Fig. 7 Water-cooling (option K2)
1 Oil cooler
2 Air cooler
3 Cooling water connection
4 Cooling water connection
4.4.4 Option W1/W2/W3
Heat recovery
The cooling oil circuit includes 2 valves that regulate the oil temperature.
■ Combination valve: oil temperature regulator for the oil cooler.
■ Thermostatic valve: oil temperature regulator for the heat recovery system.
The cooling oil is kept at the ideal temperature for machine operation.
The thermostatic valve opens first so that heat is given up to the heat recovery system. If the heat
recovery system cannot carry away enough heat, the combination valve opens to allow hot oil through
the oil cooler circuit.
Operation:
combination valve opening temperature = thermostatic valve opening temperature
The available heat to be recovered depends on the operating conditions of the machine.
Prepared for external heat recovery
Connections are provided for an external system to recover surplus heat.
The thermostatic valve does not function when the machine is delivered. The necessary working
element must be installed when installing the heat recovery system.
If necessary, the working element in the combination valve can be exchanged for one with higher
opening temperature. The opening temperature depends on operating and ambient conditions.
Working elements are marked with their opening temperature [°C].
If the cooling oil temperature is too low, condensate can form and damage the machine.
➤ Consult KAESER Service on components and layout to ensure a fully functioning cooling
and heat recovery system.
Internal heat recovery
A plate-type heat exchanger is installed for internal heat recovery.
The plate-type heat exchanger transfers heat from the cooling oil to a heat-receiving medium.
4 Design and Function
4.4 Options
28
Service Manual Screw Compressor
BSD 9_5708 08 USE
Option W1
Option W2/W3
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