11
All installers are asked to follow the Benchmark Scheme by
adhering to the Code of Practise, details of which can be
obtained from www.benchmark.org.uk.
The
UNICA MAX
has a
ACC (Active Combustion Control)
system. This control system ensures functionality, efficiency
and low emissions under any conditions.
The ACC system uses an ionisation sensor immersed in the
burner flame, whose information allows the control board to
operate the gas valve that regulates the fuel.
This sophisticated control system provides the auto-regulation
of the combustion, so there is no need for an initial calibration.
The ACC system is able to adapt the boiler to operate with
different gas compositions, different outlet pipes lengths and
different altitudes (within the specified design limits).
The ACC system can also perform an auto-diagnostic operation
that locks out the burner before the permitted upper emission
limit is exceeded.
The
UNICA MAX
product family comprises a range of high-
efficiency combination boilers. These appliances – by design
– incorporate electronic ignition, circulating pump, expansion
vessel, safety valve, pressure gauge and automatic by-pass.
The range is produced as room sealed, category II2H3P-
II2HY203P appliances, suitable for internal wall mounting
applications only. Each appliance is provided with a fan powered
flue outlet with an annular co-axial combustion air intake that
can be rotated – horizontally – through 360 degrees for various
horizontal or vertical applications.
These appliances are designed for use with a sealed system
only; consequently they are not intended for use on open
vented systems.
This booklet is an integral part of the appliance. It is therefore
necessary to ensure that the booklet is handed to the person
responsible for the property in which the appliance is located/
installed. A replacement copy can be downloaded from the
Vokèra website - www.vokera.co.uk.
The boiler complies with basic requirements of the following
Directives:
- Regulation (EU) 2016/426;
- Yield directive: Article 7(2) and Annex III of directive 92/42/
EEC;
- Electromagnetic compatibility directive 2014/30/EU;
- Low-voltage directive 2014/35/EU;
- Directive 2009/125/EC Ecodesign for energy-using
appliances;
- Regulation (EU) 2017/1369 Energy labeling;
- Delegated Regulation (EU) No. 811/2013;
- Delegated Regulation (EU) No. 813/2013.
At the end of its life, the product should be not be disposed
of as solid urban waste, but rather it should be handed over
to a differentiated waste collection and/or recycling centre.
General layout
1 Analogue pressure gauge
2 Drain valve
3 Diverter valve
4 Pressure transducer
5 Safety valve
6 Pump
7 Lower auto air vent
8 De-aeration valve
9
Air filter
10 Flow sensor (NTC)
11 Limit thermostat
12 Main heat exchanger
13 Detection electrode
14 Burner
15 Ignition electrode
16 Ignition transformer
17 Fume analysis cap
18
Top flue outlet
19 Flue sensor
20 Expansion vessel
21 Clapet
22 Fan
23 Mixer
24 Return sensor
25 Injector
26 Gas valve
27 DHW sensor
28 Siphon
29 Flowmeter
30 DHW exchanger
R
Heating return connection
F
Heating flow connection
G
Gas connection
O
Hot water outlet
I
Cold water inlet
INTRODUCTION
INSTALLATION AND SERVICING INSTRUCTIONS
R F G O I
Fig. 3
