The invention relates to a
variable refrigerant flow system combined with air source
heat pump hot water and a control method of the
variable refrigerant flow system. According to the
variable refrigerant flow system, condenser heat of a traditional VRF air conditioner in summer is recycled effectively for preparing domestic hot water, part of the obtained domestic hot water is used for domestic water, the other part of the obtained domestic hot water is used for reheating air supplied by an
indoor air conditioner, and thus the influence of
dew-point air supply of a multi-split air conditioner system on the indoor environment temperature and the
human body comfort is eliminated; and in addition, after the VRF outdoor unit is frosted at the low temperature in winter,
defrosting is conducted through an air source
heat pump hot water system, and the defect of fluctuation, caused by reverse operation of the air conditioner system in winter, of the indoor environment temperature is overcome. The system also can meet the needs of users on the domestic hot water all year around. The users can switch the
operation mode by the users according to the needs, the condenser heat is fully utilized, and the variable
refrigerant flow system and the control method have the beneficial effects that control is flexible, selection is diversified, energy is saved during operation, the indoor environment temperature fluctuation is small, and the comfort is high.