HeatMaster
Installation, Operating and
Servicing Instructions
HM 71
HM 101
excellence in hot water
66401100
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DESCRIPTION
CONSTRUCTION FEATURES
OPERATING PRINCIPLE
Outer body
The HeatMaster is a high performance, direct fired hot water storage
heater, which has indirect heat transfer due to its Tank-in-Tank
construction.
The outer body containing the primary fluid is made of carbon steel
(STW 22).
At the heart of the HeatMaster is a stainless steel cylinder through
which the flue tubes pass. This is surrounded by a mild steel shell
containing the primary water (neutral fluid). The outer shell extends
down to the combustion chamber and even around the flue tubes.
The area of the heat transfer surface is therefore much greater than
that of standard direct fired water heaters.
TANK-IN-TANK heat exchanger
The ring-shaped inner tank with its large heating surface for producing
domestic hot water is built of Chrome/Nickel 18/10 stainless steel. It
is corrugated over its full height by an exclusive production process
and entirely argon arc welded by the TIG (Tungsten Inert Gas)
method.
A circulating pump fitted to the primary circuit moves the water
around the tank, heating it faster and maintaining an even
temperature across the primary jacket.
Combustion gas circuit
The combustion gas circuit is paint protected and comprises:
• Flue pipes
The burner, either gas or oil, fires onto the primary water which
indirectly heats the stainless steel cylinder containing the DHW. As
with all Tank-in-Tanks, this is corrugated over its full height and
suspended in the HeatMaster by its hot and cold water connections.
HeatMaster 71/101 models contain 8 steel flue pipes with an
internal diameter of 64 mm. Each pipe is fitted with a
turbulator of stainless steel designed to improve heat
exchange and to reduce flue gas temperature.
The cylinder expands and contracts during use and this, together
with the fact that cold water does not come into contact with the
intense heat of the burner flame, means that limescale buildup is
prevented.
• Combustion chamber
The combustion chamber on HeatMaster models is entirely
water cooled.
Insulation
This scale resistant feature, along with the corrosion resistance of
stainless steel, eliminates the need for sacrifical anodes.
The boiler body is fully insulated by rigid polyurethane foam with a
high thermal insulation coefficient, sprayed on without the use of
CFCs.
The HeatMaster has one very major advantage over other direct
fired water heaters - because it heats the DHW with a primary
circuit, this primary water can be used to provide central heating as
well.
Casing
The boiler is covered by a steel casing which has been scoured and
phosphated before being stove enamelled at 220 °C.
By connecting two, three, four or more HeatMasters together in a
module, most hot water and heating demands can be met.
Burner
71 and 101 models are always delivered with ACV BG 2000-M 71
Indeed, when used in conjunction with HR and Jumbo hot water
storage tanks the Heatmaster can supply even the largest hot water
requirement.
and 101 air/gas premix burners.
Standard equipment
The HeatMaster 71/101 has the following items as standard :
- On/off switch
- Summer/Winter switch
- MCBA controller, incorporating
• electronic control and high limit thermostats
• burner modulation
- primary circulating shunt pump
- primary expansion vessels
- primary safety valve
- pressure and temperature gauge
- drain valve
- body completely insulated in rigid polyurethane foam
2
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DESCRIPTION
Top cover
Flue reduction collar
Automatic air vent
Central heating flow pipe
Domestic cold water inlet
Domestic hot water outlet
Flue pipes and turbulators
Heating circuit filling
valve with removable hose
and non-return valve
Primary expansion vessel
Primary shunt pump
Tank-in-Tank heat exchanger
Insulation
Burner
Casing front panel
Heating return
Primary circuit
Combustion chamber
Burner chamber plate
Detector NTC1 and NTC2
Detector NTC3
Low water pressure switch
Primary safety valve
3
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TECHNICAL SPECIFICATION
DIMENSIONS
The units are delivered fully assembled, tested and packed on a timber base with shockproof edges and protected by heat-shrunk plastic film.
On delivery and after unpacking, check the equipment for damage. For transport purposes, refer to the weights and dimensions given below.
