Recommended Water Diagram (Fig. 11/12); Electronic Control - Carrier Aquasnap 30RB Manual De Instalación

% Inhibited Ethylene Glycol
Freezing temperature
Correction Capacity
factors
Absorbed power
Loss of head
(*) Note: Temperature values are indicative.
Always refer to the temperatures indicated for the specific product used
tABle to use for CAlCulAtiNg the WAter CoNteNt
In THe SySTeM
Installed Unit
Unit content (*)
Pipe content (**)
Uses (fan-coil, panels, radiators, etc.) (***)
Total content (****)
(*) Consult the technical data table.
(**) Consult the pipe water content table.
(***) Consult the manual for the installed uses.
(****) The water content of the system must be between the minimum and
maximum values for the units with hydronic kit and greater than the minimum
value for units without hydronic kit. The minimum value is necessary to provide
optimal comfort.
For units without hydronic kit, add a suitable expansion
vessel to the water content of the system. The water
content is necessary to ensure the stability of plant
operation and accurate temperature control. It is often
necessary to add a buffer water tank to the circuit in order
to achieve the required volume.
7.2.3 - Circuit water content
Whatever the size of the system, the minimum content of
the water circuit is given by the following formula:
Content = CAP(kW) x 3.5 = Litres
where CAP is the nominal system capacity (kW) at
nominal operating conditions of the installation.
For industrial process cooling applications, where high
stability of water temperature levels must be achieved, the
values above must be increased. We recommend consulting
the factory for these particular applications.

7.3 - recommended water diagram (fig. 11/12)

Typical water circuit diagram for unit 30RB___X9 without
integrated water pump (see fig. 11).
Typical water circuit diagram for unit 30RB___-9 with
integrated water pump (see fig. 12).
20
10% 20% 30% 40%
−4 °C −9 °C −15 °C −23 °C
0.990 0.980 0.960 0.940
0.995 0.992 0.988 0.983
1.07 1.20 1.35 1.53
.............
l .............
l .............
l .............
l .............

8 - elecTronIc conTrol

Operation and control of all units is carried out via the
electronic control. The instructions supplied with the
control include comprehensive descriptions.
PRO-Dialog + electronic control
PRO-DIALOG + is an advanced numeric control system
that combines complex intelligence with great operating
simplicity.
PRO-DIALOG + constantly monitors all machine
parameters and safety devices, and precisely manages the
operation of compressor and fans for optimum energy
eficiency.It also controls the operation of the water pump.
A powerful control system
The PID control algorithm with permanent compensation
for the diference between entering and leaving water
temperature and anticipation of load variations regulates
compressor operation for intelligent leaving water
temperature control.
To optimise power absorption, the PRODIALOG +
automatically re-calibrates the set point of the entering
water temperature based on the outside air temperature to
one of the two pre-set values (occupied building and ofan
unoccupied building for example).
PRO-DIALOG + control is auto-adaptive for full
compressor protection.
The system permanently optimises compressor run times
according to the application characteristics (water loop
inertia), preventing excessive cycling.
In most comfort air conditioning applications this feature
makes a buffer tank unnecessary.
Extended communications capabilities
PRO-DIALOG + allows remote control and monitoring
of the unit through a wired connection: 7-8 x 0.5 mm2
multiple cables. The cable should be screened of the
FROH2R or BELTEN 9842 type. The screening should be
grounded only on the electric unit panel board.
Functions available are start/stop, power demand limit or
dual set-point and customer safety lock.
The system permits remote signalling of any general
anomaly for each refrigerant circuit.