Lochinvar 000 - 2 - Manual (Page 49)

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 3 6
8
7 13
1
2
4
5
9
10
11
12 3 6
8
7
24 VAC
G
BL Y
BK
SPL
IC
E
8
SPL
IC
E
9
SPL
IC
E
6
LOW VOLTAGE
XFMR.
NEL
SPL
IC
E
5
SP
L
IC
E
4
HOT SURFACE IGNITER
BURNER
GROUND
MV PV MV
/P
V
1
2 SPLICE
BK
W
G
GY
GY
T
O
G
1
2
9
10
11
12
14
15 3
8
7 13 R
R/O
AIR PRESSURE
SWITCH
VALVE #1
F
E
Y
Y
MAIN UNIT - GAS VALVES - BLOWER PRESSURE SWITCH
MV PV MV
/P
V
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
CO
M
HI-LOW FIRE
FULL FIRE
WIRING CONNECTIONS DIAGRAM
1
5
7 8
6
3
4
3
5
7 8
4
1
6
BR
O
"R1"
1
2
LW
C
O
PR
O
B
E
1
2
W
BK
BK
120VAC
POWER
TO LOUVER OR
DAMPER
BR/W
PR
TEST
O
BR
BR
T
W
G
P
O
G
LOUVER /DAMPER
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 3 6
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
R O
A
OPERATOR
2
1
3
4
2
1
OPTIONAL I/O RESET
OA SENSOR
24
V
A
C
CO
NT
R
O
L
J 3
5
4
6
1
2
3
O.C.
J1
J2
3 2 1 J4
P GND
5
9
BL
BL
Y
Y
T BR/W
G
BR/W
BR/W
P
P R PR
1
5
9 7 8
6
3
4
3
5
7 9 8
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
LOUVER /DAMPER
120 VAC RELAY
ALARM BELL SILENCE
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