Pg 4 of 4, Neotherm nt 1000, Neotherm nt 1700 – LAARS NeoTherm NTH (Sizes 285–850 MBTU/h) - Installation Manual User Manual
Page 4: Customer service and product support, Headquarters, Neot herm 1700 mbt u /h unit s, Neot herm 1000 mbt u /h unit s, Di a g ra m, Vfd pri n te d ci rcui t boa rd wi ri ng

pg 4 of 4
Customer Service and Product Support:
800.900.9276 • Fax 800.559.1583
Headquarters:
20
Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax 603.335.3355
1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax 905.366.0130
www.Laars.com
Litho in U.S.A. © Laars Heating Systems 1405 Document 7031
E23450
24V
8
7
W
BK
12
0V
A
C
VARI
NEUT
RAL
24V
+
Y
B
L/
W
B
VARI
5
BK
8
B
L/W
HOT
NEUT
RAL
SU
PP
LY
CUSTOMER SUPPLI
ED
PUMP RELAY
120 VAC
1/4"
FE
M
BK
VARI
W
PRI
M
E
NEOT
HERM 1700 MBT
U
/H UNIT
S
8
BOILER
7
B
A
TB5
NEOT
HERM 1000 MBT
U
/H UNIT
S
6
5
4
3
2
1
BK
W
B
L/W
MALE
FIE
LD
W
IRE
#14
2NDARY
SEC
ONDARY GAS
VA
LVE
#11
TB4-2
TO PCB
BK
120V
B
L/W
CONFIGURATION
M
SPLIC
E
3
8
7
5
1
CR1
BOILER
W
24V
TB4
N
EU
+2
4VA
C
BLR
TB3
B
L/
W
H
#
1
+120
BLR
TB5-3
NE
U
BLR
TB5-4
BLR
BL/R
M
TO
M
F
PCB TB1
-2
DETAIL D
CUS
TOME
R
M
DE
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C
M
PRI
MARY
F
GA
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TY
PI
C
A
L
SI
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LE
B
U
R
N
ER
B
O
IL
ER
#12
BL/R
#10
BL
#11
BL
BR
RE
D 1/
4"
B
L/W
TO PCB
BR
2N
DA
RY
F
TB4-4
DET
AI
L F
GAS VA
LVE
GAS
VALVE
2N
DA
RY
1
BL
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FE
M
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PR
IMARY
YE
L #
8
5
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N
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1/4"
BLUE
FIELD WIRING: VF
D ANALOG IN
PU
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N
D
T
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ER
M
IS
TO
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IN
G
0-
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(-
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0-
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(+
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4
3
21
4
3
21
SEE
N
O
TE
4
ON CA0099
TB2
(+2
4V)
#13
#12
BL/R
#10
4
32
R
ELA
Y TO C
LOSE C
ON
TA
C
TS FOR
220/240VA
C
TB
5-
3&
4 TO EN
ER
GIZE
A COIL ON CUS
TOME
R
SU
PP
LIE
D BY
CUS
TOME
R
4.
