KKT chillers nBoxX 1.5, Operating Instruction, Page: 38 / 48

38 / 48 83000902.Ka
9 9 9 9 Troubleshooting Troubleshooting Troubleshooting Troubleshooting
In operation, the cooling unit operates in a safe state. The cooling system maintains the cooling me-
dium feed temperature at the set the set point.
Possible causes for deviation from the set point could be:
•
Cooling demand too high, see chapter 11
•
Ambient temperature too high, see chapter 11
•
Failure to observe required distances, see chapter 5
•
Soiled evaporator
•
Soiled condenser
•
Lack of refrigerant
•
Level of cooling medium in tank too low (not with pressure-sealed units)
•
Cooling medium temperature set too low, see chapter 11
•
Parameters set incorrectly
Any malfunctions must only be rectified by suitably instructed, qualified personnel. For information
on malfunction analysis, refer to Tab. 3 Error codes or contact our service department.
10 10 10 10 Shutting down and disposal Shutting down and disposal Shutting down and disposal Shutting down and disposal
The cooling unit must only be shut down by authorised, qualified personnel. For this purpose the unit
must be decommissioned.
•
Electrically isolate the unit at the mains isolation device.
10.1 10.1 10.1 10.1 Shutting down for an extended period Shutting down for an extended period Shutting down for an extended period Shutting down for an extended period
If the cooling system will not be used for an extended period (more than 6 months) the cooling me-
dium circuit must be drained to prevent the evaporation of water and to prevent a change in the wa-
ter-glycol ratio in the cooling medium. If the glycol concentration increases, the pump seal may be
irreparably damaged.
•
Isolate the unit from the supply of power and secure it against switching back on.
•
Disconnect the cooling medium circuit connections.
•
Drain the cooling medium circuit, see chapter 8.
•
For disposal of the cooling medium, observe the applicable regulations on water pollution, in Ger-
many the Wasserhaushaltsgesetz (Federal Water Act).
•
To re-commission the cooling system, proceed as described in chapter 6. Make the same checks
as described in that chapter.