Chaffoteaux & Maury Minima HE System 24 Nat User Manual

4
INTRODUCTION
The MINIMA HE System is a fully automatic, wall mounted, low water content condensing system boiler. It is a
room sealed, fan assisted, appliance providing central heating. It has electronic ignition and is suitable for all
modern electrical control systems. The boiler has been designed for domestic use on sealed systems only. A
circulating pump, expansion vessel together with a pressure gauge and safety valve are included within the boiler.
The standard horizontal flue kit is suitable for lengths 300 mm minimum to 815 mm maximum (see pages 19 & 20)
and includes an elbow adapter that can be rotated through 360
°
. The horizontal flue can extend up to 5 metres
(Ø60/100) and 10 metres (Ø80/125) using 1 metre flue extension kits. 45° and 90° flue bends are also available
as accessories, for more information on the fitting of the flue kits and the suitable flue runs, please refer to Section
12 Connecting the Flue (page 19).
SERVICING INSTRUCTIONS
18 REPLACEMENT OF PARTS .........................................................................................................................46
18.1 To Gain General Access........................................................................................................................46
18.1.1 Removing the front panel.......................................................................................................................46
18.1.2 Lowering the control panel.....................................................................................................................46
18.2 Access to the Combustion Chamber .....................................................................................................47
18.2.1 Removing the air/gas assembly.............................................................................................................47
1
8.2.2
R
emoving the burner .............................................................................................................................48
18.2.3 Removing the detection electrode .........................................................................................................48
1
8.2.4
R
emoving the ignition electrode.............................................................................................................48
18.2.5 Removing the fan...................................................................................................................................49
1
8.2.6
R
emoving the gas valve.........................................................................................................................49
18.2.7 Removing the heat exchanger ...............................................................................................................50
18.2.8 Removing the spark generator...............................................................................................................50
18.3 Access to the Water Circuit ...................................................................................................................51
18.3.1 Drain down.............................................................................................................................................51
18.3.2 Removing the Central Heating Return Body..........................................................................................51
18.3.3 Removing the pump...............................................................................................................................52
18.3.4 Removing the pressure relief valve ......................................................................................................52
18.3.5 Removing the domestic expansion vessel.............................................................................................53
18.3.6 Removing the overheat thermostat........................................................................................................53
18.3.7 Removing the temperature sensors (NTC’s) .........................................................................................53
18.3.8 Removing the pressure gauge...............................................................................................................54
18.3.9 Removing the low water pressure switch ..............................................................................................54
18.4 Access to the Control System................................................................................................................54
18.4.1 Removing the PCB’s..............................................................................................................................54
18.4.2 Removing the fuses ...............................................................................................................................55
18.5 Connecting the External Sensor ............................................................................................................55
19 ERROR CODES ....................................................................................................................................56
20 INCORRECT OPERATION ..................................................................................................................57
21 MAINTENANCE INSTRUCTIONS.........................................................................................................58
21.1 General Remarks...................................................................................................................................58
21.2 Cleaning the Primary Heat Exchanger ..................................................................................................58
21.3 Operational Test ....................................................................................................................................
58
22 SHORT SPARES LIST ..........................................................................................................................59
23 TECHNICAL DATA ................................................................................................................................60
24 BENCHMARK COMMISSIONING CHECKLIST...................................................................................61
25 SERVICE INTERVAL RECORD ............................................................................................................62
TERMS AND CONDITIONS OF GUARANTEE
.....................................................................................64

Chaffoteaux & Maury Minima HE System 24 Nat Specifications

General

Brand	Chaffoteaux & Maury
Model	Minima HE System 24 Nat
Category	Boiler
Language	English