Blue Box KAPPA V SR, Installation, Operating And Maintenance Manual

Page: 52 / 82

Blue Box 46
quantities to eliminate the risk of freezing, the lower limit is extended to a minimum of -5 °C leaving water
temperature.
5.2.18 Operation leaving water temperature control (option)
With leaving chilled water temperature control the reference sensor must be installed on the evaporator outlet or,
if there is more than one evaporator, on the common outlet pipeline downstream from the relative manifold.
The unit’s capacity steps are activated / deactivated with delay intervals in relation to a dead zone. When the
leaving water temperature is higher than the programmed set-point compressors start is enabled.
5.3 STARTING THE UNIT
For the start-up procedure refer also to the microprocessor controller manual.
- Close the external enabling contacts
- Press the "ON" button on the microprocessor controller
- If all the controls are enabled the display will show the message "UNIT ON"
After having performed the above procedures the unit will start automatically after a delay of approximately 5
minutes, assuming that the enabling signals of the microprocessor, the flow switches, and the water pumps
continue to be present.
If the unit fails to start: do not change internal electrical connections on
penalty of immediate invalidation of the warranty.
Important: on heat pump versions the operating cycle must be reversed
at the start and end of the season. Frequent switching from summer to
winter mode, and vice versa, should be avoided at all costs because it
can lead to malfunctions and subsequent breakdown of the compressors.
During idle periods do not disconnect the unit from the power supply (the
compressor crankcase heaters must remain switched on in these intervals).
Disconnect the unit from the power supply only in the event of prolonged
disuse (e.g. seasonal shutdowns). For temporary shutdown of the unit
refer to the guide lines given in paragraph 5.6.