Terminal blocks, Jumpers, Figure 2 – LAARS NeoTherm NTH (Sizes 285–850 MBTU/h) - Installation Manual User Manual
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pg 2 of 4
H2368400
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Litho in U.S.A. © Laars Heating Systems 1405 Document 7031
• Connect the White wire to the
boiler pump connections on
boiler Terminal Block (TB5)
across from the other white wire.
• Connect the Black wire to the
other boiler pump connection on
boiler Terminal Block (TB5).
POWER CONNECTIONS:
• Connect the Blue wire anywhere on the
24V+ boiler Terminal Block (TB3).
• Connect the Yellow wire anywhere on the
24V Neutral boiler Terminal Block (TB4).
• Locate the Blue Gas Valve power wire coming from the Sola control.
Trace the wire through where it passes into the back panel, and locate
the first wire. Disconnect the male/female spade connection. Insert the
VARI-PRIME connections as shown.
FIELD CONNECTIONS:
• Remove VARI-PRIME Cover.
• Remove the VARI-PRIME control box from the packaging and
familiarize yourself with each connection point.
Figure 2
See Figure 2
Terminal
Blocks
FIRMWARE SETTINGS
P = 20
I = 10
D = 0
ANTI RESET WINDUP = 600
CONTROL ERROR = 70
10K
R14 C12 R13 C11
-2
4V
INLET
SENSOR
1
2
3
4
1
2
3
4
1
2
3
2
3
4
4
1
1
2
3
2
4
6
8
1
3
5
7
1
3
5
7
+2
4V
6
8
SENSOR
2
4
10K OUTLET
JP5
TB1
7&8 = F
1&2 = SPARE JUMPER
TB2
TB5
TB4
TB6
PCB
DIGITIZED
P/N E2345200
LED1
JP1
7&8 = (Delta T) 30 DEG F / 16 DEG C
TB3
JP4
JP2
1&2 = (Delta T) 15 DEG F / 8 DEG C
3&4 = (Delta T) 20 DEG F / 10 DEG C
5&6 = (Delta T) 25 DEG F / 13 DEG C
JP3
N/C
COM
4-20MA(-)
4-20MA(+)
0-10VDC(+)
0-10VDC(-)
N/O
Jumpers