Keston K170 Installation And Servicing Instructions page 27

WD51/0/1997
Carbon dioxide is a colourless, odourless gas produced by all combustion processes.
When the Keston condensing boiler is operating properly carbon dioxide (CO
be between 8.2 and 8.9% CO
To measure CO
inside the boiler (Figure 5.7.2 item 69). Insert the probe of a combustion analysis meter
and sample the gases as instructed in the test equipment's instructions.
If the CO levels need raising increase the gas output by turning the brass screw, under
2
the metal cap in the front of the gas valve, clockwise. Reduce CO
screw anti-clockwise.
If CO levels do not respond to adjustments the burner is probably running with too much
2
gas pressure. If, for instance, a clockwise adjustment to the brass screw in the gas valve
produces a decrease in CO
for proper and complete combustion.
4.10 HANDING OVER TO THE USER
It is important to fully explain the following :
a. Procedure to light and turn off the boiler, including isolation of the electrical supply
if necessary.
b. The function of the lockout feature must be explained :
If the red light only is illuminated for more than four minutes, this means that the
boiler has failed to light. Turn off the electrical supply and wait 20 seconds. Turn
ON again and wait.
i)
ii)
c. Advise that a reduction in the water pressure reading on the gauge, for sealed
systems, indicates a leak which should be rectified before further use.
d. Advise that the appliance should be serviced by a competent person at least once
a year.
e. Advise on frost precautions.
f. Hand over User Instructions.
Installation & Servicing Instructions
Chapter 4 : Commissioning
for natural gas.
2
levels in the Keston boiler remove the 1/8" plug from the flue outlet pipe
2
the burner is too fuel-rich and not enough oxygen is present
2
If lockout recurs immediately then the gas supply should be checked as
ON, otherwise consult a Service Engineer.
If it is not possible to relight, the boiler must be isolated and a Service
Engineer called in to rectify the fault.
The Keston 170 Condensing Boiler
) levels will
2
levels by turning this
2
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