Blocked Inlet - A.O. Smith VB/VW 1500, 2000 Instruction Manual

CIRCUIT BOARD JUMPERS
MCB-II – JP1 (not used), JP2 (used – 2.7A igniter),
JP3 & JP4 (used – removed for hipot test).
PDB – JP1 (used – run selection, JP2 & JP3 (used –
removed for hipot test).
MCB-II DETAIL A
DIP SWITCH (SW1) FUNCTIONS
* 'ON' IS P OS IT ION T OWAR DS B OAR D'S E DG E .
1 – Boiler type ('ON' V B , 'OF F ' V W).
2 – Ignition trials ('ON' 3, 'off' 1).
3 – Mus t be 'OF F ', IRI gas valve not an option.
4 – Control probe ('ON' tank, 'OF F ' inlet).
5 – Power accessory ('ON' if us ed).
6 – Low water cutoff ('ON' if us ed).
7 – Mus t be 'ON', low gas switch always used.
8 – Spare (n/a).
9 – Spare (n/a).
10 – Spare (n/a).
ON/OFF MAIN POWER SWITCH
BK
Part of J-BOX
BK
INPUT
120VAC
W
POWER
G
(OUTSIDE CABINET) (OUTSIDE CABINET)
BUILDING BUILDING
J3 J3
0-10VDC 0-10VDC
MANAGEMENT MANAGEMENT
1 1
INPUT INPUT
2 2
INTERFACE (BMI) INTERFACE (BMI)
SIGNAL SIGNAL
DS1 GREEN LED (ON WHEN DS1 GREEN LED (ON WHEN
BOILER FOUND) BOILER FOUND)
DS2 BMI MICRO GREEN LED DS2 BMI MICRO GREEN LED
(2 HERTZ FLASH NORMAL) (2 HERTZ FLASH NORMAL)
REMOTE PROBE
Y
Y
EXT ENABLE/DISABLE EXT ENABLE/DISABLE
COM COM
NO NO
FLOW SWITCH
(OUTSIDE CABINET)
COM
BK/W
NO
R/G
MCB-II DETAIL B
DIP SWITCH (SW2) FUNCTIONS
* 'ON' IS P OS IT ION AWAY F R OM B OAR D'S E DG E .
1 – Spare (not used).
2 – High gas switch ('ON' if us ed).
3 – Spare (not used).
BK
BK
COM
BK
NO
W
ON/OFF
POWER RELAY
THRU CABINET
CAT-5 CABLE CAT-5 CABLE
J8 J8
J9 J9
1 1
2 2
3 3
Part of J-BOX
VB/VW 1500/2000 W
POWER DISTRIBUTION
PUMP FUSE
F2-20A
TB1
BK
A
1
BK
2
B
BK
3
C BK
4
D W
5
W
6
E G
7
BK
8
W
9
G
10
DS1 YELLOW LED
(OFF NORMAL)
DS2 GREEN LED
(ON NORMAL)
DS3 RED LED
(OFF NORMAL)
F F
BK/W ( ( 24VAC HOT) ) BK/W (24VAC HOT)
W/BK ( ( 24VAC RTN) ) W/BK (24VAC RTN)
G ( ( GROUND) ) G (GROUND)
OUTLET PROBE
with MR HIGH LIMIT
COM
NC
Y (+5VDC)
Y
BK/W
Y/V
HIGH GAS SWITCH HIGH GAS SWITCH
COM COM
NC NC
BK/W
R/G
LOW GAS SWITCH
COM
NO
32
BOARD (PDB)
J1
1
2
3
4
5
XFORMER
FUSE 6
F3-3A
J2
1
2
G (GROUND)
3
BLOWER
6
FUSE
7
F7-15A
J3
1
2
MCB-II FUSE
F6-10A
3
4
5
6
15
INLET PROBE
R (+24VDC)
R
BK (+5VDC)
BK
BLOWER PROVER
COM
BK/W
NO
Y/V
BK/W BK/W
R/G R/G

BLOCKED INLET

COM
NC
BK/W
R/G
BLOCKED FLUE
COM
NC
TRAN
12
BK
W
W/B
BK/W
W/B
BK/W
BK/W (24VAC HOT)
W/BK (24VAC RTN)
J3
1
2
3
J1
BK
1
W
2
G
3
J8
BL (+5VDC)
2
BL
3
J7
1
2
4
5
J9
3
4
J11
1
2
J17
1
2
3
4
5
6
BK/W
R/G
J5
1
2
3
4
BK/W
5
R/G
6