DeDietrich MCR 24, MCR 24/28 MI, MCR 30/35 MI, MCR 34/39 MI Technical Instructions

MCR 24, 24/28 MI, 30/35 MI, 34/39 MI

Wall-hung gas condensation boilers

English

08/06/06

Technical

instructions

Contents

Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Symbols used. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Important recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

1 Package list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

2 Certifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

3 Main parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

4 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Main dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

1 Package list (Standard delivery). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

2 Serial number. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

3 Mounting frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

4 Boiler installed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

1 Control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

2 Parameter display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Hydraulic specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

1 Boiler pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

2 Expansion chamber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

1 Water treatment and connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

2 Connecting the options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

3 Connecting the external controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

4 Connection of the domestic hot water sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

5 Antifreeze protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

6 Safety contact. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

7 Connection of a remote alarm transfer and boiler operation indication system (Not proposed) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

8 Pump logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

Commissionning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

1 Commissionning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

2 Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

Adapting to another gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44

1 Switching from Natural Gas to Propane. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44

2 Setting the control unit parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46

1 Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46

2 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49

Electrical diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

Breakdown codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

Spare parts - MCR 24, 24/28 MI, 30/35 MI, 34/39 MI. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60

MCR 24, 24/28 MI, 30/35 MI, 34/39 MI 08/06/06-300008460-001-B

Declaration of compliance

1

Declaration of compliance A.R. 8/1/2004 - BE

Manufacturer DE DIETRICH THERMIQUE S.A.S.

57 rue de la Gare

F - 67580 MERTZWILLER

[phone]

*

[phone]

+

Issued by See end of notice

We hereby certify that the series of appliances specified hereinafter is in compliance with the standard model described in the EC declaration
of compliance, and that it is manufactured and marketed in compliance with the requirements and standards of the following European
Directives:

Product type Wall-hung gas boilers
Formats MCR 24

MCR 24/28 MI
MCR 30/35 MI
MCR 34/39 MI

Standard applied - 90/396/EEC Gas Appliance Directive

Reference Standards : EN 437; EN 483; EN 625; EN 677

- 73/23/EEC Low Voltage Directive
Reference Standards : EN 60.335.1

- 89/336/EEC Electromagnetic Compatibility Directive
Generic standards : EN1000-6-3 ; EN 61000-6-1

- 92/42/EEC Efficiency Directive ****
Inspecting organisation Gastec (Netherland)
Values: Standards EN 297 A3 NOx < 114 (mg/kWh) 65 ppm; CO < 65 (mg/kWh) 65 ppm
Date 22/06/04

Signature Technical Director

Mr Bertrand SCHAFF

1

08/06/06 - 300008460-001-B MCR 24, 24/28 MI, 30/35 MI, 34/39 MI

3

Symbols used

Caution danger



Risk of injury and damage to equipment. Attention must be
paid to the warnings on safety of persons and equipment

Important information



Information must be kept in mind to maintain comfort

Important recommendations

MCR boilers must be installed :

- in a frost-free room;

- as close as possible to draw-off points in order to minimise energy
losses through the pipes.

Installation must be carried out in accordance with the prevailing
regulations, the codes of practice and the recommendations in these
instructions.

Keep this document close to the place where the tank is



installed.

The first start-up is to be performed by your installation engineer.
Only original spare parts must be used.
Any intervention on the appliance and heating equipment must be

carried out by a qualified technician. Please confirm to the user of the
installation that you have carried out a leak tightness check on the
gas circuit.

For the application of article 25 of the modified decree dated 02/08/
1977 and of article 1 of the modifed decree dated 05/02/1999, the
installation engineer must be in possession of the certificates of
compliance approved by the Ministries in charge of construction and
gas safety.

Any work on the gas valve unit is authorised only if carried out



by a qualified professional.

Reference

Z

Refer to another manual or other pages in this instruction
manual

DHW:Domestic hot water

The manufacturer is not liable for any improper use of the



appliance or failure to maintain or install the unit correctly
(the user shall take care to ensure that the system is
installed by a qualified fitter).

Work on electrical equipment must be carried out by a qualified
professional in compliance with the prevailing legislation.

We shall not accept any responsibility for any damage and



disturbance arising from not following these instructions.

Service the appliance regularly to ensure that it operates



correctly.

