Main Base Board (Mbb) - Carrier AQUASNAP 30RAP010-150 Controls, Start-Up, Operation, Service, And Troubleshooting

ALMR — Alarm Relay
AUX — Auxiliary
BR — Boiler Relay
C — Contactor, Compressor
CB — Circuit Breaker
CCB — Compressor Circuit Breaker
CH — Crankcase Heater
CHC — Cooler/Pump Heater Contactor
COMP — Compressor
CSB — Current Sensor Board
CWFS — Chilled Water Flow Switch
CWP — Chilled Water Pump
CXB — Compressor Expansion Board
DGS — Digital Scroll Compressor
DPT — Discharge Pressure Transducer
DTT — Discharge Temperature Thermistor
DUS — Digital Unloader Solenoid
EMM — Energy Management
EWT — Entering Water Temperature
EXV — Electronic Expansion Valve
FB — Fuse Block
FC — Fan Contactor
Main Base Board (MBB) —
the heart of the ComfortLink control system. It contains the
major portion of operating software and controls the operation
of the machine. The MBB continuously monitors input/output
channel information received from its inputs and from all other
modules. The MBB receives inputs from the discharge and
suction pressure transducers and thermistors. See Table 4. The
MBB also receives the feedback inputs from each compressor
RED LED - STATUS
J1
J2
J3
J4
J5
J6
J7
LEGEND FOR FIG. 3-12B
FCB — Fan Circuit Breaker
FIOP — Factory Installed Option
FR — Fan Relay
FU — Fuse
GND — Ground
HPS — High-Pressure Switch
HR — Heat Relay
LON — Local Operating Network
LVT — Low Voltage Terminal Block
LWT — Leaving Water Temperature
MBB — Main Base Board
MLV — Minimum Load Valve
MM — Motormaster
MP — Motor Protector
MS — Manual Starter
NEC — National Electrical Code
OAT — Outdoor-Air Thermistor
OFM — Outdoor Fan Motor
RGT — Return Gas Thermistor
SCCR — Short Circuit Current Rating
SPT — Suction Pressure Transducer
See Fig. 13. The MBB is
GREEN LED -
LEN (LOCAL EQUIPMENT NETWORK)
CEPL130346-01
STATUS
LEN
CCN
Fig. 13 — Main Base Board
SW
TB
TNKR
TRAN
UPC
VFD
current sensor board and other status switches. See Tables 5A
and 5B. The MBB also controls several outputs. Relay outputs
controlled by the MBB are shown in Tables 6A and 6B. Infor-
mation is transmitted between modules via a 3-wire communi-
cation bus or LEN (Local Equipment Network). The CCN
(Carrier Comfort Network) bus is also supported. Connections
to both LEN and CCN buses are made at the LVT (low voltage
terminal). See Fig. 13 and 14.
YELLOW LED -
CCN (CARRIER COMFORT NETWORK)
INSTANCE JUMPER
K11
K8 K7
K4
K3
J8
23
— Switch
— Terminal Block
— Storage Tank Heater Relay
— Transformer
— Unitary Protocol Converter
— Variable Frequency Drive
Terminal Block
Terminal (Unmarked)
Terminal (Marked)
Splice
Factory Wiring
Field Wiring
Accessory or Option Wiring
To indicate common potential
only; not to represent wiring.
K10 K9
K5
K6
J10
K1
K2
J9