Outdoor Unit
Installation Manual
– 20 –
Curing of pipes
When removing and opening the Hydro or Outdoor Unit for a long time, cure the pipes as follows:
• Otherwise rust may be generated when moisture or foreign matter due to condensation enters the pipes.
• The rust cannot be removed by cleaning, and new pipes are necessary.
Placement
location
Term Curing manner
Outdoors
1 month or more Pinching
Less than 1 month
Pinching or taping
Indoors Every time
Warnings on Refrigerant Leakage
Check of concentration limit
Theroominwhichtheairtowaterheatpumpistobeinstalledrequiresadesignthatin
theeventofrefrigerantgasleakingout,itsconcentrationwillnotexceedasetlimit.
The refrigerant R32 which is used in the air to water heat pump is safe, without the toxicity or combustibility of
ammonia, and is not restricted by laws to be imposed which protect the ozone layer. However, since it contains
more than air, it poses the risk of suffocation if its concentration should rise excessively. Suffocation from leakage
of R32 is almost non-existent.
If a conditioner system is to be installed in a small room, select a suitable model and installation procedure so that if
the refrigerant accidentally leaks out, its concentration does not reach the limit (and in the event of an emergency,
measures can be made before injury can occur).
In a room where the concentration may exceed the limit, create an opening with adjacent rooms, or install
mechanical ventilation combined with a gas leak detection device.
The concentration is as given below.
Refrigerant Concentration Limit shall be in accordance with local regulations.
Total amount of refrigerant (kg)
Min. volume of the indoor unit installed room (m
3
)
≤ Concentration limit (kg/m
3
)
39-EN
40-EN
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