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5.8 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.
5.9 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.
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.
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.
12. In the event that glycol is added to the water system as anti-freeze protection, pay attention to the fact that suction
pressure will be lower, the unit’s performance will be lower and water pressure drops will be greater. All unit-protection
systems, such as anti-freeze, and low-pressure protection will need to be readjusted.
13. Before insulating water piping, check that there are no leaks
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