G
F
K
A
B
H
C/2
J
C
D
E
A mm
1743
2093
B mm
C mm
680
D mm
937
E mm
680
F mm
390
G Ø mm
H mm
1289
1693
J mm
K mm
1720
2120
HM 71
HM 101
1630
2030
150
150
285
285
680
937
680
390
GENERAL FEATURES
HM 71
HM 101
Fuel
type
kW
kW
%
Natural gas / propane
Natural gas / propane
Maximum Input
Maximum Output
20 - 69.9
63.0
0.5
25 - 107 / 22 - 110
96.8
0.4
Maintenance loss at 60 °C of rated value
Total capacity
L
239.0
108.0
1”
330.0
130.0
1”
Primary circuit capacity
Hot water connection
L
Ø
Heating connection
Ø
11/2”
150
11/2”
150
3.95
335
83
Flue connection
Ø mm
Hot water tank heat exchange surface
Weight empty
m2
Kg
3.14
282
Pressure drop primary circuit
mbar
46
4
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TECHNICAL SPECIFICATION
MAXIMUM OPERATING CONDITIONS
HEATMASTER CONTROL SETTINGS
Maximum service pressure (tank full of water)
- Primary circuit: 3 bar
- Secondary circuit: 10 bar
Description
The 71/101 series is fitted with an electronic controller (MCBA)
which controls burner operation (ignition, safety and modulation),
and provides facilities to adapt the controller to the desired application.
Test pressure (tank full of water)
- Primary circuit: 4.5 bar
- Secondary circuit: 13 bar
The MCBA has three levels of settings : manufacturer, installer and
user. There are three temperature detectors located in the primary
and secondary circuits.
Operating temperature
Maximum temperature: 90 °C
It provides two operating modes.
Water quality
• Chlorures: < 150 mg/l (304)
< 2000 mg/l (Duplex)
1. Heating mode
Temperature set by the user at between 60 and 90 °C.
• 6 ≤ ph ≥ 8
•
•
•
•
Differential “ON”, burner starts.
Differential “OFF”, burner stops.
PI (Proportionnel Integral) regulator in “heating” mode.
The regulator compares the primary temperature with the setting
and modulates.
DOMESTIC HOT WATER PERFORMANCES
The room thermostat detects the heating demand
HM 71
HM 101
2. Hot water mode (with hot water priority)
The detector located in the secondary tank detects the hot water
demand.
When a draw-off is detected the controller goes to “hot water
demand” mode:
Peak delivery at 40 °C
Peak delivery at 45 °C
Peak delivery at 60 °C
Peak delivery at 70 °C
Peak delivery at 80 °C
L/10’
L/10’
L/10’
L/10’
L/10’
646
543
346
268
203
905
777
514
385
290
•
•
•
The primary shunt pump starts.
The heating pump switches off.
The burner starts and the controller uses the data from the
primary detector to control modulation.
Peak delivery at 40 °C
Peak delivery at 45 °C
Peak delivery at 60 °C
Peak delivery at 70 °C
Peak delivery at 80 °C
L/60’
L/60’
L/60’
L/60’
L/60’
2133
1794
1219
971
3172
2680
1813
1378
1003
710
User-accessible parameters
1. “Hot water” setting adjustable from 20 to 90 °C.
2. “Hot water” mode: ON/OFF.
3. “Heating” mode: ON/OFF.
4. “Heating” setting adjustable from 60 to 90 °C.
Continuous delivery at 40 °C
Continuous delivery at 45 °C
Continuous delivery at 60 °C
Continuous delivery at 70 °C
Continuous delivery at 80 °C
L/60’
L/60’
L/60’
L/60’
L/60’
1835
1573
1067
715
2776
2379
1665
1241
903
675
Parameters accessible in servicing
Main default settings:
Reheat time to 60 °C
min
16
13
- Hot water priority active.
- Heating demand detection by room thermostat.
- A single heating circuit.
An access code is required for “service” access.
For more technical information, contact your ACV dealer.
