Performance Tests; Low-Level Limiter; High-Level Limiter; Water Level Controller - Gestra NRS 1-9 Betriebsanleitung

Performance Tests

Lowlevel limiter
. Check length of electrode tip (see installation instructions for NRG 6-6).
. When switching on the mains voltage the green LED 6 should light permanently, fig. 6.
. Completely open valves of water-level gauge glass on steam boiler.
4. Fill boiler with feedwater ( cm above required min. level).
5. Decrease level in boiler until the level falls below min. level. After the response delay the two red
LEDs 3 must light up.
6. A low-level alarm can be simulated by pushing the button "TEST I" 4 whilst the electrode tip
is submerged. Push the button until the response delay has expired. Both red LEDs 3 must
light up.
7. To check the function of the checking circuitry of the switching controller proceed as follows:
Operate switch "TEST II / INSPECTION" 2 in the direction of the arrow with the electrode tip
submerged. After max. two minutes the two red LEDs 3 should signal low-level alarm.
The button "TEST I" 4 must not be operated during this test nor must the level fall below the low
level mark.
After the test return switch into its original position. After the response delay the two red LEDs 3
must extinguish.
Highlevel limiter
. Check length of electrode tip (see installation instructions for NRG 6-6).
. Completely open valves of water-level gauge glass on steam boiler.
. Fill boiler with feedwater until the level exceeds the required max. level.
After the response delay of  sec. the red LED 1 must light up, fig. 6.
4. Decrease level in the boiler until the level falls below high level, the red LED 1 must extinguish.

Water level controller

. Check length of electrode tips (see installation instructions for NRG 6-6).
. Lower water level in boiler until electrode tip "" (lower switch point) is completely exposed, fig. 10.
. The green Led 5 must light up, fig. 6.
Simultaneously the switching function for feedwater control (PUMP ON) is released.
4. When the water level reaches electrode tip "" (upper switch point), LED 5 must extinguish.
Simultaneously the switching function for feedwater control (PUMP OFF) is released.
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