve.

Checks

Removal of On-Off Operators Coils

Removal of the Gas Valve

Primary Circuit Flow Switch

Function

Explains the function of the flow switch in checking water presence.

Checks

Details electrical checks for the primary circuit flow switch.

Removal

Provides instructions for removing the primary circuit flow switch.

Expansion Vessel and Temperature-Pressure Gauge

Function

Describes the role of the expansion vessel in managing water volume changes.

Checks

Outlines checks for the expansion vessel's pre-load pressure.

Removal of Expansion Vessel

Guides on how to remove the expansion vessel.

Removal of Temperature-Pressure Gauge

Details the process for removing the temperature-pressure gauge.

Temperature Probe

Function

Explains how the temperature probe converts water temp to an electrical signal.

Checks

Details how to check the sensor operation and electrical resistance.

Removal of c.h. Temperature Probe

Provides steps for removing the central heating temperature probe.

By-Pass Valve

Function

Explains the by-pass valve's role in guaranteeing minimum flow.

Removal

Guides on how to remove the by-pass valve.

Fan and Air Pressure Sensor

Function

Describes the fan's role and its control by the air pressure sensor.

Checks

Details checks for the fan motor resistance and sensor operation.

Removal of the Fan

Removal of the Air Pressure Sensor

Ignition and Detection Electrodes

Function

Explains the role of ignition and detection electrodes in the burner sequence.

Checks

Details checks for electrode position, distance, and connections.

Removal

Provides steps for removing the ignition and detection electrodes.

Safety Thermostat

Function

Explains the safety thermostat's function to prevent overheating.

Checks

Details checks for overheat temperature value and electrical function.

Removal

Guides on how to remove the safety thermostat.

Flue Temperature Probe NTC

Function

Describes the probe's role in sensing flue gas temperature.

Checks

Details checks for overheat temperature value and resistance.

Removal

Provides steps for removing the flue temperature probe.

Condensate Trap

Function

Explains the function of the condensate trap in managing condensation.

Removal

Guides on how to remove the condensate trap.

Short Spare Parts List

Biasi Riva Plus HE M296.24SR/C Specifications