Carrier WeatherMaker 48TC Series Installation Instructions Manual

Contents

28UNITS WITH FACTORY-INSTALLED NON-FUSEDDISCONNECTWhen installing units, provide a disconnect switch per NEC (Na-tional Electrical Code) of adequate size. Disconnect sizing datais provided on the unit informative plate. Locate on unit cabinetor within sight of the unit per national or local codes. Do notcover unit informative plate if mounting the disconnect on theunit cabinet.UNITS WITH FACTORY-INSTALLED NON-FUSEDDISCONNECTThe factory-installed option non-fused disconnect switch (NFD) islocated in the main control box. The manual switch handle andshaft are shipped in the control box and must be mounted on thecorner post adjacent to the control box (see Fig. 34). Note that thetape covering the hole for the shaft in the corner post must be re-moved prior to handle and shaft installation.TO FIELD INSTALL THE NFD SHAFT AND HANDLE:1. Open the control box panel.2. Make sure the NFD shipped from the factory is at OFF posi-tion (the arrow on the black handle knob or on the silvermetal collar is at OFF).3. Insert the shaft with the cross pin on the top of the shaft in thehorizontal position.4. Measure the tip of the shaft to the outside surface of the cor-ner post to be 0.88 in.5. Tighten the locking screw to secure the shaft to the NFD.6. Turn the handle to OFF position with red arrow pointing atOFF.7. Install the handle on to the corner post vertically with the redarrow pointing up.8. Secure the handle to the corner post with (2) screws and lockwashers supplied.Fig. 34 — Handle and Shaft Assembly for NFDALL UNITSAll field wiring must comply with NEC and all local coderequirements.Size wire based on MCA (Minimum Circuit Amps) on the unit in-formative plate. See Fig. 35 for power wiring connections to theunit power terminal block and equipment ground. Maximum wiresize is 2/0 AWG per pole.Provide a ground-fault and short-circuit over-current protectiondevice (fuse or breaker) per NEC Article 440 (or local codes). Re-fer to unit informative data plate for MOCP (Maximum Over-cur-rent Protection) device size.Voltage to compressor terminals during operation must be withinvoltage range indicated on unit nameplate. On 3-phase units, volt-ages between phases must be balanced within 2% and the currentwithin 10%. Use the formula shown below to determine the per-cent of voltage imbalance.% Voltage Imbalance:= 100 x max voltage deviation from average voltageaverage voltage