DeDietrich MCA 10 Handbuch

Q 1/7 IT2652C-en

Technical Information

MCA 10, MCA 15, MCA 25

MCA 25/28 MI, MCA 25/28 BIC, MCA 35

Wall-hung gas condensing boilers

Diagnostic aid / Heating body

JS N° IT2652C-en 09/05/2022

Preliminary

checks

carried

out

In the case of a drop in the boiler output, for example hot water not hot enough, although the

settings have not been changed:

►

Check the gas supply pressure,

►

Check that the siphon and the condensate discharge pipe are clean,

►

Flue gas discharge and the air supply pipes: Check that the pipe and the terminal are empty along their entire length,

►

Check the Ohmic value of the sensors (DHW sensor, Tank sensor,...),

►

MCA 25/28 BIC and MCA 25/28 MI : Check the state

- of the plate exchanger : clean it if required

- of the water filter cartridge : clean it if required.

Heating

body

checking

procedur

If all the above-mentioned causes have been eliminated, check the condition of the burner and

the heating body using the following procedure:

1. Check the boiler type and the gas type indicated on the rating plate:

T001539-

2. Check the value of parameter MAX.VENT.BOIL (in menu #PRIMARY LIMITS) and correct it if necessary (See

values in APPENDIX hereafter).

Q 2/7 IT2652C-en

3. Check the combustion settings O2at PMAX and PMIN, to do so:

a) Connect the flue gas analyser. Ensure that the opening around the sensor is perfectly sealed when

taking measurements.

b) In the main display, press key : the menu EMISSION MEASURMENTS is displayed

•Setting at PMAX* :

= MAX.VENT setting.

(See table below)

c) Turn the button and select PMAX : the boiler runs at PMAX maximum speed or full load.

d) Check that the fan speed displayed corresponds to the value indicated in the table below:

(Settings for France. For other countries: Refer to the instruction manual delivered with the boiler)

Values at full load

PMAX

(For France)

Gas H (G20)

Gas L (G25)

Propane (G31)

O2 (%)

MAX.VENT.BOIL

rpm O2 (%)

MAX.VENT. BOIL

rpm O2 (%)

Diaphragm

Ø mm

MAX.VENT. BOIL

rpm

MCA 10

4.7 - 5.2(1)

3300

4.4 - 4.9(1)

3300

4.7 - 5.2(1)(2)

3.00(2)

3200

MCA 15

4.7 - 5.2(1)

4500

4.4 - 4.9(1)

4500

4.7 - 5.2(1)(2)

3.00(2)

4400

MCA 25

4.7 - 5.2(1)

5600

4.4 - 4.9(1)

5600

4.7 - 5.2(1)(2)

4.00(2)

5300

MCA 25/28 MI

4.7 - 5.2(1)

4600

4.4 - 4.9(1)

4600

4.7 - 5.2(1)(2)

4.00(2)

4300

MCA 25/28 BIC

4.7 - 5.2(1)

4600

4.4 - 4.9(1)

4600

4.7 - 5.2(1)(2)

4.00(2)

4300

MCA 35

4.3 - 4,8(1)

6200

4.1 - 4.6(1)

6200

4.7 - 5.2(1)

6200

(1)

Nominal value

(2)

Fit the diaphragm for

propane into the

gas valve

e) If necessary, adjust the fan speed parameters.

For France: See APPENDIX hereafter

For other countries: Refer to the instruction manual delivered with the boiler.

f) Mesure the O2rate at PMAX (Front panel removed)

If this rate does not match the required value:

correct the gas/air ratio using the adjustment screw A on the gas valve unit:

•The screw A is a worm screw, which adjusts the restrictor A’.

Depending on the position of the restrictor A’, the O2level decreases or increases.

•Check the flame through the flame inspection window: The flame must not be detached.

*Remark: Note: In the case of the previous gas valve type VK4115V E1311, only the setting at PMIN is possible.

A’

Value at

PMAX

Value at

PMAX

Value at

PMAX

G000235

Q 3/7 IT2652C-en

•Setting at PMIN* :

= Adjustment MIN.VENT.

