6
IMAX XTRA EL
-
Installation & Servicing
GENERAL
When sizing pumps, reference should be made to the Hydraulic
Resistance Table on page 7 which show the boiler resistance
against flow rates, to achieve the required temperature
differential. A Pump Kit is available as an optional extra.
Flow rates for common systems using either 11
o
C or 20
o
C
temperature differentials are given in the table below.
Boiler
Output
Water flow rate
temp. difference
11ºC (20ºF)
Water flow rate
temp. difference
20ºC (36ºF)
(kW)
l/s
m
3
/h
l/s
m
3
/h
320
6.9
24.7
3.8
13.7
395
8.6
30.9
4.7
17.0
470
10.2
36.8
5.6
20.2
545
11.8
42.6
6.5
23.5
620
13.5
48.8
7.4
26.7
Note
.
• With the boiler firing at maximum rate, the temperature
differential should not be less than 10
o
C. High flow rates
required for lower temperature differentials could lead to
erosion 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. At return temperatures of 55
o
C and below, the
difference becomes marked because the water in the flue
gases starts to condense, releasing its latent heat.
In installations where all radiators have been provided with
thermostatic radiator valves, it is essential that water circulation
through the boiler is guaranteed. A mixing header will perform
this task. Alternatively 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 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 Boilers
INVALID.
Ideal Boilers
recommend Water Treatment in accordance with
Guidance Notes on Water Treatment in Central Heating Systems.
If water treatment is used
Ideal Boilers
recommend only the
use of
SCALEMASTER SM-1 PRO, FERNOX, MBI, ADEY MC1,
SENTINEL X100 or CALMAG CM100
inhibitors and associated water
treatment products, which must be used in accordance with the
manufacturers’ instructions.
In hard water areas where mains water can exceed 200ppm Total
Hardness (as defined by BS 7593:2006 Table 2) a scale reducing
device should be fitted into the boiler cold supply within the
requirements of the local water company. The use of artificially
softened water, however, is not permitted.
Ideal Boilers
recommend the use of Fernox Quantomat, Sentinel
Combiguard,Calmag CalPhos I scale reducing devices or
Scalemaster In-line Scale Inhibitor branded Ideal, which must be
used in accordance with the manufacturers’ instructions.
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.
3.
In hard water areas, treatment to prevent lime scale 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.
For further information contact:
Fernox Alent Plc
Forsyth Road, Sheerwater, Woking, Surrey GU21 5RZ
+44 (0) 8706 015000
Sentinel Performance Solutions
7560 Daresbury Park, Daresbury,
Warrington, Cheshire WA4 4BS
Tel: 0800 389 4670
Scalemaster Water Treatment Products
Emerald Way, Stone, Staffordshire ST15 0SR
Tel: +44 (0) 1785 811636
Calmag Ltd.
Riverview Buildings, Bradford Road, Riddlesden, Keighley,
West Yorkshire BD20 5JH
Tel: +44 (0) 1535 210320
Adey Professional Heating Solutions
Gloucester Road, Cheltenham GL51 8NR
Tel: +44 (0) 1242 546700
ELECTRICAL SUPPLY
WARNING. This appliance must be earthed.
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 to avoid
freezing in cold weather causing blocking.
