– 3 –
Hydro Unit
Installation Manual
3 Preparations for installation
■Parts required to connect this product (Common items)
■Options required for each function
Category Part
Specification
Quantity
Water piping
Drain cock (for water charge) 1
Isolating ball valves
1"
for service 1"
2
Electrical system
Earth leakage breaker for main power supply 30 mA 1
Earth leakage breaker for backup heater 30 mA 1
Purpose
In the Hydro Unit Purchased part
Part name Model name Part name Prescribed specification
Heating – –
Radiator(s), Fan coil(s), Under
floor heating
Heating & Cooling
(all rooms)
– – Fan coil(s)
Heating & Cooling
(partly heating only)
––
Motorized 2-way valve (for
cooling)
Refer to “Control parts
specifications” on page 13.
Interlocking with boiler – – Boiler
Other power supply.
Signal 12 V input function is
required for boiler.
4 Precautions for safety
■General safety precautions
Ensure that all Local, National and International regulations are
satisfied.
• Read the “Precautions for safety” carefully before installation.
• The precautions described below include the important items
regarding safety – Observe them without fail.
• After the installation work has been completed, perform a test run
to check for any problems. Follow the Owner’s Manual to explain
how to use and maintain the unit to the customer.
• Turn off the main power supply switch (or breaker) before unit
maintenance.
• Ask the customer to keep the Installation Manual along with the
Owner’s Manual.
■Refrigerant precautions
• If a refrigerant leak is suspected contact the dealer who supplied
the system, in the case of a recharge of refrigerant ask service
personnel for details of the leak and confirmation of the repairs
completed.
• Generally the refrigerant does not leak, however, if the refrigerant
should leak into a room and a heater or stove burner in the room
is lit, toxic gas may be generated.
• Do not install the system in a location subject to a risk of exposure
to a combustible gas.
If a combustible gas leaks and stays around the unit a fire may
occur.
5-EN 6-EN
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