Panasonic U-72MF1U9 Installation Instructions Manual

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Panasonic U-72MF1U9 Installation Instructions Manual Manual pdf 18 page image

181-15. Example of Tubing Size Selection and Refrigerant Charge AmountAdditional refrigerant chargingBased on the values in Tables 1-3, 4, 5, 9 and 10-2 use the liquid tubing size and length, and calculate the amount of additionalrefrigerant charge using the formula below.Required additionalrefrigerant charge (oz) = 3.93 × (a) + 2.78 × (b) + 1.99 × (c) + 1.38 × (d) + 0.602 × (e) + 0.279 × (f) + Necessary amount ofadditional refrigerant charge per outdoor unit(a) : Liquid tubing Total length of ø7/8" (ft.) (d) : Liquid tubing Total length of ø1/2" (ft.)(b) : Liquid tubing Total length of ø3/4" (ft.) (e) : Liquid tubing Total length of ø3/8" (ft.)(c) : Liquid tubing Total length of ø5/8" (ft.) ( f ) : Liquid tubing Total length of ø1/4" (ft.)● Charging procedureBe sure to charge with R410A refrigerant in liquid form.1. After performing a vacuum, charge with refrigerant from the liquid tubing side. At this time, all valves must be in the “fullyclosed” position.2. If it was not possible to charge the designated amount, operate the system in Cooling mode while charging with refrigerantfrom the gas tubing side. (This is performed at the time of the test run. For this, all valves must be in the “fully open” position.However if only one outdoor unit is installed, a balance tube is not used. Therefore, leave the valves fully closed.)Charge with R410A refrigerant in liquid form.With R410A refrigerant, charge while adjusting the amount being fed a little at a time in order to prevent liquid refrigerant frombacking up.● After charging is completed, turn all valves to the “fully open” position.● Replace the tubing covers as they were before.CAUTION1. R410A additional charging absolutelymust be done through liquid charging.2. The R410A refrigerant cylinder has a graybase color, and the top part is pink.3. The R410A refrigerant cylinder includes asiphon tube. Check that the siphon tube ispresent. (This is indicated on the label atthe top of the cylinder.)4. Due to differences in the refrigerant,pressure, and refrigerant oil involved ininstallation, it is not possible in somecases to use the same tools for R22 andfor R410A.1 2 3 4LALB LCABOutdoor unit96 type 96 type48 type 48 type 48 type 36 typeExample:● Example of each tubing lengthMain tubing Distribution joint tubingLA = 131 ft. Outdoor side Indoor sideLB = 16 ft. A = 7 ft. 1 = 98 ft.LC = 16 ft. B = 7 ft. 2 = 16 ft.3 = 16 ft.4 = 65 ft.Balance tubeLiquid tubeDischarge tube Suction tubeUse a hex wrench (width 5/32 inch)and turn to the left to open.Use a flathead screwdriverand open by turning the partwith the screw groove to theright, from “ ” to “ ”Use a flathead screwdriverand open by turning the partwith the screw groove to theright, from “ ” to “ ”Use a flathead screwdriverand open by turning the partwith the screw groove to theright, from “ ” to “ ”