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14.
Servicing Instructions Intended for the Technician
Any maintenance, replace or repair activity involving a dangerous component must be done by
the manufacturer, its after-sales service or a qualified technician in order to avoid risks, even if
the device has been disconnected from the mains.
Warning - Use only original replacement parts. This heater must use design-specific parts. Do
not substitute or use generic parts. Improper replacement parts could cause serious or fatal
injuries. This will also protect your warranty coverage for parts replaced under warranty.
The technician must read this user manual prior to start replacement, repair or maintenance
activities on the heater. Please contact the manufacturer if technical support, information on
spare parts or other information about this heater is needed.
Never operate the heater in a non-authorized manner.
Maintaining, replacing and repairing parts of the heater does not require special tools. Always
check for gas leaks in the circuit or at the connections, and make sure the pressure is correct
after and before each replacement or reparation.
The appliance can be checked for soundness as below. A gas test gauge and gas leak detector
spray is required.
Step 1 -
Connect gas test gauge to gas meter.
Connect a zeroed gas test gauge to the testing point of your gas meter.
Step 2 -
Open supply valve.
Open the supply valve of the meter until the pressure increases to approximately 10 mbar.
Then, close the valve.
Step 3 -
Observe gas test gauge.
Wait for 1 minute and observe the gas test gauge. There should not be any perceptible
movement of the water in the u-tube. If the pressure rises, it demonstrates that the supply
valve is not fully stopping the gas from leaving the meter; it is 'letting-by'. The valve will need
to be checked further. You should spray leak detection spray into the valve to double-check if it
is letting-by. Gas let-by will be indicated by bubbles forming around the supply valve. If a leak
is detected, the supply valve should be repaired or replaced by a qualified gas safe engineer.
Step 4 -
Increase pressure.
If, however, there is no let-by, slowly open the supply valve and increase the pressure until the
gas test gauge reads 20 mbar. Then, close the valve.
Step 5 -
Wait for another minute.
Allow another minute for temperature stabilization. This is a period of time in which the gas
expands or contracts and adapts to the temperature environment within the pipework.
Following 1 minute, if the pressure has dropped slightly, readjust the pressure to 20 mbar by
opening the supply valve.
Step 6 -
Observe gas test gauge.
Observe the gas test gauge over the next two minutes. During this time, there should be no
pressure drop. If a drop has occurred, close the appliance isolation valves on the meter to
confirm that the meter itself is not leaking and the drop is, instead, due to a faulty gas
appliance. No drop is allowed in the system pipework if the isolation valves are closed.
Step 7 -
Remove gauge and reseal gas test point.
Following a successful test, remove the gas test gauge and reseal the gas test point on the
meter.
Re-open the inlet supply valve and apply leak detector spray to the test point and all pipework
before the valve to the supply pipe to double check that there is no leak.
Never leave the heater unattended while burning.
V. 01 – 20/06/2019
FT10CN/FT15CN/FT30CN
10
©Velleman nv
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