Technical information

are not used, the eco hometec guarantee
will become null and void.
6.2 Expansion Vessels

The EC25 Compact is designed for
connection to a fully pumped sealed heating
circuit only
.
A suitable sized expansion vessel is
required to accommodate volume change
(expansion of water) when heated up to
maximum operational temperature.
Select an expansion vessel that matches
the volume of the CH system and the static
pressure. Expansion vessels should be
connected to the system at a point close to
the pump inlet in order to maintain positive
pressure throughout the system.
Installation should comply with BS7074 part
1 and BS5449.
7. Introduction
The boiler features the very latest in
technology.
The boilers incorporate a premixing, fully
modulating, gas burner, 3 bar pressure
relief valve, manometer and circulating
pump.
7.1
Variable Controlled Output
Unlike most boilers that simply switch on
and off the boiler incorporates an integral
compensating and modulating digital
controller that automatically adjusts the
boilers output depending on system load
requirements.
This feature, Variable Controlled Output,
(VCO) is the very latest from eco hometec
in condensing technology and ensures the
boiler maintains optimum efficiencies even
when operating at part load.
7.2
Emissions.
A further benefit of this very accurate
combustion process is the dramatic
reduction of the harmful emissions NOx 8.1
– 27.1 ppm and CO 2.9 – 66ppm.
7.3
PPS Plastic Flue System
Due to the extremely low temperature flue
gases the boiler may be flued using the
lightweight and corrosion resistant eco
hometec PPS plastic flue system.
7.4 Approvals
The unit has been approved according to
the European standards (CE) and the
requirements for cleaner combustion (RAL
UZ61)
7.5 Additional Features
A unique corrosion resistant stainless steel
condensate heat exchanger.
Integral sensors (PTC) for monitoring flow
and return water temperatures.
3 way switching valve and facilities for
connection to an eco hometec DHW storage
module or similar.
Computer controlled combustion analysis
with built in fault diagnosis facility. These
readings can be down loaded onto a PC by
using a interface cable and software
available from eco hometec.
8. Description of Appliances
8.1 EC 25 H Compact
The ‘H’ model is suitable for a central
heating system with hot water and heating
circuit(s) controlled using two or more zone
valves.
The appliance produces a low temperature
output for under-floor heating or a
fixed/variable temperature output for
connection to radiators. Flow temperature
to hot water cylinder can be set as required
(max. 85
O
C)
Hot water cylinders must be double feed
indirect and to aid efficiency and fast
recovery times (all appliances are hot water
priority) should be of the high recovery type.
Recommended minimum coil capacity
25kW.
The unit has a variable capacity of 32 to
100%, while the maximum capacity can be
Page 8 ECO HOMETEC
(
UK
)
LTD
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