Micoe Heat Pump - A Dead Loss

[quantum]

All I can do is warn everyone if you see Micoe heat pumps, wherever in the world you are.

Homeowner has fixed a number of problems. First, its control of the three-way valve (DHW or hydronic) is backward from others, so the 1" lines had to be replumbed, swapping the roles of DHW and hydronic. This is a Euro valve so requires 230vAC, so they send it L1 and L2 to blue and brown. Black is the control, so it needs connected to its opposite (L1 or L2, depending on how the outside is wired. Bottom line: now the infernal heat pump appropriately switches the valve according to whether DHW or hydronic, or both, are selected.

He actually got the damned thing to heat the house for several days in hydronic mode, after purging tiny bits of air using scores of gallons of water. But the need for a shower became intense. He switched it to DHW and purged and purged and purged, but it still faults on 'water flow' switch.

It is hyper-sensitive to air in the system and faults. It has an air purge, and the owner has an air purge, but they're not enough. Either the cheap-arse pump can not prime when a few bubbles, or the flow switch is badly located.

I would recommend Arctic Air. They are also made in Red China (yeees, it is still a Communist State) and can be had much cheaper than from Arctic.