AERMEC Multichiller, Manual

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Prg
Esc
Prg
Esc
Prg
Esc
Prg
Esc
Richiesta / Limite
Ingresso analogico
Ingresso analogico
massimo Ingresso analogico
minimo
High
Low
Rotation
Chiller rotation : Rotation can be
Fixed 1 to 9 : fixed from chiller 1 (always ON) to chiller 9 (the last to
switch-on, the first to switch-off)
By work hours: on the basis of the working hours of the compressors.
The chiller with the compressor that has most working hours is the last
to start-up and the first to switch-off. The chiller that has the compressor
with least working hours is the fist to start-up and the last to switch-off.
The hours of the individual compressors of each chiller divided by 10
are considered (a difference less than 10 hours is not considered).
A chiller with at least 2 circuits, of which 1 is in alarm, is considered
the last to start-up and the first to switch-off
Standby chiller
It is possible to select a chiller that must only switch-on in the case of
unavailability due to anomaly of any other chiller present in the plant
and obviously requested.
Any chiller can be present from 1 to 9.
Replace any chillers that have all circuits in alarm. It is switched on last
and switched-off first even with respect to other chillers with circuits
partially in alarm.
Multifunction inputs
There are 3 analogue inputs present by means of which it is possible
to carry out 4 types of function. The analogue signals available are
in current 0-20mA input B1
in voltage 0 -5 volt input B2
NTC 10kohm temperature probe of the same type used on chillers B3
input
The type of input can be selected from the Input Selection parameter.
Use the Function Selection parameter to select the desired function:
NONE
Set point = set cold or hot, the hot or cold set point is obtained from
analogue input
Comp. Set point = hot cold set point compensation, algebraically
adds the value obtained to the set point
Limit = limits the max. number of chillers that can be switched-on
Demand = request for number of chillers switched-on. The Multichiller
no longer controls the number of chillers on the basis of the probes.
The function must be enabled from
the digital input ID4: closed contact =
multifunction enabled.