American Standard 50A65-475 Manual page 9

Component Identification
Single Stage 90% Upflow/Horizontal
HIGH TEMPERATURE
ELECTRICAL
JUNCTION BOX
PRESSURE
SWITCH
TRANSFORMER
CONDENSATE
TRAP
LIMIT SWITCH
COOL-H PARK PARK LINE-H
E17 E28 E27 E13
HEAT-H EAC-H XFMR-H HUM-H
LINE-N
E16 E18 E14 E20
E7
1 HUM-N
K3
E8
2
EAC-N
E9
U2
3
XMR-N
E10
4
Q9
K2
CIR-N
E11
K1
OFF ON
1
2
3
S1
E1
10 11 12
7 8 9
4 5 6
1 2 3
5 AMPS
DS1
DS1 E34
50A65474
Y W R G C
CNT02854
7
BURNER
SIGHT GLASS
FLAME ROLL-OUT
SWITCH
(MANUAL RESET)
GAS VALVE
INDUCED DRAFT
BLOWER
TCO (LIMIT)
DOOR SWITCH
4 SPEED MOTOR
IGNITION
CONTROL
MOTOR
CAPACITOR