Water Connections - Carrier Aqua SNAP PLUS 30AW Manual De Instalación

Water connections

Hydronic module
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
their various configurations.
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.
Water connections
Make the plate heat exchanger hydraulic connections
with the necessary components, using material which will
guarantee that the screwed joints are leakproof.
The figures 12 and 13 show a typical water circuit
installation.
For an application with a water circuit, the following
recommendations must be taken into account:
1. The external circulation pump must be installed in the
return water pipe work immediately before the heat
pump (unit without hydraulic 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 butterfly valves) should
produce a minimum pressure drop when they are open.
3. Provide unit and system drains 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 external 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
inlet with an extractable mesh filter. The filter mesh
gauge must be at least 10 mesh/cm
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, 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.
6 30AWH
Water connections 30AWH___H (Fig. 9)
1
2
3
30AWH__H integrated water circuit (Fig. 10)
1
2
3
4
5
6
7
30AWH__X integrated water circuit (Fig. 11)
1
2
3
4
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:
-
-
-
-
-
-
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 flow rate (l/s)
B - Available static pressure (kPa)
.
2
Fig. 15
A - Water flow rate, (l/s)
B - Pressure drop (kPa)
Anti-freeze protection
If unit is switched off during the winter period when
outdoor air temperatures below 0°C can occur and ethylene
glycol is not used, it is recommended that the entire system
is drained through the drain unit valve, Fig 9, item 3, and the
system drain, Fig 12/13, item 5.
Entering water pipe
Leaving water pipe
Draining water pipe
automatic purge valve
flow switch
safety valve (outlet 1/2')
temperature probe
circulation pump
plug to unblock the seizing pump
expansion vessel
automatic valve with air vent
flow switch
safety valve (outlet 1/2')
temperature probe
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
(Fig. 9/10/11)
(Fig. 14/15)