Product data

80
Typical wiring schematic — 50TFQ008-012
LEGEND
AHA — Adjustable Heat Anticipator
C—Contactor, Compressor
CAP — Capacitor
CB — Circuit Breaker
CC — Cooling Capacitor
CH — Crankcase Heater
COMP — Compressor Motor
D—Diode
DB — Defrost Board
DFT — Defrost Thermostat
EC — Enthalpy Control
ECON — Economizer
EPS — Emergency Power Supply
(Nine-Volt Battery)
EQUIP — Equipment
ER — Economizer Relay
FPT — Freeze-Up Protection
Thermostat
FU — Fuse
GND — Ground
HC — Heater Contactor (Strip Heat)
HPS — High-Pressure Switch
HR — Heater Relay
IFC — Indoor-Fan Contactor
IFM — Indoor-Fan Motor
IFMOVL — Indoor-Fan Motor
Overload Switch
LPS — Low-Pressure Switch
LSM — Limit Switch (Manual Reset)
MCA — Minimum Circuit Amps
MTR — Motor
OAT — Outdoor-Air Thermostat
OFC — Outdoor-Fan Contactor
OFM — Outdoor-Fan Motor
P—Plug
PL — Plug Assembly
R—Relay
RVS — Reversing Valve Solenoid
SAT — Supply-Air Thermostat
SW1 — Switch Fully Open
SW2 — Switch Fully Closed
SW3 — Switch Min. Vent Position
SW4 — Switch Max. Vent Position
TB — Te r m i n al B l o ck
TC — Thermostat-Cooling
TH — Thermostat-Heating
TRAN — Transformer
Field Splice
Marked Wire
Terminal (Marked)
Terminal (Unmarked)
Te r m in a l B lo c k
Splice
Splice (Marked)
Factory Wiring
Field Control Wiring
Field Power Wiring
Accessory or
Optional Wiring
To indicate common
potential only. Not to
represent wiring.
50TFQ004-01250TFQ004-012