How to prevent freezing of outdoor unit pumps?

There’s no need to consider running the pump; just slightly open the outlet valve of the standby pump to preheat it, and keep the cooling water flowing continuously. There are also those with electric heating, and there are many methods.

Reply to 1# gw821022: Haha, this is a crucial task during winter; generally, this work needs to start when the ambient temperature drops to as low as 5 degrees Celsius. Of course, anti-freezing measures need to be taken into account during equipment selection and installation. Common practices: 1. Provide hardware safeguards such as heating pipes, insulation layers, or insulated enclosures to supply heat and prevent freezing in low-temperature conditions; electric heating is not used in such cases. 2. Operation: Turn on the heat source and check that the heating system is functioning properly ； The cooling water channels of the pumps are kept from freezing by continuous flow; for standby pumps, a small pipeline connecting to the pump in use can be manually installed as a return line to prevent freezing (this method can be used when the fluid is prone to freezing), or the standby pump can be started periodically.