Carrier WeatherMaker 48TC Series Installation Instructions Manual

Contents

30Unit-powered typeA unit-mounted transformer which is factory-installed to step-down the main power supply voltage to the unit to 115-v at the du-plex receptacle. This option also includes a manual switch withfuse, located in a utility box and mounted on a bracket behind theconvenience outlet; access is through the unit’s control box accesspanel. See Fig. 38.The primary leads to the convenience outlet transformer are notfactory-connected. If local codes permit, the transformer primaryleads can be connected at the line-side terminals on the unit-mounted non-fused disconnect switch; this will provide servicepower to the unit when the unit disconnect switch is open. SeeFig. 38. See Fig. 39 for convenience outlet utilization precautions.Fig. 38 — Powered Convenience Outlet Wiring.Fig. 39 — Convenience Outlet Utilization NoticeTest the GFCI receptacle by pressing the TEST button on the faceof the receptacle to trip and open the receptacle. Check for propergrounding wires and power line phasing if the GFCI receptacledoes not trip as required. Press the RESET button to clear thetripped condition.Using unit-mounted convenience outlets: Units with unit-mountedconvenience outlet circuits will often require that two disconnectsbe opened to de-energize all power to the unit. Treat all units aselectrically energized until the convenience outlet power is alsochecked and de-energization is confirmed. Observe National Elec-trical Code Article 210, Branch Circuits, for use of convenienceoutlets.FACTORY-OPTION THRU-BASE CONNECTIONS (ELEC-TRICAL CONNECTIONS)All units are equipped with the ability to bring utilities through thebase.Gas is brought up through an embossed area located in the gassection behind the gas entrance post. Access is gained through thegas access panel. A knock out must be removed to accomplishthis.The electrical entrance is located in the control box area and canbe accessed through the control box access panel. An embossedarea is provided with three knock outs. High voltage is broughtthrough the multi knock out by removing the appropriate size forthe size of the fitting required. A 7/8-in. knock out is provided forlow voltage. An additional 7/8-in. knock out is provided for a 115volt line which is used when the unit is equipped with the non-unitpowered convenience outlet option.All required fittings are field supplied. Install fittings when accessto both top and bottom of the base pan is available. See electricaland gas connections for routing and connection information.Units Without Thru-Base Connections1. Install liquid tight conduit between disconnect and controlbox.2. Pull correctly rated high voltage wires through the conduit.3. Install power lines to terminal connections as shown inFig. 35.Field Control WiringThe 48TC unit requires an external temperature control device.This device can be a thermostat (field-supplied) or a PremierLinkcontroller (available as factory-installed option or as field-installedaccessory, for use on a Carrier Comfort Network or as a standalone control) or the RTU Open for Building Management Sys-tems using non-CCN protocols (RTU Open is available as a facto-ry-installed option only).ThermostatInstall a Carrier-approved accessory 2-stage thermostat accordingto installation instructions included with the accessory. Locate thethermostat accessory on a solid wall in the conditioned space tosense average temperature in accordance with the thermostat in-stallation instructions.If the thermostat contains a logic circuit requiring 24-v power, usea thermostat cable or equivalent single leads of different colorswith minimum of seven leads. If the thermostat does not require a24-v source (no “C” connection required), use a thermostat cableor equivalent with minimum of six leads. Check the thermostat in-stallation instructions for additional features which might requireadditional conductors in the cable.For wire runs up to 50 ft (15 m), use no. 18 AWG (American WireGage) insulated wire (35°C minimum). For 50 to 75 ft (15 to23 m), use no. 16 AWG insulated wire (35°C minimum). For over75 ft (23 m), use no. 14 AWG insulated wire (35°C minimum). Allwire sizes larger than no. 18 AWG cannot be directly connected tothe thermostat and will require a junction box and splice at thethermostat.Unit Without Thru-Base Connection KitCorrectly rated low voltage wire can be routed through the rubbergrommet located on the corner post adjacent to the control box ac-cess panel. Route wire through the grommet and then route thewire behind the corner post utilizing the factory provided wire tiessecured to the control box. This will ensure separation of the fieldUNITVOLTAGECONNECTASPRIMARYCONNECTIONSTRANSFORMERTERMINALS208, 230 240 L1: RED+YELL2: BLU+GRAH1+H3H2+H4460 480L1: REDSplice BLU+YELL2: GRAH1H2+H3H4575 600 L1: REDL2: GRA H1H22.050HE501288NOTICE/AVISConvenience Outlet UtilizationMaximum Intermittent Use 15 - AmpsMaximum Continuous Use 8 - AmpsObserve a 50% limit on the circuitLoading above 8 - AmpsUtilisation de la prise utilitaireUsage intermittent maximum 15 - AmpsUsage continu maximum 8 - AmpsObservez une limite de 50% sur le circuitChargement au-dessus de 8 - Amps