D-EIMWC01008-16_03EN - 17/35
In cases where the installation is subject to compliance with special sound requirements, it may be necessary to use
additional noise attenuation devices, it is necessary to isolate the unit from its base with extreme care, correctly applying
the anti-vibration elements (supplied as optional). Flexible joints must be installed on the water connections, as well.
5.5
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 to reduce transmission of vibrations to the structures.
2. Isolating valves to isolate the unit from the water system during maintenance.
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. In most cases, on site, the flow switch is set to generate an alarm only when the water pump
turns off and the water flow drops to zero. It is recommended to adjust the flow switch to produce a "Water Leakage
Alarm" when the water flow reaches the minimum value of the flow allowable (see table 1); in this case the BPHE is
protected against freezing and the flow switch can detect the clogging of the water filter.
4. Manual or automatic air venting device at the system highest point and drain device at the system lowest point.
5.
Neither the BPHE 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 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)
Precautions for correct use:
9. BPHE has an electrical resistance with a thermostat that ensures protection against water freezing at ambient
temperatures as low as -18°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. 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.
13. Before insulating water piping, check that there are no leaks. The complete hydraulic circuit must be insulated to prevent
condensation and reduced refrigeration capacity. Protect the water pipes from frost during winter (using for example a
glycol solution or a heating cable).
14. Check that the water pressure does not exceed the design pressure of the water side heat exchangers. Instal l a safety
valve on the water pipe downstream of the BPHE.
5.5.1
Water piping installation procedure
The units are equipped with a water inlet and water outlet for connection to a chiller water circuit. This circuit must be
provided by a licensed technician and must comply with all relevant European and national regulations.
If air or dirt gets in the water circuit, problems may occur. Therefore, always take into account the
following when connecting the water circuit.
1.
Use clean pipes only.
2.
Hold the pipe end downwards when removing burrs.
3.
Cover the pipe end when inserting it through a wall so that no dust and dirt enter
1. Preparing the unit for connection to the water circuit. A box containing Victaulic
®
couplings and a filter is
delivered with the unit.