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118 Cooling and heating
Mechanical installation
Connecting the internal cooling circuit to a customer cooling unit
￭
The converter delivery does not include the liquid cooling unit that is to be connected to the
converter cabinet.
Connecting the liquid pipes
Note: It is recommended to use closing valves in the pipe connections of the cooling circuit.
1.
Ensure that there is sufficient space and free access to make proper cooling pipe
connections between the liquid cooling unit and the converter. It is not allowed to use
inflexible and fixed cooling pipe connections between two separate units (eg, liquid
cooling unit and the converter connection). Always use a flexible connector that can
reduce possible stress caused by eg, vibration.
2.
Check visually that the converter liquid pipes are not damaged (threads and flange joint
not damaged).
3.
Connect the external cooling circuit directly to the coupling pipes on the side of the
converter. Lay liquid piping with extreme care. Secure the pipes properly mechanically
and check for leaks. See the technical data for the pipe materials.
4.
Position the liquid pipe ends against each other.
5.
Centre the connector onto the pipe ends.
6.
Tighten the
•
threaded connector carefully and ensure that it is slid on the pipe ends. The use
of appropriate sealant is recommended.
•
flange bolts to a minimum torque of 70 N·m (52 lbf·ft).
7.
Make sure that the liquid pipes are securely connected.
Filling up and bleeding the internal cooling circuit
Both the converter and coolant must be at room temperature before filling in the cooling
circuit.
WARNING!
Obey these instructions. If you ignore them, injury or death, or damage to the
equipment can occur.
•
Use protective eyewear when working with the liquid cooling system.
•
Make sure that the maximum permissible operating pressure is not exceeded.
When necessary control the pressure to appropriate level by draining excess
coolant out of the system.
•
Do not drain propylene glycol into the sewer system.
•
Be careful when you bleed the cooling circuit. Air bubbles in the circuit may
reduce or completely block coolant flow and cause overheating. Fill up and
bleed the pumps in the cooling circuit carefully as they can get damaged when
run dry. Obey the instructions of the external cooling unit.
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