MCAC-RTSM-2011-12 Midea Combo Type Heat Pump Water Heater Technical Manual
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8. Duct connection
A: Air inlet and outlet without duct B: Only air outlet with canvas, A≤5m
It is recommended to install unit by this way in the winter
where there is other heat source in the room.
C: Air inlet and outlet with duct. (A+B≤5m) D: Only air inlet with canvas A≤5m
It is recommended to install unit by this way in summer
that could charge fresh air into room