(see table below)

C002348-E-01

a) Turn the rotary button to select PMIN:

The boiler runs at minimum speed PMIN or low load.

b) Check that the fan speed displayed corresponds to the value indicated in the table below depending on the gas

type and the boiler model:

(Settings for France. For the other countries: Refer to the instruction manual delivered with the boiler)

Values at low load

PMIN

(For France)

Gas H (G20)

Gas L (G25)

Propane (G31)

O2 (%)

MIN.VENT.

rpm O2 (%)

MIN.VENT.

rpm O2 (%)

MIN.VENT.

rpm

MCA 10

5.9(1) - 6.3

1800

5.7(1) - 6.1

1800

5.8(1) - 6.1

2200

MCA 15

5.9(1) - 6.3

1800

5.7(1) - 6.1

1800

5.8(1) - 6.1

2200

MCA 25

5.9(1) - 6.3

1800

5.7(1) - 6.1

1800

5.8(1) - 6.1

1800

MCA 25/28 MI

5.9(1) - 6.3

1800

5.9(1) - 6.3

1800

5.8(1) - 6.1

1800

MCA 25/28 BIC

5.9(1) - 6.3

1800

5.7(1) - 6.1

1800

5.8(1) - 6.1

1800

MCA 35

5.5(1) - 5.9

1700

5.3(1) - 5.7

1700

5.8(1) - 6.1

1700

(1)

Nominal value

c) If necessary, adjust the fan speed parameters :

For France: See APPENDIX hereafter.

For other countries: Refer to the instruction manual delivered with the boiler.

d) Mesure the O2value at PMIN (Front panel removed):

e) If this rate does not match the required value:

•correct the gas/air ratio using the adjustment screw B on the gas valve unit :

Turn the screw B clockwise to increase the O2value and anti-clockwise to decrease the value.

•Check the flame through the flame inspection window: The flame must be stable and blue in colour with

orange particles around the edge of the burner.

f) Repeat the high speed test at PMAX and the low speed test at PMIN as often as necessary until the O2

values are in the indicated range.

*Remark: In the case of the previous gas valve type VK4115V E1311, only the setting at PMIN is possible.

Value at

PMIN

Value at

PMIN

Value at

PMIN

Q 4/7 IT2652C-en

4. Read the control value in the table below:

Table 1 : Control values:

Gas type: G20/G25 G31 G20/G25 BE G31 CH G20 CH

MCA 10

MAX.VENT. (rpm)

3300

3200

3300

3200

3300

Control pressure

(mbar) 4,3 3,8 4,5 3,8 4,3

MCA 15

MAX.VENT. (rpm)

4500

4400

4500

3600

4500

Control pressure

(mbar) 8,8 8,5 8,8 5,1 8,8

MCA 25

MAX.VENT. (rpm)

5600

5300

5200

2800

5600

Control pressure

(mbar) 8,1 7,4 7,4 1,84 8,1

MCA 25/28 MI

MAX.VENT. (rpm)

6200

5900

5800

Control pressure

(mbar) 10,7 9,4 9,2

MCA 25/28 BIC

MAX.VENT. (rpm)

6300

5900

5800

Control pressure

(mbar) 11,2 9,4 9,2

MCA 35

MAX.VENT. (rpm)

6200

5700

3100

6200

Control pressure

(mbar) 10,6 9,8 9,3 2,4 10,6

MCA 35/40 MI

(Belgium)

MAX.VENT. (rpm)

6400

6300

Control pressure

(mbar) 11,4 11,4

Table 1 : Control values (continued)

Gas type: G20 AT G25.3 G27 G2.350 G25.1 G230

MCA 10

MAX.VENT. (rpm)

3300

3200

3300

3200

Control pressure

(mbar)

4,3 4,3 3,8 3,8 4,3 3,8

MCA 15

MAX.VENT. (rpm)

4500

4400

4500

4200

Control pressure

(mbar)

8,8 8,8 8,2 8,2 8,8 7,5

MCA 25

MAX.VENT. (rpm)

5600

5300

5600

4900

Control pressure

(mbar)

8,1 8,1 7,1 7,1 8,1 5,9

MCA 25/28 MI

MAX.VENT. (rpm)

6200

6000

6200

5400

Control pressure

(mbar)

10,7 10,7 9,8 9,8 10,7 7,4

MCA 25/28 BIC

MAX.VENT. (rpm)

6300

6000

6200

5400

Control pressure

(mbar) 11,2 11,2 9,8 9,8 10,7 7,4

MCA 35

MAX.VENT. (rpm)

6200

Control pressure

(mbar) 10,6 10,6 10,6 10,6 10,6

Q 5/7 IT2652C-en

5. In order to determine the actual control pressure, Proceed as follows:

a) Set the boiler to holiday mode ( ) using the MODE key and

the rotary button, to supress any heating demand.

b) Use an electronic pressure gauge, which will allow to

measure a negative pressure (depression). Connect the

pressure gauge pipe on its tip marked with (-).

c) Connect the pressure gauge to the upper measuring

connection of the gas valve.

