Keston Qudos 37, User'S Installation Manual

Page: 34 / 58

flue pipe joints and the
gas inlet pressure (pos.
3) (minimum 18 mbar
required for natural gas,
minimum
31 mbar
required for LP gas).
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 5.9
Timing The Gas Meter.
If the gas input cannot
be measured then it’s
compulsory
to
measure the
combustion quality as
detail in Section 5.7
Combustion Testing.
5.9 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 Time for 2 cu ft Time for 0.1 cu m
Q37 (natural gas) 56 99
Q37P (LPG) 148 260
If the meter timing is found to be incorrect when the boiler is firing at maximum rate
contact Keston Boilers Ltd for further guidance.
5.10 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 01” this means that the boiler has failed to light. Press the
“Reset” button and wait.
i)
If lockout recurs immediately then the gas supply should be checked as
ON, otherwise consult a Service Engineer.
ii) If it is not possible to relight, the boiler must be isolated and a Service
Engineer called in to rectify the fault.
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.
Complete all sections of the Chapter 10 Gas Boiler Commissioning Checklist that are
relevant to the appliance installation. The details will be required in the event of any
warranty work.
WD500 Chapter 5 : Commissioning The Keston Q37 & Q37P Boilers
Installation & Servicing Instructions Page : 29