VOKERA Unica i28, User Instructions

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6
All installers are asked to follow the Benchmark Scheme by
adhering to the Code of Practise, which can be obtained from
www.centralheating.co.uk.
The
Unica
comprises a range of high-ef fi ciency combination
boilers with outputs to DHW of 28kW, 32kW and 36kW respec-
tively. These appliances – by design – incorporate electronic
ignition, circulating pump, expansion vessel, safety valve, pres-
sure gauge and automatic by-pass.
The
Unica
range is produced as room sealed, category II2H3P
appliances, suitable for internal wall mounting applications only.
Each appliance is provided with a fan powered fl ue outlet with
an annular co-axial combustion air intake that can be rotated
– horizontally – through 360 degrees for various horizontal or
vertical applications. The
Unica
can also be used with the
Vokèra twin fl ue system.
The
Unica
is approved for use with C13 & C33 type fl ue ap-
plications.
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 obtained from Vokèra
customer services.
Fig. 4
General layout
1 Three porte valve actuator
2 Drain valve
3 Pressure switch
4 Safety valve
5 Pump
6 Bottom auto air vent (AAV)
7 Condense trap
8 Return thermistor (NTC)
9 Sensing Elec trode
10 High limit thermostat
11
Flow thermistor (NTC)
12 Top AAV+De-aerator
13 Flue gas analysis test p
oint
14 Flue outlet & air intake
15 Ignition
transformer
16 Flues thermistor (NTC)
17 Spark
Electrode
18 Burner
19 Main heat exchanger
20 Conveyor
21 Fan
assembly
22 Mixer
23 Expansion
vessel
24 Domestic hot water sensor
25 Domestic hot water heat exchanger
26 Condense trap
27 Gas
valve
28 DHW fl ow meter
R
Heating return connection
F Heating fl ow connection
G Gas connection
O Hot water outlet
I Cold water inlet
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