Carrier 48/50PM C16-28, 48/50PG C03-14 manual Main Base Board MBB

Main Base Board (MBB)	The MBB also receives the Current Sensor inputs for compressors
See Fig. 40 and Table 23. The MBB is the center of the	and other discrete or digital inputs. The MBB reads space
	temperature (SPT) from either a T-55, T-56 or T-58 device and
ComfortLinkt control system. It contains the major portion of the
	space temperature offset (SPTO) from a T-56 device. See
operating software and controls the operation of the unit. The
	Field-Installed Accessories section. The MBB controls 9 relays.
MBB continuously monitors input/output channel information
	NOTE: The Main Base Board (MBB) has a 3-position instance
received from its inputs and from the Economizer Control Board
	jumper that is factory set to ‘1.’ Do not change this setting.
(ECB). The MBB receives inputs from thermistors and transducers.

RED LED - STATUS	GREEN LED -	YELLOW LED -
	LEN (LOCAL EQUIPMENT NETWORK)	CCN (CARRIER COMFORT NETWORK)
		INSTANCE JUMPER (SET TO 1)

CEPL130346-01

J1

J4

J6

J2

J3 LEN

CCN

J5

J7

STATUS

J8

J10

J9

C07026

48/50PG and PM

Fig. 40 − Main Base Board (MBB)

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