Lochinvar 1,260,000, Installation And Service Manual, Page: 68 / 72

Hydronic Heating Boilers and
Domestic Water Heaters
68
LADDER DIAGRAM 990,000 - 2,070,000 BTU/HR MODELS
24 VAC
CONTROL
J3
5
4
6
1
2
3
O.C.
J1
J2
3 2 1
J4
P
O
NC
BR/
W
ALARM INPUTS
1, 2, 3 & 4
JOIN HERE
S2/FS
F2
F1
LINE
S1
O/W
PRESSURE
SWITCH #2
RESET
PURGE
Y
P
T/W
S2/
FS
-
+
F2
F1
NEU
LINE
S1
O
G
R
PRESSURE
SWITCH #1
RESET
PURGE
GY
GY
PUMP RELAY
BK
BK
STAGE #2
BLOWER #1
W
W
W
Y
~~~~
~~~~
STAGE #1
16 15
18 17
22 21
20 19
HEAT
DEM
#1
EL
EC
TR
O
NI
C
TEMP
ERAT
U
RE
C
ON
TRO
LL
ER
OPTIONAL
RUN TIME
RELAY
CONTACTS
LBL20012 REV A
24 VAC
12 24
23
120 VAC
1
14 13
+
-
HD-
Y
Y
W
CHASSIS
GROUND
-
INTERMITTENT
ALARM ENABLE
RELAY
Y
Y
2NO 2C
4NO 4C
1NO 1C
3NO 3C
BK
BK
R
R
BK/W
G
W
Y
OPTIONAL
CONTACTS
ANY FAILURE
IGNITER
TRIAL
GY
GY
BK
P
BL
O O
O/W
O/
W
R/O
BL
BR
BR
BK
G
NEU W
W
CIRCUIT BREAKER
BL
+
ALARM
CONTACTS
OPTIONAL ALARM
BELL 24V OUTPUT
SILENCE
BL
ALARM
G
BL
Y
C1
C2
NO1
NO2
PROVING RELAY
C1 NO1
A1 B1 A2 A3 B2 B3
CONTINUOUS INTERMITTENT
FLOW
SWITCH
O
STATUS
Y
CHASSIS
GROUND
CHASSIS
GROUND
SEN
SO
R
S
IGNITER
TRIAL
GY/
W
HI-LIMIT
AUX. HI-LIMIT
PR
ALARM
INPUT 4
BK
1
2
BK
L A R
T U E N E N I L
GROUND
BL
ALARM
INPUT 3
O/
BK
BR
BL
PR/
BK
BL
PR/BK
STAGE #1
STAGE #4
STAGE #3
BLOWER #2
Y
Y
Y
Y
W
W
W
Y
R
R/O
R/O
R/BK
R/W
BL
R
120 VAC 15AMPS
60Hz
O/BK
R/
BK
R/
W
BL
Y PR PR
Y
PR
BK/
W
BR/W BR/W
BR BR
W
PR PR
T
PR/BK
PR/BK
BR/W
BR/W
BR/W
PR /BK
PR /BK
BR/W
Y
Y
PROVING
SWITCH
MOTOR
CONTACTS
W
BK/W
BK/
W
W
BR
T
T
B
R
B
R
ON/OFF
POWER
SWITCH
PR
R/
O
LOUVER /
VENTER
ENABLE/
CONTACT
RELAY
FIELD SUPPLIED LOUVER /
POWER VENTER CONNECTIONS
TEST
SWITCH
T
RESET
PR
T
(1) WHERE POSSIBLE, ALL SWITCHES AND CIRCUITRY ARE SHOWN IN THEIR AT REST STATES
.
NOTES:
(2) ADDITION OF ENERGY MANAGEMENT SYSTEMS OR OPTIONAL LIMIT SWITCHES TO THE TERMINAL
(3) SCHEMATIC IS WIRING DIAGRAM, REFER TO ACTUAL COMPONENTS FOR EXACT TERMINAL LOCATIONS.
DOTTED LINE
INDICATES OPTIONAL
EQUIPMENT
ITEM INDICATES
CLOSED END SPLICE
JUNCTION POINT
(ELECTRICALLY SAME)
T=TAN
Y=YELLOW
BR=BROWN
G=GREEN
GY=GRAY
W = WHITE
BK = BLACK
PR=PURPLE
BL=BLUE
P=PINK
O=ORANGE
(4) WHEN REPLACING DAMAGED WIRING, USE EQUIVALENT TYPE AND GAUGE.
