Installation Instructions; Gas-Pipe-System And Mounting Of Heaters - Schwank novoSchwank D 20S U Technical Manual

10 Installation
instructions
Danger of fire and explosion!
Unprofessional handling of gas pipes,
gas connections and the appliance can
produce gas leaks. It is highly dangerous
if gas is ignited!
Working on gas pipes and the
appliances is only allowed by approved
installers.
Mount the flexible connection, so that it
can compensate the longitudinal
expansion of the tube.
Only use flexible connections for the
radiant tube regarding:
• gas
• electricity and
• air [if necessary]
a
b
Fig. 24: Longitudinal expansion
Gas-pipe-system and mounting of
heaters
Connection of gas pipes to the appliance, supply
and the mounting of the appliance is only allowed
by professional personnel who is registered, holding
a current certificate of competence and in
accordance with the relevant provisions of the gas
safety [installation and use] regulations.
Additional installation notices of national or local
institutions must be observed. The pipe must be
dimensioned in a way that the minimum
connection pressure in front of the gas
combination valve of the individual devices is
available at the nominal thermal load of the entire
system, according to Tab. 6.
novoSchwank shape U
Please consider the pressure drop of the upstream
mounted gas connection and gas filter. For the
detailed pressure drop value of the Schwank gas-
pipe-systems see Tab. 7.
Minimum connection pressures in front of valve
novoSchwank shape U
type
Natural
gas H*
20S U - 55S U
Natural
gas L* 20S U - 55S U
Propane 20S U - 55S U
* Natural gas H: Hi,n: 9.97 kWh/m
Tab. 6: min. connection pressures in front of gas combination
valve
Pressure drop Schwank gas-pipe-systems
novoSchwank shape U
Type
20S U – 35S
Natural
gas H
45S U – 55S
20S U – 35S
Natural
gas L
45S U – 55S
Propane 20S U – 35S
45S U – 55S
Tab. 7: Pressure drop Schwank gas-pipe-systems
The max. connection pressure is 60 hPa!
In case of contaminated gas pipes and
generally at gas pipes of welded black
steel have to be mounted gas filter-
groups directly in front of the heater.
[see page 51].
nozzle
min.
connec- start step
tion pressure
pressure
pressure
[hPa] [hPa]
15 10
20 15.2
40 37
3
Natural gas L: Hi,n: 8.57 kWh/m
Gas pipe
system Pressure drop
[hPa]
1/2" / L=800 mm
3/4" / L=800 mm
1/2" / L=800 mm
3/4" / L=800 mm 2.5
1/2" / L=800 mm
3/4" / L=800 mm
[hPa]
4 - 5
6 - 7
22
3
2
2
2
1
1
27