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 ow 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 ring at maximum rate, the temperature
differential should not be less than gures quoted in table
above. High ow rates required for lower temperature
differentials could lead to errosion of the heat exchanger
water ways.
• With the boiler ring at minimum rate, the temperature
differential should not be greater than 35
o
C. Lower ow
rates generating higher temperature differentials will lead to
lock out of the boiler.
• The lower the return temperature to the boiler, the higher the
efciency.
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 ow and return pipes. The bypass should
be tted at least 6m from the boiler, and should use a minimum
size of 28mm pipe. The bypass should be capable of allowing
a minimum ow 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 articially softened water is
NOT permitted.
4. Under no circumstances should the boiler be red before the
system has been thoroughly ushed.
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 ttings 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)
30-40kW
60-80kW
100-120kW
150kW
206210-3.indd 6 09/06/2011 13:34:04
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