An installer plans to use a single-speed monobloc air-to-water heat pump to supply several panel radiators. The radiators are equipped with thermostatic radiator valves to allow for room-by-room zoning. Because of this, the install sets up the radiators in parallel and as a secondary circuit to the primary circuit running through the heat pump. The proposed piping layout is shown in Figure 1. The heat pump is enabled to operate whenever the outdoor temperature is at or below 55° F. The compressor and primary loop circulator run whenever the loop temperature drops to 120° or less, and turn off when the loop temperature reaches 130° or higher. Can you spot some potential problems with this layout? How would you propose correcting any issues you identify?