MKN HansDampf 10.1, Service Manual

Page: 21 / 72

Service manual
Internal gas supply check
6.x– 20.x
Leakage test
Prior to checking the connection pressure, all connection points both outside and inside the
appliance must be checked for leaks according to the technical regulations governing gas installations
(TRGI) (using a gas detector or leak spray).
Internal gas supply check of the gas blower
➢
Close the on site gas valve.
➢
Disconnect the unit from the power supply
(remove fuses or pull the connection-plug)
➢
Unscrew the two screws which are located
down on the left to remove the left side
panel.
➢
Unscrew the sealing screw from the
pressure measurement connection on the
gas valve
„OUT“ and connect a
manometer. The manometer used should
be accurate to at least 0.1 mbar.
➢
Open the on site gas valve and connect
power supply.
➢
Start up the appliance.
➢
If the gas blower runs on start speed and
the gas valve is still closed, a negative
pressure of approx. 3 mbar must be there.
The gas blower blast air and the Venturi
becomes a negative pressure.
➢
After opening of the gas valve the
negative pressure breaks in. A small
negative pressure of approx.. < 0,5 mbar
persists.
➢
After measuring the pressure and with the shut-off valve still closed, refit the sealing screw in
the pressure measuring point and check for leaks.
21
Use only TGRI-approved, foam forming agents! Do not spray leak spray onto the wires of
the ignition electronics!
Gage connection „IN“
Gage connection „OUT“