30
NRGS 15-1 - USA - Installation & Operating Manual -
850690-00
Attention
■
The following cables with basic insulation must not be relocated:
mains and control cables in the extra-low voltage range.
■
Provide an external slow blow 2.5 A fuse to prevent the output contacts from
welding together.
■
Switching off inductive loads produces surges that can have a major adverse
effect on open and closed-loop control systems. Connected inductive loads must
therefore have interference suppression (RC combination) as per the manufac-
turer's specifications.
■
Provide the level switch with an external slow blow 63 mA fuse
for 240 V, and a slow blow 120 mA fuse for 120 V.
■
To enable isolation of the level switch, install a disconnector near the
equipment in an easily accessible location.
■
Mark the disconnector as an isolating device for the level switch.
Electrical connection
Bringing into service
1. Switch on the mains supply. The green LED
5
Power ON lights up.
LEDs
1
,
2
3
,
4
Fig. 4
light up depending on the water level.
1. Check switchpoints and functions by filling the tank and by draining some water, as appropri-
ate. See the
Checking switchpoints and functions
table on pages 31 and 32.
1. Check that the level switch is connected according to the wiring diagram.
Fig. 12
2. Check that the supply voltage matches the data on the rating plate.
Checking the electrical connection
Switching on the supply voltage
Checking switchpoints and functions
When bringing into service, switch the water level control system to manual mode.
Only fill or drain the steam boiler or tank in manual mode.
Danger
