Carrier WeatherExpert 48N2, Controls, Start-Up, Operation, Service, And Troubleshooting

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LEGEND FOR Fig. 18-31
ACCSY — Accessory LON — Local Operating Network
ACC’Y — Accessory LPT — Liquid Pressure Transducer
ACC FSS — Accessory Fan Status Switch LS — Limit Switch
AN — Analog LT — Liquid Temperature
APS — Air Pressure Switch LVT — Low Volume Terminal
BP — Building Pressure MBB — Main Base Board
BR — Blower Relay MGV — Main Gas Valve
C — Compressor Contactor MLV — Minimum Load Valve
CB — Compressor Circuit Breaker MMF — Motormaster Fuse
CCB — Control Circuit Breaker MMR — Motormaster Relay
CCH — Crankcase Heater MMV — Motormaster VFD
CCHR — Crankcase Heater Relay MP — Communications
CCN — Carrier Comfort Network® NEC — National Electrical Code
CCT — Cooling Coil Thermistor OA — Outdoor Air
CEM — Controls Expansion Module OAQ — Outdoor Air Quality
CMR — Compressor Modulation Relay OAT — Outdoor-Air Thermistor
CO — Convenience Outlet OD — Outdoor
COMP — Compressor OFC — Outdoor Fan Contactor
CR — Control Relay OFM — Outdoor Fan Motor
CSB — Current Sensor Board OL — Overload
CXB — Compressor Expansion Board PE — Power Exhaust
DGS — Discharge Gas Sensor PECB — Power Exhaust Circuit Breaker
DI — Digital Input PEM — Power Exhaust Motor
DP — Duct Pressure PL — Plug Assembly
DPT — Discharge Pressure Transducer PP — Communications
DTT — Discharge Temperature
Thermistor
PPSS — Plenum Pressure Safety Switch
DUS — Digital Unloader Solenoid PS — Pressure Switch
ECC — Evaporative Condenser Control PTC — Positive Temperature
Coefficient Power Reference
ECON — Economizer RACFM — Return Air CFM
EQUIP — Equipment RAT — Return Air Thermistor
EXV — Electronic Expansion Valve RF — Return Fan
FS — Filter Switch RFCB — Return Fan Circuit Breaker
FS/FP — Filter Switch/Filter Pressure RFM — Return Fan Motor
FTS — Filter Switch RGT — Return Gas Thermistor
FU — Fuse RHPS — Relative Humidity Power
Supply
GND — Ground RS — Rollout Switch
GVR — Gas Valve Relay RXB — Rooftop Control Board
HC — Heater Contactor SACFM — Supply Air CFM
HIR — Heat Induction Relay SAT — Supply Air Thermistor
HGBP — Hot Gas Bypass SC30 — Signal Conditioner Control
Board
HMV — Humidi-MiZer Valve SCB — Staged Gas Control Board
HPS — High-Pressure Switch SCCR — Short Circuit Current Rating
HS — Hall Effect Sensor SCR — Silicon Controlled Rectifier
HV — High Voltage SEN — Sensor
HVS — Humidi-MiZer
®
Valve Solenoid SPT — Suction Pressure Transducer
I — Igniter ST — Suction Temperature
IAQ — Indoor Air Quality TB — Terminal Block
IDM — Induced Draft Motor TR1 — Timer Relay Control Board
IFCB — Indoor Fan Circuit Breaker TRAN — Transformer
IFM — Indoor Fan Motor UPC — Unitary Protocol Converter
IGC — Integrated Gas Controller VAV — Variable Air Volume
LEN — Local Equipment Network 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