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