In monobloc heat pumps, part of the system water is located in the outdoor unit and is directly exposed to low temperatures.
Risk
During a power outage, the circulator pump does not operate and water may freeze in the outdoor heat exchanger or in the piping.
Protective measures
Depending on the design, glycol, special anti-freeze valves, or other approved strategies are used.
Important
Protection must be designed before installation and not after frost damage has occurred.
