Carrier 48TC Instruction Manual

48TCSingle Package RooftopGas Heating/Electric Cooling Unitwith Puronr (R---410A) RefrigerantSizes: 04, 05, 06, 07Installation InstructionsNOTE: Read

104. Carefully lift the hood assembly (with metal tray)through the filter access opening and assemble per thesteps outlined in Economizer Hood and Two

11may be field converted for operation at elevations above2000 ft (610 m) and/or for use with liquefied petroleumfuel. See accessory kit installation

12EMBOSSMENTBRASS FITTINGFOR 3-6 TON UNITSSUPPORTBRACKETC08016Fig. 15 -- Gas Line Piping for 3 to 6 Ton Units OnlyOther hardware required to complete

134. Pressure--test all gas piping in accordance with localand national plumbing and gas codes before connect-ing piping to unit.NOTE: Pressure test t

14Step 12 — Make Electrical ConnectionsELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personalinjury or death.Do not use gas pi

15Units Without Factory--Installed Disconnect —When installing units, provide a disconnect switch perNEC (National Electrical Code) of adequate size.D

16Non--powered type: This type requires the fieldinstallation of a general--purpose 125--volt 15--A circuitpowered from a source elsewhere in the buil

17Units without Thru--Base Connections —1. Install power wiring conduit through side panel open-ings. Install conduit between disconnect and controlbo

18Humidi--MiZerRControl ConnectionsHumidi--MiZer – Space RH Controller —NOTE: The Humidi--MiZer is a factory installed optionwhich is only available f

19HUMIDSTATC11293Fig. 32 -- Typical Humidi--MiZerRAdaptive Dehumidification System Humidistat WiringRcRhW1GY2CO/W2/BY1OATRRSSRTNHUMD1D2V+VgX*CGW2W1Y2Y

2Smoke Detector/Fire Shutdown (FSD) 36...Connecting Discrete Inputs 36...Communication Wiring -- Protocols 37...General

20PremierLinkt (Factory--Option)C08199Fig. 34 -- PremierLink ControllerThe PremierLink controller (see Fig. 34) is compatiblewith Carrier Comfort Netw

21C11289Fig. 36 -- PremierLink Wiring Schematic48TC

22C11290Fig. 37 -- PremierLink Wiring Schematic with Humidi--MiZerR48TC

23Supply Air Temperature (SAT) Sensor —On FIOP--equipped 48TC unit, the unit is supplied with asupply--air temperature (SAT) sensor (33ZCSENSAT).This

24Table 4 – Space Sensor ModeTB1 TERMINAL FIELD CONNECTION INPUT SIGNAL1 T 5 5 --- S E N / T 5 6 --- S E N Analog (10k thermistor)2 RMTOCC Discrete, 2

25Space Sensors —The PremierLink controller is factory--shipped configuredfor Space Sensor Mode. A Carrier T--55 or T--56 spacesensor must be used. T-

26Economizer ControlsIndoor Air Quality (CO2)Sensor—The indoor air quality sensor accessory monitors spacecarbon dioxide (CO2) levels. This informatio

27Space Relative Humidity Sensor or HumidistatConnections —NOTE: The accessory space relative humidity sensor andhumidistat are not available for sing

28Filter Status Switch —This function is available only when PremierLink isconfigured for (Space) Sensor Mode.PremierLink control can monitor return f

29Communications Bus Wire Specifications: The CCNCommunication Bus wiring is field--supplied andfield--installed. It consists of shielded 3--conductor

3Horizontal Connections / EconomizerVertical Connections / EconomizerC09303Fig. 1 -- Unit Dimensional Drawing48TC

30RTU Open Control SystemThe RTU Open control is factory--mounted in the 48TCunit’s main control box, to the left of the CTB. SeeFig. 56. Factory wiri

31C11295Fig. 56 -- RTU Open System Control Wiring Diagram48TC

32C11296Fig. 57 -- RTU Open System Control Wiring Diagram with Humidi--MiZerR48TC

