Sizing Principles; Heat Sink Connection; Figure 4: Hydraulic Connection Of The Heat Pump; Figure 5: Flow Rate Measurement Wna - Carrier AquaSnap 61CG-A Installation, Operation And Maintenance Instructions

5 - HYDRAULIC CONNECTION

5.5 - Sizing principles

Observe the following sizing principles.
The flow velocity in the pipework should not exceed
1,0 m/s (noise/ pressure drop).
For convenient, fault-free operation, ensure a temperature
differential of 5 K between the heating flow and return lines (heat
sink system).

Figure 4: Hydraulic connection of the heat pump

Outlet
inlet
Heating
Cooling
112,5 363
When sizing the heat circuit pump/buffer charging
pump, the internal pressure differential of the heat
pump condenser must be taken into account (see
technical data)
Failure to observe this poses the risk that the heat pump will not
reach the specified outputs and may, under certain circumstances,
be switched off via the high pressure switch → ERROR message
(see controller operating manual).
We recommend installing the heat pump with a buffer tank or a
low loss header. A (manual) air vent valve must be fitted at the
highest point in the pipework.
Ensure that no foreign bodies can get into the pipework (dust, dirt,
etc.). A strainer can be installed in the heat pump return line to
catch dirt. Ensure that the guard is easy to clean for maintenance
purposes.
A clogged strainer significantly impairs heat transfer and can cause
a high pressure safety shutdown! Install valves and thermometers
in the flow and return lines to allow continuous monitoring of the
water flow rate and the heat pump operating state. At the lowest
point in the pipework, fit a drain pipe to allow the system to be
drained.
Size the heating pipework according to the technical data for
the heat pump.

5.6 - Heat sink connection

5.6.1 - Nominal flow rates (WNA)
The nominal flow rates for the heat sink system (WNA) should be
determined.
Different flow rates can lead to a reduction in the efficiency of the
heat pump.
5.6.2 - Flow rate measurement WNA
The flow sensor on the heat sink side must be installed by the
system installer according to CARRIER installation guidelines.
If the flow sensor is poorly installed, CARRIER will not commission
the system.
inlet
CARRIER does not accept liability for possible damage if a flow
sensor is not installed or is inadequately fitted, sized or wired.
Outlet
Source
Brine/Water
The nominal flow rate (see technical data) must be ensured in
each operating mode (DHW charging, heating, cooling mode via
separate cooling buffer tanks, etc.). The flow rate is measured via
an optional flow sensor and shown on the controller controller
display. To enable hydronic balancing according to the relevant
standards, in particular in combined heating/cooling mode, install
the appropriate circuit balancing valves and balance the system
accordingly. If no optional flow sensor is installed, the flow rate
must be ensured on site.

Figure 5: Flow rate measurement WNA

54
+24 VDC
SW
bl
br
min. 5 x DN
11