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PMML0600 rev.0 - 06/2022
5
INDOOR UNIT DRAINING OPERATION
DRAIN AND WATER PIPING
5.3.2 Draining operation for YUTAKI H Combi
◆ Draining of the indoor unit
1 Switch OFF the main power supply of the indoor unit.
2 Close the 4 shut-o valves installed at the space heating and outdoor unit connections (Water
inlet and outlet connections).
3 Open manually the drain port for indoor unit water and collect the water into a bucket.
4 Once all the water has been drained, close again the drain port for indoor unit water.
! CAUTION
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 of the DHW circuit
1 Switch OFF the main power supply of the indoor unit.
2 Close the main DHW inlet valve (water inlet shut-o valve) in order to avoid the tank lling.
3 Open the shut-o valve of the DHW outlet to allow draining without creating a vacuum.
Ensure that valve at the highest level of the DHW system is also opened.
4 Connect a drain hose to the drain port for DHW and lead the other end to the general draining.
5 Open manually the drain port for DHW and wait a long time until all the water has been
removed.
! CAUTION
When draining the DHW from its drain port, the leaved water could be hot and could keep in
pressure. Perform the draining procedure carefully.
DHWT Drain
Indoor unit drain
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