D-EIMHP01702-23_00EN- 23/72
2. Isolating valves to isolate the unit from the water system of the installation during service operations.
3. To protect the unit, the BPHE must be protected against freezing by continuous monitoring of the water flow in the BPHE by
a flow switch provided with unit. Be sure to install the flow switch according to the instructions present in this manual (See
paragraph WATER PIPING INSTALLATION PROCEDURE).
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.
7. Water temperature and pressure indicators to assist the operator during service and maintenance.
8. A water filter or a device that can remove particles from the liquid and is mandatory at the entry of the evaporator/condenser.
9. A filter or device that can remove particles from the fluid. The use of a filter extends the life of the BPHE 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 unit. If the
water filter is installed in another part of the water system, the Installer must guarantee the cleaning of the water pipes
between the water filter and the BPHE.
Recommended maximum opening for strainer mesh is:
• 0.87 mm (DX S&T)
• 1.0 mm (BPHE)
• 1.2 mm (Flooded)
10. BPHE can be equipped with an optional electrical resistance with a thermostat that ensures protection against water freezing
at ambient temperatures as low as -20°C.
11. When the manifold module is equipped, the water filter shall be mounted upstream the manifold module.
12. At ambient temperatures below 0°C, it is mandatory to equip the unit with optional electrical resistance.
13. All the other water piping/devices outside the unit must therefore be protected against freezing.
14. 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.
15. If glycol is added to the water system as anti-freeze protection, pay attention to the fact that suction pressure will be lower,
the unit performance will be lower and water pressure drops will be greater. All unit-protection systems, such as anti-freeze,
and low-pressure protection will have to be readjusted.
16. The filter can be installed at the entrance of the pump when it is placed on the input pipe of the water of the evaporator,
only if the cleanliness of the water installation between the pump and the evaporator is guaranteed. Any slag in the
evaporator causes the warranty of the unit to be forfeited.
17. If the unit is being replaced, empty and clean the entire water system before installing a new one and prior to starting it
conduct adequate tests and chemical treatments of the water.
18. Before insulating water piping, check that there are no leaks.
19. Check that the pressure of the water does not exceed the design pressure of the water side heat exchangers and install a
safety valve on the pipe of the water.
20. Install a suitable expansion.
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