Changing The Cooling Liquid; Replacing The V-Belt; Controller - Grundfos Fire NKF Montage- Und Betriebsanleitung

3. Tighten the connector.
4. Repeat steps 1 to 3 for all injection nozzles.
5. Start the engine by pressing button S1 on the control panel
and check for leaks. Then press button S3 to switch the
engine off again.

9.6 Changing the cooling liquid

Over time, the coolant in the cooling liquid loses its effect.
The cooling liquid must therefore be changed every year.
A ready-made cooling liquid consisting of a mixture of 50 %
coolant and 50 % water should be used. For filling quantities,
see section 4.4.3 Engine.
Warning
Do not open cap of equalisation tank or heat
exchanger when the engine is warm. Tank is
under pressure! Danger of burns from escaping
liquid!
1. To drain the cooling liquid, open the drain tap (fig. 36, pos.
23). Collect the cooling liquid in a suitable container and
dispose of it in an environmentally sound way.
2. Close the drain tap.
3. Unscrew the cap of the heat exchanger (fig. 28, pos. A) and fill
with cooling liquid up to the bottom end of the filling port.
Close the cap of the heat exchanger. Then remove the cap of
the equalisation vessel (fig. 28, pos. B) and fill it with cooling
liquid up to a level of 100 mm measured from the bottom.
Close the cap of the equalisation vessel.
4. Press button S1 on the control panel to start the engine and let
it run at zero load until it reaches a temperature of 71 to 93 °C.
Then press button S3 to switch the engine off again.
5. When the engine has cooled down, check the level of cooling
liquid and, if necessary, fill cooling liquid into the heat
exchanger up to the lower end of the filling port (JU4H and
JU6H) or to the maximum mark (JW6H).
Only use prescribed coolant.
Caution
See section 4.4.3 Engine.
Fig. 36 Draining tap for cooling liquid
22

9.7 Replacing the V-belt

The V-belt must be replaced once a year.
Fig. 37 V-belt
1. Remove the protective cover (fig. 6 or fig. 8, pos. 17).
2. Loosen the adjusting nuts on the generator (fig. 37, pos. A).
3. Push generator inwards (fig. 37, pos. B) and remove old
V-belt.
4. Install new V-belt. Push generator outwards until the correct
V-belt tension is reached. The elasticity at the arrow must be
between 1 and 1.5 cm.
5. Retighten the adjusting nuts on the generator.
6. Refit the protective cover.

9.8 Controller

The following maintenance work must be carried out regularly:
Test indicator lights:
Check wire connections: Once a year.
To test the function of the indicator lights, press the button S5
"Indicator light test". If an indicator light fails, please contact
Grundfos.
All screw connections on the brackets and all frame connections
must be checked once a year to ensure a secure fit. Any loose
connections must be tightened. Check the cables for visible
damage and replace, if necessary.
23
Once a week.
A
B