Mits servicing sheet

Client

Check unit casing for damage

Check the condition of the heat exchanger, clean the heat exchanger, check for fin damage

Check the outdoor unit air discharge space

Check the outdoor fan for vibration and noise

Check that the drain from the outdoor is not blocked.

Check the condition of the electrical isolating switch and tighten cable terminations.

Check for signs of refrigerant leakage i.e. oil in base of unit or around flare nuts

Ensure that the refrigeration piping insulation is not damaged

Check that all connectors are securely connected to the outdoor unit PC board.

Check the refrigerant operating pressures are normal.

Check water pressure using manometer

Check the circulating pump for noise and vibration.

Test the pressure relief valve in the hydro box and ensure water drains away adequately.<br>

Inspect the outer casing of the hydro box for any damage

check heating expansion vessel pressure

Isolate the water flow and return valves, drain water and clean the water strainer.

Check the refrigeration pipes for signs of refrigerant leakage

Check and tighten the electrical connections inside of the switchbox especially the contactors and circuit <br>breakers.

Check the water piping for any leaks

Inspect the condition of the DHW tank for any damage.

Check the operation of the pressure relief valve on the combination valve.

Check the operation of the pressure relief valve on top of the tank

check hot water expansion pressure

Check the operation of the thermal protectors

Check the operation of the 2/3 port valve.

Check the set points for space heating

Check the set point for domestic hot water

Check the current time and day setting on the controller

check operation of external programmable stat adjust if on program 1

repairs required