Panasonic R410A: 5/16 Installation Instructions Manual

Panasonic R410A: 5/16 Installation Instructions Manual Manual pdf 14 page image

1-13. Example of Tubing Size Selection and Refrigerant Charge Amount1 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.CAUTION1. R410A additional charging absolutely mustbe 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 at thetop of the cylinder.)4. Due to differences in the refrigerant, pres-sure, and refrigerant oil involved in installa-tion, it is not possible in some cases to usethe same tools for R22 and for R410A.Balance tubeLiquid tubeGas tubeUse a flathead screwdriver andopen by turning the part with thescrew groove to the right,from “–” to “|”.Use a flathead screwdriver andopen by turning the part with thescrew groove to the right,from “–” to “|”.Use a hex wrench (width 5/32 inch)and turn to the left to open.14Additional refrigerant chargingBased on the values in Tables 1-3, 4, 5, 7, 10-1 and 10-2, use the liquid tubing size and length, and calculate the amount of addi-tional refrigerant charge using the formula below.= Necessary Amount of Additional Refrigerant Charge Per Outdoor Unit+ 3.93 × (a) + 2.78 × (b) + 1.99 × (c) + 1.38 × (d) + 0.602 × (e) + 0.279 × (f)Required additionalrefrigerant charge (oz)(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.