114
LEGEND FOR FIG. 15-25
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
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.
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
IAQ — Indoor Air Quality
IDM — Induced Draft Motor
IFC — Indoor Fan Contactor
IFCB — Indoor Fan Circuit Breaker
IFM — Indoor Fan Motor
IGC — Integrated Gas Controller
IGV — Inlet Guide Vane
IP — Internal Protector
LEI — Local Equipment Interface
LEN — Local Equipment Network
LS — Limit Switch
MBB — Main Base Board
MGV — Main Gas Valve
MMC — Motormaster® Contactor
MMR — Motormaster Relay
MOD PE — Modulating Power Exhaust
NEC —
National Electrical Code
OA — Outdoor Air
OAQ — Outdoor Air Quality
OAT — Outdoor-Air Thermostat
OD — Outdoor
OFC — Outdoor Fan Contactor
OFM — Outdoor Fan Motor
OPT — Option
PE — Power Exhaust
PEC — Power Exhaust Contactor
PECB — Power Exhaust Circuit Breaker
PEM — Power Exhaust Motor
PL — Plug Assembly
PTC — Positive Temperature Coefficient
Power Reference
RA — Return Air
RAT — Return Air Thermistor
RCB — Rooftop Control Board
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
CEPL130346-01 HK 50AA029 CE BO 430346
STATUS
LEN
J1
J2
J4
J3
J5
J6
J7
J8
J9
J10
RED LED - STATUS
GREEN LED - LEN (LOCAL EQUIPMENT NETWORK)
YELLOW LED -
CCN (CARRIER COMFORT NETWORK)
INSTANCE JUMPER (SET TO 1)
Fig. 26 — Main Base Board (MBB)