TD
P
P
PROBE
BL/
BK
Y
PUMP
STAGE #2
STAGE #4
STAGE #3
AE
PU
LE
PR
HIGH
LOW
BL/W
OPTIONAL LOUVER/VENTER
CONTROL RELAYS
R
R
= RELAYS LO CATED O N CO NTRO L
PANEL
= RELAYS LO CATED IN W IRING BO X
OPEN
CLOSED
COM
PROVING RELAY
C2 NO2
R/O
Y/G = YELLOW WITH GREEN STRIPE
R=RED
RELAY
BOARD
HD#1
HD#2
ALARM
INPUT 1
OPTIONAL
PR
A1
B1
A2 A3
B
2 B3
CONTINUOUSLY
MONITORED
INTERMITTENTLY
MONITORED
FIELD INSTALLED
SAFETY DEVICES
NOTE:
SHOWN WITH SHORTING
BARS REMOVED AND ATTACHED
DEVICES IN NON-ALARM STATE.
CONTINUOUS INTERMITTENT
COM COM
FAIL
OK OK
FAIL
HIGH/LOW GAS, AUX. HI-LIMIT
AUX. LIMITS , EXT. FLOW SWITCH
EXAMPLE DEVICES:
BK
10
9
8
1
3
4
5
6
7
2
2
9
4 7
5
6
4
2
3
4
2
3
STAGE #1
STAGE #3
STAGE #2
STAGE #4
PR
BR
1
2
6
5
4
3
OUTLET
BR
BR
PR
PR
PR
24VAC
PI
RESET
PS
FF
TH
24COM
MV
M/S
1
2
4
5
6
7
8
9
11
3
10
24VAC
PI
RESET
PS
FF
TH
24COM
MV
M/S
1
2
4
5
6
7
8
9
11
3
10
-
+
LOW
HIGH
-
+
STATUS
-
+
BL/W
8
9
7
6
4
5
4
1
3
6
5
T
6
P-SW#1
IGN#1-PS
IGN#2-PS
P-SW#2
-24VAC Y
Y
O/
BK
~~
~~
~~
~~
~~
~~
~ ~ ~
~ ~ ~
3
4 1
PROVING RELAY
BL
TE
R
M
IN
A
L
ST
R
IP
IGNITION
MODULE
#1
IGNITION
MODULE
#2
ALARM
INPUT 2
PR/BK
PR
P
BL/BK
GY/W
GY/W
GY/
W
SYSTEM/TANK
O.A.
SENSOR
FLAME
CURRENT
TEST PINS
FLAME
CURRENT
TEST PINS
RT1 RT2
BK
W
W
BK
GY GY
BR/W
2
BL/
BK
PUMP OPTIONAL
ON BOILERS
BL
WARNING:
THIS HEATER MAY BE
CONNECTED TO ONE OR MORE BRANCH
CIRCUITS. TO PREVENT ELECTRICAL SHOCK,
ENSURE ALL BRANCH CIRCUITS ARE DE-
ENERGIZED BEFORE ATTEMPTING TO SERVICE
THIS EQUIPMENT.
OPTIONAL
BOILER ONLY
INLET
R/BK
R
R/W
2
RESET
OVERRIDE
3
HEAT
DEM
#2
R/
O
FIELD
INSTALL AS
NECESSARY
C N.O.
REMOVE
JUMPER
STRIP REQUIRE THE REMOVAL OF SOME OF THE SHORTING BARS FROM THE TERMINAL STRIP.
NO TE :
SO ME STAG ES HAVE
MO RE THAN O NE G AS VALVES .
R
R
PR/BK
1
3
8
BL/BK
5
1
5
1
BL
Y
Y
OPTIONAL
PR
FFR
P
PR
AL
Y
P
Y
G
PR
PR
= LEDS LO CATED O N DISPLAY BO ARD
~~~~
~~~~
= O PTIO NA L DIN RAIL CO NNECTO RS
LO CATED IN ELECTRICAL W IRING BO X .
GND
C
C
NO
NO
PR
OPTIONAL HIGH-LOW GAS
PRESSURE SWITCHES
PR
LOW HIGH
O/BK
INTERMITTENT
ALARM ENABLE
RELAY
C
C
NO
NO
C
NO
C
NO
C
NO
C
NO
W
TO POWER
SOURCE
RESET
O
BL/BK
BL
Y
PR
PR
T