Ladder Diagrams - Bradford White OmniTech BONH1250 Installation And Operation Instructions Manual

7.H Ladder Diagrams
120VAC (1PH/60Hz)
GND L1 N
X14-8
TB1-21
TB1-19
X4-1
X4-4
X4-7
X12-3
Figure 22. Ladder Diagram 120V 1 Phase 1250 - 2000
OFF
BOILER/HEATER
120L 120L CONTROLLER
GAS VALVE
CB
LWCO
24V
BOILER/HEATER
CONTROLLER
TB1-35 TT-1 TB1-37
TB1-36 TT-1 TB1-38
P1
TB1-18
X14-4
X14-3
FLOW
X4-11 X4-2
GAS VALVE
RELAY INTERLOCK
X4-14 X4-5
ARHL
(OPTIONAL)
X4-17 X4-8
SPARK X9-3
X12-4
GENERATOR
SPARK
X15-4
IGNITOR
3
R1
ON
TT-2 TB1-39 DHW
TT-2 TB1-40 DHW
X14-1 TB1-17
TB1-22
X14-11
X14-10 TB1-20
LWCO
X4-12 X4-3
HIGH GAS PRESSURE
X4-15 X4-6
CONDENSATE
(OPTIONAL)
X4-18 X4-9
MAIN VALVE
TB1-7
FLAME
ROD
M1
A
R1
120N 120N
24N
HEAT DEMANDS
(24VDC)
BOILER PUMP
(NOT INCLUDED)
SYSTEM PUMP
DRY CONTACT
DHW PUMP
DRY CONTACT
MRHL
(OPTIONAL)
X4-13
LOW GAS PRESSURE
X4-16
SPARE
X4-19
UNLESS OTHERWISE SPECIFIED:
TOLERANCES ARE:
DECIMALS .X
DECIMALS .XX
DECIMALS .XXX
ANGLES 1
MATERIAL:
Page 49
BLOWER MOTOR
POWER SWITCH
POWER INDICATOR
LOW VOLTAGE PANEL
ENCLOSURE FAN
BLOWER CONTACTOR
TB 120VAC TB 120VAC
24VAC TRANSFORMER
TB 24VAC
SAFETY CHAIN
(24VDC)
FACTORY
INSTALLED
DO NO
THIRD A
.1
FRACTIONS 1/8"
DIMENS
.03
.010
2
TB1-17
TB1-18
TB1-19
TB1-20
TB1-21
TB1-22
TB1-23
TB1-24
TB1-25
TB1-26
TB1-27
TB1-28
TB1-29
TB1-30
TB1-31
TB1-32
TB1-33
TB1-34
TB1-35
TB1-36
TB1-37
TB1-38
TB1-39
TB1-40
TB1-41
TB1-42
TB1-43
TB1-44
TB1-45
TB1-46
TB1-47
TB1-48
TB1-49
TB1-50
TB1-51
TB1-52
TB1-53
TB1-54
TB1-55
TB1-56
TB1-57
TB1-58 TB1-58
TB1-59 TB1-59
TB1-60 TB1-60
TB1-61
TB1-62
X1-1
X1-14
X1-2
X1-1
X1-15
X1-3
X1-13
X1-1