Main Base Board (Mbb) - Carrier 48LC 04 Controls, Start-Up, Operation And Troubleshooting

Single package rooftop units with comfortlink controls version 1.x and puron (r-410a) refrigerant

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Main Base Board (MBB)

See Fig. 16 and Table 16. The MBB is the center of the

ComfortLink control system. It contains the major portion of the

operating software and controls the operation of the unit. The

MBB continuously monitors input/output channel information

received from its inputs and from the Economizer Control Board

(ECB). The MBB receives inputs from thermistors and transducers.

RED LED - STATUS

CEPL130346-01

GREEN LED -

LEN (LOCAL EQUIPMENT NETWORK)

STATUS

LEN

CCN

Fig. 16 - - Main Base Board (MBB)

The MBB also receives the Current Sensor inputs for compressors

and other discrete or digital inputs. The MBB reads space

temperature (SPT) from either a T-55, T-56 or T-58 device and

space temperature offset (SPTO) from a T-56 device. See

Field-Installed Accessories section. The MBB controls 11 relays.

NOTE: The Main Base Board (MBB) has a 3-position instance

jumper that is factory set to '1.' Do not change this setting.

YELLOW LED -

CCN (CARRIER COMFORT NETWORK)

INSTANCE JUMPER (SET TO 1)

J10

C07026

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