FRIGOMAR ENG - CU50VFD-CU70VFD 20190108.doc81218 Page 19 of 24
4.4.2 Chiller operation logic:
Compressor frequency from min (20Hz) to
maximum value.
Compressor frequency with proportional
regulation based on the delta
temperature:
Cooling: delta = Tfwo-INP8 to compare to
proportional band INP10;
Heating: delta = INP9-Tfwo to compare to
proportional band INP11.
When unit switch between cooling and
heating mode, compressor must stop for 3
minutes (if in former mode compressor
has started to run), fresh water pump
keeping running and sea water pump
start to run before compressor.
5.0 WORKING LIMITS
The unit operates correctly within the following ranges:
Summer cooling mode:
15°C < sea water temperature < 40°C
Winter heating mode:
5°C < sea water temperature < 20°C
Should working conditions be out of these ranges, in your particular application, please contact
Frigomar before installation in order to find a suitable solution.
Localized situations:
in some regions, it is common to experience a tremendous
presence of jellyfish or seaweed concentrated in back bay marinas for some periods
of time. This can clog strainers, water pumps and heat exchangers in a little while,
causing shut-down faults and sometimes equipment damage. In such particular
conditions, please seek the advice of a local Frigomar service representative. Any
possible modification to the overall system (chiller, pumps, strainers, etc) that could
overtake the problem must be approved by Frigomar, otherwise warranty coverage
will decline.
The pump is not self-priming:
any damage incurred due to a pump running dry is not
covered under warranty. Air conditioning system must be switched off, as well as
pumps, whenever there is a risk of pump unpriming, due to particular seawater
conditions related to the boat type and its speed. The compressor could be
damaged if the seawater flow through the heat exchanger is considerably reduced.
This air conditioning system is designed to work under normal operation conditions.
Where failure or malfunctions could lead to an abnormal operating condition that
could cause injury or damage to any equipment or other property, additional
precautions must be designed into the control system. Other devices (limit or safety
control) or systems intended to warn of, or protect against failure or malfunction, must
be incorporated into and maintained as part of the system.
