Carrier WeatherMaker 48FC04-07 Installation Instructions Manual

19the building. Observe national and local codes when selectingwire size, fuse or breaker requirements, and disconnectswitch size and location. Route 125v power supply conduc-tors into the bottom of the utility box containing the duplexreceptacle.Unit-Powered Convenience OutletA unit-mounted transformer is factory-installed to stepdown the main power supply voltage to the unit to 115v at theduplex receptacle. This option also includes a manual switchwith fuse, located in a utility box and mounted on a bracketbehind the convenience outlet; access is through the unit’scontrol box access panel. See Fig. 29.The primary leads to the convenience outlet transformerare not factory-connected. Selection of primary power sourceis a customer option. If local codes permit, the transformerprimary leads can be connected at the line-side terminals onthe unit-mounted non-fused disconnect switch; this will pro-vide service power to the unit when the unit disconnectswitch is open. Other connection methods will result in theconvenience outlet circuit being de-energized when the unitdisconnect switch is open. See Fig. 33.Fig. 33 — Powered Convenience Outlet WiringFuse On Power TypeThe factory fuse is a Bussman “Fusetron”1 T-15,non-renewable screw-in (Edison base) type plug fuse.Test the GFCI receptacle by pressing the TEST button onthe face of the receptacle to trip and open the receptacle.Check for proper grounding wires and power line phasing ifthe GFCI receptacle does not trip as required. Press the RE-SET button to clear the tripped condition.Using Unit-Mounted Convenience OutletsUnits with unit-mounted convenience outlet circuits willoften require that two disconnects be opened to de-energizeall power to the unit. Treat all units as electrically energizeduntil the convenience outlet power is also checked andde-energization is confirmed. Observe National ElectricalCode Article 210, Branch Circuits, for use of convenienceoutlets.FACTORY-OPTION THRU-BASE CONNECTIONS(ELECTRICAL CONNECTIONS)This service connection kit consists of a 1 / 2 -in. NPT gasadapter fitting (brass), a 1/2-in. electrical bulkhead connector,and a 3/ 4-in. electrical bulkhead connector, all factory-in-stalled in the embossed (raised) section of the unit basepan inthe condenser section. The 3/ 4-in. bulkhead connector enablesthe low-voltage control wires to pass through the basepan.The 1 /2-in. electrical bulkhead connector allows the high-volt-age power wires to pass through the basepan. See Fig. 17 onpage 14.Check tightness of connector lock nuts before connectingelectrical conduits.Field-supplied and field-installed liquid tight conduit con-nectors and conduit may be attached to the connectors on thebasepan. Pull correctly rated high voltage and low voltagethrough appropriate conduits. Connect the power conduit tothe internal disconnect (if unit is so equipped) or to the exter-nal disconnect (through unit side panel). A hole must be fieldcut in the main control box bottom on the left side so the 24-vcontrol connections can be made. Connect the control powerconduit to the unit control box at this hole.UNITS WITHOUT THRU-BASE CONNECTIONS(ELECTRICAL CONNECTIONS)1. Install power wiring conduit through side panel open-ings. Install conduit between disconnect and control box.2. Install power lines to terminal connections as shown inFig. 25 on page 16.FIELD CONTROL WIRINGThe 48FC unit requires an external temperature control de-vice. This device can be a thermostat (field-supplied) or aSystemVu™ controller (available as factory-installed optionfor use on a Carrier Comfort Network® or as a stand alonecontrol) or the RTU Open Controller for Building Manage-ment Systems using non-CCN protocols (RTU Open control-ler is available as a factory-installed option only).THERMOSTATInstall a Carrier-approved accessory thermostat accordingto installation instructions included with the accessory. Forcomplete economizer function, select a two-stage coolingthermostat. Locate the thermostat accessory on a solid wall inthe conditioned space to sense average temperature inaccordance with the thermostat installation instructions. Typi-cal low-voltage connections are shown in Fig. 34.If the thermostat contains a logic circuit requiring 24vpower, use a thermostat cable or equivalent single leads ofdifferent colors with minimum of seven leads. If the thermo-stat does not require a 24v source (no “C” connection re-quired), use a thermostat cable or equivalent with minimumof six leads. Check the thermostat installation instructions foradditional features which might require additional conductorsin the cable.For wire runs up to 50 ft (15 m), use no. 18 AWG (Ameri-can Wire Gage) insulated wire [95°F (35°C) minimum]. For50 to 75 ft (15 to 23 m), use no. 16 AWG insulated wire [95°F(35°C) minimum]. For over 75 ft (23 m), use no. 14 AWG in-sulated wire [95°F (35°C) minimum]. Wire sizes larger thanno. 18 AWG cannot be directly connected to the thermostatand will require a junction box and splice at the thermostat.1. Bussman and Fusetron are trademarks of Cooper TechnologiesCompany.UNITVOLTAGECONNECTASPRIMARYCONNECTIONSTRANSFORMERTERMINALS208, 230 240 L1: RED + YELL2: BLU + GRAH1 + H3H2 + H4460 480L1: REDSplice BLU + YELL2: GRAH1H2 + H3H4575 600 L1: REDL2: GRAH1H2