Belgium

The installation and maintenance of the boiler must be done by a
qualified professional in compliance with the prevailing local and
national regulations.

The boiler is preset in the factory to operate on natural gas.



It is formally prohibited to interfere with the gas block.

Other countries

The installation and maintenance of the boiler must be done by a
qualified professional in compliance with the prevailing local and
national regulations.

For Belgium: The operations required to switch from one gas



to another must be carried out by a SERV'elite technician.

Prior to commissioning, compare the factory settings of the appliance
with the local power supply conditions. If the settings have to be
modified, this must be carried out by a qualified professional.

Condensation boilers require a flue gas evacuation system or a fresh
air inlet specially adapted to the method of operation. Its execution
depends on the place of installation and the building.

Compliance with a minimum distance between the flue gas
evacuation system in forced flue mode or the boiler with combustible
substances is not necessary (For Belgium: Comply with the NBN
B61-002 standard). At nominal output, the temperature of the
components does not exceed 85 °C.

4

MCR 24, 24/28 MI, 30/35 MI, 34/39 MI 08/06/06-300008460-001-B

Description

MCR boilers are gas condensing boilers; they handle :

- central heating using radiators or underfloor heating
(MCR 24);

- central heating and instant domestic hot water production
(MCR ... MI).

The boilers operate on natural gas or propane. They are factory set
for natural gas H.

If converting to propane :

See "Adapting to another gas"

Z

The MCR 24 boiler can be connected to a 80 or 130 litre tank to
produce domestic hot water.

For Belgium: Any intervention on the gas valve unit is



strictly forbidden.

For use with natural gas L or propane, it is necessary to adjust the
boiler.

Boilers MCR 24 MCR 24/28 MI MCR 30/35 MI MCR 34/39 MI*

No. CE PIN 0063BQ3009

B

Type

Flue gas evacuation Forced flue

Ignition Automatic

Gas Natural gas / Propane

23P

, B33, C

13(x)

, C

33(x)

, C

43(x)

, C53, C

63(x)**

, C

83(x)

* Italy: Not proposed ** Except Belgium

1 Package list

- Boiler package with mounting frame. Can be used to make the
water, gas and water evacuation connections: Safety valve,

- Accessories package, dependent on the type and length of the
forced flue

disconnector, condensates run-off.

2 Certifications

User country FR ES, GB, GR, IE, IT, PT BE PL

Category

Gas

Supply pressure

User country CZ HU RO, SI

Category

Gas

Supply pressure

II

2Esi3P

GN H Propane GN H Propane G20/25 E (G20) Ls

GN L G31 Lw G31

20 mbar 37 mbar 20 mbar 29 mbar 20/25 mbar 20 mbar 13 mbar

25 mbar 37 mbar 20 mbar 36 mbar

II

2H3P

GN H Propane GN H Propane G20

20 mbar 50/29 mbar 25 mbar 28-30/50 mbar 20 mbar

30/37/50 mbar 30 mbar

II

2H3P

II

2H3P

I

2E(S)B

, I

3P

II

2ELwLs3P

II

G31

2H3P

08/06/06 - 300008460-001-B MCR 24, 24/28 MI, 30/35 MI, 34/39 MI

5

3Main parts

Automatic bleed valve

1.

Smoke nozzle

2.

Outlet for measuring combustion hygiene

3.

Heat exchanger

4.

Air/gaz canal

5.

Fan air inlet

6.

Gas block

7.

Display

8.

Control panel

9.

Pressure gauge

10.

Circulating pump

11.

Expansion chamber (only for MCR 24,MCR24/28 MI,MCR 30/35 MI)

12.

Ignition/ionisation electrode

13.

Stand off mounting frame (optional)

14.

