Carrier Infinity 48XL Installation Instructions Manual

Also see for Infinity 48XL: Owner's information manual

Contents

Carrier Infinity 48XL Installation Instructions Manual Manual pdf 12 page image

Table2- MaximumGas Flow Capacity*NOMINAL INTERNAL LENGTH OF PIPE ft (m)'{"IRON PIPE DIAMETER 10 20 30 40 50 60 70 80 90 100 125 150 175 200SIZE (IN.) (IN.) (3.0) (6.1) (9.1) (12.1) (15.2) (18.3) (21.3) (24.4) (27.4) (30.5) (38.1) (45.7) (53.3) (61.0)1/2 .622 175 120 97 82 73 66 61 57 53 50 44 40 -- --3/4 .824 360 250 200 170 151 138 125 118 110 103 93 84 77 721 1.049 680 465 375 320 285 260 240 220 205 195 175 160 145 1351 - 1/4 1.380 1400 950 770 600 580 530 490 460 430 400 360 325 300 2801 - 1/2 1.610 2100 1460 1180 990 900 810 750 690 650 620 550 500 460 430*Capacity of pipe in cu ft of gas per hr for gas pressure of 0.5 psig or less. Pressure drop of 0.5-IN. W.C. (based on a 0.60 specific gravity gas). Refer to Table,NFPA 54/ANSI Z223,1.1- This length includes an ordinary number of fittings.ROUTING POWER LEADS INTO UNITUse only copper wire between disconnect and unit. The highvoltage leads should be in a conduit until they enter the duct panel;conduit termination at the duct panel must be watertight. Run thehigh-voltage leads through the power entry knockout on thepower entry side panel. See Fig. 5 and 6 for location and size. Forsingle-phase units, connect leads to the black and yellow wires.CONNECTING GROUND LEAD TO GROUND SCREWConnect the ground lead to the chassis using the ground screw onthe control plate near the inducer switch (See Fig. 13).ROUTING CONTROL POWER WIRESFor detailed instruction on the low voltage connections to the UserInterface (UI), refer to the UI installation guide.Form a drip-loop with the control leads before routing them intothe unit. Route the low voltage control leads through grommeted,low-voltage hole provided into unit (See Fig. 5 and 6). Connectuser interface leads to unit control power leads as shown in Fig. 14.The unit transformer supplies 24-v power for complete systemincluding accessory electrical heater. Transformer is factory wiredfor 230-v operation. If supply voltage is 208-v, rewire transformerprimary as described in Special Procedures for 208-v Operationsection.The furnace board is fused by a board-mounted automotive fuseplaced in series with transformer SEC1 and R circuit. The C circuitof transformer circuit is referenced to chassis ground through aprinted circuit run at SEC2 and gas valve grounding wire. Check tobe sure control board is mounted securely using bothfactory-installed screws.ACCESSORY INSTALLATIONA. Outdoor Air Thermistor (OAT)EQUIPMENT OPERATION HAZARDThe installation of an outdoor temperature sensor using theInfinity control board OAT terminals is required. ManyInfinity features (auto humidity control, comfort rollback,ETC.) will be lost if the OAT is not connected.For detailed mounting instructions for the OAT sensor,please refer to TSTATXXSEN01-B installation instructions(catalog no. 63TS-TAI3): Procedures 1 through 3.The OAT input is used to supply outdoor temperature data forsystem level functions and for temperature display on UserInterface (UI). Using two wires of the field-supplied thermostatwire cable, wire the ends of the two black OAT pigtails. Wire theopposite ends of these two wires to the OAT provided with the UI.There is no polarity to be observed.NOTE: Mis-wiring OAT inputs will not cause damage to eitherInfinity control or thermistor. If the thermistor is wired incorrectly,no reading will appear at UI. Re-wire thermistor correctly fornormal operation.B. Humidifier ConnectionsThe furnace control board terminal marked HUM is provided forlow voltage (24-vac) control of a humidifier. No humidistat isrequired as UI monitors indoor humidity.When commanded to operate humidifier, the unit control willenergize the HUM output to turn humidifier on and de-energizeHUM output to turn humidifier off. Wire HUM and COMterminals directly to humidifier as shown in Fig. 14.C. Electronic Air CleanerElectronic Air Cleaner terminals are provided on the InfinityControl Board (EAC-I and EAC-2). While these terminals can beused to power a 230V EAC, it is recommended that any EAC beinstalled per the EAC installation instructions and connectedseparately to a standard II5V or 230V outlet with an airflowsensor to control operation of the EAC.SPECIAL PROCEDURES FOR 208-V OPERATIONBe sure unit disconnect switch is open.Disconnect the black primary lead from the transformer. See unitwiring label (See Fig. 16 and 17).Connect the black primary lead to the transformer terminal labeled208-v.12