Carrier 38AUZ*07 Series Installation, Start-up And Service Instructions Manual

Contents

10Table 4 – 38AUD 15-25 Piping Recommendations (Two-Circuit Unit)SINOTE: 38AUD requires TWO sets of refrigeration pipingR-410A EquivalentLength m 0-12 12-23 23-34 34-46 46-57Model LinearLength m 0--- 7.5 7.5--- 15 15--- 23 23--- 30 30--- 3838AUD*16 Liquid Line 3 / 8 3 / 8 3 / 8 1 / 2 3 / 8 1 / 2 1 / 2Max Lift 7.5 15 22 23 13 30 38Suction Line 7 / 8 7 / 8 11 / 8 11 / 8 11 / 8Charge (kg) A/B 5.9 6.3 7.0 8.0 7.5 8.9 9.838AUD*25 Liquid Line 1 / 2 1 / 2 1 / 2 1 / 2 5 / 8 1 / 2 5 / 8Max Lift 7.5 15 23 20 28 23 33Suction Line 7 / 8 11 / 8 11 / 8 11 / 8 13 / 8Charge (kg) A/B 9.4 10.3 11.2 12.1 13.8 13.0 15.1EnglishNOTE: 38AUD requires TWO sets of refrigeration pipingR-410A EquivalentLengthft 0--- 12 38--- 75 75--- 113 113--- 150 150--- 188m 0--- 7.5 7.5--- 15 15--- 23 23--- 30 46-57Model LinearLength ft 0--- 25 25--- 50 50--- 75 75--- 100 100--- 12538AUD*16 Liquid Line 3 / 8 3 / 8 3 / 8 1 / 2 3 / 8 1 / 2 1 / 2Max Lift 25 50 71 75 43 100 125Suction Line 7 / 8 7 / 8 11 / 8 11 / 8 11 / 8Charge (lbs) A/B 12.9 13.9 15.4 17.7 16.5 19.6 21.638AUD*25 Liquid Line 1 / 2 1 / 2 1 / 2 1 / 2 5 / 8 1 / 2 5 / 8Max Lift 7.5 15 23 20 28 23 33Suction Line 7 / 8 11 / 8 11 / 8 11 / 8 13 / 8Charge (lbs) A/B 20.7 22.8 24.7 26.6 30.4 28.6 33.3Legend:Equiv Length Equivalent tubing length, including effects of refrigeration specialties devicesLinear Length Typical linear tubing length, (50% added to linear to define Equivalent Length for this table)Liquid Line Tubing size, inches OD.Max Lift Maximum liquid lift (indoor unit ABOVE outdoor unit only), at maximum permitted liquid line pressure drop —S Linear Length Less than 30 m (100 ft): Minimum 1.1°C (2.0°F) subcooling entering TXVS Linear Length Greater than 30 m (100 ft): Minimum 0.3°C (0.5°F) subcooling entering TXVSuction Line Tube size, inches ODCharge Charge Quantity, kg (lbs). Calculated for both liquid line sizes (where applicable), but only with larger suction line size(where applicable)NOTE: For applications with equivalent length greater than 57 m (188 ft) and/or linear length greater than 38 m (125 ft),contact your local Carrier representative.Table 5 – 38AUD Maximum Suction Pipe SizeModel: Unit Size Maximum Tube Size38AUD16 15 / 825 15 / 8INSULATE SUCTION LINES — Apply closed-celltubular insulation to all suction lines between evaporatorcoil connection and 38AUD unit’s suction service valve.Hot Gas Bypass — Hot gas bypass, if used, should beintroduced before the evaporator. (A bypass route that alsobypasses the evaporator circuit may lead to oil trapping inthe evaporator circuit during low load conditions and thento oil slugging as evaporator load increases.) Model38AUD units do not include a hot gas stub connection; atee must be field-supplied and installed in the compressordischarge line. Run a 1 / 2 -in OD line between outdoor unitand evaporator coil inlet. Install an Auxiliary SideConnector at the evaporator between TXV and distributor(follow instructions for the side connector part). Insulatethe hot gas line.38AUD