Caution: Do not forget to open the screw in the nipple!

d) Operate the boiler in chimney-sweeping mode at DHW full

load (PMAX setting) and wait until the fan has reached its

maximum speed.

e) Press key ESC to exit the chimney-sweeping mode PMAX

and read off the highest measured value displayed on the

pressure gauge during the post-operation time of the fan: the

gas valve closes and the burner goes out.

Note: if a heating request remains (antifreeze mode or

DHW demand), the burner will not go out.

6. Read off the highest measured value displayed on the

pressure gauge during the fan post-operation time (burner

off): This is the measured control pressure.

Important: The control pressure should only be measured during the post-operation time of the fan

when leaving chimney-sweeping mode PMAX, when the burner is no longer operating.

7. Compare the measured control pressure to the minimum control pressure given in the table above (Point 4).

•If the measured control pressure is equal to or higher than this value, the heat exchanger is working properly

and no further step is necessary.

•If the measured control pressure is lower than the minimum control pressure given in the table above (point

4), go to step 8.

8. Dismantle the burner to determine if it is dirty. If possible, clean the burner using compressed air (Maximum 2 bar).

If this is not possible, the burner must be replaced by a new one.

9. After cleaning or replacing the burner: repeat steps 5 to 7.

10.If this value is lower, the heat exchanger is dirty and needs to be replaced by a new one.

See hereafter: : 3. Spare parts.

Q 6/7 IT2652C-en

Spare parts

Boiler type

Reference to order in spare parts

MCA 10

MCA 15

MCA 25

MCA 25/28

MI MCA 25/28 BIC

7701124

Heating body -

(All countries)

MCA 35

7701123

Heating body -

(All countries)

CAUTION: Chemical cleaning and/or mechanical cleaning of the new heat exchanger is prohibited !

Q 7/7 IT2652C-en

APPENDIX:

SETTING THE FAN SPEEDS DEPENDING ON THE GAS TYPE

►

Display menu #SYSTEM and set the INTALLATION parameter to EXTENDED

►

Display menu #PRIMARY LIMITS, and set parameters MIN.VENT., MAX.VENT.BOIL, MAX.VENT.DHW, START

RPM to the values indicated below, according to the boiler and gas type:

iThe settings given below are for France.

For other countries: Refer to the instruction manual delivered with the boiler.

•MCA 10

Parameter

Unit

Gas H (G20)

Gas L (G25)

Propane (G31)

MIN.VENT.

rpm

1800

2200

MAX.VENT.BOIL

rpm

3300

3200

MAX.VENT.DHW

rpm

3300

3200

START RPM

rpm

3300

3200

•MCA 15

Parameter

Unit

Gas H (G20)

Gas L (G25)

Propane (G31)

MIN.VENT.

rpm

1800

2200

MAX.VENT.BOIL

rpm

4500

4400

MAX.VENT.DHW

rpm

4500

4400

START RPM

rpm

3700

•MCA 25

Parameter

Unit

Gas H (G20)

Gas L (G25)

Propane (G31)

MIN.VENT.

rpm

1800

MAX.VENT.BOIL

rpm

5600

5300

MAX.VENT.DHW

rpm

5600

5300

START RPM

rpm

3000

•MCA 25/28 MI

Parameter

Unit

Gas H (G20)

Gas L (G25)

Propane (G31)

MIN.VENT.

rpm

1800

MAX.VENT.BOIL

rpm

4600

4300

MAX.VENT.DHW

rpm

6200

5900

START RPM

rpm

3000

•MCA 25/28 BIC

Parameter

Unit

Gas H (G20)

Gas L (G25)

Propane (G31)

MIN.VENT.

rpm

1800

MAX.VENT.BOIL

rpm

4600

4300

MAX.VENT.DHW

rpm

6300

5900

START RPM

rpm

3000

•MCA 35

Parameter

Unit

Gas H (G20)

Gas L (G25)

Propane (G31)

MIN.VENT.

rpm

1700

MAX.VENT. BOIL

rpm

6200

MAX.VENT.DHW

rpm

6200

START RPM

rpm

4000

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