10.1.2 General maintenance procedure for the indoor unit
To ensure good operation and reliability of the indoor unit, main parts and field wiring have to be checked periodically.
The following checks have to be done by qualified technicians at least once a year:
1
Cabinet
•
Stain: Check for any stain and remove it cleaning if it is the case.
•
Fixing screw: Check for any loosened screw or any lost screw. Tighten the loosened screws and replace the lost screws.
•
Insulation material: Check for any peeled thermal insulator on the indoor part of the covers. Repair the thermal insulator.
2
Water piping connection
•
Leakage: Check there are no water leakages neither in the inlet and outlet water connections (space heating and DHW if
used), nor in the main water circuit nor the tank connections. Check all the joints, connections and circuit elements.
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N O T E
• If leakage is detected in the inlet/outlet water connections, repair it and remember to replace the gaskets.
• Pay special attention to the water pipe connection placed over the electrical box.
3
Water flow and pressure:
•
Water flow:
-
Space heating: Check the water flow (m
3
/h) through the unit controller in the “Heat Pump Details” of the “Operation
Information” menu.
-
DHW (if used): Check whether the water circulation is correct along all the DHW circuit.
•
Pressure checking:
-
Space heating: Check the water pressure using the manometer in the indoor unit. This value shall be between 1.5 and
2.0 bars approximately (1.8 bars is a proper value).
The manometer is placed at different positions according to each unit model
In YUTAKI S and S COMBI models, the manometer is installed factory supplied as it is shown:
YUTAKI S
YUTAKI S COMBI
Manometer
Manometer
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N O T E
The water pressure must remain above 1 bar in order to prevent air from entering the circuit, and below 3.0 bars (safety valve opening value).
-
DHW (if used): Check there is no loss of pressure and ensure that DHW pressure is not higher than 6 bars. Connect a
gauge to the DHW drain port for this purpose.
4
Ground wire
•
Ground line: Check for the continuity to earth in the main electrical components.
MAINTENANCE
PMML0575 rev.1 - 09/2021
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