5
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INSTALLATION
BOILER ROOM
CHIMNEY CONNECTIONS
Important
•
•
•
Keep vents free at all times.
IMPORTANT
Do not store inflammable products in the boiler room.
Do not store corrosive products near the boiler, such as paints,
solvents, chlorine, salt, soap and other cleaning products.
If you smell gas, do not switch on the light or light a flame.Turn off
the mains gas tap at the meter and inform the appropriate
services immediately.
Boilers must be installed by an approved heating
engineer, in accordance with the prevailing local
standards and regulations.
•
Flue size should not be less then the outlet size of the
boiler.
Access
The boiler room must be large enough to allow good access to the
boiler.The following minimum distances are required around the boiler:
Chimney connection type: B23
The boiler is connected to the chimney by a metal pipe rising at an
angle from the boiler to the chimney.
A flue disconnection piece is required.
This must be easy to remove to give access to the flue pipes when
servicing the boiler.
- front
- side
- behind
- above
500 mm
100 mm
150 mm
700 mm
Ventilation
The boiler room must be fitted with top and bottom vents
according to the prevailing local standards and regulations.
A.Top vent
B. Bottom vent
C.Draught regulator
D. Inspection opening
F
The table below gives an example conforming to the Belgian standards.
E.Lined chimney height
F. Chimney diameter
Ventilation
71
101
Min. fresh air requirement
Bottom vent
Top vent
m3/h
dm2
dm2
126
2.4
2.0
194
3.20
2.0
Other countries should refer to their own standards.
Base
C
A
The base on which the boiler rests must be made of non-combustible
materials.
B
D
Chimney / minimum flue diameter
71
101
E = 5 m Ø F min.
E = 10 m Ø F min.
E = 15 m Ø F min.
mm
mm
mm
189
159
150
234
178
150
Note:
Regulations vary from country to country therefore
the table above is intended only as a guide.
Due to the high efficiency of our boilers, the flue gasses
exit at low temperature. Accordingly, there is risk that
the flue gasses could condense, which could damage
the chimney. In order to avoid this risk, it is strongly
recommended that the chimney be lined.
6
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INSTALLATION
Balanced flue boiler connection type: C
•
•
•
•
C13: concentric horizontal connection
C33: concentric vetical connection
C53: parallel chimney connection
C63: concentric vertical connection without terminal (only in
Germany and Luxembourg).
C33
120
C13
C53
Maximum length concentric : 6 metres
Maximum length parallel : 12 metres
Note: a 90 degree bend = 1 metre equivalent length
A condensation drain outlet must be fitted close to the boiler to prevent condensation products from
the chimney running into the boiler.
To avoid condensation water running out of the terminal, all horizontal flue runs must fall back
towards the boiler.
7
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INSTALLATION
Example of parallel connection
Recommended for applications with a high continuous flow.
HOT WATER CONNECTIONS
Pressure reducing valve
If the mains water pressure is greater than 6 bar, a pressure reducing
valve must be fitted.
Expansion relief valve
The tank expansion relief valve must be ACV approved and
calibrated to a maximum of 7 bar. The valve discharge must be
connected to the drain.
Hot water expansion vessel
A hot water expansion vessel must be installed.
Hot water circulation
If the tank is situated a long way from the point of use, then
installing a recirculation loop can provide a faster supply of hot water
to the outlets.
Temperature and pressure relief valve
If using the HeatMaster as an unvented hot water unit, in some
countries,
a
temperature and pressure relief valve must be
fitted - consult your ACV stockist for assistance.
Example of hot water connection with thermostatic mixer
1. Stop cock
2. Non-return valve
3. Pressure reducing valve
4. Expansion relief valve
Example of series connection
Preferable for high temperature applications with up to three units.
5. Hot water expansion vessel
6. Hot water secondary pump (if fitted)
7. Thermostatic mixing valve
8. Drawoff tap
9. Drain cock
10.Stop cock for cleaning
11.Primary circuit filling valves
12.Temperature relief valve (UK only)
6
2
8
3
1
2
7
10
11
4
12
5
Example of heating + storage connection
Recommended for applications requiring a high peak flow.
