Carrier AQUASNAP 30RA 017 Instrucciones De Instalación, Funcionamiento Y Mantenimiento página 9

30RA/30RH
Water connections
Ethylene glycol curve
Make the plate heat exchanger hydraulic connections with the
necessary components, using material which will guarantee that the
screwed joints are leakproof.
The typical hydraulic circuit diagram shows a typical water circuit
installation in an air conditioning system.
For an application with a water circuit, the following recommenda-
tions must be taken into account:
1. The pump must be fitted immediately before of the heat exchan-
ger and after the connection to the system return (unit without
hydronic module).
2. It is advisable to install shut-off valves to allow isolation of the
most important circuit components, as well as the heat exchan-
ger itself.
These valves (ball, globe or butterfly valves) should produce a
minimum loss of charge when they are open.
3. Provide unit and system drains and vents at the lowest system
point.
4. Install purges in the higher sections of the installation.
5. Pressure ports and pressure gauges should be installed upstre-
am and downstream of the water pump (unit without hydronic
module).
6. Thermometers should be installed in the unit water inlet and
outlet.
7. All piping must be adequately insulated and supported.
Installation of the following components is obligatory:
1. A flow switch should be installed in a straight horizontal stretch
with a length of at least five times the line diameter on either
side.
The flow switch must be positioned in the exchanger inlet pipe.
It must be electrically connected in accordance with the wiring
diagram (only unit without hydronic module).
If this is not possible, the installation should incorporate a protec-
tion device which is activated when there is no water circulating
in the heat exchanger.
2. The presence of particles in the water can lead to obstructions in
the heat exchanger.
Weight concentration of ethylene glycol in water %
It is therefore necessary to protect the heat exchanger inlet with
an extractable mesh filter.
The filter mesh gauge must be at least 10 mesh/cm
The standard supply of the unit with hydronic module includes a
mesh filter to be fitted during installation.
3. After assembling the system, or repairing the circuit, the whole
system must be thoroughly cleaned with special attention paid to
the state of the filters.
4. Pump flow rate control is made through a flow control valve sup-
plied with the unit with hydronic module, which must be installed
on the delivery pipe during installation.
5. In case of water refrigeration at temperatures lower than 5°C, or if
the unit is installed in areas where temperatures drop below 0°C,
water must be mixed with a proper quantity of ethylene glycol
(see the curve above).
Use the curve to determine the correct ethylene glycol concentra-
tion for the temperature.
Frost protection
The plate heat exchanger and the water connections of the hydron-
ic module pump may be damaged in spite of the anti-freeze protec-
tion system these units are fitted with.
Frost protection of the plate heat exchanger and of the circuit inside
the hydronic module is always guaranteed down to -10°C by the
electric heaters that are automatically activated if needed.
The power supply to the electric heaters of the plate heat exchang-
er and to the internal circuit of the hydronic module must never be
interrupted.
IMPORTANT:
Both the appliance main switch (Q1) and the auxiliary protec-
tion switch for the electric heaters (QF101) must always be in
the closed position (the positions of Q1 and QF101 are indi-
cated in the wiring diagram).
E N G L I S H
ATTENTION:
The pump leakproof com-
ponents are not suitable for
use with propylene glycol.
CAUTION:
Using water with glycol may make
it necessary to change the con-
figuration of the control system.
.
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GB - 7