ACV MCBA User Manual

16

MCBA FOR SPECIALISTS:
INSTALLER, SERVICE ENGINEER

SAFETY STOP (ERROR MODE)

If a fault occurs while the appliance is running, the system locks and
the screen starts to flash. The first character is an E and the next two
characters give the code for this fault, as illustratedin the table below.

Table of error codes and how to resolve them

To unlock the system:

• Press RESET on the screen.

• Contact your installer if the fault happens again.

Codes Description of the fault Resolution of the fault

Abnormal flame signal

- Check the wiring (short-circuit in the 24V wiring)

- Check the electrode/ replace the MCBA (water damage).

No flame signal after five attempts at firing the boiler

- Check the ignition cable, the electrode and the
position of the electrode.

- Check that there is gas at the burner.

Persistent lock - Press RESET

EPROM error

-If the problem persists after two RESET attempts,
replace the MCBA.

Max input, thermostat open or 24V fuse gone.

- Check the wiring and check the
24V fuse on the MCBA.

Internal error

- If the problem persists after two RESET attempts,

replace the MCBA.

T1 > 110°C

- Check the NTC wiring and replace if necessary.

T2 > 110°C - Check the NTC wiring and replace if necessary.

T1 gradient too high

- Check that the pump is turning. If there is

no problem with the pump, drain the system.

No fan signal present

- If the fan is working:

• Check the fan control connection and the fan wiring

• if the problem persists after 2 RESET attempts, replace the

fan

• if the problem persists, replace the MCBA.

- If the fan is not working:

• Check that the fan 230V connection. If the problem persists,

replace the fan.

NTC 1 short-circuit

- Check the connection and the NTC1 wiring

If the problem persists, replace the NTC1.

NTC 2 short-circuit

- Check the connection and the NTC2 wiring

If the problem persists, replace the NTC2.

NTC 3 short-circuit

- Check the connection and the NTC3 wiring

If the problem persists, replace the NTC3.

NTC 1 connection open

- Check the connection and the NTC1 wiring

If the problem persists, replace the NTC1.

NTC 2 connection open

- Check the connection and the NTC2 wiring

If the problem persists, replace the NTC2.

NTC 3 connection open

- Check the connection and the NTC3 wiring

If the problem persists, replace the NTC3.

Internal error

- If the problem persists after two RESET attempts,

replace the MCBA.

Error while reading the parameters Press RESET. If the error persists, replace the MCBA.

Problem with the power supply to the fan

Check the MCBA power supply voltage. If it is OK, replace
the fan.

To

17

MCBA FOR SPECIALISTS:

INSTALLER, SERVICE ENGINEER

SETTING THE PARAMETERS

Parameter mode

To access Parameter mode when the system is in Pilot mode, press MODE once.

To scroll through the list of parameters, simply press “step”.To modify a parameter value, use the + or - keys.
Then press “Store” to save the value you just changed.The screen flashes once to confirm the data has been saved.

To activate the parameters you changed, press “Mode” once more (which brings you into Info mode). However, if you do not press a key, the
system returns to Pilot mode after 20 minutes and automatically enables the changes.

MODE

Adjusting the hot water temperature

STEP

STEP

STEP

STEP

Minimum central heating temperature when using an outdoor sensor

STEP

Minimum outdoor temperature
(adjust the heating curve)

STEP

Maximum outdoor temperature
(adjust the heating curve)

STEP

Frost protection temperature

STEP

Correction based on the outdoor temperature

STEP

Blockage T 0 = Disabled

90

01

01

90

60

0

20

- 15

00

00

STEP

Key Display Description of parameters Factory setting

Key Screen Description of parameters Factory setting

Key Display

Parameters for the specialist: only accessible by using the Code

Booster 00 = Stop (minute)

STEP

00

Production
of hot water

00 = Stop
01 = Start
02 = Stop + pump continuously on
03 = Start + pump continuously on

Turn on/Turn off
the heating

00 = Stop
01 = Start
02 = Stop + pump continuously on
03 = Start + pump continuously on

Maximum temperature in Central Heating mode

18

MCBA FOR SPECIALISTS:
INSTALLER, SERVICE ENGINEER

Night-time heating temperature reduction (°C)

STEP

Fan speed in heating mode (rpm x 100)

STEP

10

52

Key Display Description of the parameters Factory setting

Max. fan speed in heating mode (rpm x 100)

STEP

00

Max fan speed in hot water mode (rpm x 100)

STEP

57

Max. fan speed in hot water mode (rpm x 100)

STEP

00

Min. fan speed (rpm x 100)

STEP

15

Min. fan speed (rpm x 100)

STEP

00

Fan speed at ignition (rpm x 100)

STEP

37

Heating pump time delay 0 = 10 sec (minute) 00

STEP

Hot water pump time delay 10.2 = 10 sec (minute) 16

00

01

01

03

STEP

Burner interlock hysteresis (heating)