Expansion chamber (optional): only for MCR 34/39 MI



6

MCR 24, 24/28 MI, 30/35 MI, 34/39 MI 08/06/06-300008460-001-B

4 Technical data

Boilers MCR 24 MCR 24/28MI MCR 30/35MI MCR 34/39MI

Nominal useful output 40/30 (Heating mode) (min./max) kW 6.3/25 6.3/25 6.6/31.3 6.8/35.5
Nominal useful output 80/60 (min./max) kW 5.5/23.6 5.5/23.6 5.7/29.5 5.9/33.3
Nominal useful output (DHW mode) (min./ max) kW - 27.4 34.3 38.2
Nominal input power (heatin g an d DH W modes) kW 24/24 24/28 30/35 34/39
Minimum useful output 40/30 (Heating mode) kW 6.3 6.3 6.6 6.8
Minimum input power (heating and DHW modes) kW 5.8 5.8 6.1 6.3

Gas flow rate à Pn (à 15°C - 1013 mbar):
Natural gas H
Natural gas L
Propane

PCI efficiency, Load and water temperature efficiency:
100% Nominal power, Average temperature: 70°C
100% Nominal power, Return temperature: 30°C
30% Nominal power, Return temperature: 30°C

Maximum temperature (Safety thermostat cut-off) °C 110 110 110 110
Losses when off (∆T = 30 °C) W30302928
Losses through the outer casing % 1.1 1.1 0.9 0.5
Water capacity l 1.7 1.8 2 2.2
Weight without water, without mounting frame, without cladding kg 29 30.5 32 31.5

kW

3

m

3

m
Kg/h

%
%
%

/h

/h

24

2.4

2.8

1.9

98.3

104.4

108.7

Specifications of the heating circuit

Nominal water flow (∆T = 20 K) l/h 1.03 1.03 1.29 1.47
Rated net head (∆T = 20 K) mbar >200 >200 >200 >200
Flow temperature °C 75 75 75 75
Maximum pressure bar3333
Expansion chamber l8 8 8 -
Initial pressure of the expansion tank bar1111
Minimum operating pressure bar 0.8 0.8 0.8 0.8

Domestic hot water specifications

Instruction set outlet temperature °C 55 55 55 55
Specific hot water flow (∆T = 30 K) l/min - 14 16 19
Nominal max cold water pressure bar8888
Minimum pressure (11 l/min) bar - 1.4 0.4 0.4

Combustion products circuit

Connecting
Mass flue gas flow rate (min./max) Kg/h 10/40 10/47 10/59 10/62

Flue gas temperature 80/60 °C 78 78 74 71.5
Pressure available at the flue gas nozzle Pa 50 100 100 140
Condensation water pH 50/30 - 1-7 1-7 1-7 1-7

diameter

(mm)

60/100 60/100 60/100 60/100

Electrical specifications

Power supply voltage (50 Hz) V 230 230 230 230
Power consumption W 115 115 150 180
Electrical output circulating pump W 90 90 125 135
Auxiliary electrical output (Nominal power, ex circulating pump) W25252545
Insulation class IPX4D IPX4D IPX4D IPX4D

24

2.4

2.8

1.9

98.3

104.4

108.7

35

3.5

4.1

2.7

98.2

104.4

109.7

39

3.9

4.5

3.0

98

104.4

110.5

1 mbar = 100 Pa - 1 daPa ~ 1 mm H

O

2

Cold water temperature: 10 °C; Domestic hot water temperature:
85 °C

08/06/06 - 300008460-001-B MCR 24, 24/28 MI, 30/35 MI, 34/39 MI

7

Main dimensions

1 Package list (Standard delivery)

• France + Other countries

Boiler package Forced flue package

Boilers

MCR 24 HG1 DY847 CX50

MCR 24/28MI HG2 DY847 CX50

MCR 30/35MI HG3 DY847 CX50

MCR 34/39MI HG4 DY847 CX50

• Belgium

Boiler package Forced flue package

Boilers

MCR 24 BE HG5 DY847 CX50

MCR 24/28MI BE HG6 DY847 CX50

MCR 30/35MI BE HG7 DY847 CX50

MCR 34/39MI BE HG8 DY847 CX50

Horizontal

(diameter 60/100)

Horizontal

(diameter 60/100)

Vertical

(diameter 80/125)

Vertical

(diameter 80/125)

2 Serial number

The serial number can be found on the boiler's rating plate.

C000655

8

MCR 24, 24/28 MI, 30/35 MI, 34/39 MI 08/06/06-300008460-001-B

3 Mounting frame

A stand off frame is an option for easy and fast upward piping behind the boiler; a pipework kit is an option for a upward piping in



combination with the stand off frame.

