ACV HM 71 User manual

12
COMMISSIONING
FILLING THE HOT WATER AND HEATING CIRCUITS
IMPORTANT
The hot water tank must be pressurised before the
heating circuit is filled.
1. Close the primary circuit filling valves (11).
2. Open the stop valve (1) and the drawoff tap (8).
When water flows out of the tap, the hot water tank is full and
the drawoff tap (8) should be closed.
3. Fill the primary (heating) circuit by opening the valves (11) and
pressurising to 1 bar.
4. Open the automatic air vent located on top of the boiler.
IMPORTANT - the screw cap must be left loose to allow future
automatic venting to take place.
5. After venting the air from the system, bring the pressure up to
the static head plus 0.5 bar: 1.5 bar = 10m and 2 bar = 15 m.
6. Check that the electrical connection and boiler room ventilation
conform to the relevant standards.
7. Switch the on/off switch to the ON position.
8. Set the temperature settings (see pages
15-16 ).
9. Check the gas supply pressure (see page 13).
10. When the burner operates, check the chimney connection for
leaks.
11. After 5 minutes of operation, turn the boiler off and vent the heating
circuit system again maintaining the water pressure at 1 bar.
12. Then restart the unit and check the combustion (see page 13).
Burner troubleshooting
See page 15-17
Spare parts
Refer to the specific document available from ACV or your distributor.
ACV BG 2000-M MODULATING
PREMIX GAS BURNERS
Description of operation:
The BG 2000-M modulating burner continually adjusts output to
demand, improving operating efficiency.
The burner tube is coated with metal fibre (NIT) which, in addition to
its remarkable heat exchange capabilities, gives greater durability.
The main components are a venturi and one (model 71) or two
(model 101) gas valves, technology specially developed by
Honeywell for low Nox premix air/gas burners with automatic ignition
and ionisation flame detection.
The pressure at the gas valve outlet is equal to the air pressure in
the neck of the venturi, less the offset.The fan sucks combustion air
through the venturi, into which the gas inlet emerges.
As it passes through, the air produces a pressure differential in the
constriction of the venturi and sucks the gas into the venturi outlet.
A perfect mix of air and gas then passes through the fan to the
burner tube.
This design ensures very quiet and safe operation:
•If there is an air blockage, the pressure differential in the venturi
falls, the gas flow diminshes, the flame goes out and the gas
valve closes: the burner is in safety shutdown mode.
•If there is a blockage in the chimney outlet, the air flow diminishes,
and the same reactions as those described above cause the
burner to shut down in safety mode.
•The BG 2000-M burner fitted to the HeatMaster 71 and 101 is
regulated by a MCBA controller (Honeywell) which controls burner
operating safety as well as temperature modulation.
BG 2000-M burners are preset at the factory
for natural gas.
Conversion to propane:
Not applicable for Belgium.
Conversion kit included with burner comprising:
- Cap(s)
- Nameplate(s)
- Sticker with settings.
- Mounting instructions.
Air-gas mixture control system
123
4
5
26
7
8
9
10
12
11
Air
Venturi Fan
Air - gas
mixture
Gas flow
regulating screw
Offset regulation
screw
Gas
BURNER FEATURES

13
BURNER FEATURES
71/101 Gas burner features
(*) propane
Gas category
Type HM 71 HM 101
Input Kw 22.0 - 69.9 25.0 - 107 / 22.0 - 110 (*)
Output Kw 18.4 - 63.0 23.0 - 96.3 / 20.2 - 99.0 (*)
Combustion efficiency - natural gas %92.0 92.1
Natural gas CO2%9.0 9.5
Gas G20 - 20 mbar - I 2E(S)B - I 2 Er - I 2H
Flow m3/h 2.12 - 7.40 2.64 - 11.32
Gas G25 - 20/25 mbar - I 2L - I 2ELL
Flow m3/h 2.46 - 8.60 3.80 - 13.17
Gas G31 - 37/50 mbar - I 3P
Flow m3/h 0.82 - 2.86 0.94 - 4.50
Pressure drop combustion chamber mbar 0.6 1.4
Flue gas temperature (net) °C 172 165
Mass flow rate of combustion products (grammes per second) 9.2 - 32.1 11.5 - 49.2
BE FR AT DK ES UK IT PT IE SE NL LU DE
I 2Er X
I 2E(S)B X
I 2H XXXXXXXX
I 3P X X XX XX
I 2L X
I 2ELL XX
BG 2000-M/71 BG 2000-M/101
Burner tube
Air collector
Ignition electrode
Fan
Gas valve
Gas inlet
Burner tube
Air collector
Ignition electrode
Fan
Gas valve
Gas inlet Gas collector

