LAARS Heating Systems
Page 36
Figure 19. Field Connections (on TB1)
1
CA0099
VARI-PRIME PRINTED CIRCUIT BOARD KIT
9
2
KM004400
AUTO-RESET HIGH LIMIT CONTROL
8
1
E2339800
TOUCH SCREEN
ALARM SILENCE SWITCH
MANUAL RESET HIGH LIMIT
ALARM BELL (optional)
LOW WATER CUT-OFF
BAS GATEWAY (optional)
7
1
E2346100
6
1
KM004300
5
1
A0014300
4
Terminal block for field connections
A0014300
3
1
E0086800
2
1
30N7050
1
QTY
PART NO.
DESCRIPTION
ITEM NO.
PARTS LIST
5
2
4
6
8
1
9
7
3
CONN
A
15 BOILER PUMP H
16 BOILER PUMP N
17 SYSTEM PUMP H
18 SYSTEM PUMP N
19 DHW PUMP H
20 DHW PUMP N
21 OUTDOOR/SYS
22 OUTDOOR/SYS
23 ANALOG (-)
24 ANALOG (+)
25 TT
26 TT
27 ALARM
28 ALARM
29 PUMP OUTPUT (+)
30 PUMP OUTPUT (-)
31 DHW SENSOR
32 DHW SENSOR
33 COM2 A
34 COM2 B
35 COM2 HC
36 MB2- A
37 MB2- B
38 MB2- C
39 REMOTE RESET
40 REMOTE /TOOLS
41
42 TOD FEED
43 4-20MA (+)
43 0-10VDC/4-20MA
44 0-10VDC
CONN
B
CONN
C
Outdoor Sensor/
System Sensor
Signal to Modulate
Call for Heat
Lead Lag
Connections
DHW Sensor
VFD Drive
8.E Field Connections for
Single unit installations
Power for Field Connections must be
made at Terminal Board 1 at the front of
the unit (15 thru 45 of TB1). See Figure
19 and Figure 20
For single unit installations, the
connections for System Sensor,
Outdoor Sensor, Call for Heat, and
DHW are as marked on TB1.
1. Central Heat Only. Jumper on 25/26.
System Sensor on 21/22.
Outdoor Sensor on Lag (Slave) boiler’s 21/22 (OUTDOOR/SYS)
2. DHW Only
Jumper on 25/26.
Tank Sensor on 21/22.
NO Outdoor Sensor is used.
3. Central Heat AND
DHW
Jumper on 25/26.
System Sensor on 21/22.
DHW Tank Sensor on 31/32
Outdoor Sensor on Lag (Slave) boiler’s 21/22 (OUTDOOR/SYS)
8.F Field Connections for
Lead / Lag installations
For Lead / Lag installations, there are 3
possible installation scenarios.
