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Oil/gas special boilers
UNIMAT
6 720 807 794 (2013/04)
1
Oil/gas special boilers
1.1
Types and heating output
The UNIMAT UT-L boilers are special boilers for positive
pressure combustion in accordance with the
requirements of EN 303. They are constructed with
reference to the guidelines of the relevant TRD 300.
Bosch offers these boilers in the output range from
650 kW to 19200 kW.
The boilers are designed to produce low pressure hot
water with no more than 110 °C (shutdown temperature
of the high limit safety cut-out) for heating systems that
correspond to the requirements of DIN-EN 12828. The
boiler is available with excess pressures of 6 bar, 10 bar
and 16 bar.
1.2
Overview of models
Fig. 1
UNIMAT UT-L boiler without heat exchanger
Fig. 2
UNIMAT UT-L boiler with heat exchanger or
condensing heat exchanger
1.3
Possible applications
The modular design and additional equipment mean the
boiler can be used in any application. A suitable version
is available for the requirements of any project.
The optimum application is in large-scale systems, e.g.
hospitals, industrial plants, district heating centres,
heating stations and commercial operations.
1.4
Features and benefits
•
3-pass design
The 3-pass technology enables the UNIMAT UT-L
boilers to achieve outstanding combustion figures.
•
Optimised temperature characteristics
The boilers have a generously sized secondary heating
surface in the second pass, designed as a double row.
The inner hot gas reversing chamber, which is
completely surrounded by water, enables very low
temperatures in the front reversing area from the
second to the third pass. This significantly reduces
the thermal load of the door.
•
Compact construction
The symmetrical secondary heating surfaces,
arranged in a circle around the combustion chamber,
enable the compact construction of these boilers.
This means they have a low weight and require only a
small floor area for installation. The burner door can
close on the right hand or left hand side.
•
Environmentally responsible with low emissions
The 3-pass design and water-cooled combustion
chamber offer ideal conditions for operation with low
emissions, especially in conjunction with the
advanced burners that are matched to the boilers.
Meeting the highest demands regarding low
emissions, especially with oil combustion, is no
problem for the UNIMAT UT-L boiler with its
particularly large combustion chambers.
•
Economic viability
Extremely high efficiency is possible, subject to the
temperature of the heating medium and the boiler
load. The radiation losses of the boiler are negligibly
low and the full utilisation of the burner control range
enables good efficiency at partial load.
•
Operational reliability
Due to the optimised design of the combustion
chamber and the water guide system, the UNIMAT UT-
L boiler is very reliable and safe in operation. The low
water capacity enables a short heat-up time. This
means the dew point range in the heat-up phase is
quickly passed.
•
Even load distribution
For even load distribution, the boiler is equipped with
a base frame of channel sections. If the floor of the
boiler room is even, an additional boiler foundation is
not required.
•
Simple maintenance
The front boiler door can be pivoted right out, and can
be opened easily even when the burner is fitted. When
the door is open, the combustion chamber and
secondary heating surface are freely accessible, and
can be cleaned quickly and easily. The reversing
chamber is visible through the combustion chamber.
As an option, an inspection port on the water side is
available. This gives a better view of the heating
Unit
UNIMAT UT-L boiler
Boiler size 650 to
19200
Safety temperature
°C
≤
110
Safety pressure
bar
≤
16
Measurements
page 12 f.
Technical Data
page 25
Table 1 Overview of UNIMAT boiler models UT-L
6 720 642 347-82.1il
6 720 642 347-83.1il