Carrier 61AF-series Installations-, Betriebs- Und Wartungsanweisungen Seite 9

61 AF
Water connections
Typical water circuit diagram for units with hydronic module
2. line filter for water (10 mesh/cm2)
3. pressure gauges
4. filling valve
5. system drain valve (at the lowest points of the circuit)
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 recommendations
must be taken into account.
1. The pump must be fitted immediately before of the heat exchanger
and after the connection to the system return (unit without hydronic
module).
most important circuit components, as well as the heat exchanger
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 upstream
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. The presence of particles in the water can lead to obstructions in
the heat exchanger.
It is therefore necessary to protect the heat exchanger inlet with
an extractable mesh filter. The filter mesh gauge must be at least
2
10 mesh/cm .
The equipment standard version with hydronic module is
equipped with mesh filter, included in the supply and installed.
2. 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.
3. Pump flow rate control is made through a flow control valve
supplied with the unit with hydronic module, which must be
installed on the delivery pipe during installation.
3
10
1
3
1
2
6
4
5
6. air flushing valve (in the highest parts of the circuit)
7. 3-way valve
8. sanitary water accumulation tank
9. inside system
10. expansion vessel
4. When water has to reach temperatures below 5°C, or the
equipment is installed in areas subject to temperatures below 0°C,
it is necessary to mix water with glycol in suitable quantity.
The maximum allowable quantity of ethylene and propylene glycol
is 40 % (higher concentrations depend on the mix viscosity and the
operating conditions address to Carrier for further details).
Frost protection
The plate heat exchanger and the water connections of the hydronic
module pump may be damaged in spite of the anti-freeze protection
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 exchanger
and to the internal circuit of the hydronic module must never be
interrupted.
E N G L I S H
9
7
8
GB - 7