4 Boiler installed

MCR 24

France + Other countries Belgium + Germany + Poland

 Return connection (Inside diameter 18 mm)  Return connection (External diameter 22 mm)
 Flow connection (Inside diameter 18 mm)  Flow connection (External diameter 22 mm)
 Gas connection (Inside diameter 18 mm)  Gas connection (External diameter 22 mm)
 Combustion air inlet (diameter 100)  Combustion air inlet (diameter 100)
 Flue gas discharge duct (diameter 60)  Flue gas discharge duct (diameter 60)
 Return storage tank (Inside diameter 16 mm)  Return storage tank (External diameter 15 mm)
¢ Outlet storage tank (Inside diameter 16 mm) ¢ Outlet storage tank (External diameter 15 mm)
 Condensates evacuation pipe (3/4")  Condensates evacuation pipe (3/4")
º Safety valve (diameter 15) º Safety valve (diameter 15)

08/06/06 - 300008460-001-B MCR 24, 24/28 MI, 30/35 MI, 34/39 MI

9

MCR 24/28MI, 30/35MI, 34/39MI

France + Other countries Belgium + Germany + Poland

 Return connection (Inside diameter 18 mm)  Return connection (External diameter 22 mm)
 Flow connection (Inside diameter 18 mm)  Flow connection (External diameter 22 mm)
 Gas connection (Inside diameter 18 mm)  Gas connection (External diameter 22 mm)
 Combustion air inlet (Ø 100 mm)  Combustion air inlet (Ø 100 mm)
 Flue gas discharge duct (Ø 60 mm)  Flue gas discharge duct (Ø 60 mm)
 Return storage tank (Inside diameter 16 mm)  Return storage tank (External diameter 15 mm)
¢ Outlet storage tank (Inside diameter 16 mm) ¢ Outlet storage tank (External diameter 15 mm)
 Condensates evacuation pipe (3/4")  Condensates evacuation pipe (3/4")
º Safety valve (Ø 15 mm) º Safety valve (Ø 15 mm)

10

MCR 24, 24/28 MI, 30/35 MI, 34/39 MI 08/06/06-300008460-001-B

MCR boilers are equipped with a control panel with electronic
regulation including security and flame surveillance by ionisation
probe.

The boiler is not sensitive to phase reversal. The normal maximum
absorbed power is between 115 W and 130 W. The boiler is entirely
pre-wired. All external connections can be made with terminal block
X9.

Boiler MCR power can be regulated in several ways:
Dry contact room thermostat (Commutation without power): The

boilers internal control will modulate the output to achieve the flow
temperature set point of the boiler. The contact is on the X9 terminal
strip (low voltage only).

All connections on terminal block X1,X2,X4,X5,X6,X7 are in



230 V.
All connections on terminal block X9 are low voltage only.

The MCR is a modular boiler whose temperature can be regulated
using one of the following solutions:

- Regulation as a function of room temperature:

- Easymatic,Easyradio communicating room regulation + Interface
PCB (AD 221)

- Regulation: Outside sensor alone

- Regulation as a function of the outside temperature + Outside
sensor alone:

- Easymatic,Easyradio + Outside sensor + Interface PCB (AD 221)

- Regulation as a function of the outside temperature with a 3­channel valve circuit:

- Easymatic or Easyradio + Outside sensor + Interface PCB (AD

222)

Operation

The MCR boiler is fitted with an electronic temperature regulator with
outlet and return temperature sensors. The outlet temperature can be
set between 20 and 85. The boiler increases or lowers power as a
function of instructions.

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11

1 Control panel

The control panel of the MCR boiler has 6 function keys, an on/off
switch and a screen. The function keys are used to read or modify
parameters and temperatures.

A Menu key

BDisplay

C Main ON/OFF switch

D Pressure gauge

E Sweep key

F "Escape" or "Reset" key

G Heating temperature adjustment key or -

H DHW temperature adjustment key or +

J Maintenance key or enter

The display includes 4 positions and several symbols which indicate
the operating status of the control panel and any disturbances.
Figures, points and/or letters may be displayed.

The symbols located above the function keys indicate their current
function.

Pressing on any key will display the current status of the boiler and
the current command code. If there is a malfunction, the
corresponding code continues to be displayed.

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MCR 24, 24/28 MI, 30/35 MI, 34/39 MI 08/06/06-300008460-001-B

2 Parameter display

The following parameters can be displayed in the information menu
:

- t1 = Flow temperature (°C)

- t2 = Return temperature (°C)

- t3 = Tank sensor (°C)

- t4 = Outside temperature (°C)

- FL = Ionisation current (µA)

- nF = Fan speed (rpm)

2.1 Setting the manual mode ()

- Press the Ä key. The symbol  flashes. To access the
parameters, press key l.

