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WD420/3/2007
5. 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.
It is essential that combustion is checked at high and low rate , as per Section 5.7, using a
calibrated flue gas analyser set for the relevant gas type.
5.1
INITIAL FLUSHING
All waterways within the Keston Qudos 28s and Qudos 28sP are either copper or high
alloy stainless steel. As a result water treatment chemicals for central heating boilers such
as Fernox MB1, Sentinel X100 or equivalent, 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, or
equivalent.
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 3.7 - Water
Systems. At this stage fill to a pressure of about 2.5 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. Vent the system
5.2
GAS SUPPLY
The complete gas installation up to the boiler service cock must be checked for tightness
BS 6891.
5.3
ELECTRICAL INSTALLATION
Carry out preliminary electrical safety checks, i.e. Earth continuity, Polarity, Resistance to
Earth, Short Circuit using a suitable test meter.
5.4
LP GAS
The Keston Qudos 28s and Qudos 28sP are supplied preset for the gas designated on
the boiler packing. LPG installations must use Q28SP models only.
5.5
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.
b.
Vent the water system.
Important:
The heat exchanger consists of corrugated tubes which can trap an air pocket.
Great care must be taken to ensure that water flow has been established through
the heat exchanger and thus ensuring no air pockets remain in the heat
exchanger and pipe work. Firing the boiler while an air pocket exists in the heat
exchanger could damage it.
c.
Turn the gas service cock to ON.
d.
Turn on the electrical supply, setting any external controls to call for heat. The
radiator symbol should illuminate in the top left of the display along with a "1" to
the left of the radiator symbol or a "2" to the right.
e.
Select the CH temperature using the " " of the control panel, set the CH
temperature to 80C. Press the "ENTER" button to store this setting and press the
Installation & Servicing Instructions
Chapter 5 : Commissioning
The Keston Qudos 28s & Qudos 28sP Boilers
Page : 27
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