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Monobloc Outdoor Unit Installation Manual
7.6 Water charging
Fill the heating system with water until the system water pressure is 0.2MPa (2.0 bar g). Check all of the water
side connections to ensure that all connections are watertight and that there is no water leakage.
During the water filling air may be trapped in the heating system / pipework. Release all air trapped in the system
using the air purge valves (locally supplied) fitted to the system.
The hydraulic pressure may drop when the system test run begins. If the hydraulic pressure drops refill the
heating system until the water pressure is 0.2MPa (2.0 bar g).
7.7 Water flow rate control
If the installation flow rate is below the minimum flow rate, there is a risk of excessive fouling and of the system
stopping due to the internal low water flow control.
The maximum flow rate is limited by the permitted water heat exchanger pressure drop. Also, a minimum water
heat exchanger ΔT of 2.8 K must be guaranteed, which corresponds to a water flow rate of 5.4 l/m per kW.
Details for the plate heat exchanger water flow rate are shown below:
Monobloc outdoor units without hydronic module
Minimum Water flow rate, l/s
Maximum water flow rate, l/s
RUA – CP1701H*
0.45
1.3
RUA – CP2101H*
0.57
1.5
Monobloc outdoor units with fixed speed hydronic module
Minimum Water flow rate, l/s
Maximum water flow rate, l/s
RUA – CP1701H*
0.45
1.4
RUA – CP2101H*
0.57
1.6
Monobloc outdoor units with variable speed hydronic module
Minimum Water flow rate, l/s
Maximum water flow rate, l/s
RUA – CP1701H*
0.45
1.2
RUA – CP2101H*
0.57
1.2
The data shown above is applicable for fresh water at a temperature of 20°C (if glycol is used in the system then
the maximum water flow rate is reduced)