- Press the + key successively to scroll down the various
parameters.

- Press key Ä several times until the symbol  flashes on the

menu bar.

- Press the l key. The minimum outlet temperature P1 or the text

Auto is displayed if an outside temperature sensor is installed.

- Press the + key to increase the outlet temperture manually.

- To confirm, press the l key.
The installation is in manual mode.

- Press key  1 time to deactivate the manual mode.

- Press key  1 time to return to the current operating mode.

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2.2 Switching off the central heating (In summer mode)

2.3 Switching off the domestic hot water()

- Starting from the current operating status, press key .

- The symbol  and the current temperature are displayed.

- Press the - key until the OFF symbol is displayed.

- Press the l key to modify the setting.

- The symbol  appears.

production of domestic hot water: activated.



- Starting from the current operating status, press key .

- The symbol  and the current temperature are displayed.

- Press the - key until the OFF symbol is displayed.

- Press the l key to modify the setting.

- The symbol  appears.

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MCR 24, 24/28 MI, 30/35 MI, 34/39 MI 08/06/06-300008460-001-B

2.4 Modifying the water outlet temperature in the heating

installation

- Starting from the current operating status, press key .

- The symbol  and the current temperature are displayed.

- Press the + or - key to modify the value.

- To confirm, press the l key.

2.5 Setting the domestic hot water temperature

2.6 Modifying the comfort setting (ECO)

The user can consult or modify the following 3 settings:

- ON = Activation of the energy-saving setting.

- OFF = Activation of the comfort setting

- AUTO = Setting dependent on the control unit (=Factory setting).

- Press the Ä key. The symbol  flashes.

- Press the Ä key a second time. The symbol ECO flashes.

- To confirm, press the l key.

- The current operating status is shown on the display: ECO.

- Press the  key to return to the ECO menu or press the + key

to modify the status.

- To confirm, press the l key.

- Press key  1 time to return to the current operating mode.
In ECO mode: I



If the ECO mode is set to I, when the boiler is used with an
external hot water tank, the water is not heated. If the hot water
tank is empty, the tap water will therefore be cold.

In Auto mode



If the setting is on Auto and the control unit is fitted with a ECO
function, the appliance adapts to the control unit setting.
For example: The ECO setting is tripped at night during reduced
temperature operation.

- Starting from the current operating status, press key .

- The symbol  and the current temperature are displayed.

- Press the + or - key to modify the value.

- To confirm, press the l key.

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15

1 Boiler pump

Hydraulic specifications

Depending on the flow, the following diagrams represent::
manometric heights available at boiler outlet.

For a fixed flow, the manometric height available at the boiler outlet
is obtained by taking the difference between the manometric height
of the circulator pump and the loss of load in the boiler.

• MCR 24, MCR 24/28 MI

2 Expansion chamber

The boiler is fitted as standard with an 8-litre expansion tank (except
MCR34/39 MI) (Initial pressure of the expansion tank 1 bar). The total
water volume is determined according to the static height of the
installation and for an average water temperature of 80°C (Outlet :
80; Return : 60).

• MCR 34/39 MI

X: Rated net head
Y: Flow rate

: High manometric pump



: Low pressure pump



Pressure: Safety valve 3

Initial pressure of the expansion tank (bar) 0.5 1 1.5

Total water volume (litres) Volume of the expansion vessel (litres)

100 4.8 8 13.3
125 6 10 16.6
150 7.2 12 20
175 8.4 14 23.3
200 9.6 16 26.6
250 12 20 33.3
300 14.4 24 39.9

To obtain other volumes, multiply the volume of the system by one of the factors: 0.048 0.080 0.133

If the water volume is greater than 100 litres or the static height of the
system exceeds 5 metres, an additional expansion tank must be
fitted.

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MCR 24, 24/28 MI, 30/35 MI, 34/39 MI 08/06/06-300008460-001-B

Installation

Residential buildings for France

Statutory terms and conditions of installation and maintenance

The installation and maintenance of the appliance must be carried
out by a qualified professional in compliance with the statutory texts
of the codes of conduct in force, particularly :

- Order of 2 August 1977
Technical and safety rules applicable to combustible gas and
liquefied hydrocarbon installations situated inside residential
buildings and their annexes.

