© Wikora GmbH
Page 9
As of November 2013
Errors excepted.
7.2
Volumetric method
Only possible if no extra gas is pumped into the net by the GVU.
Wobbe-Index W
0
and net heating value H
uB
to be requested from the gas supply company.
1. Take off cover plate (15), pressure adjusting screw at measure nozzle (30) and connect U-tube-manometer. Open gas
stop cock and put appliance into operation (see page 7).
2. Read existing connection flow pressure at U-tube-manometer. For natural gas, the connection flow pressure should be
between 18 mbar and 25 mbar.
3. Should the connection flow pressure vary from the above mentioned values, the cause needs to be established and the
fault to be rectified. Should this not be possible, the gas supplier needs to be contacted.
4. Open gas stop cock and put appliance into operation according to „Commissioning“ (page 7).
5. Check that the water temperature in the tank is not higher than lukewarm to 50°C, cool by emptying some water if
necessary. Turn temperature regulation button (20) to position “6”.
6. Adjust the die pressure that is stipulated in the table on page 10 by turning the pressure adjusting screw (17) of the
pressure regulator (14). The die pressure is increased by turning to the right and decreased by turning to the left.
7. Turn the temperature control button (20) to OFF position and close gas stop cock
8. Safety check: Close gas stop cock for 20 – 45 seconds. The safety pilot should audibly close after the gas stop cock has
been closed.
9. Switch the temperature control (20) button to OFF (24). Take off the U-tube-manometer only when gas stop cock is
closed. Screw in screw of the measure nozzle (30) gas tight.
10. Replace cover plate (15).
8 Conversion to other gas types
Any conversion is only to be undertaken by a registered specialist.
8.1
From natural gas to liquid gas
8.1.1.
Close gas stop cock and remove cover plate (15).
8.1.2.
Remove burner unit: Loosen screws for the gas supply line (32), ignition gas line (33) and thermal power line (31) at
the regulator. Lift the burner unit from the 2 centre bolts at the support and move everything slightly forward. Now
place on bottom tray and remove.
8.1.3.
Exchange main nozzle (40). For nozzle diameter see table on page 10.
8.1.4.
Loosen screws (41) of the ignition gas line (33) at the pilot burner (13) and exchange nozzle. The nozzle number can
be found in the table on page 10. Re-attach the ignition gas line (33) gastight by using the screws (41).
8.1.5.
Relocate burner unit on centre bolts. Screw back gas supply line (32) and ignition gas line (33) onto the regulator and
make sure that it is gastight. Screw back the thermal power line (31) hand tight.
8.1.6
Remove cover cap (25). Remove pressure regulator (14) and replace with maximum set screw No. 228. The die
pressure is about equal the connection pressure.
8.1.7.
Open gas stop cock and check pipes and gas fittings on tightness. Replace cover cap (25) and fix screws.
8.1.8
Close gas stop cock
8.1.9. Place new sticker „Type of gas“ on the gas fittings.
8.1.10 Replace cover plate (15).
8.2
From liquid gas to natural gas
8.2.1. Follow points 8.1.1 till 8.1.5
8.2.2. Remove cover cap (25). Remove maximum set screw No. 228 and
install pressure regulator (14). Set nominal load according to “Gas
regulation“ (page 8).
8.2.3. Follow points 8.1.7. till 8.1.10
8.3
From natural gas group E to natural gas group LL or vice versa
8.3.1 Close gas stop cock and remove cover plate (15).
8.3.2.
Remove cover cap (25). Set nominal load according to “Gas
regulation“ (page 8). Replace cover cap (25) and fix screws.
8.3.3 Place new sticker „Type of gas“ on the gas fittings.
8.3.4 Replace cover plate (15) and open gas cock.
