Carrier 50TCQD14 Installation Instructions Manual

Also see for 50TCQD: Installation instructions

Contents

58Step 1 Step 2 Step 3C12283Fig. 79 -- Completing Installation of Return Air Smoke SensorLegend and Notes for Tables 29 and 30LEGEND:BRKR --- Circuit breakerC.O. --- Convenience outletDISC. --- DisconnectFLA --- Full load ampsLRA --- Locked rotor ampsMCA --- Minimum circuit ampsP.E. --- Power exhaustPwrd fr/ unit --- Powered from unitPWRD C.O. --- Powered convenience outletUNPWR C.O. --- Unpowered convenience outletNOTES:1. In compliance with NEC requirements for multimotor and combination loadequipment (refer to NEC Articles 430 and 440), the overcurrent protective devicefor the unit shall be fuse or HACR breaker. Canadian units may be fuse or circuitbreaker.2. For 208/230 v units, where one value is shown it is the same for either 208 or230 volts.3. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supply voltage is greaterthan 2%. Use the following formula to determine the percentage of voltageimbalance.% 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 x4227= 1.76%This amount of phase imbalance is satisfactory as it is below the maximumallowable 2%.IMPORTANT: If the supply voltage phase imbalance is more than 2%, contactyour local electric utility company immediately.