– 6 –
Hydro Unit
Installation Manual
■
Notes on system design
• The inlet water temperature for space heating to the Hydro Unit for
HWT-110 must be 65 °C or less. (For HWT-60 must be 55 °C or
less.)
Especially, be careful when there is an external heating source
such as a boiler.
When hot water over 65 °C or 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 kW 13 L/minute or more
6 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 and during
domestic hot water (DHW) production.
• 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
system is started and ensure the power remains switched on for
the period of use.
5
Example of Hydro Unit installation
■
Example of installation for cooling and heating
When both cooling and heating modes are required a 2-way valve must be installed to isolate the radiator or under-
floor heating circuit.
▼
Fig.5-01
Fan Coil Units
(Cooling or Heating)
Diverting 3-Way
Valve for
Sanitary Hot
Water Cylinder
Radiators (Heating Only)
[2-Way Valve Control]
2-Way
Valve
2-Way
Valve
Alternative to Radiators
Under-floor Heating
(Heating Only)
[2-Way Valve Control]
Indirect Sanitary
Hot Water Cylinder
Drain Cock for water
Charge and Drain
Use the 2-
way valve
to isolate
the heating
circuit
when in
cooling
mode.
Use it when do not
operate cooling.
Isolating
Ball Valves
M
M
TTW
M
11-EN
12-EN
Summary of Contents for HWT-1101F21MM3W-E
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