© Wikora GmbH
Page 8
As of November 2013
Errors excepted.
7 Gas regulation
All appliances are compliant with the kind of gas shown on the additional sticker “Type of gas” placed on the appliance. Should
other gas be used the appliance is to be adjusted accordingly (see page 9). The performance of the appliance is to be set
according to the nozzle pressure method or the volumetric method. This is only to be undertaken by a recognized specialist.
Both methods require a U-tube-manometer.
Remark: The nozzle pressure method is more time-saving and therefore the preferred option. If operated with liquid gas the
regulation of the nominal load is obsolete. It is sufficient to check the flame according to DVGW-TRF regulations. All flames
have to be burning uninterrupted and with as little green core as possible and not beat back. When liquid gas is used the
connection pressure is to be monitored and regulated at the separate pressure measure device on the gas supply unit. It has to
be at 50 mbar + 5 mbar.
7.1
Nozzle pressure regulation method
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.
2. Open gas stop cock and put appliance into operation (see page 7).
3. Read existing connection flow pressure at U-tube-manometer. For natural gas, the connection flow pressure should
be between 18 mbar and 25 mbar.
4. 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.
5. 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.
6. Remove screw of the measure nozzle (21) and connect U-tube-manometer.
7. Open gas stop cock and put appliance into operation according to „Commissioning“ (page 7).
8. 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”.
9. Take off cover cap (25) and 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. Replace the cover cap (25) and put the screws in place.
10. Turn the temperature control button (20) to OFF position. (Align marking (24) with marking (26)). Close gas stop
cock, remove U-tube-manometer and screw in the screws of the measure nozzle (21) gas tight.
11. Check if the right nozzle has been used and then proceed with a rough check on the gas meter in l/min (see gas flow
rate table 9.2). Do not adjust the die pressure if the discrepancy of the rough count represents less than 10% of the
value of gas consumption in l/min shown in the gas flow rate table. If the gap is larger than 10%, the die pressure is
not correctly set.
12. Safety check: Close gas stop cock for 20 – 45 seconds. The safety pilot should audibly close after the gas stop cock
has been closed.
13. Replace cover plate (15).
7.2
Volumetrische Methode
14 Pressure regulator
17 Pressure adjusting screw
20 Temperature control button
21 Measure nozzle for die pressure
22 Button for piezo spark ignition
22a Piezo spark ignition
23 Marking for ignition setting
24 Marking for OFF position
25 Cover cap
26 Marking for temperature control button
29 Gas connection flange ½“
30 Measure nozzle for connection pressure
31 Thermal power line
32 Gas supply from main burner
33 Ignition gas line
34 Ignition cable
36 Capillary tube for temperature sensor
24
26
22
23
25
20
17
14
22
22a
21
30
34
33
36
32
31
20
29
