This Mitsubishi HVAC servicing sheet is designed for routine maintenance of air-to-water heat pump systems and related hydronic components. It guides technicians through checks for unit casing damage, heat exchanger cleaning and fin condition, adequate outdoor air discharge, fan vibration and noise, drain blockages, and electrical isolating switch integrity. Tasks include inspecting for refrigerant leaks, verifying insulation on refrigeration piping, confirming secure PCB connections, and checking normal operating pressures. Hydronic steps cover measuring water pressure, assessing circulating pump operation, testing hydro box and tank pressure relief valves, cleaning the water strainer, and inspecting water piping and DHW tank condition. It also prompts verification of thermal protectors, 2/3 port valve operation, heating and hot water set points, controller time/day settings, and external programmable thermostat function, with sections for repairs and comments.
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