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Main Base Board
(MBB)
See
Fig.
16 and
Table
19.
The
MBB
is the
center
of the
ComfortLink
control
system.
It contains
the maior
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
RED LED - STATUS
GREEN LED -
_
LEN (LOCAL EQUIPMENT NETWORK)
CEPL130346-01
L_
STATUS
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
9 relays.
IMPORTANT:
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
J7
I
I
I
©
Fig. 16 - Main
Base Board
(MBB)
J9
C 07026
47
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