Hitachi YUTAKI Serie Installations- Und Betriebshandbuch Seite 189

MAINTENANCE
5 DHWTank inspection hatch
The DHW tank has an inspection hatch at the bottom. This hatch allows the inspection of the interior of the tank.
!
D A N G E R
Be careful when using this inspection hatch. There are high temperature and high pressure inside the tank. Before open it wait a
reasonable time for the water to cool.
For a safe operation using the inspection hatch, proceed as it is explained in the manual of the specific unit.
Additional hydraulic elements are necessary in the DHW circuit. Refer to chapter
6 Filter +:
The Filter + valve is an on-off ball valve containing an interchangeable cylindrical filter which is easy to inspect and remove for
normal maintenance operations. Normally, Filter + ball valve it is used as a shut-off valve by turning the handle 90º clockwise (1).
Filter+ ball valve makes the maintenance operations easier. Once the valve is in closed position, open the draining port tap(2)
and, by turning the handle up to 22º clockwise, the water from the inlet is guided behind the filter and runs in opposite direction
through the draining port(3). The water circuit can be cleaned even under full pressure, avoiding the need to drain the unit prior
the cleaning process. After cleaning, simply close the draining port tap(2), and open the valve again.
Ball in closed position
OUTLET
At this position, the mesh
can be removed from the
filter ball for maintenance
tasks
OUTLET
?
N O T E
The draining port must be connected to the sewage system by means of a hose or a pipe.
!
C A U T I O N
• Take care when draining the unit. Ensure the connection of the hose or drain pipe in order to avoid water leakage on any electrical component.
• The expelled water could be hot and could keep in pressure. Take care with this draining.
177 PMML0335A rev.1 - 04/2016
INLET
OUTLET
OUTLET
INLET
90º Close
"6 REFRIGERANT AND WATER
Ball in cleaning position
Ball ready to clean-cut
with flush. An extra 22º is
needed to rotate the ball.
22º
PIPING".
INLET
INLET
Water flow