2.4 Safety / Monitoring equipment
2.4.1 Safety devices
High-pressure switch (HP) (33)
The high-pressure switch is for protecting the coolant circuit against
exceeding the maximum admissible operating pressure.
In case of fault, the pressure switch (HP) switches off the cooling machine
and indicates the fault messages at fault alarm.
(see also Section 11.1 - Fault/Trouble shooting)
The cooling machine may be switched on again only after the pressure has
been reduced to the preset pressure and after using the outside positioned
reset button.
2.4.2 Monitoring device
Float switch
The float switches provided in tank (55) are for monitoring the water filling
level. A minimum admissible filling level, which must by no means be
allowed to fall further, guarantees a constant water discharge temperature.
If the water level continues to fall and reaches the minimum limit value, the
cooling machine and the pump will be switched off (dry run protection).
(see also Section 11.1 - Fault/Trouble shooting).
The float switch is mounted into the tank and it is accessible from the service
side.
Level indicator
The level indicators provided with MIN and MAX markings show the water
filling level inside the tanks. The level indicators are provided on the service
side of the cooler are clearly visible from outside the tank.
Motor protective switch – compressor and pump
In case of increased motor current and/or short circuit, the protective motor
switch is released, and the power supply is interrupted. The fault is
displayed at the control panel (see also Section 11.1 - Fault/Trouble shooting
and Electrical diagram). After the fault has been eliminated, the protective
motor switch shall be switched on manually.
The protective motor switch is provided inside the switch cabinet.
Temperature controller
The temperature controller controls automatically the water and refrigerant
circuits. At the temperature controller the water temperature as well as
warnings and faults are displayed. The controller is integrated at the
cabinet door.
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