Carrier 50TCQA Installation Instructions Manual

Also see for 48TC*D: Service and maintenance instructions Installation instructions

Contents

44Legend and Notes for Table 10LEGEND:CO --- Convenient outletDISC --- DisconnectFLA --- Full load ampsIFM --- Indoor fan motorLRA --- Locked rotor ampsMCA --- Minimum circuit ampsMOCP --- Maximum over current protectionPE --- Power exhaustUNPWR CO --- Unpowered convenient outletNOTES:1. In compliance with NEC requirements for multimotor andcombination load equipment (refer to NEC Articles 430 and440), the overcurrent protective device for the unit shall befuse or HACR breaker. Canadian units may be fuse or circuitbreaker.2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supplyvoltage is greater than 2%. Use the following formula to de-termine the percentage of voltage imbalance.% Voltage Imbalance = 100 xmax voltage deviation from average voltageaverage voltageExample: Supply voltage is 230-3-60AB = 224 vBC = 231 vAC = 226 vAverage Voltage = (224 + 231 + 226) = 6813 3= 227Determine maximum deviation from average voltage.(AB) 227 – 224 = 3 v(BC) 231 – 227 = 4 v(AC) 227 – 226 = 1 vMaximum deviation is 4 v.Determine percent of voltage imbalance.% Voltage Imbalance = 100 x 4227= 1.76%This amount of phase imbalance is satisfactory as it is below themaximum allowable 2%.IMPORTANT: If the supply voltage phase imbalance is more than2%, contact your local electric utility company immediately.Economizer 2 Position Damper Unit Without Economizer or2 Position DamperC08631Fig. 65 -- EconoMi$ert IV WiringStep 11 — Adjust Factory--Installed OptionsSmoke Detectors —Smoke detector(s) will be connected at the CentralTerminal Board (CTB), at terminals marked “SmokeShutdown”. Remove jumper JMP 3 when ready toenergize unit.EconoMi$er IV Occupancy Switch —Refer to Fig. 65 for general EconoMi$er IV wiring.External occupancy control is managed through aconnection on the Central Terminal Board.If external occupancy control is desired, connect a timeclock or remotely controlled switch (closed for Occupied,open for Unoccupied sequence) at terminals markedOCCUPANCY on CTB. Remove or cut jumper JMP 2 tocomplete the installation.50TCQA