Legend - System Wiring - American Standard 50A65-475 Manual

Legend – System Wiring
24 V.
Factory Wiring
LINE V.
24 V.
Factory Wiring
LINE V.
Earth Ground
Chassis Ground
Junction
Wire Nut or Connection
Coil
Capacitor
Transformer
Connector
Press. Actuated Switch
Temp. Actuated Switch
Door Switch
Fusible Link
Terminal
Terminal Board
Color of Wire
BK / BL = Black Wire With Blue Marker
Color of Marker
BK Black OR Orange YL Yellow
BL Blue RD Red GR Green
BR Brown WH White PR Purple
GV Gas Valve
CF Fan Capacitor
Gnd Ground
L Line
LVTB Low Voltage Terminal Board
MTR Motor
N Neutral
TCO High Temperature Limit Switch
TNS Transformer
NO Normally Open
NC Normally Closed
COM Common
GM Gas Valve Main
HLO High Limit Output
GE Gas Valve E.Q.S.O.
ROI Roll-Out Input
PO Pressure Switch No.
GC Gas Valve Common
FSO Flame Sensor Output
GR Gas Valve Redundant
PC Press. Switch Nc
PCOM Press. Switch Com
FSI Flame Sensor Input
TR 24V AC Trans. Com Side
TH 24V AC Trans. Hot Side
R Redundant
M Main
EQSO Electrical Quick Shut Off
Thermally Protected Internally
Terminal
Number Type
W
W
G captive
R screw
Y
B/C
MV
MVL
MVH
MVCOM
TR 12-pin
TH connector
PS and
PS2 harness
FP
PS1
HLI
HLO
GND
50A50 Only
IND 4-pin
IGN connector
IND N and
IGN N harness
50A51 Only
IND LO 5-pin
IND HI connector
IND N and
IGN harness
IGN N
COOL
PARK
HEAT
HEAT LO
HEAT HI
LINE
XFMR spade
EAC
HUM
CIR N
LINE N
XFMR
XFMR N
48
System Component Connection
low voltage thermostat W terminal first stage heat
low voltage thermostat W terminal second stage heat
low voltage thermostat G terminal indoor fan
low voltage thermostat R terminal 24 VAC Hot
low voltage thermostat Y terminal compressor contactor
24 VAC COMMON side of compressor contactor coil
gas valve (both gas valve solenoids are connected in parallel)
gas valve first stage heat
gas valve second stage heat
gas valve COMMON
24V AC transformer (low voltage COMMON SIDE)
24V AC transformer (low voltage HOT SIDE)
pressure switch INPUT
pressure switch 2 INPUT
flame sensor probe
pressure switch INPUT
high limit INPUT
high limit OUTPUT
MUST BE RELIABLY GROUNDED TO CHASSIS
inducer motor HOT side
ignitor HOT side
inducer motor NEUTRAL side
ignitor NEUTRAL side
inducer motor HOT side low speed
inducer motor HOT side high speed
inducer motor NEUTRAL side
ignitor HOT side
ignitor NEUTRAL side
indoor blower COOL SPEED terminal
unused indoor blower terminal
indoor blower HEAT SPEED terminal
indoor blower low HEAT SPEED terminal
indoor blower high HEAT SPEED terminal
input voltage (120V AC) HOT SIDE
24V AC transformer line voltage HOT SIDE
air cleaner HOT SIDE
humidifier HOT side
indoor blower NEUTRAL terminal
input voltage (120V AC) NEUTRAL SIDE
24V AC transformer line voltage
24V AC transformer line voltage NEUTRAL SIDE