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WD420/3/2007
1.1
INTRODUCTION
Thank you for choosing this Keston Qudos 28s for your household heating. The boiler is
designed to be very straightforward to operate and has no user serviceable parts inside the
cabinet. The following instructions are to provide you with information on the operation and
maintenance of your Qudos 28s and what to do in the unlikely event of a fault.
These user instructions should be read carefully to ensure safe and economical use of your
Qudos 28s or Qudos 28sP. The Qudos 28s model is for use with natural gas only, the Qudos
28sP model is for use with LPG only.
1.2
MAINTENANCE
Servicing
To ensure continual safe and efficient operation and to maintain product warranties it is a
requirement that the appliance is checked and serviced at least once per year. It is the law
that any servicing must be carried out by a competent person. Removal of the appliance
cabinet by anyone other than a competent person will automatically invalidate the
appliance warranty.
Clearances
If fixtures are to be positioned close to the boiler, the following minimum clearances must be
observed: Top 150mm, Left 5mm, Right 5mm, Base 200mm, Front 10mm. Extended
clearance is required to the front for servicing (300mm).
Cleaning
Normal case cleaning only requires dusting with a dry cloth. To remove more stubborn marks
wipe with a damp cloth and finish with a dry cloth.
1.3
BOILER SETUP & OPERATION
Check that the gas supply from the gas meter is turned on. Switch on the electrical supply to
the boiler. The display will now run through a self check procedure. Set any controls to call for
heat.
To light the boiler
The Qudos 28s features two temperature controls to allow different settings depending on the
source of the demand, ie heating or hot water. Identify the which setting is demanded. Using
the " " on the left of the display, select the setpoint you wish to adjust, generally the one
indicated by a radiator symbol with a "1" to the left. Set the required temperature using the "+"
or "-" buttons associated with the heating zones or hot water temperature. After the selection
of the desired tempreatures press ENTER and then preset "RESET" to return to the normal
display.
If the actual temperature is less than the desired temperature the boiler will fire and, after a
few seconds, a "flame" will appear on the display to show that the boiler is alight.
NB: Where the demand is via 0-10VDC or Opentherm the boiler setpoint is set using the
external controller in use.
Normal Operation
During normal operation the digital display will show the current boiler temperature and will
show relevant operational symbols to confirm what action the boiler is taking. If the the
"radiator", or "
function.
Installation & Servicing Instructions
Chapter 1 : User Instructions
1. USER INSTRUCTIONS
z z z z
" symbol is shown on the display the boiler is receiving a demand for that
The Keston Qudos 28s & Qudos 28sP Boilers
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