Field Wiring Connections Ð All ®eld wiring must comply with National Electric Code (NEC) and all local re- quirements. The recommended wiring is as follows:

Dampers, actuators,

Ð

4-conductor 20 AWG cable

and valves

Ð

(2 twisted pairs, unshielded)

Sensors

2-conductor 20 AWG cable

 

 

(one twisted pair, unshielded)

Refer to Table 8 for recommended brands and part numbers.

Table 8 Ð Recommended Sensor and

Device Wiring

MANUFACTURER

PART NUMBER

Regular*

Plenum*

 

Alpha

1895

Ð

American

A21501

A48301

Belden

8205

88442

Columbia

D6451

Ð

Manhattan

M13402

M64430

Quabik

6130

Ð

*Within a building.

NOTE: Wiring is 20 gage, 2-conductor twisted cable.

REMOTE LOCAL INTERFACE DEVICE (HSIO) Ð When ordered as part of a 39L or 39NX unit, the HSIO is factory- installed and fully wired.

To reinstall the HSIO in a remote location away from the control box, refer to the factory wiring connections in Fig. 9-12 and proceed as follows:

1.Use a 20 AWG 2-conductor twisted wire pair (Belden No. 8205 or equivalent) to supply power to the HSIO mod- ule. Use a 20 AWG 3-conductor cable shielded with drain wire (Belden No. 8772 or equivalent) for communication with the HSIO. Cable length must not exceed 1000 ft.

2.Pull the 2 cables (power and signal) through the electri- cal conduit to the NEMA standard box or HSIO. Leave approximately 4 ft of wire in the PIC control box for terminations.

3.Route the cables from the PIC control box to the HSIO bracket. Secure the HSIO cables to the existing cables using either tie wraps or by twisting the HSIO cables around the existing cables. Strip back the jacket 6 in. on each cable after cutting off the excess. Connect the power cable at the PIC control box to the existing 3-pin connector hang- ing at the HSIO bracket. The wires should be terminated in the screw-type locking clamps on Terminals 1 and 2.

4.Connect the signal cable at the PIC control box to the existing 4-pin communications connector hanging at the HSIO bracket. The wires should be terminated in the lock- ing clamps on Terminals 1, 2, and 3. The shield should be terminated at the HSIO bracket (ground). Be sure to note the color coding used on the cable for later reference when terminating the other end of the cable.

5.At the NEMA standard box or HSIO, connect the power conductors to Pin 1 and 2 of the 3-pin plug. Using the color coding from the above step, connect the signal cable to Pin 1, Pin 2, and Pin 3 of the 4-pin communications connector. Remove the shield and drain wire from this end of the cable.

6.After the HSIO is installed inside the remote cover, con- nect the 4-pin and 3-pin plugs to the HSIO.

RETURN-AIR TEMPERATURE SENSOR, OUTDOOR- AIR TEMPERATURE SENSOR, ENTHALPY SWITCH, AND MIXED-AIR TEMPERATURE SENSOR Ð Wires are to be connected to the proper terminals on the processor mod- ule. See Fig. 44 for details.

Select a 20 AWG twisted pair, no shield cable. Connect as per table below:

 

PROCESSOR

SENSOR

MODULE

 

PIN NO.

Return-air temperature sensor (RAT)

20 and 21

Outside-air temperature sensor (OAT)

5 and 6

Enthalpy switch (ENT)

34 and TB2-3

Mixed-air temperature sensor (MAT)

8 and 9

Space temperature sensor (SPT)

17 and 18

NOTE: The MAT is factory wired on all units with a factory-installed mixing box, ®lter mixing box, or air blender.

SPACE TEMPERATURE SENSOR (SPT) Ð The space tem- perature sensor cover includes terminal block TB1, a jumper between Pin E2 and Pin E3, and an RJ11 female connector. The RJ11 female connector connects the service tool with the Carrier Comfort Network.

Jumper MUST be in place between Pin E2 and Pin E3 or inaccurate readings could result. Ensure that the jumper is in place before installing the sensor.

Using a 20 AWG twisted pair conductor cable rated for the application, connect one wire of the twisted pair to Terminal T1 and connect the other wire to Terminal T2 on TB1. See Fig. 45.

The other ends of the wires are connected to the processor (PSIO master) module. As polarity is not a consideration, connect one wire to Terminal 17 and one wire to Terminal 18 of the processor module.

RJ11 Plug Wiring Ð Refer to the Carrier Comfort Network Interface, page 64, for communication bus wiring and cable selection. The cable selected must be identical to the CCN communication bus wire used for the entire network.

Cut the CCN wire and strip the ends of the RED, WHITE, and BLACK conductors. Insert and secure the RED (1) wire to Pin J2 of the SPT terminal strip TB1. Insert and secure the WHITE (ground) wire to Pin J3 of the SPT terminal strip TB1. Insert and secure the BLACK (−) wire to Pin J5 of SPT terminal strip TB1.

The other end of the communication bus cable must be connected to the remainder of the CCN communication bus at the COMM1 plug on the processor (PSIO master) mod- ule. Refer to Carrier Comfort Network Interface section, page 64, for more details.

DAMPER ACTUATORS Ð The PIC processor can activate

a®eld-installed modulating exhaust/relief damper. This is achieved by wiring the factory-supplied damper actuator in series with the factory-supplied and ®eld-installed mixing box damper actuator.

The PIC processor can also activate a ®eld-installed damper actuator mounted in a ®eld-supplied mixing box. These ac- tuators are available from the factory when ordered as an option with the unit.

See Table 9 for recommended actuators.

NOTE: The actuator selected must be capable of receiving a 4 to 20 mA signal and must have a total impedance of less than 250 ohms. Wire should be 20 gage minimum, twisted- pair type and rated for the application.

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Carrier 39L specifications Recommended Sensor Device Wiring, Manufacturer Part Number, Processor, Sensor Module PIN no

39L specifications

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