Carrier 09DK Series Installation, Start-up And Service Instructions Manual

Contents

18Step 4 — Complete Electrical ConnectionsGENERAL — Verify that nameplate electrical requirementsmatch available power supply. Voltage at condenser must bewithin the minimum and maximum shown in Table 3 andphases must be balanced within 2%. Contact local power com-pany for line voltage corrections. Never operate a motor wherea phase imbalance in supply voltage is greater than 2%. Usethe following formula to determine the percentage of voltageimbalance:Example: Supply voltage is 240-3-60.AB = 243 voltsBC = 236 voltsAC = 238 voltsDetermine maximum deviation from average voltage:(AB) 243 – 239 = 4 volts(BC) 239 – 236 = 3 volts(AC) 239 – 238 = 1 voltMaximum deviation is then 4 volts. To determine the percent-age of voltage imbalance:This amount of phase imbalance is satisfactory since it isbelow the maximum allowable of 2%.Condenser operation on improper line voltage or excessivephase imbalance may be considered abuse and any resultingdamage may not be covered by Carrier warranty.All wiring must be in accordance with NEC (National Elec-trical Code, U.S.A.) regulations or local codes.CONNECTIONS — Refer to Table 3 and Fig. 21.Install a field-supplied disconnect capable of being lockedat OFF position.POWER WIRING — Install field-supplied branch circuitfused disconnect(s) of a type that can be locked OFF or OPEN.Disconnect(s) must be within sight from and readily accessiblefrom unit in compliance with NEC Article 440-14 (U.S.A.) orlocal code.GENERAL WIRING NOTES1. The control circuit field supply disconnect shouldnever be open except when unit is being serviced or isto be down for a prolonged period.2. Power entry is at one end only.3. Terminals for field power supply are suitable for cop-per, copper-clad aluminum, or aluminum conductors.Insulation must be rated 60 C minimum.4. Field power supply wires based on minimum 26 Cambient temperature air are 8 AWG (American WireGage) for Models 09DK034, 044 (208/230-3-60,230-3-50), 12 AWG for all other models.5. Connect field power wires to factory-supplied 8 AWGwire from contactor with factory-supplied nut.6. Route field wiring through factory-supplied wire tiesand base rail holes. See Fig. 3-5.7. Control circuit power is as follows:NOTE: Use 14 AWG (American Wire Gage) copper conductors onlyfor control circuit wiring.Step 5 — Add Accessories as Needed —Accessories include fan cycling head-pressure control, winterstart control, fan cycling, and electrical interlock. Refer toinstallation instructions furnished with each accessory.START-UPSystem Evacuation and Dehydration — Refer toGTAC II, Module 4, “Dehydration for Proper Evacuation andDehydration techniques.”Charging Procedure — BEFORE CHARGING THESYSTEM, INSTALL OR REPLACE THE FILTER-DRIER(S) CONNECTED TO THE LIQUID LINE WITHINTHE IN-DOOR UNIT(S) TO PREVENT CONTAMINA-TION WITHIN THE SYSTEM. Charge to a clear sight glass.Refer to GTAC II, Module 5 “Charging, Recovery, Recycling,and Reclamation” and Carrier Refrigerant Service Techniquesmanual for proper charging techniques. Add 10 lbs (4.5 kg) ofR-22 over clear sight glass to flood subcooler sections of thecondenser coils. See Table 4 for charging data.Check Operation of Condenser Fan MotorControls and Rotation of Fans — Rotation shouldbe counterclockwise as viewed from top of unit.% VoltageImbalance = 100 xmax voltage deviationfrom average voltageAverage voltageAverage Voltage = 243 + 236 + 2383= 7173= 239 volts% Voltage Imbalance = 100 x 4239= 1.7%IMPORTANT: If supply voltage phase imbalance ismore than 2%, contact your local electric utilitycompany immediately.CONTROL CIRCUITV-HzPOWERSUPPLY V-Hz220-60 380-60230-50 230-50400-50115-60208/230-60460-60575-60Before starting unit, be sure wire fan guards are secured inplace over each fan.