7.Verify proper wiring between the BAS and the con- troller.

8.Verify that the BAS is reading or writing to the proper Modbus register numbers on the controller. Download the latest points list for the controller to verify.

9.Verify that the BAS is sending his requests to the proper slave address of our controller.

NOTE: See RTU-MP 3rd Party Integration Guide (or alternatively Form 48-50H-T-1T, Appendix) for Modbus Protocol Conformance Statement.

N2

1.Verify that the BAS and controller are both set to speak the N2 protocol. The protocol of the controller is set via SW3 (switches 3, 4, 5, and 6). The protocol can also be verified by getting a Modstat of the con- troller through the BACview. Hit the “FN” key and the ’.’ key at the same time to pull up a Modstat. Scroll to the bottom of the page and there is a section entitled ”Network Communications.” The active pro- tocol and baud rate will be shown in this section.

2.Verify that the BAS and controller are set for 9600 baud. The baud rate of the controller is set via SW3 (switches 1 and 2). The baud rate can also be verified via the BACview by obtaining a Modstat (see above).

3.Verify that the BAS is configured to speak 2-wire EIA-485 to the controller. The BAS may have to con- figure jumper or DIP switches on their end.

4.Verify that the BAS and the controller have the same communication settings (8 data bits, No Parity, and 1 stop bit).

5.Verify that the controller has a unique N2 slave ad- dress on the N2 bus. The controller’s N2 slave ad- dress is set by its rotary address switches.

6.Verify proper wiring between the BAS and the con- troller.

7.Verify that the BAS is reading or writing to the proper network point addresses on the controller. Download the latest points list for the controller to verify.

8.Verify that the BAS is sending his requests to the proper slave address of our controller.

NOTE: See RTU-MP 3rd Party Integration Guide (or alternatively Form 48-50H-T-1T Appendix) for N2 Protocol Conformance Statement.

ECONOMIZER SYSTEMS

The 48TC units may be equipped with a factory-installed or accessory (field-installed) economizer system. Two types are available: with a logic control system (EconoMi$er IV) and without a control system (EconoMi$er2, for use with external control systems such as PremierLink). See Fig. 70 and Fig. 71 for component locations on each type. See Fig. 72 and Fig. 73 for economizer section wiring diagrams.

Both EconoMi$ers use direct-drive damper actuators.

 

ECONOMI$ER IV

 

CONTROLLER

WIRING

OUTSIDE AIR

TEMPERATURE SENSOR

HARNESS

LOW AMBIENT

 

 

SENSOR

ACTUATOR

48TC

 

 

C06021

Fig. 70 - EconoMi$er IV Component Locations

 

OUTDOOR

 

AIR HOOD

ECONOMI$ER2

HOOD

PLUG

SHIPPING

 

BRACKET

GEAR DRIVEN

BAROMETRICDAMPER

RELIEF

DAMPER

C06022

Fig. 71 - EconoMi$er2 Component Locations

55

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Carrier 48TCA04---A12 appendix Economizer Systems, EconoMi$er IV Component Locations
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48TCA04---A12 specifications

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To sum up, the Carrier 48TCA04---A12 rooftop air conditioning unit stands out due to its exceptional energy efficiency, durable construction, advanced technology, and quiet operation, making it a reliable choice for commercial and industrial cooling solutions. Its flexibility and smart technology integrations ensure that it meets a wide range of climate control requirements effectively.
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