14. Operation
A key component of the boiler is the
ECONOX premixing, radiant, gas burner,
which is capable of producing a Variable
Controlled Output (20% to 100% ratio).
A unique feature of the ECONOX burner I
s its radiation cylinder, which has been
specially designed to suit the geometry of
the combustion chamber. It is composed of
a perforated sheet of stainless steel with a
metal fleece on its surface. On the surface
of this burner, accurate quantities of
premixed gas and air are burnt almost
without a visible flame
As a result of the extremely low combustion
temperatures produced during this process,
emissions of harmful atmospheric pollutants
are dramatically reduced, (NOx 20mg\kWh
CO 14mg\kWh).
14.1
Variable Controlled Output
The eco hometec on-board computerised
V.C.O. system with integral fault diagnostic
facility, ensures that optimum efficiency is
maintained when operating in both heating
and DHW modes.
According to the required flow temperature,
the premixing radiant burner modulates.
To save electricity, a 24-Volt, high efficiency
fan is used with a variable speed and power
capacity; if the heat demand decreases, the
fan will turn at a lower speed, which results
in a lower power consumption.
The fan is programmed to supply given
amounts of air for specific burner outputs.
This air pressure then controls the gas valve
which in turn, matches the gas pressure to
the required gas to air ratio (1:1).
The combustion gases are then passed
down through the SPIRANOX stainless
steel heat exchanger to atmosphere.
During their passage these hot gases are
used to preheat both the return water to the
boiler and the incoming combustion air, thus
ensuring that all of the available energy is
used as efficiently as possible.
14.2
Variable pump
A variable speed integral circulating pump is
supplied, which operates at different speeds
and results in a lower power consumption
(between 30 and 119 Watts).
This feature is to help maintain a
temperature difference of 20
O
C between the
flow and return temperatures on systems
using radiators.
14.3
Frost Protection
If the flow temperature falls below 8
0
C, in
order to provide frost protection, the pump
will run even though there may be no
demand for heat. If the temperature
continues to fall, at 5
0
C, the burner will also
ignite. At 10
0
C the appliance will return to
standby mode.
14.4
Year Long Protection
During summer months, the pump and
mixer valve (if fitted) are exercised daily.
This prevents seizure of internal
components thus reducing maintenance
costs.
Remember when handing over the
appliance to advise the end user on the
precautions necessary to prevent frost
damage to the system during frosty
conditions. Stress the importance of leaving
the system turned on e.g continuous low
temperature setting in extremely cold
weather.
15. Siting the Appliance
In siting the boiler, the following
limitations MUST be observed
The boiler is not suitable for external use.
The position selected for installation MUST
allow adequate space for servicing in front
and below the boiler and for the circulation
of ventilation air around the boiler. Figure 8
shows the minimum clearances required for
safety and subsequent service. The position
must allow for the correct routing of a flue
system.
EC 16~38 Installation Manual page
15
