Antifreeze Method for the Y641 Boiler Fan Coil

Antifreeze Method for the Y641 Boiler Fan Coil

Antifreeze Method for the Y641 Boiler Fan Coil Method 1: 1. The design of the Y641 boiler fan must take winter freeze protection into account. To prevent freezing, I recommend using hot water. Steam and electric heaters are not recommended. Although steam can be used for defrosting, the temperature tends to become uneven. The upper part of the Y641 boiler fan coil tends to be relatively warm, while the lower part begins to freeze. Electric heaters are also not recommended. First, electric heaters pose a safety hazard. Second, they consume electricity and are not energy-efficient. In terms of control, individual Y641 boiler fan coil units cannot be turned on or off independently; please ensure that the system is fully controlled. 2. When the Y641 boiler fan coil is not in use during winter, the following methods are recommended. A. Drain all water from the Y641 boiler fan coil. B. Install blind flanges on the supply and return water lines. C. Blow compressed air into the system (determine the duration based on the size of the fan coil). D. Add antifreeze to the fan coil unit; it does not need to be filled to capacity, but ensure that the liquid inside the unit is completely diluted with antifreeze. E. Include a circulation pump in the design. Method 2: In terms of design, a small-capacity circulation pump is connected in parallel with the chilled water system. 1. If a heat source remains available when the system is shut down for the winter, the heat source can be redirected to the fan coil unit’s supply water system by starting the small circulation pump. 2. If no heat source is available, configure the electric heater (shell-and-tube type connected in parallel with the water supply system) to operate in conjunction with the small circulation pump. Therefore, set the water temperature in the Y641 boiler fan coil water supply system piping to 5°C or higher to prevent freezing. Since the water in the system is maintained at 5°C, the electrical power consumption of the heater will not be excessive, and operating costs will remain low. This method offers higher reliability compared to draining the system or adding antifreeze.