Honeywell ST9141A1002 User Manual page 3

Fig. 2—ST9141A1002 internal schematic.
L1-1
K1
L1-2
BURNER
LIMIT
PRIMARY
LIMIT
N.C.
N.O.
COM.
PRESSURE
SWITCH
NOTE: DOTTED LINES REPRESENT PRINTED CIRCUIT BOARD WIRING.
FUSE
EAC (S)
K2 HEAT
K2 COOL
HUM (S)
K3A
CN1
1
X-OT
6
R-OT
8
PS1
3
7
PS2
L1
(H)
TO 120 VAC
POWER SUPPLY
INTERLOCK
ELECTRONIC AIR CLEANER
M2
MED-LOW
MED-HIGH
M1
HIGH
HUMIDIFIER
COMBUSTION
DI
AIR BLOWER
120 VAC
X
24 VAC
ST9141A
ELECTRONIC
FAN TIMER
K3B
FT
5
24V
3
L2
(N)
EAC (N)
LOW
CIRCULATING
FAN
HUM (N)
N3
N4
TRANSFORMER
C
G
Y
W
R
24V
C
4
2
SV9500 HOT SURFACE PILOT
IGNITION SYSTEM CONTROL
TSTAT FT GND
N1
N2
C
THERMOSTAT
COOLING
CONTACTOR
M5608
69-0780