VRV IV for continuous comfort, also during defrost
Because the VRV IV continues to provide heating even when in defrost mode, it provides the answer to any perceived disadvantages of specifying a heat pump for monovalent heating.
Heat pumps are known for their high energy efficiency in heating, but they accumulate ice during heating operation and this must be melted periodically using a defrost function that reverses the refrigeration cycle. This causes a temporary temperature drop and reduced comfort levels inside the building.
Defrosting can take over 10 minutes (depending on the size of the system) and occurs most frequently between -7 and +7°C when there is most humidity in the air, which freezes to the coil, and this has a significant impact on the perceived indoor comfort levels.
The VRV IV has changed the heating pardigm by providing heat even during defrost operation thus eliminating the temperature drop inside and providing comfort at all times.