Daikin EWADC13T-XRC2 [14/23] D eimac01502 18_02en 14 23

D–EIMAC01502–18_02EN - 14/23

5.6 Sound protection

When sound levels require special control, great care must be exercised to isolate the unit from its base by appropriately

applying anti-vibration elements (supplied as an option). Flexible joints must be installed on the water connections, as well.

5.7 Water piping

Piping must be designed with the lowest number of elbows and the lowest number of vertical changes of direction. In this way, installation

costs are reduced considerably and system performance is improved.

The water system must have:

1. Anti-vibration mountings in order to reduce transmission of vibrations to the structures.

2. Isolating valves to isolate the unit from the water system during maintenance.

3. Flow switch, in order to protect the chiller must be protected against freezing by continuous monitoring of the water flow in the

evaporator. In most cases, on-site the flow switch is set to produce an alarm only when the water pump switches OFF and the water

flow fall to zero. it is recommended to adjust the flow switch in order to produce a “Water Loss Alarm” when the water flow reaches

50% of the nominal value, in this case the evaporator is protected against the freezing and the flow switch can detect the water filter

clogging.

4. Manual or automatic air venting device at the system’s highest point.; drain device at the system’s lowest point.

5. Neither the evaporator nor the heat recovery device must be positioned at the system’s highest point.

6. A suitable device that can maintain the water system under pressure (expansion tank, etc.).

7. Water temperature and pressure indicators to assist the operator during service and maintenance.

8. A filter or device that can remove particles from the fluid. The use of a filter extends the life of the evaporator and pump and helps to

keep the water system in a better condition. The water filter must be installed as close as possible to the chiller, as in Figs. 8

and 9. If the water filter is installed in another part of the water system, the Installer has to guarantee the cleaning of the water pipes

between the water filter and the evaporator.

Recommended maximum opening for strainer mesh is:

• 0,87 mm (DX S&T)

• 1,0 mm (BPHE)

• 1,2 mm (Flooded)

9. Evaporator has an electrical resistance with a thermostat that ensures protection against water freezing at ambient temperatures as

low as -16°C.

All the other water piping/devices outside the unit must therefore be protected against freezing.

10. The heat recovery device must be emptied of water during the winter season, unless an ethylene glycol mixture in appropriate

percentage is added to the water circuit.

11. If case of unit substitution, the entire water system must be emptied and cleaned before the new unit is installed. Regular tests and

proper chemical treatment of water are recommended before starting up the new unit.