Daikin FXZQ-MVE Introduction Manual

Contents

Daikin FXZQ-MVE Introduction Manual Manual pdf 30 page image

17• Systems • Introduction 29• Introduction7 Selection procedure7-2 Capacity correction ratio7-2-1 RXYQ5MY1B• Rate of change in cooling capacity • Rate of change in heating capacity3D040052NOTES1 These figures illustrate the rate of change in capacity of a standard indoor unit system at maximum load (with the thermostat set to maximum)under standard conditions.Moreover, under partial load conditions there is only a minor deviation from the rate of change in capacity shown in the above figures.2 With this outdoor unit, evaporating pressure constant control when cooling, and condensing pressure constant control when heating is carried out.3 Method of calculating cooling / heating capacity (max. capacity for combination with standard indoor unit)cooling / heating capacity = cooling / heating capacity obtained from performance characteristics table x each capacity rate of changeWhen piping length differs depending on the indoor unit, maximum capacity of each unit during simultaneous operation is:cooling / heating capacity = cooling / heating capacity of each unit x capacity rate of change for each piping length4 When overall equivalent pipe length is 90m or more, the diameter of the main gas pipes (outdoor unit-branch sections) must be increased.5 When the main sections of the interunit gas pipe diameters are increased the overall equivalent length should be calculated as follows.Overall equivalent length = Equivalent length to main pipe x 0.5 + Equivalent length after branchingExampleIn the above case (Cooling)Overall equivalent length = 80m x 0.5 + 40m = 80mThe correction factor in capacity when H p = 0m is thus approximately 0.78EXPLANATION OF SYMBOLSH p : Level difference (m) between indoor and outdoor units with indoor unit in inferior positionH M : Level difference (m) between indoor and outdoor units with indoor unit in superior positionL : Equivalent pipe length (m)α : Capacity correction factorDiameter of above caseModel gasRXYQ5MY1B ø 19.1Diameter of gas pipesModel gasRXYQ5MY1B ø 15.9Equivalent lenght Equivalent lenghtIndoor unitOutdoor unit BranchSize increase80 m 40 m