Panasonic WU-144MF1U9E Installation Instructions - Page 8

1-5. Tubing Length Select the installation location so that the length and size of refrigerant tubing are within the allowable range shown in the figure below. 1. Main tubing length LM = LA + LB ... b 262 ft 2. Main distribution tubes LC - LH are selected according to the capacity after the distribution joint. 3. The outdoor connection main tubing (LO portion) is determined by the total capacity of the outdoor units that are connected to the tube ends. 4. Sizes of indoor unit connection tubing 1 - 40 are determined by the connection tubing sizes on the indoor units. L5 L1 H3 C L2 Balance tubing (ø3/8") LM B A LO LB LC LD LA Explanation of symbols Distribution joint (purchased separately) Ball valve (field supply) T-joint (field supply) 4 For LF extension Max. 1.3 ft For extension Max. 1.3 ft LH LG 1 T-joint tubing (header joint system) LE L3 H1 5 6 7 40 H2 Solenoid valve kit 3 2 Solidly welded shut L4 (pinch weld) Note: Do not use commercially available T-joints for the liquid tubing and parts. * Be sure to use special R410A distribution joints (CZ: purchased separately) for outdoor unit connections and tubing branches. R410A distribution joint CZ-P900PH1U (for outdoor unit) CZ-P224BH1U (for indoor unit) CZ-P680BH1U (for indoor unit) CZ-P1350BH1U (for indoor unit) Table 1-2 Ranges that Apply to Refrigerant Tubing Lengths and to Differences in Installation Heights Item Allowable tubinglength Allowable elevationdifference Allowable length of joint tubing Mark Contents Length (ft.) L1 Max. tubing length Actual length ≤ 492 Equivalent length ≤ 574 ΔL (L2 - L4) Difference between max. length and min. length from the No. 1 distribution joint ≤ 131 LM Max. length of main tubing (at max. diameter) 1, 2... 40 Max. length of each distribution tube L1+ 1+ 2... 40+ Total max. tubing length including length of each A+ B+LF+LG+LH distribution tube (only liquid tubing) ≤ 262*² ≤ 98 ≤ 984 L5 Distance between outdoor units ≤ 32 H1 When outdoor unit is installed higher than indoor unit ≤ 164 When outdoor unit is installed lower than indoor unit ≤ 131 H2 Max. difference between indoor units ≤ 49 H3 Max. difference between outdoor units ≤ 13 L3 T-joint tubing (field-supply); Max. tubing length between the first T-joint and solidly welded-shut end point ≤ 6.6 L = Length, H = Height NOTE 1: The outdoor connection main tubing (LO portion) is determined by the total capacity of the outdoor units that are connected to the tube ends. 2: If the longest tubing length (L1) exceeds 295 ft. (equivalent length), increase the sizes of the main tubes (LM) by 1 rank for the discharge tubes, suction tubes, and narrow tubes. (field supplied) 3: If the longest main tube length (LM) exceeds 164 feet, increase the main tube size at the portion before 164 ft. by 1 rank for the suction tubes and discharge tubes. (field supplied) (For the portion that exceeds 164 feet, set based on the main tube sizes (LA) listed in the table on the following page.) 8 88":@&$0J@6JOEC