Hydronic Heating Boilers and Domestic Water Heaters Installation and Service Manual

49
WIRING DIAGRAMS - MAIN UNIT CONNECTIONS
MODELS 495,000 - 745,000 BTU/HR (CONTINUED)
LBL20007 REV A
1
2
3
4
1
2
1
2
W
BK
120VAC
POWER
TO LOUVER OR
DAMPER
BK
BK
OPTION BOX "A"
LOUVER/DAMPER
120 VAC RELAY
4
6
2
BK
BR
C
W
10
11
12
14
15
13
1
2
4
5
9
10
11
12
14
15
36
8
713
1
2
4
5
9
10
11
12
36
8
7
24 VAC
G
BL
Y
BK
SPLICE 8 SPLICE 9 SPLICE 6
LOW VOLTAGE
XFMR.
NEL
SPLICE 5
SPLICE
4
HOT SURFACE IGNITER
BURNER
GROUND
MV PV MV/PV
1
2
SPLICE
BK
W
G
GY
GY
T
O
G
1
2
9
10
11
12
14
153
8
713
R
R/O
AIR PRESSURE
SWITCH
VALVE #1
F
E
Y
Y
MAIN UNIT - GAS VALVES - BLOWER PRESSURE SWITCH
MV PV MV/PV
W
W
BK
120VA
C
PUMP
120VAC
SUPPLY
BLOWER
GROUND
LOW AIR
INDICATOR
Y
BK
BR
W
GR
VALVE #2
PR
Y
W
BK
CHASSIS GROUND
SPLICE
SPLICE
COM
HI-LOW FIRE
FULL FIRE
WIRING CONNECTIONS DIAGRAM
1
5
78
6
3
4
3
5
78
4
1
6
BR
O
"R1"
1
2
LWCO
PROBE
1
2
W
BK
BK
120VAC
POWER
TO LOUVER OR
DAMPER
BR/W
PR
TEST
O
BR
BR
T
W
G
P
O
G
LOU VER /D AM PER
120 VAC RELAY
ALARM BELL
SILENCE
CONTACTS
FOR
LWCO ALARM
RESET
R
4
6
2
LWCO
ALARM
CONTACTS
24 VAC
RELAY
4
6
2
BR
1
2
3
4
6
G
OPTION BOX "B"
PR
SPLICE
BR
T
~~~~
~~~~
R
P
O
BL
BR/W
BR
G
C
BK
BK
W
CN9
TO
SHUTDOWN
O.A. MAX. RATIO
O.A.
DISABLE
SHUTDOWN
ON
SENSOR
ENABLE
CN1
1
2
4
5
9
10
11
12
36
8
7
OPERATOR
INLET
PROBE
SYS/
TANK
SETPOINT
CN1
CN2
CN3
CN4
CN5
CN6
CN7
CN8
CN9
OFF
DIFFERENTIAL
HIGH-FIRE
OFFSET
R/O
O
BL
Y
O
O BK
BK
PR
PR
RO
A
OPERATOR
2
1
3
4
2
1
OPTIONAL I/O RESET
OA SENSOR
24 VAC
CONTROL
J3
5
4
6
1
2
3
O.C .
J1
J2
3
21
J4
P GND
5
9
BL
BL
Y
Y
T
BR/W
G
BR/W
BR/W
P
PR
PR
1
5
978
6
3
4
3
5
798
4
1
6
BR
BR
O
"R1"
1
2
"C"
LWCO
PROBE
LWCO INDICATOR
1
2
W
BK
BK
120VAC
POWER
TO LOUVER OR
DAMPER
BR/W
SPLICE
TEST
BK
W
BK
P
PR
O
BR
BR
T
W
O
G
O/W
T
T
T
T
LOU VER /D AM PER
120 VAC RELAY
ALARM BELLSILENCE
O BL
CONTACTS
FOR
ALARM
NO
C
NO
C C
NC
R
R
Y
P
PR
Y
4
6
2
NORMALLY
CLOSED
BR
~~~~ ~~~~
`
P
O