- NF P 45-204 standards
Gas installation, (formerly DTU 61-1, gas installations: April 1982,
addendum no 1: July 1984).

- Local Sanitary Regulations
For appliances connected to the electricity network:

- NF C 15-100 standards Low voltage electrical installation - Rules.

Establishments open to the public (France)

Statutory terms and conditions of installation

The installation and maintenance of the appliance must be carried
out in compliance with the statutory texts and rules of the codes of
conduct in force, particularly:

- Safety regulations against fire and panic in establishments open to
the public:

a. General regulations

For all appliances:

- Articles GZ - Installations operating on combustible gases and
liquefied hydrocarbons

Then, depending on use:

- Articles CH-Heating, ventilation, refrigeration, air conditioning and
production of steam and domestic hot water

b. Instructions specific to each type of establishment open to

the public (hospitals, stores, etc.)

Belgium

The boiler installation and gas connection must be carried out by a
qualified professional in compliance with the NBN D 51.003, NBN D

30.003, NBN B 61.001, NBN B 61.002 and NBN D 51.006 standards.

An ARGB approved stop valve must be fitted in the pipe leading to
and close to the boiler.

Electrical connections must comply with the instructions in the
general regulations on electrical installations (RGIE).

Belgium:the cross-section of the aeration vents, which are
compulsory in the room in which the boiler is installed, must comply
with the NBN D 51-003 standard.

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17

The boiler must not be positioned above a heat source or a



cooking appliance

- The boiler must be fixed to a solid surface, capable of bearing the
weight of the appliance and other equipment when full of water.

- To enable removal and replacement of the cladding, a space of 5
mm is sufficient on either side of the boiler.

- The IPX4D protection index authorises installation in bathrooms,
except for protection volumes 1 and 2 however.

Certificate of compliance

For the application of article 25 of the modified decree dated 02/08/
1977 and of article 1 of the modifed decree dated 05/02/1999, the
installation engineer must be in possession of the certificates of
compliance approved by the Ministries in charge of construction and
gas safety:

- Different forms (forms 1, 2 or 3) for a new gas installation,

- "Model 4" in particular after replacing a furnace with a new one.

In order to avoid damage to the boilers, it is necessary to



prevent the contamination of combustion air by chlorine
and/or fluoride compounds, which are particularly
corrosive. These compounds are present, for example, in
aerosol sprays, paints, solvents, cleaning products,
washing products, detergents, glues, snow clearing salts,
etc.
Therefore:

- Do not suck in air evacuated from premises using such
products: hairdressing salons, dry cleaners, industrial
premises (solvents), premises containing refrigeration
systems (risk of refrigerant leakage), etc.

- Do not stock such products close to the boilers.
If the boiler and/or peripheral equipment are corroded by
such chloride or fluoride compounds, the contractual
guarantee cannot be applied.

Comply with current regulations.
If using thermostatic valves, it is not necessary to fit them to every

radiator.

Never fit radiators in the room in which the room



temperature thermostat is installed with thermostatic
valves.

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1 Water treatment and connections

Fill the heating system only with non-treated drinking water (pH
between 6 and 9). If you require more information on specific
subjects, do not hesitate to contact our technical department.

If used correctly water treatment can improve the boilers efficiency
and increase the anticipated life expectancy of the boiler.

As most systems contain a variety of metals, it is considered good
practice to provide some frome of water treatment in order to prevent
or reduce the following (metallic corrosion, formation of scale and
sludge, microbiological contamination, chemical changes in the
untreated system water.

Suitable chemicals and their use should be discussed with a
specialist water treatment company prio to carrying out any work
(environmantal aspects, health aspects). Specification, age and state
of the installation, as well as manufacturer recommendations must be
considered. Think of cleaning old water installations to remove any
corrosive residue, especially black iron oxide sludge.

The boiler must not operate if chemical products are used



for cleaning.

1.1 Fitting the mounting frame

Refer to the assembly instructions supplied with the mounting

Z

frame package.

The exchanger will have to be descaled, if need be, in order to



maintain optimum performance.

It is especially important to check the concentration of inhibitors after
installing them, make the necessary modifications to the installation,
inject water in the installation and perform all maintenance operations
conform to these instructions.

