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134 Cooling and heating
13. Repeat steps 10...12 a few times until all air is let out of the cooling circuit. Listen for a
humming sound and/or feel the piping for vibration to find out if there is still air left in
the circuit.
Adjustments
•
Set the base pressure to 100...150 kPa by draining coolant from the fill/drain coupling.
•
Control the coolant temperature so that it stays between the limits stated in
Specifications
on page 136.
Draining the internal cooling circuit
You can drain the internal cooling circuit through the cooling unit as follows:
Note: Draining coolant into the sewer system is not allowed.
WARNING! High-pressure hot coolant may be present in the internal cooling
circuit. No work on the cooling circuit is allowed until the pressure is lowered down
by stopping the pumps and draining coolant.
1. Lead the bleed hose into a bucket or other suitable container. Extend the standard
hoses when necessary.
2. Open the bleed valve to let air displace the liquid.
3. If required, dry the piping with compressed oil-free air of less than 6 bar (600 kPa).
4. If the converter is to be stored in temperatures below 0 °C (32 °F),
•
dry the cooling circuit with air
•
fill the cooling circuit with a mixture of water and coolant according to section
Freeze protection and corrosion inhibition
•
drain the cooling circuit again.
Cooling station control
Instructions for liquid cooling control:
1. After the transportation package is opened
a. The converter must be stored in non-condensing environment.
2. During turbine installation - before converter hot-commissioning (no electrical running
performed yet). The converter must be protected against direct climate changes, such
as rain and sunlight (temperature cover).
a. Remove the temperature cover.
b. Visual inspection - no condensation water inside the converter can be found. The
converter doors must be closed after visual inspection.
c. Start cooling liquid circulation. Forced heating must be enabled in all conditions. Set
the cooling system target temperature to +45 °C...50 °C (+113 °F...122 °F). Enable
230 V AC supply to the converter.
d. Run the converter for a minimum of 24 hours.
3. After turbine installation - during converter hot-commissioning
a. Follow the product-specific start-up guide.
4. During normal operation
a. Cold start - heating request according to the converter heating demands.
on page
137
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