Carrier 30RB Series Manual page 8

30RB/30RQ
Water connections
Typical water circuit diagram for units with hydronic module
Legend for units without hydronic
module:
1 30RB - RQ unit without hydronic
module
2 fan coil units
4 pressure gauges
5 manual shut-off valves
6 pressure couplings
7 thermometers
10 plate-type heat exchanger drain
valve
11 charge valve
12 fl exible coupling
13 shut-off valve with
incorporated stop
14 pressure reducer
15 hydraulic circuit drain valve
16 fl ow control valve *
* Factory-supplied, fi t during
installation
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 fi tted immediately before of the heat exchanger
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 exchanger itself.
These valves (ball, globe or butterfl y 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. A fl ow switch should be installed in a straight horizontal stretch with
a length of at least fi ve times the line diameter on either side.
The fl ow 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 protection
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.
It is therefore necessary to protect the heat exchanger inlet with an
extractable mesh fi lter. The fi lter mesh gauge must be at least 10
mesh/cm 2 .
The equipment standard version with hydronic module is equipped
GB - 8
2
7
4
5
6
12
11
15
10
Power supply
with mesh fi lter, included in the supply and installed.
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 fi lters.
4. Pump fl ow rate control is made through a fl ow control valve supplied
with the unit with hydronic module, which must be installed on the
delivery pipe during installation.
5. 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.
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 fi tted 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.
IMPORTANT:
Both the appliance main switch (1Q) and the auxiliary protection
switch for the electric heaters (1QF) must always be in the closed
position (the positions of 1Q and 1QF are indicated in the wiring
diagram).
NOTE:
If the automatic fi ll kit option is used on
the unit, fi tting an extra charging
valve is unnecessary.
16
13 14
Automatic fi ll kit option
1