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operation
note. The pump will operate briefly as a self-check once every 24
hours, regardless of system demand.
Control of water temperature
The boiler controls the central heating radiator temperature to
o
a maximum of 80
C, adjustable via the CH temperature control
(A) or is automatically set by the weather compensation device
provided, the potentiometer adjusts the heating slope.
The Keston System is a high efficiency condensing boiler which is
most efficient when operating in condensing mode.
The boiler will operate in this mode if the CH temperature control
(A) is set to the 'e' position (economy mode). This control should
be set to maximum for very cold periods
to shut down the boiler
Set the mode control knob to OFF.
To relight the boiler
Repeat the procedure detailed in 'To light the boiler'.
Frost protection
If no system frost protection is provided and frost is likely during
a short absence from home, leave the heating controls (if fitted)
at a reduced temperature setting. For longer periods, the entire
system should be drained.
If the system includes a frost thermostat then, during cold
weather, the boiler should be turned OFF at the time switch (if
fitted) ONLY. The mains supply should be left switched ON, with
the boiler thermostat left in the normal running position.
Boiler overheat Protection
The boiler controls will shut down the boiler in the event of
overheating. Should this occur, a fault code
Refer to fault chart.
Flame Failure
Should this occur a fault code
chart.
BoiLer ConTroLs
1
Legend
A. CH Temperature Control
B. Mode Control
C. Boiler Status
Keston System -
User's
will be displayed.
will be displayed. Refer to fault
D. Burner 'on' Indicator
E. Pressure Gauge
F. Condensate Drain
A
G
C
D
E
Loss of system water pressure
The gauge (E) indicates the central heating system pressure. If the
pressure is seen to fall below the original installation pressure of 1-2
bar over a period of time then a water leak may be indicated. In this
event conduct the re-pressurising procedure as follows:
Re-pressurise via the filling loop to 1 bar (if unsure contact your
installer), turn off the tap on the filling loop and turn switch (B) to the
reset position and then back on again to reset the boiler.
If unable to do so or if the pressure continues to drop after filling a
Gas Safe Registered Engineer or in IE a Registered Gas Installer
(RGII) should be consulted.
noTe. The BoiLer WiLL noT oPeraTe iF Pressure has
rEDUCED to LESS tHAn 0.3 BAr UnDEr tHIS ConDItIon.
Condensate Drain
The condensate drain (F) must not be modified or blocked.
Blockage of the condensate drain, caused by debris or freezing, can
cause automatic shutdown of the boiler.
If freezing is suspected and the pipe run is accessible an attempt
may be made to free the obstruction by pouring hot water over the
exposed pipe and clearing any blockage from the end of the pipe.
If this fails to remedy the problem the assistance of a Gas Safe
Registered Engineer or in IE a Registered Gas Installer (RGII)
should be sought.
Escape of gas
Should a gas leak or fault be suspected contact the National Gas
Emergency Service without delay. Telephone 0800 111 999
Do not search for gas leaks with a naked flame.
Cleaning
For normal cleaning simply dust with a dry cloth.
To remove stubborn marks and stains, wipe with a damp cloth and
finish off with a dry cloth.
Do not use abrasive cleaning materials.
maintenance
The appliance should be serviced at least once a year by a Gas
Safe Registered Engineer or in IE a Registered Gas Installer (RGII).
g. Economy Mode
B
F
3
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