6
EVOMAX
-
Installation & Servicing
GEnERAL
Due to the compact nature of the boiler the heat stored within the
castings at the point of shutdown of the burner must be dissipated
into the water circuit in order to avoid overheating. In order to
allow pump operation after burner shutdown the boiler control box
incorporates a 4 minute pump overrun facility. In order to make
use of this, the pump must be supplied from the terminals inside
the boiler. Note: for pumps requiring a current greater than 1.3
amps inductive, they must be connected via a relay.
When sizing pumps, reference should be made to the graphs
below which show the boiler resistance against flow rates, to
achieve the required temperature differential.
Flow rates for common systems using either 11ºC, 15ºC or 20ºC
temperature differentials are given in the table below.
11
o
C
15
o
C
20
o
C
EVOMAX 30/30P
39 l/m
28.8 l/m
21.6 l/m
EVOMAX 40/40P
52.2 l/m
38.4 l/m
28.8 l/m
EVOMAX 60/60P
76.8 l/m
57.6 l/m
41.4 l/m
EVOMAX 80/80P
101.4 l/m
76.2 l/m
56.4 l/m
EVOMAX 100
n/a
95.4 l/m
72 l/m
EVOMAX 120
n/a
n/a
86.4 l/m
EVOMAX 150
n/a
n/a
108 l/m
note
.
• With the boiler firing at maximum rate, the temperature
differential should not be less than figures quoted in table
above. High flow rates required for lower temperature
differentials could lead to errosion of the heat exchanger
water ways.
• With the boiler firing at minimum rate, the temperature
differential should not be greater than 35
o
C. Lower flow
rates generating higher temperature differentials will lead to
lock out of the boiler.
• The lower the return temperature to the boiler, the higher the
efficiency.
In installations where all radiators have been provided with
thermostatic radiator valves, it is essential that water circulation
through the boiler is guaranteed. This can be best achieved
by means of a differential pressure valve, which is installed in a
bypass between the flow and return pipes. The bypass should
be fitted at least 6m from the boiler, and should use a minimum
size of 28mm pipe. The bypass should be capable of allowing
a minimum flow rate to achieve a temperature differential of no
greater than 35
o
C at minimum rate.
WAtER tREAtmEnt
these boilers incorporate an ALumInIum heat exchanger
.
ImPoRtAnt.
The application of any other treatment to this product
may render the guarantee of
Ideal Stelrad Group
INVALID.
Ideal Stelrad Group
recommend Water Treatment in accordance
with Guidance Notes on Water Treatment in Central Heating
Systems.
Ideal Stelrad Group
recommend the use of Fernox Copal or
MB1 or GE Betz Sentinel X100 inhibitors and associated water
treatment products, which must be used in accordance with the
manufacturers’ instructions.
For further information contact:
Fernox Manufacturing Co. Ltd., Cookson Electronics,
Forsyth Road, Sheerwater, Woking, Surrey, GU21 5RZ
Tel: +44 (0) 1799 521133
or
Sentinel Performance Solutions, The Heath Business and
Technical Park, Runcorn, Cheshire, WA7 4QX
Tel: 0800 389 4670
www.sentinel-solutions.net
notes.
1.
It is most important that the correct concentration of the water
treatment products is maintained in accordance with the
manufacturers’ instructions.
2.
If the boiler is installed in an existing system any unsuitable
additives MUST be removed by thorough cleansing.
BS7593:1992 details the steps necessary to clean a domestic
heating system.
3.
In hard water areas, treatment to prevent limescale may be
necessary - however the use of artificially softened water is
NOT permitted.
4.
Under no circumstances should the boiler be fired before the
system has been thoroughly flushed.
ELECtRICAL SuPPLy
Wiring external to the appliance MUST be in accordance with
the current I.E.E. (BS7671) Wiring Regulations and any local
regulations which apply. For Ireland reference should be made to
the current ETCI rules for electrical installations
The point of connection to the mains should be readily accessible
and adjacent to the boiler.
ConDEnSAtE DRAIn
A condensate drain is provided on the boiler. This drain must be
connected to a drainage point on site. All pipework and fittings in
the condensate drainage system MUST be made of plastic - no
other materials may be used.
ImPoRtAnt.
Any external runs must be insulated.
HyDRAuLIC RESIStAnCE
@ 20ºC tEmP DIff
300
250
200
150
100
50
0
0
20
40
60
80
100
120
Pressure Drop (mbar)
Flow Rate (litres / min)
30-40kW
60-80kW
100-120kW
150kW
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