To know the suitable dosage as well as which inhibitors to use with
your boiler and to acquire further information on water processing or
cleaning of the installation contact the technical service directly.

Minimum water flow

The MCR boiler is equipped with a system protection against low
flows that depends on temperature reading. By reducing boiler power
as soon as there is a risk of insufficient flow, the boiler can continue
operating. However, if the temperature difference between the out
and return heating is greater than 45°C or if the rise in heating outlet
temperature is greater than 1 °C/second, the boiler cuts for 10
minutes before authorizing start-up again. If there is no water in the
boiler or if the pump is not operating, the boiler shuts itself down
(code E7) and needs to be restarted manually.

1.2 Positioning the boiler

See "Installation instructions"

Z

1.3 Filling the siphon

products will overflow into the waste water discharge
network.

To do this, fill the siphon with water via the combustion products
discharge conduit until it overflows.

Operation while the condensation water siphon is empty



may damage the boiler. There is a danger that combustion

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19

1.4 Stove fitting connections

- Horizontal flue gas conduits must be installed with a zero gradient. The
run-off of condensates to the boiler is handled by the eccentricity of the
horizontal terminal. The terminal must be oriented according to the
figure below.

Use the mounting template provided with the boiler to position



holes to be drilled for the outlet of the horizontal forced flue.

- Static test overpressure : 1000 Pa

- Maximum leak rate : 50 l/hm2 depending on the internal surface
of the flue gas pipe

- A diameter 60 = 0.18 m

- A diameter 100 = 0.31 m

2

/m, A diameter 80 = 0.25 m2/m,

2

/m, A diameter 130 = 0.40 m2/m.

`On concentric (forced flue) flue gas evacuation systems, the

CO2 content in the annular space on the measurement pipe
can also be checked. The installation of the flue gas evacuation
is considered leak tight if the CO2 content measured is less
than 0.2%.

The cross section of the ventilation inlet in the premises for type B
connections (i.e. intake of combustive air into the premises) must be
in compliance with the prevailing standard.

- Type C appliances can only be installed with the systems
mentioned in these technical instructions (particularly concentric
pipes, terminal connection parts).

- As connections of type B

chimney conduits and type C

23

conduits are pressurised, they must be either installed outside or
in a ventilated brick sheath.

Ventilation must be ensured :

- by an opening located in the lower section, taking the air either
from the common ventilated areas or directly from outside, and

- by an opening in the upper section connected directly with the
outside.

The minimum cross section of the air vent and the openings to be
provided must be 100 cm

2

(clear cross section).

The parts of this sheath which can be dismantled must allow for
inspection of the flue gas conduit along its entire length.

Belgium

: The boiler installation and gas connection must be carried out

by a qualified professional in compliance with the NBN D 51.003, NBN D

30.003, NBN B 61.001, NBN B 61.002 and NBN D 51. 006 standards.

23

53

110850LTW7H030

Comply with the installation instructions and the information on the
authorised lengths of the flue gas pipes.

`Mount the flue gas pipe or the fresh air/flue gas evacuation

system in compliance with the assembly instructions.

`Check the tightness of the flue gas pipe.

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MCR 24, 24/28 MI, 30/35 MI, 34/39 MI 08/06/06-300008460-001-B

1.5 Classification

(s) Valid only for Belgium
(x) For Germany only

1 Homologation C

concentric pipes to a horizontal terminal (so-called forced flue)

2 Homologation C

concentric pipes to a vertical terminal (roof outlet)
or

3 Air/flue gas connection by concentric pipes in the boiler room and

single pipes in the chimney (combustive air in counter current in the
chimney)
or

4 Air/flue gas connection by concentric pipes in the boiler room and

single "flex" in the c himney (combustive air in counter current in the
chimney)

For Belgium:

Homologation C

connecting the boiler and the terminal. The clear section must
comply with the standard. The chimney must be swept before the
installation of the evacuation conduit.

5 Homologation C

means of a bi-flow adapter and single pipes (combustive air taken
from outside)

6 Homologation B

from the boiler room)

7 Homologation B

: Air/flue gas connection by means of

13(x)

: Air/flue gas connection by means of

33(x)

: Only factory components are authorised for

33(s)

: Air and flue gas connection separated by

53

: Chimney connection (combustive air taken

23P

: Cascade installation

23P

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21