Fan coil units, freezing method

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fan coil units for low temperature in the winter disabled, and how to antifreeze?
Method One:
A. Central air conditioning in the design should consider wint er frost, frost means recommend the use of hot water, do not support the use of steam and electric heating. Steam antifreeze can also be prone to the phenomenon of uneven temperature, fan coil units, the upper temperature is relatively high, the bottom has begun to freeze. Does not support use of electric heating, the first electric heating is prone to dangerous electric heating costs of electricity, not energy, have to be careful not to individual fan coil switch in the control of all control, it should be.
Two. If the winter does not use fan coil units, it is recommended that:
a. The fan coil inside the water all to let go,
and b. And blind plate in the water supply and return water
(c) The use of compressed air (depending on the size of the fan coil compressed air blowing time)
(d) Fan coil antifreeze, do not have to fill, but make sure the fan coil liquid fully antifreeze dilution.
e. Design, when the circulation pump.
Method 2:
The design of the chilled water system in parallel with a circulating pump of small capacity.
A. If the system in winter is disabled, but a heat source, heat source switch to the fan coil water system, so that the small loop pump running.
Two. No heat source, can be set to the combined operation of an electric heater (shell and tube in parallel with the water system) with the small loop pump, fan coil water system pipe within the water temperature of not less than 5 ° C to ensure ice-free. To the system of water to ensure that 5 ℃, electric heating power is not too large, the running costs are not high, and more reliable than water, antifreeze and other methods. The above method for reference.