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Fig. 25. – Multiple Chiller Installation
4.5 Water circuit for unit connection
4.5.1 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 and system performance is improved.
Water system must have:
- Anti-vibration mountings in order to reduce transmission of vibrations to thewhole structure.
- Isolating valves to isolate the unit from the water system during maintenance.
- In order to protect the chiller, the evaporator must be protected against freezing by continuous monitoring of the
water flow in the evaporator itself 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 50% of the nominal value; in this case
the evaporator is protected against freezing and the flow switch can detect the clogging of the water filter.
- A manual or automatic air venting device at the system’s highest point and a drain device at the system’s lowest
point.
- Neither the evaporator nor the heat recovery device must be positioned at the system’s highest point.
- A suitable device that can maintain the water system under pressure (expansion tank, etc.).
- Water temperature and pressure indicators to assist the operator during service and maintenance.
- A filter or any 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. 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 evaporator. If the unit is provided with
hydronic freecooling system, an additional filter is installed by factory on the water manifold before the MCH
coils to prevent clogging. However a water filter at the head of the circuit is always mandatory.
- Recommended maximum opening for strainer mesh is:
• 1.0 mm (BPHE)
• 0.87 mm (DX S&T)
• 1.2 mm (Flooded)
- Evaporator with an electrical heater controlled by the unit logic that ensures protection against water freezing at
water temperatures lower than antifreeze setpoint.
- ll the other water piping/devices outside the unit must therefore be protected against freezing.
- 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.
- If case of unit replacement, 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 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 higher. All unit-protection systems,
such as anti-freeze, and low-pressure protection will need to be readjusted.
- 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 evaporator.
Bekijk gratis de handleiding van Daikin EWFD495TZSSD1, stel vragen en lees de antwoorden op veelvoorkomende problemen, of gebruik onze assistent om sneller informatie in de handleiding te vinden of uitleg te krijgen over specifieke functies.
Productinformatie
| Merk | Daikin |
| Model | EWFD495TZSSD1 |
| Categorie | Airco |
| Taal | Nederlands |
| Grootte | 11779 MB |
