KKT chillers nBoxX 1.5, Operating Instruction, Page: 17 / 48

17 / 48 83000902.Ka
Fig. 10 Assignment of PLC contacts
6 6 6 6 Commissioning Commissioning Commissioning Commissioning
The cooling unit does not have its own main switch to switch the cooling unit on and off. It must be
switched on and off by the higher-level controller.
6.1 6.1 6.1 6.1 Antifreeze Antifreeze Antifreeze Antifreeze
As standard, the units are not suitable for operation below the specified minimum temperature (see
chapter 11). The units are always to be used with a water-glycol mixture for the coolant with a maxi-
mum glycol content of between 20 and 30% by volume. The recommended antifreeze is Antifrogen
N. Other types of antifreeze are possible in specific cases, however only in consultation with the
manufacturer.
Note! Note! Note! Note!
Only use distilled or de Only use distilled or de Only use distilled or de Only use distilled or de----ionised water in cooling units specified for such use ionised water in cooling units specified for such use ionised water in cooling units specified for such use ionised water in cooling units specified for such use
Caution! Caution! Caution! Caution!
Risk of damage for pipes and seals! Risk of damage for pipes and seals! Risk of damage for pipes and seals! Risk of damage for pipes and seals!
Other additives may damage the pipes Other additives may damage the pipes Other additives may damage the pipes Other additives may damage the pipes and the seal on the cooling medium pump and the seal on the cooling medium pump and the seal on the cooling medium pump and the seal on the cooling medium pump
and are therefore not allowed.
and are therefore not allowed. and are therefore not allowed.
and are therefore not allowed.
6.2 6.2 6.2 6.2 Filling the cooling system with cooling medium Filling the cooling system with cooling medium Filling the cooling system with cooling medium Filling the cooling system with cooling medium
For commissioning, proceed as follows:
Ensure that any shut-off valves installed in the cooling medium circuit are open.
Fill the unit with cooling medium via the fill nozzle (1 1 1 1) up to the full mark in the tank.
Switch on the power supply to the cooling unit via the higher-level controller. The indicators on the
controller illuminate and indicate the actual feed temperature of the cooling medium.
Check the direction of rotation of the motors (see direction of rotation arrows on the cooling medium
pump and on the condenser fan)
If necessary, lower the set-point temperature momentarily
Note! Note! Note! Note!
If the compressor and condenser fan do not start to operate, the temperature of the
cooling medium added is lower than the set-point temperature set.