14
DRAINING THE BOILER
Water flowing out of the drain cock may be
extremely hot and could cause severe scalding.
Keep people away from discharges of hot
water.
Draining the heating circuit
1. Turn OFF the on/off switch on the boiler control panel, isolate
external electrical supply, and turn off the gas supply to the boiler.
2. Close the isolating valves (4).
3. Connect a hose to the drain cock (7).
4. Open the drain cock to drain the primary circuit.
Draining the hot water circuit
1. Turn OFF the on/off switch on the boiler control panel, isolate
external electrical supply, and turn off the gas supply to the boiler.
2. Release the pressure in the heating circuit until the pressure
gauge indicates zero bar.
3. Close stop cock (1) and turn off tap (8).
4. Open valve (9) then valve (10).
5. Let the water empty into the drain
For the tank to be emptied, valve (9) must be situated
at ground level.
MAINTENANCE
SERVICE INTERVALS
ACV recommends that boilers should be serviced at least once a year.
The burner must be serviced and tested by a competent engineer.
If a boiler is subject to heavy use, it may require servicing more than
once a year - consult ACV for advice.
SERVICING THE BOILER
1. Turn OFF the on/off switch on the boiler control panel and isolate
external electrical supply.
2. Turn off the gas supply to the boiler.
3. Remove the flue to gain access to the top of the boiler.
4. Remove the casing top panel and lift off the flue reduction collar
by undoing the fastening bolts.
5. Remove the turbulators from the flue pipes for cleaning.
6. Unscrew the burner chamber plate and remove the burner.
7. Brush the flue pipes .
8. Clean the burner chamber and the burner.
9. Re-assemble turbulators, flue reduction collar and flue, checking
that the gasket on the flue reduction collar is in good condition.
Replace gasket if necessary.
SERVICING THE SAFETY DEVICES
- Check that all thermostats and safety devices are working properly.
- Test the safety valves on the central heating and hot water circuits.
SERVICING THE BURNER
-Check that the insulation and gasket on the burner chamber plate
are in good condition - replace if necessary.
-Check and clean the burner and electrodes. Replace electrodes if
necessary (under normal use once a year).
-Check that the safety components are working properly.
-Check the combustion (CO2, CO and gas pressure) and record
the values and any remarks in the Service Record on page 18.
123
4
5
26
7
8
9
10
12
11
14 2
6
4
3
5
9
8
7
Casing top panel Chimney flue
Flue reduction collar
Burner chamber
Burner
chamber plate
Flue pipe and
turbulators

15
USING THE BOILER
Your system should be serviced at least once a year
by a qualified engineer.
If the boiler is subject to heavy use, it may require
servicing more than once a year - consult your service
engineer for advice.
Starting the burner:
In normal operation, the burner starts automatically
whenever the boiler temperature falls below the set
temperature.
Understanding the control panel
There are no user parts inside the control panel.
Heating system pressure
From time to time you may need to top up the heating
system pressure.This pressure is indicated by the combined
temperature and pressure gauge on the boiler control
panel.
The minimum pressure when the boiler is cold should be
1 bar.The precise operating pressure required depends on
the height of the building, and your installer will have
informed you of this value at the time of installation (see
Commissioning Section - Filling the hot water and heating circuits).
If the pressure falls below 1 bar, the boiler water pressure
switch will turn the boiler off until pressure is restored.
To re-pressurise, the system needs to be topped up with
water.
First, switch the boiler OFF on the on/off switch and isolate
the external electrical supply. Then remove the casing top
front panel by pulling it forward. The filling valves “A” and
“B” can now be seen. Open both valves and allow the
system to fill. When the combined temperature and
pressure gauge shows the required pressure, close both
valves. Replace the casing top front panel. Restore the
power supply and switch the boiler on.
Safety Valves
If water discharges from any of the safety valves, switch the boiler
off and call a service engineer.
USER GUIDE
On/off switch
Summer/winter switch
Combined temperature and pressure gauge
MCBA controller - display
B
A

Changing the MCBA settings: Parameter mode
Proceed as follows:
• Press the “MODE” button once; the display will show “PARA”.
Press the “STEP” button once; the first digit is “1” and the last
two show the setting for the first parameter.
• To change these last two, press “+”to increase and “-” to decrease.
• Save the new setting selected with the “STORE” button.
• To access the next parameter, press “STEP”.
• Press the “MODE” button twice to return to standby mode.
List of accessible parameters:
Temperature measurement display: Info mode
Proceed as follows:
• Press the “MODE” button twice; the display will show “INFO”.
• Press the “STEP”button once; the first digit is the measurement
number and the last two its value.
• Press the “STEP” button to display the next measurement.
• To return to standby mode, press the “MODE” button once.
List of measurements available:
16
USER GUIDE
Parameter N°
1
2
3
4
Range
20 - 90 °C
O = OFF; 1 = ON
O = OFF; 1 = ON
60 - 90 °C
Description
hot water setting
“Hot water” system status
“Heating” system status
Heating setting
Measurement N°
1
2
3
4
5
6
7
8
9
Description
Temperature T1 - primary
Temperature T2 - primary
Temperature T3 - secondary
-
-
Setting for T1
Variation of T1 - °C/s
Variation of T2 - °C/s
Variation of T3 - °C/s
008
CONTROL SETTINGS
The boiler is controlled by the MCBA (microprocessor), with the
control panel housed behind a flap on the front of the boiler - see
picture on page 16.
Standby Mode
Standby Mode is the normal operation display setting.
The first digit shows the boiler sequence.This sequence relates to
current boiler status.The last two digits show the boiler temperature.
If the burner is turned off because of an extra protection, the display
shows boiler-sequence 9 and the flow-temperature. This alternates
with the error code eg. b26.
Sequence
0
1
2
3
4
5
6
7
8
9
A
G
H
L
t
Boiler status
Stand By, no heat request
Pre-purge, post-purge
Ignition
Burning in CH-mode
Burning in DHW-mode
Waiting for opening of Air pressure switch (max. 1 Min.)
Waiting for closing of Air pressure switch (max. 2 x 1 Min.)
Burner off because the set-value has been reached
Overrun time pump in CH-mode
Overrun time pump in DHW-mode
Burner off because of protection:
(automatic restart occurs when the condition has cleared)
• “b08”: airflowsensor did not close
• “b18”: T1 > 95 °C
• “b19”: T2 > 95 °C
• “b24”: T2 - T1 > 10,20 or 40 °C after 19 minutes
• “b25”: dT1/dt > Maximum Gradient T1
• “b26”: Minimum gas pressure switch not closed
• “b28”: no fan signal
• “b29”: fan signal, incorrect fan rotation
• “b30”: T1 - T2 > Max. delta
• “b33”: NTC3 short circuit
• “b35”: NTC5 short circuit
• “b38”: NTC3 open circuit
• “b40”: NTC5 open circuit
• “b52”: T5 > T5max
• “b61”: airflowsensor closed
• “b65”: wait for fanstart
Internal control
Burner on for holding boiler warm
Burner-high function: Testmode max. RPM in CH-mode
Burner-low function: Testmode min. RPM in CH-mode
Burner on for manual fanspeed (servicing)

