LEGEND

ENT

Ð

Enthalpy Switch

MAT

Ð

Mixed-Air Temperature Sensor

OAT

Ð

Outside-Air Temperature Sensor

RAT

Ð

Return-Air Temperature Sensor

SPT

Ð

Space Temperature Sensor

 

 

Field Wiring

NOTE: Connections for 39NX with integral PIC shown. See wiring diagrams in Fig. 9 and 12 for terminal connections in 39L control box and all remote-mount control boxes.

Fig. 44 Ð Field Wiring of Sensors

IMPORTANT: Jumper may be connected from E1 to E3. Move jumper to connect E2 and E3 before installing sensor, otherwise incorrect space tem- perature values are generated.

Fig. 45 Ð Space Temperature Sensor Wiring

For factory-supplied actuators that are ®eld-installed, the 24 vac power source is included with the unit wired in the control box. For ®eld-supplied actuators, a 24 vac power source must be ®eld-supplied and installed for each actuator.

To prevent equipment damage: Power must NOT be con- nected to an earth ground; actuator case must NOT be connected to control input terminals.

Field-Supplied Exhaust Damper Ð Wire the 4 to 20 mA sig- nal of the factory-supplied exhaust damper actuator as fol- lows (Fig. 46):

1.Select a 20 AWG twisted pair conductor cable rated for the application. Identify the positive (1) and negative (−) signal contacts on the actuator.

2.Install cable from the actuator to the PIC control box.

3.Remove jumper no. 84 from between terminals TB2, 7 and 8. Connect positive (1) lead to terminal 8 of TB2. Connect negative (−) lead to terminal 7 of TB2.

Field-Supplied Modulating Mixing Box Ð Wire the 4 to 20 mA signal of the factory-supplied damper actuator as fol- lows (Fig. 47):

1.Select a 20 AWG twisted pair conductor cable rated for the application. Identify the positive (1) and negative (−) signal contacts on the actuator.

2.Install cable from the actuator to the PIC control box.

3a. For the outside-air damper (OAD) actuator, connect the positive (1) lead to pin 40 of the processor module. Con- nect the negative (−) lead to terminal 6 of terminal block 2 (TB2).

b.If the actuator is factory-supplied, connect the actua- tor's 24 vac power wires to TB2, terminals 19 and 20. If the actuator is ®eld-supplied, connect the power wires to a separate, isolated 24 vac power source.

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Carrier 39L specifications Field Wiring of Sensors

39L specifications

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