STEP

Burner trigger hysteresis (heating)

STEP

Burner interlock hysteresis (hot water)

STEP

Burner trigger hysteresis (hot water)

STEP

04Hot water mode interlock hysteresis

STEP

Hot water mode trigger hysteresis

STEP

01

19

MCBA FOR SPECIALISTS:

INSTALLER, SERVICE ENGINEER

Heating lock time (sec x 10.2)

STEP

Hot water lock time (sec x 10.2)

STEP

Lock time to switch from hot water mode to heating mode
(sec x 10.2)

STEP

Difference T1 - T2 for modulation

STEP

BUS address (-1 = disabled)

STEP

Increase the primary temperature value to generate hot
water (relative to the hot water temperature)

STEP

1st digit: heating circuit (AM3-11 – 4-way valve)
0 = disabled 5 = enabled

2nd digit: the demand for heat comes from:
0 = room thermostat

STEP

00

00

00

05

- 01

05

00

Key Display Description of the parameters Factory setting

1st digit: Hot water circulator pump (= 1)

2nd digit: tank with NTC3 sensor (= 2)

STEP

Manual fan speed (- 01 = modulation)

12

- 01

11

00

60

30

01

00

STEP

1st digit: PWM pump operating speed

2nd digit: PWM pump speed during time-delay

STEP

Holding temperature

STEP

Maximum temperature for the heating circuit outlet
(AM3-11 – 4-way valve)

STEP

Minimum temperature for the heating circuit outlet
(AM3-11 – 4-way valve)

STEP

Hysteresis of the heating circuit outlet temperature
(AM3-11 – 4-way valve)

STEP

1st digit: Special pump (0 = disabled)

2nd digit: Minimum disable cycle (0 = disabled)

STEP

20

MCBA FOR SPECIALISTS:
INSTALLER, SERVICE ENGINEER

INFORMATION ON THE INSTALLATION

Info mode

To switch from Pilot mode to Info mode, press “Mode” twice.

ENTERING THE CODE

Code mode

You can access the following parameters by entering the service
code:

• Parameters 5 - 42

• Communication mode

• Fan Speed mode

• ERROR mode

MODE

MODE

Start temperature T1 in °C

STEP

Return temperature T2 in °C

STEP

Hot water temperature T3 in °C

STEP

Outdoor temperature T4 in °C

STEP

Not used

STEP

Start temperature calculated in °C

STEP

Rate of increase in the start
temperature in °C/s

STEP

Rate of increase in the return
temperature in °C/s

STEP

Rate of increase in the hot water
temperature in °C/s

STEP

Heating circuit outlet temperature
(AM3-11 – 4-way valve)

STEP

Press “STEP” until the system displays the information you need.
The point located behind the first position flashes to indicate that
the boiler is in “INFO” mode.

Key Display Description of parameters

Key Display

STEP

STORE

MODE STEP

+

or

-

Press “STEP” once and the system displays “C”

in position 1, followed by arbitrary

characters in positions 3 and 4.

Press “STORE”, the screen flashes

briefly to indicate that the code has been accepted.

Press “MODE” until

the system displays the correct mode.

Press “+” or “-” to change the code.

Only ACX authorised installers know the access code.

For further information, please contact our after-sales
department.

To access Code mode, press

MODE and STEP simultaneously

(only from Pilot mode!).

21

MCBA FOR SPECIALISTS:

INSTALLER, SERVICE ENGINEER

COMMUNICATION MODE (WITH CODE)

When in this mode, the system displays the communication between
the boiler and the control module, the optional interface kit or the
optional programmable room thermostat.

FAN MODE (WITH CODE)

ERROR MODE (WITH CODE)

“ERROR” mode indicates the most recent error, as well as the
status of the boiler and its readings at the time this error occurred.

Fan speed

MODE

The current fan speed is 5,500 rpm.

STEP

Key Display Description of parameters

MODE

Code mode

(See the table on page 16 for a full list)

STEP

Status of the boiler at the time of the
error (See the table on page 16)

STEP

Start temperature T1 at the time of
the error

MODE

Return temperature T2 at the time of
the error

STEP

Hot water temperature T3 at the time
of the error

STEP

Outdoor temperature T4 at the time of
the error

STEP

Key Display

Key Display Description of parameters

MODE

No communication

Communication between the boiler
module and the optional control
modules only (RMCI)

STEP

Communication between all the
devices connected

Key Display

Key Display Description of parameters

Temp. °C R Ω Temp. °C R Ω

-20 98200 40 6650

-15 75900 45 5520

-10 58800 50 4610

-5 45900 55 3860
0 36100 60 3250
5 28600 65 2750

10 22800 70 2340
15 18300 75 1940
20 14700 80 1710
25 12000 85 1470
30 9800 90 1260
35 8050 95 1100