17
USER GUIDE
codes
00
02
03-07
11
12
13-17
18
19
25
28
31
32
33
36
37
38
44
Error description
No flame detected
No ignition after 5 attempts
Internal error
Eprom error
Low water pressure or 24V fuse failure
Internal error
Primary temperature 1 > 110 °C
Primary temperature 2 > 110 °C
Primary temperature 1 gradient too high
No fan signal
Short circuit in temperature 1 sensor
Short circuit in temperature 2 sensor
Hot water temperature sensor
Temperature 1 sensor: circuit open
Temperature 2 sensor: circuit open
Hot water temperature sensor: circuit open
Internal error
Fault repair
-check wiring / - change electrode / - change MCBA
-check ignition electrode and its positioning
-if the problem persists after 2 resets, change the MCBA
-if the problem persists after 2 resets, change the MCBA
-top up the primary circuit (see Using The Boiler - Heating System Pressure).
-call engineer to check fuse
-if the problem persists after 2 resets, change the MCBA
-check that sensor NTC1 is propely housed in its pocket
-if so, change sensor NTC1
-check that sensor NTC2 is propely housed in its pocket
-if so, change sensor NTC2
-check that the shunt pump is operating, and if so vent the boiler
-if the fan is turning:
• check the PWM connection
• if the problem persists after 2 resets, change the fan
• if the problem persists after 2 resets, change the MCBA
-if the fan is not turning:
• check the 230 Volt power to the fan
-change sensor NTC1
-change sensor NTC2
-change sensor NTC3
-check the connection of sensor NTC1 to the terminal strip
-if the problem persists, change sensor NTC1
-check the connection of sensor NTC2 to the terminal strip
-if the problem persists, change sensor NTC2
-check the connection of sensor NTC3 to the terminal strip
-if the problem persists, change sensor NTC3
-if the problem persists after 2 resets, change the MCBA
Safety shutdown
If an operating error develops, the system locks and the display
flashes: the first digit shows the sequence the burner was in when
the error occurred, the last two digits show the error code (see table
below);the first digit and the next two flash alternately.
To reset the system:
• Press the “RESET” button on the MCBA display.
• If an error occurs again, call an approved heating engineer.
Table of error codes and corrective action

18
SERVICE RECORD
Date installed:
% CO2(min. load) :
% CO2(max. load) :
Gas
LPG
Model :
Serial number :
Heating system pressure setting :
❏
❏Name and signature :
Flue gas T° :
Efficiency :
Gas pressure :
INSTALLATION DETAILS
Date serviced :
% CO2(min. load) :
% CO2(max. load) :
Gas
LPG
Remarks :
❏
❏Name and signature :
Flue gas T° :
Efficiency :
Gas pressure :
SERVICE RECORD
Date serviced :
% CO2(min. load) :
% CO2(max. load) :
Gas
LPG
Remarks :
❏
❏Name and signature :
Flue gas T° :
Efficiency :
Gas pressure :
Date serviced :
% CO2(min. load) :
% CO2(max. load) :
Gas
LPG
Remarks :
❏
❏Name and signature :
Flue gas T° :
Efficiency :
Gas pressure :
Date serviced :
% CO2(min. load) :
% CO2(max. load) :
Gas
LPG
Remarks :
❏
❏Name and signature :
Flue gas T° :
Efficiency :
Gas pressure :
Date serviced :
% CO2(min. load) :
% CO2(max. load) :
Gas
LPG
Remarks :
❏
❏Name and signature :
Flue gas T° :
Efficiency :
Gas pressure :

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