Carrier 50TJ016-028 Installation, Start-up And Service Instructions Manual

Also see for 50TJ016-028: Installation, Start-Up and Service Instructions Installation, Start-Up and Service Instructions

Contents

9Step 6 — Make Electrical ConnectionsFIELD POWER SUPPLY — Unit is factory wired for volt-age shown on nameplate. Units are provided with terminalblock.When installing units, provide a disconnect of adequate sizeper local ordinances and codes (see Table 2).All field wiring must comply with local requirements.Route power lines through control box end panel or unitbasepan (Fig. 4 and 5) to terminal connections as shown onunit wiring diagram and Fig. 11.Operating voltage to compressor must be within voltagerange indicated on unit nameplate. Voltages between phasesmust be balanced within 2% and the current must be balancedwithin 10%.Use the following formula to determine the percent voltageimbalance.Example: Supply voltage is 400-3-50.AB = 393 vBC = 403 vAC = 396 v= 397Determine maximum deviation from average voltage:(AB) 397 – 393 = 4 v(BC) 403 – 397 = 6 v(AC) 397 – 396 = 1 vMaximum deviation is 6 v.Determine percentage of voltage imbalance:This amount of phase imbalance is satisfactory as it is be-low the maximum allowable 2%.Unit failure as a result of operation on improper line voltageor excessive phase imbalance constitutes abuse and may causedamage to electrical components.FIELD CONTROL WIRING — Install a Carrier-approvedaccessory thermostat assembly according to the installation in-structions included with the accessory. Locate thermostatassembly on a solid wall in the conditioned space to sense aver-age temperature.Route thermostat cable or equivalent single leads of1.0 mm2 (no. 18 AWG [American Wire Gage, U.S.A.]) col-ored wire from subbase terminals through conduit in unit tolow-voltage connections as shown on unit label wiring diagramand in Fig. 12.NOTE: For wire runs up to 15 m (50 ft), use 1.0 mm2 (no. 18AWG) insulated wire (35 C minimum). For 15 to 23 m (50 to75 ft), use 1.5 mm2 (no. 16 AWG) insulated wire (35 C mini-mum). For over 23 m (75 ft), use 2.5 mm2 (no. 14 AWG) insu-lated wire (35 C minimum). All wire larger than 1.0 mm2(no. 18 AWG) cannot be directly connected to the thermostatand will require a junction box and splice at the thermostat.See Table 3 for American/European wire conversions.Set heat anticipator settings as indicated in Table 4. Settingsmay be changed slightly to provide a greater degree of comfortfor a particular installation.The correct power phasing is critical in the operation of thescroll compressors. An incorrect phasing will cause thecompressor to rotate in the wrong direction. This may leadto premature compressor failure.= 100 x max voltage deviation from average voltageaverage voltageAverage Voltage = 393 + 403 + 3963= 11923% Voltage Imbalance = 100 x 6397= 1.5%IMPORTANT: If the supply voltage phase imbalance ismore than 2%, contact your local electric utility companyimmediately.Fig. 10 — Condensate Drain Piping DetailsRH RC Y1 Y2 W1 W2 G C XLXCGW2W1Y2Y1RREMOVABLE JUMPERREDBLUPNKORNVIOBLKBRNWHTTHERMOSTAT ASSEMBLYLEGENDNOTE: The maximum wire size for TB1 is 70 mm 2 (2/0 AWG).Fig. 11 — Field Power Wiring ConnectionsAWG — American Wire GageEQUIP — EquipmentGND — GroundTB — Terminal BlockUNIT LOW VOLTAGE CONNECTIONSFig. 12 — Field Control Thermostat Wiring