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WD52/0/1997
4. COMMISSIONING OF THE BOILER
Important:
This condensing boiler contains components which could be damaged or blocked by grease, dirt,
solder etc., from the water system. The following commissioning procedures must be followed
precisely.
4.1
INITIAL FLUSHING
All waterways within the Keston are either copper or high alloy stainless steel. As a result
standard water treatment chemicals for conventional central heating boilers are suitable.
In any event reference must be made to BS 7593 : Treatment Of Water In Hot Water
Central Heating Systems.
a.
Disconnect the boiler from the system at the flow and return connections and
temporarily link the flow and return pipes on the system.
b.
Flush the entire system until clean water is discharged, free from dirt, flux, solder
etc. The use of a flushing chemical is recommended, e.g. Fernox Supafloc.
Sludge and scale must be removed from an existing system. Boiler failure due to
system debris or sludge shall invalidate the guarantee.
c.
Connect the system to the boiler and fill in accordance with Section 2.7 - Water
Systems. At this stage, for sealed systems, fill to a pressure of about 2.7 bar.
d.
Check the complete system for water soundness. If leaks need to be rectified
using flux and solder, the system must be flushed cold again before proceeding.
e.
Reduce the pressure to the Initial System Design Pressure for sealed systems, if
applicable. Vent the system
4.2
GAS SUPPLY
The complete gas installation up to the boiler service cock must be checked for
soundness. BS 6891.
4.3
ELECTRICAL INSTALLATION
Carry out preliminary electrical safety checks, i.e. Earth continuity, Polarity, Resistance to
Earth, Short Circuit using a suitable test meter.
4.4
LP GAS CONVERSION
All Keston condensing boilers are built and shipped as natural gas fired units. Field
conversion kits are available to convert Keston condensing boilers to use LPG. Suitable
instructions are supplied with the LPG field conversion kits.
4.5
INITIAL FIRING
Important
Checking the gas pressure to the pre-mix burner requires a special procedure, outlined
below, which must be carried out.
a.
Purge the gas supply in accordance with BS 6891.
Installation & Servicing Instructions
Chapter 4 : Commissioning
The Keston 130 Condensing Boiler
Page : 21
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