Carrier 48TC*D08 Connecting Discrete Inputs, Power Exhaust output, RTU-MP /Outdoor CO2 Sensor

48TC

To connect the sensor to the control, identify the positive (4 to 20 mA) and ground (SIG COM) terminals on the OAQ sensor. See Fig. 51. Connect the 4 to 20 mA terminal to RTU-MP J4-5. Connect the SIG COM terminal to RTU-MP J4-6. (See Fig. 66.)

OAQ Sensor/RH Sensor

SEN J4-5

COM J4-6

24 VAC

C08463

Fig. 66 - RTU-MP / Outdoor CO2 Sensor

(33ZCSENCO2) Connections

On 48TC units equipped with factory-installed Smoke Detector(s), the smoke detector controller implements the unit shutdown through its NC contact set connected to the unit’s LCTB input. The FSD function is initiated via the smoke detector’s Alarm NO contact set. The RTU-MP controler communicates the smoke detector’s tripped status to the BAS building control. See Fig. 25 for unit smoke detector wiring.

The Fire Shutdown Switch configuration, MENU→Config→Inputs→input 5, identifies the normally open status of this input when there is no fire alarm.

Alarm state is reset when the smoke detector alarm condition is cleared and reset at the smoke detector in the unit.

Connecting Discrete Inputs

Filter Status

The filter status accessory is a field-installed accessory. This accessory detects plugged filters. When installing this accessory, the unit must be configured for filter status by setting MENU→Config→Inputs→input 3, 5, 8, or 9 to Filter Status and normally open (N/O) or normally closed (N/C). Input 8 or 9 is recommended for easy of installation. Refer to Fig. 60 and 61 for wire terminations at J5.

Fan Status

The fan status accessory is a field-installed accessory. This accessory detects when the indoor fan is blowing air. When installing this accessory, the unit must be

configured for fan status by setting MENU→Config→Inputs→input 3, 5, 8, or 9 to Fan Status and normally open (N/O) or normally closed (N/C). Input 8 or 9 is recommended for easy of installation. Refer to Fig. 60 and 61 for wire terminations at J5.

Remote Occupancy

The remote occupancy accessory is a field-installed accessory. This accessory overrides the unoccupied mode and puts the unit in occupied mode. When installing this accessory, the unit must be configured for remote occupancy by setting MENU→Config→Inputs→input 3, 5, 8, or 9 to Remote Occupancy and normally open (N/O) or normally closed (N/C).

Also set MENU→Schedules→occupancy source to DI on/off. Input 8 or 9 is recommended for easy of installation. Refer to Fig. 60 and Table 21 for wire terminations at J5.

Power Exhaust (output)

Connect the accessory Power Exhaust contactor coil(s) per Fig. 67.

Power Exhaust

PEC TAN J11-3

LCTB

THERMOSTAT

GRA C

C08464

Fig. 67 - RTU-MP Power Exhaust Connections

Space Relative Humidity Sensor - The RH sensor is not used with 48TC models at this time.

Communication Wiring - Protocols

General

Protocols are the communication languages spoken by control devices. The main purpose of a protocol is to communicate information in the most efficient method possible. Different protocols exist to provide different kinds of information for different applications. In the BAS application, many different protocols are used, depending on manufacturer. Protocols do not change the function of a controller; just make the front end user different.

The RTU-MP can be set to communicate on four different protocols: BACnet, Modbus, N2, and LonWorks. Switch 3 (SW3) on the board is used to set protocol and baud rate. Switches 1 and 2 (SW1 and SW2) are used to set the board’s network address. See Fig 68 for the switch setting per protocol. The 3rd party connection to the RTU-MP is through plug J19. Refer to the RTU-MP 3rd Party Integration Guide for more detailed information on protocols, 3rd party wiring, and networking.

NOTE: Power must be cycled after changing the SW1-3 switch settings.

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