22
NRGS 15-1 - USA - Installation & Operating Manual -
850690-00
Installation
DANGER
Danger to life from scalding caused by escaping hot steam.
Hot steam or water can escape suddenly if the level electrode is unscrewed under
pressure.
■
Reduce the boiler pressure to 0 psi (0 bar) and check the pressure before unscrewing
the level electrode.
■
Only remove the level electrode at 0 psi (0 bar) boiler pressure.
WARNING
The hot level electrode can cause severe burns.
The level electrode gets very hot during operation.
■
Always let the level electrode cool down before performing installation and mainte-
nance work.
■
Only remove level electrodes that have cooled down.
ATTENTION
Incorrect installation can lead to malfunctions in the plant or the level electrode.
■
Always install the level switch in a vertical position.
■
Take care not to bend electrode rods during installation!
■
Avoid subjecting electrode rods to hard impacts.
■
Ensure a minimum of 1.2 in (30 mm) for insulating the electrode rods.
■
Do
not
install the terminal box
A
or upper part of the level electrode cover tube
B
in
the boiler’s thermal insulation!
Fig. 2
■
Make sure that the boiler’s thermal insulation is no more than max.1.57 in (40 mm)
thick in the vicinity of the level switch (see
Fig. 3
).
■
Do not coat the electrode thread with conductive paste or grease!
■
Make sure there is a creepage path of at least 0.55 in (14 mm) between the electrode
tips and ground (flange, tank wall).
Figs. 8, 9, 10
■
Ensure minimum clearances when installing the electrode.
Note
■
Check the boiler standpipe and flange during the preliminary boiler inspection.
■
Installation examples can be found on page 26.