33Table 8 – RTU Open Controller Inputs and OutputsPOINT NAMEBACnet OBJECTNAMETYPE OF I/OCONNECTION PINNUMBER(S)DEDICATED INPUTSSpace Temp / Zone Temp

34Field ConnectionsField connections for accessory sensors and input devicesare made the RTU Open, at plugs J1, J2, J4, J5, J11 andJ20. All field cont

35Do not mount the IAQ sensor in drafty areas such as nearsupply ducts, open windows, fans, or over heat sources.Allow at least 3 ft (0.9 m) between t

36Relative Humidity Sensor(Polarized Male Connector)J4-1 or J4-4 + 24 VDC Supply VoltageJ4-2 or J4-5 (-) 4 to 20 mA Current Loop Outputto RTU-OPEN4-20

37Communication Wiring -- ProtocolsGeneral —Protocols are the communication languages spoken bycontrol devices. The main purpose of a protocol is toco

38Local AccessBACview6Handheld: The BACview6is a keypad/displayinterface used to connect to the RTU Open to access thecontrol information, read sensor

39Table 9 – LEDsThe LEDs on the RTU Open show the status of certain functionsIf this LED is on... Status is...Power RTU Open has powerRx RTU Open is r

4C09304Fig. 1 -- Unit Dimensional Drawing (cont.)48TC

40Return Air Enthalpy Sensor —Mount the return--air enthalpy sensor (33SENTSEN) inthe return--air section of the economizer. The return airsensor is w

41takes the appropriate action to shut down fans andblowers, change over air handling systems, notify the firealarm control panel, etc.The sensor uses

42Return AirSampling TubeC08129Fig. 75 -- Return Air Sampling Tube LocationCompleting Installation of Return Air Smoke Sensor:1. Unscrew the two screw

43Table 10 – Unit Wire/Fuse or HACR Breaker Sizing DataUNITNOM.V --- P h --- H zIFMTYPECOMB US TIO NFAN MOTORPOWEREXHAUSTNO C.O. or UNPWR C.O.NO P.E.

44Table 10 — Unit Wire/Fuse or HACR Breaker Sizing Data (cont)UNITNOM.V --- P h --- H zIFMTYPECOMB US TIO NFAN MOTORPOWEREXHA USTw/ PWRD C.O.NO P.E. w

45Legend and Notes for Table 10LEGEND:BRKR --- Circuit breakerCO --- Convenient outletDISC --- DisconnectFLA --- Full load ampsIFM --- Indoor fan moto

46C09302Fig. 78 -- EconoMi$er IV WiringStep 13 — Adjust Factory--Installed OptionsSmoke Detectors —Smoke detector(s) will be connected at the Controls

4748TC

48Copyright 2011 Carrier Corp. D 7310 W. Morris St. D Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 08/11Manufacturer reserves the r ight to

5INSTALLATIONJobsite SurveyComplete the following checks before installation.1. Consult local building codes and the NEC (NationalElectrical Code) ANS

6Step 2 — Plan for Sequence of Unit InstallationThe support method used for this unit will dictate differentsequences for the steps of unit installati

7CONNECTORPKG. ACCY.BCD ALTDRAINHOLEGAS POWER CONTROLACCESSORYPOWERCRBTMPWR001A011’-911/16”[551]13/4”[44.5]1’-4”[406]3/4” [19]NPTCRBTMPWR003A013/4”

8A-B0.5” (13)B-C1.0” (25)A-C1.0” (25)MAXIMUM ALLOWABLEDIFFERENCE IN. (MM)C06110Fig. 4 -- Unit Leveling TolerancesStep 5 — Field Fabricate DuctworkCabi

9PositioningonCurb—Position unit on roof curb so that the following clearancesare maintained:1/4in. (6.4 mm) clearance between theroof curb and the ba