Chapter 5 Water Connections 27
Liebert.CRV Series Air Conditioner User Manual
5.3 Chilled Water Connections For Water/Glycol-Cooled (W) Units
For rear bottom cooled water condensed connections, see Figure 5-4.
Figure 5-4 Rear bottom cooled water condensed connections
The unit must receive cooling water as follows:
1. From an external cooling water source, in open circuit (see Figure 5-6).
2. Using a Dry cooler, in closed circuit (see Figure 5-7).
Connect the piping by reference to Appendix 4 Refrigerant, Hydraulic And Electrical Connections.
It is advisable to use hoses to be connected, with 3-piece joints, to the condenser water inlet and outlet
couplings.
Install a 16 ~ 20 mesh strainer on the chilled water supply to the Liebert.CRV. The strainer is needed to prevent
particles in the chilled water from entering the heat exchanger of the Liebert.CRV.
Place shut-off ball valves at the conditioner inlet and outlet to allow easy maintenance.
It is advisable to install a water drain system at the lowest point in the circuit.
Fully drain the piping before connecting it to the air conditioner.
5.3.1 Notes For Open Circuit Applications
Use the unit with mains or well water. Do not use water from an evaporative cooling tower unless the filling water
hardness is controlled.
The water pressure must be 2bar ~ 10bar (if this is not so, contact the technical support department).
The required water flow at different temperatures is given in our catalogues or on request.
If necessary (very low water temperature) insulate both pipes using Armaflex insulation.
5.3.2 Notes For Closed Circuit Applications
The installation in Figure 1-8 is indicative only; for individual installations follow the project diagram.
Install a pump system calculated on the basis of the flow and total head of the system (see project data), and
controlled by the compressor running.
Insulate both pipes using Armaflex insulation.
Very important: Add water and ethylene glycol to the circuit, when the ambient temperature is below zero. Do not
exceed the nominal operating pressure of the circuit components.
Bleed air out of the circuit.
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