9
DANGER!
As a safety measure against scalding, we
strongly recommend installing a thermostatic
mixing valve.
8
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INSTALLATION
HEATING CONNECTION
The HeatMaster has two connections at the rear that can be used to
connect a central heating circuit. Connecting a heating system may
reduce the domestic hot water performance.
WARNING
The maximum pump motor load for the MCBA is 250
Watt. If a larger pump is required, install a relay
between the pump and the MCBA.
Expansion
HeatMaster 71/101 models are fitted with two 10 litre expansion
vessels, which are sized for hot water operation only. If a heating sys-
tem is connected to the primary circuit, calculate the expansion capa-
city necessary for the total volume of the heating system (Refer to the
technical instructions from a relevant manufacturer of expansion vessels.)
Example of a single circuit connection
1. 3-way valve.
2. Heating pump.
3. Non-return valve.
4. Isolating valve.
5. Safety valve set to 3 bar with pressure gauge.
6. Expansion vessel.
7. Drain cock.
8. Primary circuit filling valve.
9. Controller.
8
9
3
4
1
2
5
6
4
7
WARNING
The pimary safety valve is supplied with a plastic tube
connected to the discharge outlet - this is for test
purposes only and should be removed. The safety
valve should be connected to a drain using a metallic
pipe eg. copper.
9
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INSTALLATION
Alarm - module
• Connect the flat ribbon cable from the alarm-module “X7” to MCBA
connector “X8”.
ELECTRICAL CONNECTION
Power supply
The volt free relays mounted on the alarm module will now be
actived as described below:
The boiler operates with a 230 V - 50 Hz single phase supply.
A double pole isolator with a 6 amp fuse or a 6 amp MCB must be
fitted outside the boiler to allow power to be shut off during servicing
and before any repairs are carried out on the boiler.
1 - Alarm:
This contact closes if the MCBA is in lock out.
2 - External gas valve / burner - run indication:
This contact closes if a heat request is present and the fan is running.
Conformity
Boiler installation must comply with the prevailing local standards
and legislation.
3 - Domestic Hot Water pump:
This contact closes if a Domestic Hot water heat request is present.
Safety
The stainless steel tank must be earthed separately.
• Technical data:
-
-
Ambient temperature:
Contact ratings:
0…60 °C
IRMS ≤ 1A
230 V (+10% / ꢀ15%) 50 Hz
The power to the boiler must be switched off before
any work is carried out.
If inductive loads are connected, take precautions over
these loads against peak voltages (e.g. RC-network).
1
2
Internal MCBA connections
Alarm - module
X1: Connection MCBA 230 Volt
X2: 24 Volt connector
3
X3: NTC - connector
X4: NTC 5 - analogue in connector
X5: Communication / NTC 4 - connector
Connection
for transformer
X1
X2
X3
X5
X4
X8:
Ribbon cable
connection for
alarm module
(option)
X7:
Display
connection
10
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INSTALLATION
HeatMaster 71/101 and
burner wiring diagram legend
16
B.
Br.
Blue
Brown
Bk. Black
Or. Orange
G.
R.
O-W. Off-white
W.
Y.
Gr. Green
Y/Gr. Yellow / Green
BG 2000-M/101
V1 V2
13
14
15
17
1.
2.
3.
4.
5.
6.
7.
8.
9.
