Carrier 48HC 04-28 - Main Base Board (MBB); MBB Overview and Connection Points

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Main Base Board (MBB)

See Fig. 32 and Table 29. The MBB is the center of the Com-

fortLink 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. 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 de-

vice. See Field-Installed Accessories section. The MBB con-

trols 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.

Fig. 32 — Main Base Board (MBB)

CEPL130346-01

STATUS

LEN

J10

CCN

RED LED - STATUS GREEN LED -

LEN (LOCAL EQUIPMENT NETWORK)

YELLOW LED -

CCN (CARRIER COMFORT NETWORK)

INSTANCE JUMPER (SET TO 1)

C07026

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