Install Instructions

LAARS Heating Systems
Page 30
Figure 22. Wiring Diagram.
BOILER PUMP
SYSTEM PUMP
RELAY
CIR C UIT
BR EA KER
CIR C UIT
BR EA KER
FLOW
SWITCH
AIR
PR ESSU R E
SWITCH
BLOC KED
VEN T SW
LO W
WA TER
CUT OFF
SPARK
IG N ITO R
H-X/DHW
SENSOR
OPER .
CONTR O L
SAFETY
LIMIT
FLO W
SENSO R
FLAME
SENSO R
HI LIM IT SW ITC H
WATER
PR ESSU R E
SWITCH
DHW PUMP
RELAY
INLET
PR O BE
FLUE
TE M P
FLUE
SA FETY
12
1
6
12
7
DISPLAY
HARNESS (E23579)
1
YO
4
1 2
43
1 2
3
RR
PWB
T2
FWB
G
GND
3 WAY VALVE CO MBI UNITS ONLY
SPARE
Y
R
G
W
COMBI O NLY
BLGY
O
O
O
O
O
V
OPTIONAL
O
V
SAFETY
MODBUS
A
V
FROM X1
O
O
G
W
G
INTERLOCK
FRO M X 4
FRO M X6
MAIN CONTROL
TR ANS FO RM E R
GA S V ALV E
W
BK
W
BK
DHW
Y R
Y
BL
R
DC O UT
DC IN
SENSOR
SENSOR
AQUASTAT
TANK
NEUT
NEUT
NEUT
LINE
LINE
LINE
INTERLK T
FIELD T
GRO UND
21
21
4
2
BL
1
4
8
5
SENSOR
OUTDOOR
L1 IN
NEUTRAL
GROUND
SYSTEM
R
W/V
V
V
BK
G
FROM X5
BR
TO /FRO M X3
GY
BL
GY
O
R
BK
Y
BL W
1
GY
W/R
R
BK
1
W
W/GY
G
BLO W ER
9
4
22
8411
9
712
6
4
2
11
16
18
6
1
7
1
5
1
3
16
BL BR
R G
8
10
5
GY
V
1
G
BK
G Y
GY
R
W
BL
Y
BK
R
O
Y
BR/G
V
O
R
BR
BK
GY
W
BL
Y
W
V
W/V
BK
W/R
G
R
GY
W/GY
R
V
G
W
O
O
R
Y/R
R
BL
Y
Y
X5
X1
X6
3X4X11X2X
X7
X8 X9
20 40
21
12 24
13
GY
Y
O
BR
R
G
V
BL
Y
BR
R
BL
GY
O
BK
W
G
V
BK/R
FROM XO
FROM X8
FROM FWB
FROM FWB
FROM PWB
PUMPS BY OTHERS
WHEN REQ'D
O
GY
BL
Y
GY
O
BR
R
BR
V
Y
G
W
BK
BK/R
R
G
V
BL
W
BK
BK/R
BK
G
G
BK
W
W
BK
G
G
BR /G
Y
1
FACE DOW N
3
XO
FEMALE
(TO XX)
POW ER SW ITC H
X8
FROM H-X/D HW SEN SO R
FROM FWB
O
O
O
O
BK
V
O
O
3
XX
MALE
(TO XO)
2
1
O O
FROM X11
FACE UP
O
W
G
2
1
X12
Y
BR
ALARM
CONTACTS
Y
BR
+ - - +
B
2 4
5
8
61
7
H2365100D
WIRE DIAGRAM