Keston C40 Installation And Servicing Instructions page 29

WD265/0/2002 Chapter 4 : Commissioning
If all joints are sound and the gas
inlet pressure is satisfactory check
the gas input by timing the gas meter
as detail in Section 4.9 Timing The
Gas Meter. If the gas input cannot be
measured then it's compulsory to
measure the combustion quality as
detail in Section 4.7 Combustion
Testing.
4.9 TIMING THE GAS METER
After the boiler has been started, and
with no other appliances using gas, time the gas meter to be certain that the unit is
running at the proper gas input. Determine the cubic feet of gas passing through the
meter and determine the input in Btu per hour. Input must be within plus or minus 5% of
the rated input.
Time, in seconds, the time taken to pass 2 cubic feet of gas through the meter (i.e. one
revolution of a 2 cu ft dial) or 0.1 cubic metres if the meter is of the new metric digital type.
Model
C40 (natural gas)
C40P (LPG)
C55 (natural gas)
C55P (LPG)
If the meter timing is found to be incorrect when the boiler is firing at maximum rate
contact Keston Boilers Ltd for further guidance.
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 display shows "E 02" this means that the boiler has failed to light. Press the
"Reset" button and wait.
i)
ii)
c. Advise that a reduction in the water pressure reading on the system pressure
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 the frost protection and pump/fan exercise feature.
f. Hand over User Instructions.
Complete all sections of the Chapter 9 Gas Boiler Commissioning Checklist that are
relevant to the appliance installation. The details will be required in the event of any
warranty work.
g. Advise the user that a plume of water vapour (steam) from the flue terminal is
normal and that there is no need for concern.
Installation & Servicing Instructions
Time for 2 cu ft
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 C40, C40P, C55 & C55P
Time for 0.1 cu m
48
125
39
105
85
221
68
185
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