Toshiba HWS-803XWHM3-E Installation Manual page 7

Hydro Unit
• Perform installation work properly in accordance with the installation manual.
Inappropriate installation may result in water leaks, electric shock or fire.
• Tighten all flare nuts with a torque wrench in the specified manner.
Excessive tightening of the flare nut may result in cracking of the pipe work or flare nut which may result in a
refrigerant leakage.
• Wear heavy duty gloves during installation work to avoid injury.
• Install the outdoor unit securely in a location where the base can sustain the weight adequately.
• In enclosed areas, if the refrigerant leaks during installation vacate and ventilate immediately.
• After installation is complete ensure and confirm that refrigerant does not leak.
If refrigerant leaks into a room and flows near a fire source noxious gas may be generated.
• Do not block any drain hoses. Hoses may come off and electric shocks may occur.
• Do not hit the manometer, because it is made of glass. It is breakable.
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.
11 and 14 kW 18 L/minute or more
8 kW 13 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. Failure to do could result in premature system failure.
• 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 fo 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 cirduit. Do not use an open circuit design.
• Circulating water must be 20 liters or more. If total water amount is not enough, the unit may not function fully
due to protective operation.
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Installation Manual
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