LAARS NeoTherm NTV (Sizes 150–850 MBTU/h) - Install and Operating Manual - Manual (Page 53)

Page 49 N eo T herm Boilers and Water heaters
Figure 45 - Wiring Diagram, All Sizes - with Optional Full-Color Touchscreen H2355400B
BO
ILE
R
PU
M
P
GN
D
BL
K
W
H
G
N
CO
M 2
24Vac
24V co m
1
2
3
4
5
6
7
8
TO
TB4
-1
TO
TB3
-1
CO
M 1
BL
/G
N
Y/
G
N
PRESSUR
E
SWITCH
BR
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R/
W
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BR
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MB
1
MB
2
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THE
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SE
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PT
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SWIT
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ON
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IF
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C
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IS
NOT
INSTA
LL
ED
IN
TH
IS
LOC
A
TION. T
HE
TERMI
NA
L
JU
MPER
SH
OU
LD
B
E
IN
P
LA
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1
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R
BL
GY/WH
DKB/Y
TO
TB4
J6
-8
J6
-7
J6
-3
SE
E
TA
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2
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PT
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SWIT
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USE
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ON
SOME
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IF
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IN
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IS
LOC
A
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HE
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J8
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J8
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PUM
P
SY
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DH
W
FACTORY INSTALLED OPTION FOR 500 -850
CSD-1 ONLY
TABL
E
2.
GAS
VAL
V
E
W
IRE
COL
O
RS
TA
BL
E
1.
C
OLOR
ABBREV
IA
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N
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CO
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BLK/
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R
Y BL
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BLK/
Y
TAN
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TN
/B
L
TN
/B
LK
W
H
TN
/B
RN O
R
BR
N
BR
N
PUM
P
BYP
A
SS
RE
LA
Y
7
8
5 3 1
2 4 6
R1 R2
MS-
1
MS-
2
GY/W
H
SYSTEM SENSOR
AQUASTAT
OPTION
BLK/OR
DHW TEMP SENSOR
ALARM
WH/OR
WH/GY
OR/BLK
BL/Y
BL
TO
J 6-
8
TO
J 6-
7
ALARM
TB
6
FI
ELD
CONN
EC
TI
ON
S
WH & GR
Y
BLK/O
R
O
R/BL
K
J10-
8
J10-
7
7
3 2
SE
E
TA
BL
E
2
G
N D
GA
S
V
A
LV
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4 1 2 3
PRESSUR
E
SWITCH
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PU
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OR
PUR
SP
A
RK
IG
N
IT
O
R
J1
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J1
-2
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Y
2
1
2
1
6 1
1
6
1
6
6
1
1 2
2 1
TO GA
S
V
A
LV
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P1
WH
W
H
DR
Y
CON
TAC
TS
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LY
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EE
I/
O
MAN
UA
L
SE
C
T
5.
3
FIE
LD
O
PT
IO
N
S
OUTDOOR TEMP SENSOR
L NEUTRA
L
PUM
P
L NEUTRA
L
G
Y
C
RI
M
P
NU
T
G
R
W
H
BL
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TO
TB8
P
1
BL
K
G
Y
DK
B
G
Y
TO
TB4-P
1
TO
J4-1
0
Y
TO
TB6
P
1
TO
TB6
P
2
WH
/G
Y
WH
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R
TO
J
6-
2
WH/R/GN
GY/R
GR/VT
R
GR/BL
BL
WH/GY
TN
/B
LK
W
H
TN
TN
/Y
PU
R/
BL
K
PU
R
R/Y BR
N
BR
N/
W
H
WH
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TO
T
B2
PI
N
2
TO
XF
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RME
R
W
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TO
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PI
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2
TO XF
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BL
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W
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ADD'
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LIMI
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GR
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FIELD
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PT
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LO
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WA
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C
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GY/R
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BL
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W
H
V
T
GY
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Y
R
W
H
BL
K
Y
D
KB
Y
Y
TN
/R
TN
/B
L
O
R
TN
/B
RN
GY
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W
H/R/G
N
C
L
C
L C
L
C
L
C
L
WH
GR
/R
WH
/G
N
R/BLK
PK
DKB/Y
FS-
1
R
R/Y
BR/WH
BR
TN/Y
TN
R
Y
WH
/R
WH
/R WH
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L
WH
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L
DK
B
D KB
FS-
2
DK
B
DKB/
Y
DK
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WH
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PU
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PU
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R
C
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(Hon
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C
UST
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POW
ER
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PU
T
GR
WH
BLK
TB
1
110
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"H
O
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TB
2
110
V
N
EU
TR
A
L
TB
3
24
V
"H
O
T"
TB
4
24
V
COMMO
N
SW
1
J4
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J4-1
0
J4-1
2
G
N D
J4
-7
TB
5
BO
IL
ER
CONN
EC
TI
ON
S
J4
-5
J4
-4
J4
-3
J4
-2
J5
-1
J5
-2
SAFET
Y
CH
A
IN
J8-1
2
J8-1
1
J8-1
0
J8
-9
J8
-8
J8
-7
J8
-6
J8
-2
J8
-1
J2- 1
J2- 2
J2- 3
J2- 4
J9
-6
J9
-5
J9
-4
J9
-2
J9
-1
TB
7
FIE
LD
CONN
EC
TI
ON
S
OUTDOOR TEMP SENSOR
ANALOG INPUT -
ANALOG INPUT +
T-T OR INTERLOCK
OUTLE
T
TE
M
P
SENSO
R
(P2)
INLE
T
TE
M
P
SENSO
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(P1)
STA
C
K
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(P3)
G
N D
2
1
3
TB
8
FI
EL
D
CONN
EC
TI
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J6
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J6
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1 5
1 3
P4
P5
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V
SP
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RK
GN
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TRANSFORMER
110VAC INPUT
24VAC OUTPUT
BLO
W
ER
FLA
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E
RO
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C
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W
IT
C
H
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A
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PR
ESS
UR
E
SW
IT
C
H
500-850 CSD-1 ONLY
1
2
3
4
1
2
3
4
2
G
Y
DIS
PLA
Y
TO
UC
H-
SCREE
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LT
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+
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(O
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O
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BO
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ER
PU
M
P
INT
ERR
UPT
JU
M
PE
RS
BL
=
BLU
E
WH
=
WH
ITE
Y
=
YELLOW
H2355400B
DKB
=
DA
RK
BLU
E
CL
- CL
EA
R
BR
N
=
B
RO
W
N
R
=
RE
D
1.
TN
=
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VT
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PU
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=
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RPLE
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IGH
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ED
FR
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(IN
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RTI
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WIR
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80-
28
5
3
99-
50
0
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0-8
50
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RB
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1
KB
LB
-
2
LB
-
BK
D
3
NR
G
A
N
N
G
4
(Kit
#
KM50D7130)