Bryant ASPAS1BBA007, Diagnostic Repair Manual, Page: 79 / 144

Page 79
SECTION 4.2
OPERATIONAL ANALYSIS
DC CONTROL
PART 4
• Should "Utility" voltage drop below approximately
60 percent of the nominal source voltage, a 15-
second timer on the circuit board will turn on.
• In Figure 2, the 15-second timer is still timing and
engine cranking has not yet begun.
• The Auto-Off-Manual switch is shown in its AUTO
position. Battery voltage is available to the circuit
board, via Wire 13, 15 amp fuse (F1), Wire 15, the
Auto-Off-Manual switch (SW1), Wire 15A, and Pin
10 of the circuit board connector.
F1
SM
C1-1
15
0 0
18
C1-5
56
18
17
15
17
15A
SCR
0
0
0
15
16
239
15
14
0
194
23
13
18
D
IM2
IM1
SP2
SP1
23
16
0
13
SC
0
SW1
15
15A
239
194
FS
0
14
C2-1
WINDING
(STATOR)
POWER
22
44
11
CB1
33
56VA
1VA
13
225
225A
224A
224
TX
17
N1
N2
11
22
C2-5
N2
N1
C2-6
11
194
23
194
23
N1
N2
CUSTOMER
SUPPLIED
BATTERY
12V
BLACK
RED
SC
240V
120V
120V
CUSTOMER
CONNECTIONS
COIL
12Vdc
UTILITY
INPUT
240VAC
RELAY
TRANSFER
TR
12VDC ACCESSORY SOCKET
+
-
14
0 0
15
17
22
N
11 23
194
22
D
GFCI
OUTLET
EXTERNAL
G G
G
L N
L
11
G G
N N
CB3
N
0 0
15
15
15
13
15
15B
15B
F2
0 0
239
Figure 2. Circuit Condition - Initial Dropout of
Utility Source Voltage