Carrier WEATHERMASTER 48/50Z030-105 Operation And Service Manual page 114

ACCSY — Accessory
ACC'Y — Accessory
AF — Airfoil
AN — Analog
APS — Air Pressure Switch
BM — Blower Motor
BR — Blower Relay
C — Compressor Contactor
CB — Compressor Circuit Breaker
CBT — Circuit Breaker, Transformer
CCB — Control Circuit Breaker
CCN — Carrier Comfort Network®
CCT — Cooling Coil Thermistor
CEM — Controls Expansion Module
CH — Crankcase Heater
CM — Combustion Motor
COMP — Compressor
CR — Control Relay
CSB — Current Sensor Board
CV — Constant Volume
DI — Digital Input
DPT — Discharge Pressure Transducer
ECB — Economizer Control Board
ECON — Economizer
EQUIP — Equipment
FU — Fuse
GND — Ground
GVR — Gas Valve Relay
HC — Heater Contactor
HIR — Heat Interlock Relay
HPS — High-Pressure Switch
HS — Hall Effect Sensor
HV — High Voltage
I — Ignitor
RED LED - STATUS
J1 J2
J3
J4
J5
J6
J7
ROOFTOP CONTROL BOARD (RCB) — The RCB has
additional inputs and outputs required for the control of the
unit. All units have an RCB board. See Fig. 27. The board has
9 inputs and 8 outputs. Details can be found in Table 88. The
RCB board is located in the main control box.
ECONOMIZER CONTROL BOARD (ECB) — The ECB
is used on size 075-105 units with high-capacity power exhaust
or return/exhaust fan. See Fig. 27. The ECB board sends a 4 to
20 mA signal to the VFD to control the exhaust fan speed. The
board also has inputs to sense the return fan cfm and supply fan
LEGEND FOR FIG. 15-25
IAQ
IDM
IFC
IFCB
IFM
IGC
IGV
IP
LEI
LEN
LS
MBB
MGV
MMC
MMR
MOD PE —
NEC
OA
OAQ
OAT
OD
OFC
OFM
OPT
PE
PEC
PECB
PEM
PL
PTC
RA
RAT
RCB
GREEN LED - LEN (LOCAL EQUIPMENT NETWORK)
CEPL130346-01 HK 50AA029 CE BO 430346
STATUS
LEN
Fig. 26 — Main Base Board (MBB)
— Indoor Air Quality
— Induced Draft Motor
— Indoor Fan Contactor
— Indoor Fan Circuit Breaker
— Indoor Fan Motor
— Integrated Gas Controller
— Inlet Guide Vane
— Internal Protector
— Local Equipment Interface
— Local Equipment Network
— Limit Switch
— Main Base Board
— Main Gas Valve
— Motormaster® Contactor
— Motormaster Relay
Modulating Power Exhaust
— National Electrical Code
— Outdoor Air
— Outdoor Air Quality
— Outdoor-Air Thermostat
— Outdoor
— Outdoor Fan Contactor
— Outdoor Fan Motor
— Option
— Power Exhaust
— Power Exhaust Contactor
— Power Exhaust Circuit Breaker
— Power Exhaust Motor
— Plug Assembly
— Positive Temperature Coefficient
Power Reference
— Return Air
— Return Air Thermistor
— Rooftop Control Board
YELLOW LED -
CCN (CARRIER COMFORT NETWORK)
J8
cfm. This board is located in the main control box. Input and
output assignments are summarized in Table 89.
STAGED GAS HEAT BOARD (SCB) — When optional
staged gas heat is used, the SCB board is installed and controls
additional stages of gas heat. See Fig. 28. The SCB also pro-
vides additional sensors for monitoring of the supply-air and
limit switch temperatures. This board is located in the main
unit control box. The inputs and outputs are summarized in
Table 90.
114
RF — Return Fan
RS — Rollout Switch
SAT — Supply Air Thermistor
SCB — Staged Gas Control Board
SEN — Sensor
SPT — Suction Pressure Transducer
STDU — Standard Tier Display Unit
TB — Terminal Block
TRAN — Transformer
U — Unloader
VAV — Variable Air Volume
VFD — Variable Frequency Drive
Terminal Block
Terminal (Unmarked)
Terminal (Marked)
Splice
Factory Wiring
Field Wiring
To indicate common potential
only, not to represent wiring.
To indicate factory-installed
option or accessory
INSTANCE JUMPER (SET TO 1)
J9
J10