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INTRODUCTION
The Unica HE comprises a range of high-efficiency
combination boilers with outputs to DHW of 28kW, 32kW,
and 36kW respectively. These appliances – by design
– incorporate electronic ignition, circulating pump,
expansion vessel, safety valve, pressure 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 flue outlet with an annular co-axial combustion air
intake that can be rotated – horizontally – through 360
degrees for various horizontal or vertical applications. The
fig. 1
R
R
The Unica HE is approved for use with C13 & C33 type flue applications.
F
G O
I
F
G
O
I
Unica HE can also be used with the Vokera twin flue
system.
The Unica HE is approved for use with C13 & C33 type flue
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 obtained from Vokera customer services.
General layout (fig. 1)
1
Three porte valve actuator
2
Drain valve
3
Safety valve
4
Pressure switch
5
Pump
6
Bottom auto air vent (AAV)
7
Injector
8
Condense trap
9
Return sensor
10
Flue gas analysis test point
11
Flue outlet & air intake
12
Ignition transformer
13
Top AAV
14
Flow sensor
15
High limit thermostat
16
Limit thermostat
17
Sensing Electrode
18
Spark Electrode
19
Cylindric Burner
20
Condensate level sensor
21
Main heat exchanger
22
Top AAV pipe
23
Fan assembly
24
Mixer
25
Expansion vessel
26
Domestic hot water sensor
27
Domestic hot water heat exchanger
28
DHW flow switch
29
Gas valve
30
Condensing drain
R
Heating return connection
F
Heating flow connection
G
Gas connection
O
Hot water outlet
I
Cold water inlet
1
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