Chaffoteaux & Maury MX2 24 FF User Manual

Supplied By www.heating spares.co Tel. 0161 620 6677
Fanned Flue Combination Boiler
Heating and Instantaneous Domestic Hot Water
MAINTENANCE AND
SERVICE GUIDE
Dimensions
Technical data
Heat input C/H & DHW MX2 24 : 12 to 26,1 kW
Gross MX2 30 : 12 to 32,25 kW
Heat output C/H & DHW MX2 24 : 10 to 24 kW
Gross MX2 30 : 10 to 30kW
Max. operating pressure C/H circuit : 3 bar
Expansion vessel net capacity : 6 l (24kW) 8 l (30 kW)
Expansion vessel initial pressure : 0.7 bar(24kW) 1bar (30kW)
Electrical consumption : 150 w Max
Voltage : 230 v
Electrical protection index : IP44
Fuses : 2 A , 1.25 A and 0.315 A
DHW flow rate at 30°C MX2 24 : 11,4 l/min
MX2 30 : 14,3 l/min
DHW flow rate at 35°C MX2 24 : 9,85 l/min
MX2 30 : 12,25 l/min
Minimum DHW operating flow rate : 2 l/min
Minimum DHW working pressure : 0.1 bar
Maximum DHW working pressure : 10 bar
Gas category : II 2H 3+
Nominal gas flow rate at 15°C and 1013 mbar MX2 24 MX2 30
Maximum Minimum Maximum Minimum
power 24 kW power 10 kW power 30 kW power 10 kW
- Natural gas ( G 20) at 20 mbar 2.76 m
3
/h 1.27 m
3
/h 3.41 m
3
/h 1.27 m
3
/h
- Butane gas ( G 30) at 28 mbar 2.06 kg/h 0.94 kg/h 2.50 kg/h 0.94 kg/h
- Propane gas ( G 31) at 37 mbar 2.02 kg/h 0.93 kg/h 2.47 kg/h 0.93 kg/h
Injectors and gas valves seat diameter MX2 24 MX2 30
Natural gas Butane or Propane Natural gas Butane or Propane
- Manifold injectors (11 for 24 kW) 1.35 mm 0.80 mm 1,30 mm 0,80 mm
(14 for 30 kW)
I Safety valve outlet
J Heating flow
K D.H.W. flow
L Gas supply
M Cold water inlet
N Heating return
The boiler is suitable for the flue types:
• type C 12
• type C 32
• type C 52
Outer case dimensions :
- Height : 720
- Width : 390 (minimum space required 400)
- Depth : 296
c
All dimensions in mm
Fig. 1
These Instructions Must Be Left With The Appliance.

Chaffoteaux & Maury MX2 24 FF Specifications

General

Mounting	Wall-mounted
Output	24 kW
Fuel Type	Natural Gas
Efficiency	93%
Weight	31 kg
Max Working Pressure	3 bar
Ignition	Electronic
Flue System	Room-sealed
Warranty	2 years
Condensing	No
Type	Combi

Summary

Boiler Dimensions and Technical Data

Dimensions Overview

Specifies the external measurements of the boiler unit and flue types.

Technical Specifications

Lists key operational parameters including heat input, flow rates, and pressures.

System Characteristics and Components

Pump and Expansion Vessel Performance

Details pump head availability and system capacity charts.

Component Location Guide

Identifies and labels various components within the boiler system.

Boiler Operation and Controls

Boiler Switching On Procedure

Step-by-step guide for safely powering on the boiler.

Hot Water Operation

Instructions for utilizing the boiler for domestic hot water.

Control Panel and Functional Diagrams

Overview of the control panel and schematic diagrams for operation.

Operational Modes and Wiring

Domestic Hot Water Mode

Procedure for operating the boiler exclusively for hot water.

Central Heating Mode

Procedure for operating the boiler for central heating.

Wiring Diagram

Illustrates the electrical connections and layout of the boiler.

Adjustments and Regulation

Control PCB Adjustments

Details on potentiometers P1 and P2 for CH and lighting power.

Temperature Regulation

How thermistors control C/H and DHW temperatures.

Servicing and Testing Procedures

Routine Servicing Schedule

Recommends annual servicing by competent persons.

Combustion Testing Parameters

Lists NOx and CO values for performance testing.

Boiler Cleaning Guidelines

Instructions for safe and effective boiler cleaning.

Component Removal and Replacement

Outer Case and Combustion Chamber

Steps for removing the outer casing and combustion chamber panel.

Gas Valve and Fan Assembly

Procedures for removing the gas valve and fan unit.

DHW Flow Switch and Pressure Switch

Instructions for accessing and removing the DHW flow switch and pressure switch.

Key Component Replacement

Main Heat Exchanger and Pump

Guide for removing and replacing the main heat exchanger and pump.

Pressure Relief Valve and Thermostats

Steps for replacing the pressure relief valve and thermostats.

Control Board and Expansion Vessel

Instructions for replacing the control board and expansion vessel.

Fault Finding Chart

Initial Fault Diagnosis

Flowchart for preliminary checks and identifying power or basic faults.

Pump and Fan Operational Checks

Diagnostic steps for pump and fan operation issues.

Air Pressure and Ignition Faults

Troubleshooting for air pressure switch, spark generation, and burner faults.

Safety Shutdown and Specific Faults

Diagnosing safety shutdown triggers and specific operating faults.

Incorrect Function Codes

LED Fault Indicators

Table correlating LED patterns with specific faults and information.

Component Short List

Parts Identification and Codes

List of components with key numbers, descriptions, and part numbers.