64
( )
( )
In situations where the water cannot
be discharged
Method using the safety valve
As expanded water is discharged through
the safety valve, water must be run off.
6. Expanded water shall be handled in the following way.
When the instant hot water function is used, the volume of the water within the pipe expands, so
this must be followed.
• If the water input pressure (static sound
pressure) is up to 392 kPa;
Safety valve X 1
• If the water input pressure (static sound
pressure) is 392 kPa or more;
Pressure reduction valve X 1 +
Safety valve X 1
• Safety valve
687 kPa set up
• Pressure reduction valve
196 kPa set up
(to be arranged on site)
392 kPa set up
(to be arranged on site)
* In order to prevent air pockets in the circulation pump, air outlet / air vent shall be installed near the
appliance on the return line.
* The pipe must be firmly secured. If it is not secured firmly, abnormal noise may be generated when
the circulation pump is running.
* Thermal insulation suited to the location must be used to prevent the pipe from freezing.
(Water supply)
(Discharged)
(Water
supply)
Air vent
Air out
Safety valve
Return
Appliance
Forward
Pressure
reducing valve
Expansion tank
(connection is on top)
(Water supply)
(Water
supply)
Air vent
Air out
Return
Appliance
Forward
Pressure
reducing valve
Method using the expansion tank
R1/2
Drainage ditch
Rubber hose
Safety valve
Thermal insulation
is also arranged.
• The expansion tank shall be installed on the
return line.
• The expansion tank shall be installed with the
connector on top as per the above illustration.
