Carrier 48MPD Installation, Start-up And Service Instructions Manual

Contents

Control Wiring — See Fig. 13 for sensor wiring con-nections to main and auxiliary control boxes. The recom-mended types of control wiring for 48/50MP unit devicesare shown in Table 6.Table 6 — Recommended Sensor andDevice Non-Shielded CableMANUFACTURER PART NO.Regular Wiring Plenum WiringAlpha 1895 —American A21451 A48301Belden 8205 884421Columbia D6451 —Manhattan M13402 M64430Quabik 6130 —SENSORS — Sensors should be wired using single twistedpairs of 20 AWG (American Wire Gage) conductor cable ratedfor the application, except for the T56 accessory sensor whichrequires 3-conductor cable.NOTE: Humidity and CO 2 sensors must be powered fromisolated 24-v power supplies.HUMIDITY CONTROL AND HOT WATER AND STEAMVALVES — These devices require 20 AWG twisted pair con-ductor cables rated for the application for the 4 to 20 mAsignal.SPACE TEMPERATURE SENSOR (T55) — The space tem-perature sensor (P/N CEC0121448-01) is shipped standardwith every unit, and is located in the main control box. Spacetemperature sensor wires are to be connected to terminals inthe unit main control box. The space temperature sensorincludes a terminal block (TB1), a jumper between pins E2and E3, and an RJ11 female connector. The RJ11 connectoris used to tap into the Carrier Comfort Network (CCN) atthe sensor. See RJ11 Plug Wiring section on page 24 to con-nect the RJ11 connector to the CCN. A 3-lead cable mustrun from the RJ11 connector to the unit for communicationthrough the sensor.Jumper MUST be in place between pins E2 and E3 orinaccurate readings could result.To connect the space temperature sensor (Fig. 13):1. Connect 1 wire of the twisted pair to terminal T1 (T55)and connect the other wire to terminal T2 on terminalblock 1 (TB1) located on the cover of the space tempera-ture sensor using a 20 AWG twisted pair conductor cablerated for the application.2. Connect the other ends of the wires to terminals 1 and 2on TB3 located in the unit main control box.NOTE: This sensor should be installed for all applica-tions. For VAV (variable air volume) applications, it isused to control heating and cooling during unoccupiedperiods. For DAV (digital air volume) applications, it isused to maintain control of the space during linkage fail-ures with the TSM (terminal system manager).NOTE: Either the T55 or T56 sensor must be connect-ed for CV (constant volume) applications to functionproperly.SPACE TEMPERATURE SENSOR (T56) (CV Applica-tions Only) — The space temperature sensor(P/N CEC0121503-01) wires are to be connected to termi-nals in the unit main control box. The space temperaturesensor includes a terminal block (TB1), a jumper betweenpins E2 and E3, and an RJ11 female connector. The RJ11connector is used to tap into the CCN at the sensor. See RJ11Plug Wiring section on page 24 to connect the RJ11 con-nector to the CCN.Jumper MUST be in place between pins E2 and E3 orinaccurate readings could result.To connect the space temperature sensor (Fig. 13):1. Connect one wire of the 3-conductor cable to terminalTH, one wire to terminal COM, and the other wire to ter-minal SW on terminal block 1 (TB1) located on the coverof the space temperature sensor using a 20 AWG twisted3-conductor cable rated for the application.2. Connect the other ends of the wires to terminals 1, 2, and3 on TB3 located in the unit main control box. The wirefrom terminal SW MUST be connected to terminal 3.NOTE: Either the T55 or the T56 sensor must be con-nected for CV applications to function properly.SPACE TEMPERATURE AVERAGING — Applications thatrequire averaging using multiple space temperature sensorscan be satisfied using either 4 or 9 sensors as shown inFig. 14.NOTE: Only Carrier sensors may be used for standard T55space averaging. Sensors must be used in multiples of 1, 4,and 9 only, with total sensors wiring not to exceed 1000 ft.However, space temperature reset can be accomplished withonly one sensor.NOTE: Do not use T56 sensors for space temperatureaveraging because the 5 degree offset function will not workin a multiple sensor application.HEAT INTERLOCK RELAY (VAV Units Only — Not Nec-essary For Digital Air Volume Applications) — Variable airvolume (VAV) units using optimal start (morning warm-up)and/or occupied heating require that room terminals be con-trolled to the fully open position when the unit goes intoheating mode. The HIR (Heat Interlock Relay) function isprovided for this control on DSIO no. 2, channel 60. Whenthe unit goes into heating mode, the HIR is energized to pro-vide switch closure or opening (depending on how the field-supplied power source is set up) to open the room terminals.The field connections for the HIR are: Normally Closed, ter-minals 8 and 10 on TB3; and Normally Open, terminals 8and 9 on TB3. See Fig. 15.OPTION AND ACCESSORY CONTROL WIRING — The48/50MP units may be used in applications with additionalcontrol features, options, or accessories. Refer to the Con-trols and Troubleshooting manual for more information con-cerning installation and configuration of options and acces-sories. Figures 15 to 29 contain wiring information on thefollowing features:• heat interlock relay (Fig. 15)• differential enthalpy sensor (Fig. 16)• remote start (Fig. 17)• accessory humidity control (Fig. 18)• fire/smoke control (Fig. 19)• indoor air quality (Fig. 20)• outdoor airflow control (Fig. 21)• timed discrete output (Fig. 22)• humidifier (Fig. 23)• hydronic heating (Fig. 24)• freezestat (Fig. 25)• remote supply air temperature/space temperature offset(Fig. 26)• transducer/thermistor (Fig. 27)• CCN Building Supervisor (Fig. 28)• variable frequency drive (VFD) (Fig. 29)17