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Before installing/commissioning the unit, make sure to check the following points :
- The maximum water pressure of the unit is 2.8 bar static pressure.
- The operating range of leaving water temperature is 25~65˚C at heating conditions and 5~25˚C at cooling
conditions.
- The minimum required water flow for operation is 16 liters/min. At all times the required water flow-rates
should remain. Otherwise, the unit can stop due to a lack of water.
- Water quality must be according to EN directive 98/83 EC.
- If the unit and the pipes are exposed to freezing temperature, It can cause damage to the hydraulic system.
Special care must be taken to prevent freezing of the total water system.
- The unit is designed to be used in a closed-loop system. Do not use any other components which are designed
only for a open-loop system.
- Never use Zn-coated parts in the water circuit.
- All hydraulic parts including field piping must be insulated to reduce heat loss and condensation.
- It is recommended to install the make-up water assembly to feed small quantities of water to the system
automatically, replacing the minor water losses and maintaining the system pressure.
- Drain taps must be provided at all low points of the system to permit complete drainage of the circuit for
maintenance use.
- Make sure that the check valves are correctly installed in the system (field supply).
- Flush pipes out with clean water to remove contaminants in pipes during installation.
- The strainer(water filter) must be cleaned after flushing the pipes, and it should be cleaned periodically.
Replace strainer when necessary.
- Charging : Charge the water until a pressure of 1.5~2.0bar by using make-up water assembly(Field supply).
(The water pressure indicated on the manometer will vary depending on the water temperature)
The nominal water pressure in the system should remain about 1.0 bar at all times to avoid air entering the
water system.
- Air purging; Make sure that air should be vented from the system at start-up or after installing/ servicing.
The air vent valve must be opened during charging the water (at least 2 turns) in order to removeall air in the
circuit, and a make-up water assembly allows water into the system continuosly.
- In case that the water piping would be located in a higher position than the air vent of the unit, it is necessary
to add an additional ones in the highest position of water circuit. The air vent should be located both where
water temperatures are the highest and where the height of pipes are the highest.
- Always use materials which are compatible with water used in the system and with the materials used on the
indoor unit.
- Select piping diameter in relation to required water flow and available ESP of the pump.
- Use chemical cleaning agents(Begin with acid , finish with alkali).
- Do not operate the system with closed valves because it results in damaging the heat pump.
CAUTION
