Water Treatment - Keston HEAT 2 45 Installation & Servicing

Keston Evomax 55 - Hydraulic System Capacity
8
Available System Capacity
30 deg C differential
7
25 deg C differential
20 deg C differential
6
15 deg C differential
5
4
3
2
1
0
30 40
Water Flow Rate [L/m]
Keston Heat 2 55 - Hydraulic System Capacity
Keston Evomax 45 - Hydraulic System Capacity
8
Available System Capacity
25 deg C differential
7
20 deg C differential
15 deg C differential
6
11 deg C differential
5
4
3
2
1
0
30 40
Water Flow Rate [L/m]
Keston Heat 2 45 - Hydraulic System Capacity
The schematic below illustrates a recommended approach to
using an additional system pump. The additional system pump
should be sized to overcome the index circuit resistance only as
the boilers integral pump will overcome boiler resistance.
If an additional pump is required the selected pump must comply
with BS 1394.
Boiler
Safety
Valve AAV
42mm
Header
Installation of air bleed valves at the high spot(s) in the system will
allow for air elimination when filling the system and will allow re-
venting in a day or so after all air has been driven out of solution.
10
SECTION 1 - GENERAL
50 60 70
50 60 70
Additional
System
Pump
Primary Flow
Primary Return
Note.
• With the boiler firing at minimum rate, the temperature
differential should not be greater than 35
generating higher temperature differentials will lead to lock out
of the boiler.
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.

1.10 WATER TREATMENT

These boilers incorporate an ALUMINIUM heat exchanger.
IMPORTANT. The application of any other treatment to this
product may render the warrnaty of Keston Heating INVALID.
Keston recommend Water Treatment in accordance with
Guidance Notes on Water Treatment in Central Heating Systems.
If water treatment is used Keston recommend only the use of
SCALEMASTER SM-1 PRO, FERNOX, MBI, ADEY MC1, SENTINEL
inhibitors and associated water
X100 or CALMAG CM100
treatment products, which must be used in accordance with the
manufacturers' instructions.
For further information contact:
Fernox
www.fernox.com
Tel: +44 (0) 3301 007750
Sentinel Performance Solutions
www.sentinelprotects.com
Tel: +44 (0) 1928 704330
Scalemaster Water Treatment Products
www.scalemaster.co.uk
Tel: +44 (0) 1785 811636
Calmag Ltd.
www.calmagltd.com
Tel: +44 (0) 1535 210320
Adey
www.adey.com
Tel: +44 (0) 1242 546700
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.
C. Lower flow rates
o
Installation & Servicing