Hitachi YUTAMPO Series Service Manual page 92

7 Maintenance notes
Maintenance work
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Filling the DWH tank with water
Follow the steps below when starting up the unit for the first time or when it has not been used for an extended period of time.
1 Open the outlet water taps of the DHW, to expel all the air from inside the tank.
2 Turn on all the connected mixer taps (hot water side).
3 Open the inlet valve of the DHW tank in order to fill the tank. If there is a shut-down valve installed in the DHW tank
outlet, open it to allow circulation through the DHW installation.
4 When water begins to flow from the outlet water taps of the DHW installation, close all these taps.
5 Turn off all the connected mixer taps.
6 Inspection
a. After filling the tank, check all pipe, heater and anode joints and the tank for leakage.
b. Check operation of the pressure relief valve.
c. After heating water for the first time, check water leakage from the pipe, heater and anode joints and the tank
once more.
84 SMGB0135 rev.0 - 06/2020