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Page 56
7.I
Ladder Diagrams (continued)
208/240VAC (1PH/60Hz)
L1
L2
R2
1
CB
CB
CB
TB1-120L
CB
2
TB1-24V
TB1-120L
CONTROLLER
POWER
TB1-120N
TB1-43
TT-1
TB1-44
TB1-45
HEAT
TT-2
DEMANDS
TB1-46
TB1-47
DHW
TB1-48
3
LWCO
MANUAL RESET
HIGH LIMIT
TB1-44
TB1-43
HIGH GAS
PRESSURE
SAFETY CHAIN
(24VDC)
(24VDC)
LOW GAS
PRESSURE
AUTO RESET
HIGH LIMIT
4
CONDENSATE
Figure 29. Ladder Diagram, Models 1000, 1500, 2000. 208V / 240V, Single Phase
1
120VAC
OFF
ON
120VAC
24VAC
BOILER INTEGRATED CONTROLLER (BIC)
X10-1
X10-3
X2-1
X2-8
X2-1
X2-8
X2-1
X2-8
X4-1
X4-11
X4-2
X4-12
X4-3
X4-13
X4-4
X4-14
X4-5
X4-15
X4-6
X4-16
X4-7
X4-17
X4-8
X4-18
X4-9
X4-19
LAARS Heating Systems
1 2 4 5
CONVENIENCE
OUTLET
A
TB1-120N
R2
TB1-24N
X14-8
TB1-24
120VAC
FROM BIC
X14-1
TB1-23
X14-4
TB1-29
X14-11
TB1-30
X14-3
TB1-27
X14-10
TB1-28
Dual Element
X1-1
1
10k
3
X1-14
20k
X1-2
Dual Element
X1-1
1
10k
3
X1-15
20k
X1-3
X1-13
2
1
X1-1
CFT 1.0, 1.5, 2.0 208/240V 1PH
DWG# E23967 REV -
LABEL# H24054
DOCUMENT# H24055
2
PWM SIGNAL
BLOWER
120VAC TRANSFORMER
POWER SWITCH
TERMINAL STRIP 120VAC
VFD CONTACTOR
24VAC TRANSFORMER
TERMINAL STRIP 24VAC
BOILER PUMP
(NOT INCLUDED)
P
SYSTEM PUMP
DRY CONTACT
DHW PUMP
DRY CONTACT
2
Outlet
4
Sensor
FACTORY
INSTALLED
2
Flue
4
Sensor
Inlet
Sensor
LOGIC DIAGRAM
1
PRESSURE
2
TRANSMITTER - 1
3
1
PRESSURE
2
TRANSMITTER - 2
3
TB1-120L
TB1-120N
TB1-GND
12VDC
POWER SUPPLY
TB1-120L
L
V+
TB1-120N
N
V-
TB1-GND
G
O2 SENSOR
X22-11
X22-12
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