C&M 24 - User Manual

MAINTENANCE AND
SERVICE GUIDE
Fanned Flue Condensing Central
Heating System Boiler 24 and 30
Dimensions
Flue types:
C 13: C 33: C 53:
c
108 108
JLN
I
88
J
L
N
2
32
235
32
380
212
3
60
50
67
850
737
Safety valve
center line
All dimensions in mm
Outer case dimensions :
-
Width : 440 (minimum space required 450)
-
Height : 850
- Depth : 380 (24kW) - 405 (30 kW)
212
360
67
737
850
50
I Safety valve outlet
J Heating flow
L Gas supply
N Heating return
Technical Data
Heat gross input C/H maxi ............................ 9.2-27.8 kW 10.4-31.6 kW
Heat output C/H 50°/30° maxi....................... 9-26 kW 10-30kW
Heat output C/H 80°/60° maxi....................... 8-24 kW 9-28 kW
C/H operating temperature............................
80
°C max 80°C max
C/H circuit pressures Min operating ..............
0.7 bar
0.7 bar
C/H circuit pressures Max operating ............. 2.5 bar 2.5 barr
Safety discharge
...........................................
3 bar 3 bar
Expansion vessel - Pre-charge pressure ...... 0,7 bar 0.7 bar
Net capacity at 3 bar in liter........................... 5.44 5,44
Supply ........................................................... 230 v 230 v
Consumption ................................................. 150 w 150 w
Protection ...................................................... IP 44 IP 44
Fuse F1/F2/F3/F4
......................................... 2 A/1.25 A/0.315 A/0.250 A
External controls
...........................................
24 v
24 v
Natural gas G20
Gas rate C/H max ................... 2.64 m
3
/h 3.01 m
3
/h
Gas rate C/H mini.................... 0.87 m
3
/h 1 m
3
/h
Gas valve restrictor diameter
..
without without
Propane L.P.G G31
Gas rate C/H max. .................. 1.94 kg/h 2.21 kg/h
Gas rate C/H mini
.................... 0.64 kg/h
0.73 kg/h
Gas valve restrictor diameter .. 4.40 mm 4.80 mm
24 kW
30 kW
24 kW
30 kW
24 : 380
30 : 405

Summary

Technical Specifications

Internal Components Identification

Control Panel and Boiler Operation

Central Heating Operation Details

Central Heating Mode Activation

Details on initiating heating, flow rate, ignition sequence, and flame detection.

Boiler Lockout Procedure

Steps to follow when the boiler enters a lockout state due to flame loss.

Overheat Detection and Reset

Describes the boiler's response to overheating and the reset procedure.

Electrical Wiring Diagrams

Electrical Connection Schematics

Illustrates the electrical connections for the room thermostat, gas valve, and fan.

Boiler Configuration and Settings

Configuration Menu 4: Boiler Settings

Combustion Rate Control Modes

Configuration Menu 5: Combustion Rate Control

Central Heating Output Adjustment

Accessing Installer Mode

Adjusting Central Heating Output

Step-by-step guide to adjust the central heating heat output.

Routine Servicing and Maintenance

Routine Servicing Schedule

Outlines recommended checks and operations for regular boiler maintenance.

Suggested Servicing Sequence

Provides a recommended order for performing servicing tasks.

Preliminary Servicing Checks

Parts Removal and Replacement Procedures

Outer Case Removal Procedure

Sealed Chamber Front Panel Removal

Burner Assembly Removal

Gas Valve Assembly Removal

Fan Assembly Removal

Detailed Component Removal

Main Heat Exchanger Removal

Circulation Pump Removal

Pressure Relief Valve Servicing

Main Control Board Replacement

Expansion Vessel Replacement

Pressure Gauge Replacement

Fault Finding Chart Part 1

Initial Checks and LED Status

Steps for basic checks and interpreting LED status lights.

Error Code Reference

Lists common error codes and their descriptions for diagnosis.

Pump and Fan Troubleshooting Steps

Diagnosing issues related to the pump and fan operation.

Spark Generation and Voltage Checks

Procedures for checking spark generation and transformer voltage.

Fault Finding Chart Part 2

Flame Detection and Gas Solenoid Checks

Troubleshooting flame detection and gas solenoid energization.

Combustion Chamber and Airflow Diagnosis

Diagnosing problems related to combustion chamber condition and airflow.

Ionisation Probe and Control Board Diagnosis

Steps for checking the ionisation probe and control board failures.

Final Boiler Status Assessment

Spare Parts List

Key Components Identification

C&M 24 Specifications

General

Brand	C&M
Model	24
Category	Boiler
Language	English