KAESER SK 22, Operating Manual

Page: 44 / 132

4.5.3 Option W1
Prepared for external heat recovery
The cooling oil circuit includes 2 valves regulating the cooling oil temperature:
■ Thermostatic valve, machine
■ Thermostatic valve, heat recovery system
The thermostatic valves ensure that the cooling oil is kept at the ideal temperature for machine op‐
eration.
The thermostatic valve of the heat recovery system opens first so that surplus heat is released into
the heat recovery system. If the heat recovery system cannot carry away enough heat, the thermo‐
static valve of the machine opens to allow hot oil through the oil cooler circuit.
Condition:
Opening temperature machine thermostatic valve = Opening temperature heat recovery ther‐
mostatic valve
The heat available for recovery depends on the individual operating conditions of the machine.
Connections are provided for an external system to recover surplus heat.
The thermostatic valve of the heat recovery system does not function when the machine is deliv‐
ered. The necessary working element must be installed when installing the heat recovery system.
If necessary, the operating element in the machine's thermostatic valve can be exchanged for one
with a 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 proper functioning of the
cooling and heat recovery systems.
4 Design and Function
4.5 Options
34
Operating Manual Rotary screw compressor
SK
901848 21 E