22 Phased installation Installation of the VRV system can be implemented floor by floor, so that sections of the building can be put into use very quickly, or enabling the air conditioning system to be commissioned and operated in stages, rather than on final completion of the project. Installation floor by floor Under construction VRV system Flexible piping design The long piping lengths, high level differences and small refrigerant piping allows for a design with little limitations and leaving maximum space for lettable space. Example Air cooled Water cooled Total piping length 1,000 m 500 m Longest length actual (Equivalent) 165 m (190 m) 165 m (190 m) Longest length after first branch 90 m (1) 40 m (90 m (1)) Level difference between indoor and outdoor units 90 m (1) 50 m (40 m (2)) Level difference between indoor units 30 m 30 m (1) Contact your local dealer or consult technical literature for more information and restrictions (2) In case outdoor unit is located below indoor units 165m Actual piping length 40m (90m1) Level difference between indoor and outdoor units 30m Level difference between indoor units 90m piping length after first branch Wide operation range Air cooled The VRV system can be installed practically anywhere. VRV air cooled outdoor units can cool between -20°C BD and +52°C DB outdoor ambient and can be used as monovalent heating system between -25°C WB and +15.5°C WB. 52°C DB -20C° DB 15.5°C WB -25C° WB Consult the technical specifications for the specific operation range per outdoor series. Cooling mode Heating mode Water cooled Standard water cooled outdoor units operation between 10°C and 45°C for both heating and cooling. In geothermal mode, the operation range is extended to -10°C* during heating and 6°C during cooling. These units are not influenced by external conditions and function well in extreme climates. VRV-W VRV-W VRV-W Unlimited water piping length Indoor installation Heating mode water temperature Cooling mode water temperature -10°C 6°C 45°C 45°C Great design flexibility * Ethylene glycol should be added to the water when the water inlet temperature is below 5°C.
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