Installation / Operation Instruction Manual

Page 55
Figure 31. Ladder diagram, 120V, Single Phase.
TB1-46
220VAC
BLOCKED BLOCKED
PWM SIGNAL
X5-7
X5-6 X5-2 X5-1
4321
GND
X1-15
X1-13
X1-3
X1-2
X1-14
X1-1
X1-1
Inlet
Sensor
Flue
Sensor
20k
10k
Dual Element
20k
X1-1
10k
INSTALLED
FACTORY
Dual Element
Sensor
Outlet
1
2
12
34
43
21
120VAC (1PH/60Hz)
BMS
RS485
RS485
CASCADE
ALARM RELAY
DRY CONTACTS
DRY CONTACTS
RUN RELAY
0-10V(+)
Blower(-)
0-10V(+)
Pump(-)
ANALOG
OUTPUTS
INPUTS
ANALOG
HEAT
DEMANDS
INPUTS
SENSOR
DRY
CONTACTS
OUTPUTS
POWER
B
A
GND
GND
A
B
Common
N.C.
N.O.
N.O.
N.C.
Common
0-10V(+)
Blower(-)
0-10V (+)
BAS (-)
DHW
DHW
TT-2
TT-2
TT-1
TT-1
Outdoor
Outdoor
DHW
DHW
System
Return
System
Supply
Aux
Aux
Pump
System
DHW
Pump
Aux (L)
Aux (N)
Pump (L)
Boiler (N)
TB1-19
TB1-20
TB1-17
TB1-18
BLOWER
TB1-61
TB1-62
TB1-59
TB1-60
TB1-57
TB1-58
TB1-55
TB1-56
TB1-53
TB1-54
TB1-51
TB1-52
TB1-49
TB1-50
TB1-47
TB1-48
TB1-45
TB1-43
TB1-44
TB1-41
TB1-42
TB1-39
TB1-40
TB1-37
TB1-38
TB1-35
TB1-36
TB1-33
TB1-34
TB1-32
TB1-31
TB1-30
TB1-29
TB1-26
TB1-25
TB1-24
TB1-23
TB1-22
TB1-21
CONVENIENCE
OUTLET
ROD
FLAME
X15-4 X9-1
MAIN VALVE
X9-3
PILOT VALVE
X21-3X21-1
SPARK
IGNITOR
X12-2
GENERATOR
SPARK
X12-1
(NOT INCLUDED)
(24VDC)
SAFETY CHAIN
24VAC TRANSFORMER
X4-19
INTAKE FLUE
X4-9X4-18
CONDENSATE
X4-8X4-17
ADDITIONAL HIGH LIMIT
X4-7
X4-16
LOW GAS PRESSURE
X4-15 X4-6
HIGH GAS PRESSURE
MRHL
X4-14 X4-5
THERMAL CUTOUT
X4-4
X4-13X4-3X4-12
LWCO
X4-2X4-11
FLOW
X4-1
DHW PUMP
DRY CONTACT
X14-3TB1-21 X14-10 TB1-22
DRY CONTACT
SYSTEM PUMP
X14-11 TB1-24X14-4TB1-23
BOILER PUMP
P1
TB1-17X14-1X14-8 TB1-18
120VAC
X5-10 X5-5 BIC 24VAC
120L 120N TB 120VAC
TB 24VAC24N24V
CB
24VAC
BIC 120VACX10-3X10-1
VFD CONTACTOR
POWER SWITCH
POWER INDICATOR
R2
CB
CB
A
ONOFF
L1 N
R2
TB1-27
TB1-28
Alarm
Bell
, MGT
LOGIC DIAGRAM,
SIT CONTROLS,
120V 1
H2393600A
7.H Ladder Diagrams