100 950

Temperature sensor resistance tables

22

SPARE PARTS

No. Jackets Codes HeatMaster®201

A01 Right side 21471415
A02 Left side 21471415
A03 Right side rear corner 21478415
A04 Left side rear corner 21473415
A05 Rear panel 21474415
A06 Right side front corner 21472415
A07 Left front side 21479415
A08 Upper front panel 2147A415
A09 Lower front panel 2147B415
A10 Burner cover 21476415
A11 Rear top cover 21475415
A12 Front top cover 21475416
A13 Rear half-base 2147S415
A14 Unequipped control panel 21477416
A15 Body + accessories (package No. 1) 27300047

No. Accessories

B01 Low-water-level pressure switch 557D3011
B02 Wilo circulator pump 557A4007
B03 3 bar / Ø 3/4” - 1” safety valve 557A1048
B04 Burner chamber insulating cover 51700041
B05 8-l expansion vessel 55301200
B06 Steam trap, Ø 1/2” 557A3001
B07 Drain cock, Ø 3/4” 557A1000
B08 Fill set, Ø 1/2” 55426018
B09 Type A, high-level turbulators 507F2009
B10 Type B, low-level turbulators 507F2010

No. Setting and electrical accessories

C01 MCBA 537D8016
C02 Transformer 547D3021
C03 NTC Duplo (NTC1 - NTC2) 5476G002
C04 NTC Single (NTC3) 5476G003
C05 Module AM3-11 10800080
C06 Module AM3-2 10800060
C07 Full control panel 24614133
C08 Display 537D3020
C09 Display case 537D3023
C10 Pressure gauge-thermometer 54441008
C11 ON/OFF switch 54766016
C12 Summer/Winter switch 54766017
C13 Control panel self-adhesive 617G0105

No. Burner

D01 Full burner 237D0118
D02 Fan 537D3034
D03 Venturi 537D4042
D04 110 x 3.5mm O-ring 557A0045
D05 Plate fan seal 557A0040
D06 Burner chamber plate seal 557A0020
D07 Ø 98mm burner tube + NIT 537DZ019
D08 Chamber plate sealing cord 51700025
D09 Ignition electrode 537DZ020
D10 Ignition cable 25760046
D11 Burner chamber plate insulating stone 51700040
D12 Burner chamber plate 2147P416
D13 Gas valve 537D4041
D14 Valve flange 537D8021

23

SERVICE RECORD

Service date:

% CO2 (min. load):

% CO2 (max. load):

Gas

Propane

Model:

Serial number:

Heating system pressure setting:

❏
❏

Name and signature:

Flue gas T°:

Efficiency:

Gas pressure:

INSTALLATION DETAILS

Service date:

% CO2 (min. load):

% CO2 (max. load):

Gas

Propane

Comments:

❏
❏

Name and signature:

Flue gas T°:

Efficiency:

Gas pressure:

SERVICE NOTES

Service date:

% CO2 (min. load):

% CO2 (max. load):

Gas

Propane

Comments:

❏
❏

Name and signature:

Flue gas T°:

Efficiency:

Gas pressure:

Service date:

% CO2 (min. load):

% CO2 (max. load):

Gas

Propane

Comments:

❏
❏

Name and signature:

Flue gas T°:

Efficiency:

Gas pressure:

Service date:

% CO2 (min. load):

% CO2 (max. load):

Gas

Propane

Comments:

❏
❏

Name and signature:

Flue gas T°:

Efficiency:

Gas pressure:

Service date:

% CO2 (min. load):

% CO2 (max. load):

Gas

Propane

Comments:

❏
❏

Name and signature:

Flue gas T°:

Efficiency:

Gas pressure:

24

SERVICE RECORD

Service date:

% CO2 (min. load):

% CO2 (max. load):

Gas

Propane

Comments:

❏
❏

Name and signature:

Flue gas T°:

Efficiency:

Gas pressure:

Service date:

% CO2 (min. load):

% CO2 (max. load):

Gas

Propane

Comments:

❏
❏

Name and signature:

Flue gas T°:

Efficiency:

Gas pressure:

Service date:

% CO2 (min. load):

% CO2 (max. load):

Gas

Propane

Comments:

❏
❏

Name and signature:

Flue gas T°:

Efficiency:

Gas pressure:

Service date:

% CO2 (min. load):

% CO2 (max. load):

Gas

Propane

Comments:

❏
❏

Name and signature:

Flue gas T°:

Efficiency:

Gas pressure:

Service date:

% CO2 (min. load):

% CO2 (max. load):

Gas

Propane

Comments:

❏
❏

Name and signature:

Flue gas T°:

Efficiency:

Gas pressure:

Service date:

% CO2 (min. load):

% CO2 (max. load):

Gas

Propane

Comments:

❏
❏

Name and signature:

Flue gas T°:

Efficiency:

Gas pressure:

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