Carrier 50TCQD14 Installation Instructions Manual

Also see for 50TCQD: Installation instructions

Contents

16C10013Fig. 23 -- Mounting Position for Field Disconnects(up to 100A)All units except 208/230-v units are factory wired for thevoltage shown on the nameplate. If the 208/230-v unit isto be connected to a 208-v power supply, the controltransformer must be rewired by moving the black wirewith the 1/4 -inch female spade connector from the 230--vconnection and moving it to the 200-v 1/4 -inch maleterminal on the primary side of the transformer. Refer tounit label diagram for additional information.Field power wires are connected to the unit at line--sidepressure lugs at the main terminal block (TB1) or atfactory--installed option non--fused disconnect switch.Max wire size is #2 AWG (copper only). (See Fig. 25.)NOTE: TEST LEADS -- Unit may be equipped withshort leads (pigtails) on the field line connection points offthe optional disconnect switch. These leads are for factoryrun--test purposes only; remove and discard beforeconnecting field power wires to unit connection points.Make field power connections directly to line connectionpressure lugs only.FIRE HAZARDFailure to follow this warning could result inintermittent operation or performance satisfaction.Do not connect aluminum wire between disconnectswitch and furnace. Use only copper wire.(See Fig. 24.)! WARNINGCOPPERWIRE ONLYELECTRICDISCONNECTSWITCHALUMINUMWIREA93033Fig. 24 -- Disconnect Switch and UnitUnits Without Disconnect OptionUnits With Disconnect Option246135L1L2L3OptionalDisconnectSwitchDisconnect factory test leads; discard.FactoryWiring11 13 13L1 L2 L3TB1208/230-3-60460-3-60575-3-60DisconnectperNECC10015Fig. 25 -- Power Wiring ConnectionsAll Units —All field wiring must comply with the NEC and localrequirements.Size wire based on MCA (Minimum Circuit Amps) on theunit informative plate. See Fig. 25 and the unit labeldiagram for power wiring connections to the unit powerterminal blocks and equipment ground. Maximum wiresize is #2/0 AWG per pole.Provide a ground--fault and short--circuit over--currentprotection device (fuse or breaker) per NEC Article 440(or local codes). Refer to unit informative data plate forMOCP (Maximum Over--current Protection) device size.Voltage to compressor terminals during operation must bewithin voltage range indicated on unit nameplate. SeeTables 29 and 30. On 3--phase units, voltages betweenphases must be balanced within 2% and the current within10%. Use the formula shown in the legend for Tables 29and 30 (see Note 3 on page 58) to determine the percentof voltage imbalance.UNIT DAMAGE HAZARDFailure to follow this caution may result in equipmentdamage.Operation on improper line voltage or excessive phaseimbalance constitutes abuse and may cause damage toelectrical components. Such operation wouldinvalidate any applicable Carrier warranty.CAUTION!