Carrier GEMINI SELECT 38APD025-100 Installation Instructions Manual

Also see for GEMINI SELECT 38APD025: Installation instructions Manual Operating and service guide

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Carrier GEMINI SELECT 38APD025-100 Installation Instructions Manual Manual pdf 17 page image

17Step 3 — Make Refrigerant PipingConnectionsThe units have large suction lines to minimize friction loss-es. The units also have the ability to operate at low capacity.Because of these capabilities, use special care with suction pip-ing and suction risers to ensure proper compressor oil returnunder all operating conditions. If the evaporator is above thecondensing unit, the maximum allowable vertical separationbetween the condensing unit and the evaporator is 75 ft(22.9 m) for all units. Size suction lines in accordance withTable 7 and Fig. 12.SIZE REFRIGERANT LINES — Consider the length of pip-ing required between the condensing unit and indoor unit(evaporator), the amount of liquid lift, and compressor oil re-turn. Suction and liquid lines should be sized in accordancewith Table 7. Double suction risers may be required if con-densing unit is located above the evaporator to assure properoil return at minimum load operating conditions. See Table 7and Fig. 12. Note the indoor unit installtion instructions for ad-ditional information.CAUTIONDo NOT bury refrigerant piping underground. Failure tocomply could result in equipment damage.CAUTIONThe field-supplied liquid line solenoid valve must beinstalled at the evaporator to avoid possible compressordamage during unit operation if the maximum allowableevaporator size is exceeded per Table 8. See Fig. 13 (for38APD025-100 dual-circuit units), or Fig. 14 (for38APS025-050 single-circuit units).Fig. 12 — Double Suction Riser ConstructionLEGENDNOTES:1. Short riser, pipe D, is used when routing suction line tocondensing unit connection. See table at right.2. See Table 7 for values of A, B, and C.A — Pipe A, Suction Riser, without TrapB — Pipe B, Suction Riser with TrapC — Suction Line to Condensing UnitD — Pipe D, Suction Riser Short LiftRED. — ReducerSTR — Street38APUNITSIZED PIPE DIAMETERDual Circuit Single CircuitCircuit A Circuit Bin. mm in. mm in. mm025 1 1 / 8 29 1 1 / 8 29 1 3 / 8 35027 1 1 / 8 29 1 1 / 8 29 1 3 / 8 35030 1 1 / 8 29 1 1 / 8 29 1 3 / 8 35040 1 3 / 8 35 1 1 / 8 29 1 5 / 8 41050 1 3 / 8 35 1 3 / 8 35 1 5 / 8 41060 1 3 / 8 35 1 5 / 8 41 — —070 1 5 / 8 41 1 5 / 8 41 — —080 1 5 / 8 41 1 5 / 8 41 — —090 1 5 / 8 41 1 5 / 8 41 — —100 1 5 / 8 41 1 5 / 8 41 — —a38-7132