CONFIGURATION
TY
PI
CAL
TW
O
BURNE
R
BOILE
R
DE
TAIL
B
CONNE
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TYPIC
A
L TH
ER
M
ISTOR
DETAIL C
0039
PINS
39-
00-
TH
ER
M
ISTOR
F
#11
BL
FEM
A
LE
NEOTHERM NT 1000
TB4-4
TO PCB
GAS
VALVE
PR
IMARY
ITEM
E2346400
SEE N
OTE 4
Bl/R #13
#13
TB4
BL/R
#4
Y
#5
Y #6
Y #5
Y #6
Y #4
NN
NN
TB2
4
321
TB6
Y
2
(+
)
1
3
2
1
3
2
1
(-)
4-
20mA
4-
20ma(
+)
BL
PRI
MARY
GAS
VAL
VE
PCB E
NCLOS
URE
HON
EYWELL J5-
2 (PR
I)
HON
EYWELL J5-
2 (SEC
)
(OP
TIONAL)
0-
10V
DC/
INP
U
T
ANALOG
BO
IL
ER
PUM
P
(CUS
TOME
R)
(CUS
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R)
N/O
N/C
COM
VFD
1/4"
FE
M
P/N LAARS-E2345000
D
IJ
IT
IZ
ED
P
O
W
ER
TB1
TB3
TB5
24VA
C
10K TH
ERM
ISTOR
10K TH
ERM
ISTOR
INLET TEMP SENSOR
4-
20ma(
-)
LED1
4
BL #11
OUTLET TEMP SENSOR
#7
DK
BL/
YEL #
9
PCB
BLUE
TE
RMINAL BLOCK
FLOATING
D
K
B
LU
/Y
EL
YEL
FOR 1
20
VAC V
FD P
UMP
S THE
CUS
TOME
R
{
WIRE
S HE
RE
2
X
TO
P
R
O
TE
C
T
OR DETAIL E
SEE D
ETA
IL D
BL/R
M
F
NEOTHERM NT 1700
DE
TAIL
A
2NDARY
GAS VA
LVE
MO
LE
X
1/4"
NP
T
TB4-4
TO PCB
BL
GAS VA
LVE
NEOTHERM NT 285-850
RE
D 1/
4"
MALE
CONFIGURATION
TY
PI
CAL
TW
O
BURNE
R
BOILE
R
TB4-2
TO PCB
TB4-2
GAS
VALVE
WIRE -
10
V
D
C
OR 4
-2
0 MA AS WIRE D
IAG
RAM IND
IC
A
TES. IF
0
-1
0 V
D
C
IS U
SED
TH
EN
5.
JU
M
PE
R R
EM
A
IN
S O
N
J
P4
. I
F 4
-2
0 M
A
IS
U
SE
D
T
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EN
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UM
PE
R M
US
T B
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O
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ED
T
O
J
P5
.
2/
C #18 AWG S
HI
EL
DE
D CABLE
#12
BL
NEUT
RAL
B
BOILER
#10
CRIMP
PRI
M
E
24V
+
AS
P
ER
INS
TRUCTIONS
NOTE
D IN MANUAL
7
WILL WIRE DIRECTLY TO BOILER TB5-3&4
WILL USE LAARS 120VAC FROM BOILER
PO
W
ERE
D BO
IL
ER P
UM
P
TYPICAL LAARS 220/240VAC
DETAIL E
FOR 2
20
/2
40
VAC V
FD P
UMP
S THE
CUS
TOME
R
RE
LAY
FIE
LD WIRE
D
1 2 3 4
6
5
PU
MP
TB5
A
F
PO
W
ER
ED
B
O
IL
ER
P
U
M
P
TY
PI
CAL LAARS
1
20
VAC
PU
MP
BK
W
G
BOILER
1 2
3 4
C
O
N
N
EC
TO
R
6
FIELD WIRED
TB5
A
#13
BL/R
PRI
M
E
B
L/
W
Y
NOTES:
0-10VDC O
UT
PUT
S
HO
W
N.
FO
R 4-20m
a O
UT
PUT
CO
NNE
CT
1. O
TH
ER
2
C
O
N
N
EC
TIO
N
S ON
T
B3
TB6 IS ALARM CONTACT RELAY F
O
R PCB
2.
FA
C
TORY
D
EL
TA T SETTING
= 2
0
F
3.
US
E HE
AT S
HRINK
TUBE
(P
ROV
IDE
D)
BLUE
FI
ELD
TO PCB
BL
PRIMA
RY
GAS VA
LVE
REV
D
C
B
A
B
C
D
1
2
3
4
5
6
7
8
7
6
5
4
32
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BY
L
A
A
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TIN
G
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YS
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M
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8
DWG NO.
SH
REV
.
E23450
IN
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N
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SIZE
:
1
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2
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:
TO
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A
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DEC
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A
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D
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EN
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N
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IN
CH
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D
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A
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D
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IN A
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IN
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.
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C
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: NO
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