Specifications

4-30
Replacement method of antifreeze liquid water
There are following two methods for changing the antifreeze liquid mixed water:
Replacing using water heater exchange mode
1
Select the “WATER CHNG” in the maintenance menu.
(1) Press the key in the local mode.
(2) Select the [MAINTENANCE] by pressing the or key, and press the key.
(3) Select the [WATER CHNG] by pressing the or key.
(4) Press the key.
2
Press the key.
• Cooling of antifreeze liquid remaining in the
system starts.
• 20 to 30 minutes will be required for the cooling of the water heater device.
3
Press the key when the
[WASTE AF] is displayed.
4
Remove a cover of the water heating system at
main unit rear.
• Open the cover after removing screws (4) fixing both sides of
the cover.
5
Release the catch clip.
Make replacement using hot
water exchange mode on the
maintenance menu. ( Refer to
the bottom of this page).
The antifreeze liquid mixed water inside the piping can also be
discharged completely. Further, this work is performed safely, as it may
be done after the water heater device has been cooled down
completely.
However, 20 to 30 minutes will be required for the cooling of the water
heater device.
Make replacement turning the
power OFF, and after removing
the blue colored socket.
( P.4-32)
As there is no need for the time for cooling down of the hot water, the
replacement works can be performed within a short time, but the
antifreeze liquid mixed water inside the piping cannot be replaced.
Further, when the power has been put on this device for a while, the
temperature of the water heater tank does not go down soon even if the
power is turned OFF.
When the water heater tank is at an elevated temperature, there exists
possibility of burn injury.
FUNCTION
ENTER
ENTER
WATER CHNG
COOL I NG
ENTER
WATER CHNG
WA S T E A F : e n t
ENTER