Hitachi YUTAKI RWM-2R1E Installation & Operation Manual page 357

MAINTENANCE
Draining operation for YUTAKI S80
To drain the indoor unit follow the next procedure:
1 Switch OFF the main power supply of the indoor unit.
2 Close the 2 shut-off valves (factory-supplied) installed at the space heating connections (Water inlet and outlet connections).
3 Connect a drain pipe to the drain port of the shut-off valves and lead it to the general draining system.
4 Open manually the drain port of the shut-off valves and collect the water into a bucket.
5 Once all the water has been drained, close again the drain port of the shut-off valves and open the main shut-off valve to restart
the normal operation.
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C A U T I O N
When draining the indoor unit water from its drain port, the leaved water could be hot and could keep in pressure. Perform the draining procedure
carefully.
Draining operation for YUTAKI M
YUTAKI M has no drain port factory supplied. It is highly recommended to install a drain port valve attached to the water outlet of the
YUTAKI M unit in order to ease the operation of draining. When the drain port is installed the draining procedure for the YUTAKI M
follows the next steps:
1 Switch OFF the main power of the unit.
2 Close the shut-off valve installed at the water inlet connection (field supplied).
3 Connect a pipe or a drain hose to the drain port (field supplied) placed in the water outlet pipe of the unit.
4 Open manually the drain port of the shut-off valve (field supplied), and collect the water into a bucket (or to a sewage system)
5 Once all the water has been drained, and all maintenance operations have been finished, close again the drain port and open
again the valve of the water inlet pipe to restart the normal operation of the unit.
343 PMML0575 rev.2 - 03/2022