Daikin EWYE019CZN-A1 handleiding
Handleiding
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4.7 Water circuit for connection with the unit
4.7.1 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. Antivibration 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. The BPHE must not 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. Precautions for correct use:
• All water components and piping/hydraulic devices outside the unit must therefore be protected against freezing.
• All water components (eg.BPHE) and piping/hydraulic devices must be emptied of water during the winter
season, unless an ethylene glycol mixture in appropriate percentage is added to the water circuit.
• In 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.
• If glycol is added to the water system as antifreeze 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 antifreeze, and low-pressure protection will have to be readjusted.
• When fastening the plant piping to the unit water piping, it is recommended to hold the threaded counterpart tight
while fastening, to avoid unintentional rotations.
The maximum glycol percentage is 40% for all the unit.
In the following table are illustrated the minimum glycol percentage for low ambient air temperature
AMBIENT T [C°]
-3
-8
-15
-20
-25
ETHYLENE GLYCOL
10%
20%
30%
40%
50%
PROPYLENE GLYCOL
10%
20%
35%
40%
50%
Table 2 - Minimum glycol percentage for low ambient air temperature
Protection of the water circuit is necessary in the winter season, even with the unit not in operation.
• 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).
• Check that the water pressure does not exceed the design pressure of the water side heat exchangers. Install a
safety valve on the water pipe downstream of the BPHE.
9. Select the piping diameter in relation to the required water flow and available external static pressure of the pump.
See the following table for the recommended water piping diameter.
4.7.2 Flow-switch
Flow switch is a standard component fitted to all units. To ensure sufficient water flow through the plate exchanger, it is
essential that a flow switch be installed on the water circuit. It is already installed in the standard supply. The purpose of
the flow switch is to stop the unit in the event of interrupted water flow, thus protecting the BPHE from freezing.
This is a palette flow switch appropriate for uninterrupted use outdoors (IP65).
Unit
Water piping diameter
EWYE019~035CZ(N/P)-A1
1 ¼”
EWYE050~070CZ(N/P)-A2
2”
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Productinformatie
| Merk | Daikin |
| Model | EWYE019CZN-A1 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 8033 MB |
