Adjusting Nominal Thermal Load At Single-Stage Operation - Schwank novoSchwank D 20S U Technical Manual

Adjusting nominal thermal load at
single-stage operation
Attention!
The burner kit is pre-adjusted on natural
gas / propane. Do not put the appliance
into operation uncontrolled.
Adjusting the nozzle pressure
1. Open first the gas cock which is at the end of
the flexible gas hose [Fig. 37].
2. Open the test nipple connection pressure.
Connect the pressure measuring instrument to
the test nipple and determine the connection
pressure.
Close the test nipple after the measurement!
3. Open the test nipple nozzle pressure.
Connect the pressure measuring instrument to
the test nipple and determine the nozzle
pressure.
4. Turn the adjusting screw on the pressure
regulator slowly in the "+" or "-" -direction while
continuously watching the pressure measuring
instrument. Stop turning as soon as the required
nozzle pressure is reached. The required test
nipple nozzle pressure for natural gas H
[W =14.85 kWh/m ] and natural gas L
3
o
[W =12.15 kWh/m ] is shown in Table 5. For
3
o
natural gas with other Wo-Index [information
from local gas company] you have to
determine the required nozzle pressure based
on the diagram on page 42.
5. Remove the protection cap A [Fig. 38]
6. Put the radiant tube into operation
7. Turn the adjusting screw B [Fig. 38] on the
pressure regulator slowly in the "+" or "-" -
direction while continuously watching the
pressure measuring instrument. Stop turning as
soon as the required nozzle pressure is reached.
8. Put the protection cap A on the valve after the
adjusting.
9. Close the test nipple after the measurement and
check if the test nipple is gas-tight.
Checking adjustment
1. Turn the adjustment screw slightly to "-"
-direction. Nozzle pressure must drop
immediately. If this does not happen, you must
readjust the jet pressure until the point is
reached at which a decrease or increase in the
nozzle pressure is noticeable on the measuring
instrument.
2. Close test nipple after the measurement!
3. Remove the measuring instrument and check if
the test nipple is gas-tight.
novoSchwank shape U
Fig. 37: Gas cock with integrated TSD
Fig. 38: modulating regulator with adjustment screws
39