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5.9
Venting
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Setting Up
In order to vent the cooling system, the control valve must be closed.
Note
If the control valve is open, chilling medium may flow from the return flow and into the
heat exchanger. Venting is not possible in this case.
The control valve is opened or closed by the electronic control system by way of an
electric actuator and based on the chilling medium demand.
When the cooling module is switched off by the control system, the actuator closes the
control valve. This process takes approximately 2 minutes.
If the operating voltage is disconnected before the actuator has closed the control valve,
the control valve must be closed manually.
Notice
Risk of damage to components!
There is a risk of damage if the actuator is manipulated while it is connected to the
operating voltage.
Do not adjust the actuator manually unless it is disconnected from the operating power
supply.
Prerequisite for venting:
•
The water installation is complete. The inflow to the cooling module is still closed.
•
The electrical installation is complete.
•
Specialised personnel with access to the water installation is present.
Note
If the system comprises several cooling units, vent the systems one after the other in
order to ensure sufficient pressure for pushing the air out.
VARISTAR Cooling unit SHX 30
41
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