7-pin burner plug connector
4-pin burner plug connector
On/off switch
Power and pump connection
Central heating pump
HeatMaster shunt pump
Room thermostat
Low water pressure switch
Primary temperature detector NTC 1
L1
N
1
2
3
4
5
V1 V2
C
1
Grey
Red
White
Yellow
10. Primary temperature detector NTC 2
11. Hot water temperature detector NTC 3
12. Summer/winter switch
13. Fan power supply 230 volts
14. Fan PWM
15. Gas valve rectifier
16. Gas valve rectifier (HM 101)
17. Gas pressure switch (optional)
B
B
Br Br
Or
B5 T6 T7 T8
BG 2000-M 71/101
L1
L1
N T1 T2 S3 B4
N T1 T2 S3 B4
F
F
1
2
M
B5 T6 T7 T8
M
HEATMASTER 71/101
O-W
Bk
ACV / MCBA
X1
X2
X3
X4
1
2
3
4
5
6
1
2
3
4
5
6
7
8
9 10 11 12
1
2
3
4
5
1
2
3
Br
B
Br
B
3
Br
B
Br
G
G
Or
Y/Gr
Bk
Or
Or
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20
L1
L1
N T1 T2 S3 B4
N T1 T2 S3 B4
F
4
M
7
8
9
10
11
12
5
6
230V ~ 50 Hz
11
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COMMISSIONING
BURNER FEATURES
FILLING THE HOT WATER AND HEATING CIRCUITS
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.
IMPORTANT
The hot water tank must be pressurised before the
heating circuit is filled.
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.
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.
6
2
8
3
1
2
7
10
11
4
12
This design ensures very quiet and safe operation:
5
•
•
•
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.
9
BG 2000-M burners are preset at the factory
for natural gas.
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.
Conversion to propane:
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.
Not applicable for Belgium.
7. Switch the on/off switch to the ON position.
Conversion kit included with burner comprising:
- Cap(s)
- Nameplate(s)
- Sticker with settings.
- Mounting instructions.
Air-gas mixture control system
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).
Venturi
Fan
Air - gas
mixture
Air
Offset regulation
screw
Burner troubleshooting
See page 15-17
Gas
Gas flow
regulating screw
Spare parts
Refer to the specific document available from ACV or your distributor.
12
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BURNER FEATURES
71/101 Gas burner features
Type
HM 71
HM 101
Input
Kw
Kw
%
22.0 - 69.9
18.4 - 63.0
92.0
25.0 - 107 / 22.0 - 110 (*)
Output
23.0 - 96.3 / 20.2 - 99.0 (*)
Combustion efficiency - natural gas
Natural gas CO2
92.1
9.5
%
9.0
Gas G20 - 20 mbar - I 2E(S)B - I 2 Er - I 2H
Flow
m3/h
m3/h
m3/h
2.12 - 7.40
2.46 - 8.60
0.82 - 2.86
2.64 - 11.32
3.80 - 13.17
0.94 - 4.50
Gas G25 - 20/25 mbar - I 2L - I 2ELL
Flow
Gas G31 - 37/50 mbar - I 3P
Flow
Pressure drop combustion chamber
mbar
°C
0.6
172
1.4
165
Flue gas temperature (net)
Mass flow rate of combustion products (grammes per second)
9.2 - 32.1
11.5 - 49.2
(*) propane
Gas category
BE
X
FR
AT
X
DK
ES
UK
IT
X
PT
IE
SE
NL
LU
DE
I 2Er
I 2E(S)B
I 2H
X
X
X
X
X
X
X
X
X
X
X
I 3P
X
X
I 2L
X
I 2ELL
X
X
BG 2000-M/71
BG 2000-M/101
Burner tube
Burner tube
Ignition electrode
Ignition electrode
Air collector
Air collector
Fan
Fan
Gas valve
Gas valve
Gas inlet
Gas collector
Gas inlet
13
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MAINTENANCE
SERVICE INTERVALS
DRAINING THE BOILER
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.
Water flowing out of the drain cock may be
extremely hot and could cause severe scalding.
Keep people away from discharges of hot
water.
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 .
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.
8
9
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.
3
4
1
2
Chimney flue
Casing top panel
5
Flue reduction collar
6
4
7
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.
Flue pipe and
turbulators
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
Burner
chamber plate
6
2
8
3
1
2
7
10
11
4
Burner chamber
12
5
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).
9
-
-
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.
For the tank to be emptied, valve (9) must be situated
at ground level.
14
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USER GUIDE
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
Summer/winter switch
MCBA controller - display
On/off switch
Combined temperature and pressure gauge
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).
