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Hydro Unit
Installation Manual
EN
Notes on system design
• The inlet water temperature to the Hydro Unit must be 55 °C or less.
Especially, be careful when there is an external heating source such as a boiler.
When hot water over 55 °C returns, it may result in a failure of the unit or water leakage.
• The flow rate of the circulating water must meet the following range.
14 kW 18 L/minute or more
8 kW 13 L/minute or more
4.5 kW 10 L/minute or more
If the flow rate becomes less than the minimum, the protective device is activated to stop the
operation.
To ensure the minimum flow rate of the water system, install a bypass valve on one water
circuit. Please note this circuit must contain a minimum of 20 liters. If total water amount is not
enough, the unit may not function fully due to protective operation.
• Do not drive water by power other than the pump built in the Hydro Unit.
• The back up heaters, in the hydro unit, are designed to assist the heat pump during periods
of low ambient conditions.
• Ensure the Hydro unit and the connecting water pipes are installed in a location that is not
exposed to low ambient temperatures which could result in the water circuit freezing.
• The system operation is designed around a closed water circuit. Do not use an open circuit
design.
• Please turn on the main power supply to up to 12 hours before the start of the operation, and
don’t turn off the power all the time during the period of use.
8-EN
Summary of Contents for HWS-1405XWHM3-E
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