Minimum Chilled Water Loop Volume; Maximum Water Loop Volume (Evaporator And Condenser Side); Minimum Hot Water Loop Volume - Carrier Aquasnap 30RW Installation, Operation And Maintenance Instructions

5.9 - Minimum chilled water loop volume

Whichever the system, the water loop minimum capacity is
given by the formula:
Capacity = Cap (kW) x N Liters
Where Cap is the nominal system cooling capacity (kW) at
the nominal operating conditions of the installation.
This volume is necessary for stable operation and accurate
temperature control.
Application
Air conditioning
30RW/30RWA 020-045
30RW/30RWA 060-300
Industrial process applications
Certain industrial processes may require high leaving water
stability. In these cases the values above must be increased.
It may be necessary to add a buffer water tank to the circuit
in order to achieve the required volume. The tank must
itself be internally baffled in order to ensure proper mixing
of the liquid (water or brine). Refer to the examples below.
Bad
Bad
N
3.5
2.5
Good
Good
5.10 - Maximum water loop volume (evaporator and
condenser side)
Units with hydronic module incorporate an expansion tank
sized for the maximum water loop volume.
The table below gives the maximum water loop volume (in
litres) for pure water or ethylene glycol with various con-
centrations.
30RW/RWA 020-045
Pure water 673
10% ethylene glycol 487
20% ethylene glycol 358
35% ethylene glycol 290

5.11 - Minimum hot water loop volume

The condenser water loop volume has no impact on the
chiller operation. For heat pump operation (unit control
based on the hot-water temperature) the minimum
condenser water loop volume must be calculated in
accordance with the method used for the evaporator loop,
replacing the cooling capacity with the heating capacity.
060-080 090-150 160-210 245-300
1000 2080 2900 4162
730 1525 2135 3053
540 1120 1570 2236
430 910 1260 1800
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