A
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.
B
Safety Valves
If water discharges from any of the safety valves, switch the boiler
off and call a service engineer.
15
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USER GUIDE
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.
0 80
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.
Sequence
Boiler status
Stand By, no heat request
0
1
2
3
4
5
Pre-purge, post-purge
Changing the MCBA settings: Parameter mode
Proceed as follows:
Ignition
Burning in CH-mode
•
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.
Burning in DHW-mode
•
•
•
•
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”.
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
Press the “MODE” button twice to return to standby mode.
6
7
8
9
List of accessible parameters:
Parameter N°
Description
Range
1
2
3
4
hot water setting
20 - 90 °C
“Hot water” system status
“Heating” system status
Heating setting
O = OFF; 1 = ON
O = OFF; 1 = ON
60 - 90 °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
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.
• “b29”: fan signal, incorrect fan rotation
• “b30”: T1 - T2 > Max. delta
•
•
Press the “STEP” button to display the next measurement.
To return to standby mode, press the “MODE” button once.
• “b33”: NTC3 short circuit
List of measurements available:
• “b35”: NTC5 short circuit
Measurement N°
Description
Temperature T1 - primary
Temperature T2 - primary
• “b38”: NTC3 open circuit
1
2
3
4
5
6
7
8
9
• “b40”: NTC5 open circuit
• “b52”: T5 > T5max
Temperature T3 - secondary
• “b61”: airflowsensor closed
-
• “b65”: wait for fanstart
-
A
G
H
L
t
Internal control
Setting for T1
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)
Variation of T1 - °C/s
Variation of T2 - °C/s
Variation of T3 - °C/s
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.
16
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USER GUIDE
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
codes
00
Error description
Fault repair
check wiring / - change electrode / - change MCBA
No flame detected
-
-
-
-
-
-
-
-
-
-
-
-
-
02
No ignition after 5 attempts
Internal error
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
03-07
11
Eprom error
12
Low water pressure or 24V fuse failure
13-17
18
Internal error
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
Primary temperature 1 > 110 °C
19
Primary temperature 2 > 110 °C
check that sensor NTC2 is propely housed in its pocket
if so, change sensor NTC2
25
28
Primary temperature 1 gradient too high
No fan signal
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
31
32
33
36
Short circuit in temperature 1 sensor
Short circuit in temperature 2 sensor
Hot water temperature sensor
-
-
-
-
-
-
-
-
-
-
change sensor NTC1
change sensor NTC2
change sensor NTC3
Temperature 1 sensor: circuit open
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
37
38
44
Temperature 2 sensor: circuit open
Hot water temperature sensor: circuit open
Internal error
17
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SERVICE RECORD
INSTALLATION DETAILS
Date installed:
Flue gas T° :
Efficiency :
Model :
% CO2 (min. load) :
% CO2 (max. load) :
Serial number :
Gas pressure :
Heating system pressure setting :
Gas
❏
❏ LPG
Name and signature :
SERVICE RECORD
Date serviced :
Flue gas T° :
Efficiency :
Remarks :
Remarks :
Remarks :
Remarks :
Remarks :
% CO2 (min. load) :
% CO2 (max. load) :
Gas pressure :
Gas
❏
❏ LPG
Name and signature :
Date serviced :
Flue gas T° :
Efficiency :
% CO2 (min. load) :
% CO2 (max. load) :
Gas pressure :
Gas
❏
❏ LPG
Name and signature :
Date serviced :
Flue gas T° :
Efficiency :
% CO2 (min. load) :
% CO2 (max. load) :
Gas pressure :
Gas
❏
❏ LPG
Name and signature :
Date serviced :
Flue gas T° :
Efficiency :
% CO2 (min. load) :
% CO2 (max. load) :
Gas pressure :
Gas
❏
❏ LPG
Name and signature :
Date serviced :
Flue gas T° :
Efficiency :
% CO2 (min. load) :
% CO2 (max. load) :
Gas pressure :
Gas
❏
❏ LPG
Name and signature :
18
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