Carrier 30AWH012H - Water connections; Hydronic module; Water connections recommendations

6 30AWH
Water connections
Hydronic module (Fig. 10/11)
Water connections (Fig. 14/15)
The 30AWH__H units are equipped with an integrated
hydronic module that allows fast installation with the aid
of a few external components. The 30AWH__X units, on the
other hand, do not have a circulation pump and expansion
vessel. For this reason, they must be provided outside. In
any case, all the necessary protections and valves are to be
inserted in the water circuit inside the unit.
Refer to Figure 9 for the exact connection of the water
pipes.
Figures 10 and 11 describe the integrated components in
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Note: The correct dimensioning of the expansion vessel is
left to the installer as a function of the type of plant.
Note: The discharge of the safety valve can be channeled to
the outside of the machine using the pre-cut holes (see Fig.
4). In this case, it is necessary to provide a open drain funnel.
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1 automatic purge valve
2 ow switch
3 safety valve (outlet 1/2')
4 temperature probe
5 circulation pump
6 plug to unblock the seizing pump
7 expansion vessel
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1 automatic valve with air vent
2 ow switch
3 safety valve (outlet 1/2')
4 temperature probe
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:
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heat exchanger and after the connection to the system
return (unit without hydronic module).
2. It is advisable to install shut-o valves to allow isolation
of the most important circuit components, as well as the
heat exchanger itself.
These valves (ball, globe or buttery valves) should
produce a minimum loss of charge when they are open.
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system point.
4. Install purges in the higher sections of the installation.
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upstream and downstream of the water pump.
6. 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
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gauge must be at least 10 mesh/cm
2
.
2. After assembling the system, or repairing the circuit, the
whole system must be thoroughly cleaned with special
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valve, which must be installed on the delivery pipe
during installation.
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 inhibited
ethylene glycol in suitable quantity.
Anti-seizing pump
The 30AWH__H units are equipped with protection against
the seizing of the pump motor shaft. To allow this function,
do not empty the system or disconnect the power during
long periods of inactivity.
In any case, if the pump rotor shaft seizes after a long period
of inactivity, the user must do the following to unblock it:
- Disconnect the power
- Remove the front panel
- Unscrew the shaft-protection plug on the back of the
pump
- Insert a screwdriver in the slot and turn the rotor shaft
- Remount the protection plug
- Reconnect the power
System cleaning and Water Characteristics
In the case of a new installation, or cleaning the circuit, it
is necessary to perform a preventive cleaning of the system.
In order to guarantee the good operation of the product,
each time you clean the system, replace the water or add
glycol, check that the liquid appears clear, without visible
impurities and that the hardness is less than 20 °f.
Fig. 14
A - Water ow rate (l/s)
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Fig. 15
A - Water ow rate, (l/s)
B - 1SFTTVSFESPQL1B
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