Installation / Operation Instruction Manual

Page 28
BRADFORD WHITE CORP .
Figure 20. Ladder Diagram.
SYSTEM
SENSOR
FLAME
ROD
HI LIMIT
SWITCH
BLDG MGMT
SYSTEM IN
FIELD
INTERLOCKS
AIR
PRESSURE
SWITCH
OUTDOOR
SENSOR
H-X/DHW
SENSOR
TANK
AQUASTAT
COND.
LEVEL
SWITCH
BLOCKED
VENT SW
HI-LO GAS
PRESS SW
WATER
PRESS
SWITCH
X11-7
X2-3
X11-14
X2-6
24
VAC
FLOW
SWITCH
CIRCUIT
BREAKER
ON/0FF
SWITCH
IMPORTANT NOTE
Maximum COMBINED load
on Terminals PWB 4, 6
and 8 shall NOT exceed
5 Amps
PWB
120VAC NEUTRAL
BLOWER
MAIN CONTROL
120 VAC
24 VAC
PWB-3 PWB-2 PWB-1
X3-4
F3
X11-10
SUPPLY
24VDC 800mA
F1
5A
5A
F2
X3-12
BOILER PUMP
R
R
SYSTEM PUMP
X3-7
X3-6
RELAY
DHW PUMP
RELAY
PWB-4
PWB-6
PWB-8
INLET PROBE
FLUE TEMP
FLUE SAFETY
OPERATING CONTROL
SAFETY LIMIT
H-X/DHW SENSOR
X4-3
X4-9
X4-2
X4-8
X4-1
X3-15,PWB-9
X3-14,PWB-7
X3-5
X3-13,PWB-5
X4-7
FLOW SENSOR
X4-10
X4-4
X4-5
X4-11
X4-12
X11-11
X11-13
X11-5
X11-12
X11-4
X11-6
X11-9
X11-8
X11-1
X11-2
BLOWER
X6-4
FWB1
X6-12
X6-5
X6-13
X6-6
X6-14
X6-7
X6-15
FWB2
FWB3
FWB4
FWB5
FWB6
FWB7
FWB8
FWB9
FWB10
FWB11
X4-4
X4-10
X5-6
X5-3
X5-1
X5-8
X5-5
X1-2
X1-1
X1-3
FWB12
FWB13
FWB14
FWB15
FWB16
FWB17
FWB18
FWB19
0-10 VDC IN
+
-
+
-
0-10 VDC OUT
RATE OUT
GROUND
SHIELD
SHIELD
RS485A
RS485B
CASCADE
SPARE
BY OTHERS
X6-2
X6-10
C
GAS VALVE
X2-1
X2-4
X6-1
X6-9
X11-3
LWCO
X11-7
X11-14
X1-4
X3-10
TR2
T2
CAUTION - HIGH VOLTAGE SPARK WIRE
X4-5
X4-11
X4-12
FLOW SENSOR
MAIN CONTROL FWB
X3-8
USED ON LABEL H2365000
SHEET 1 OF 2
B
CD 5-22-14
C
INTENDED SIZE:
D
C
B
A
B
C
D
1
2
3
4
REV.
JAB 12/4/13
CJ 12/4/13
ENGR
APPR
4
3
DRAFT
2
APPROVALS
1
JM 5-22-14
C
GRAPHIC CORRECTION
CHECK
DRAFT
ECN
ENGR APPR
APPR
BY LAARS HEATING SYSTEMS CO.
CHANGE:
14-016N-08
REV.
DISCLOSED TO OTHERS FOR MANUFACTURING OR ANY OTHER
.010
REVISIONS
PURPOSE EXCEPT AS SPECIFICALLY AUTHORIZED IN WRITING
N/A
FRACTIONS 1/8"
1
DWG. NO:
FINISH
E23587
TITLE:
SOFTWARE
TOLERANCES ARE:
REPRODUCED, TRANSFERRED TO OTHER DOCUMENTS, USED OR
DECIMALS .XXX
.1
S
N/A
DECIMALS .XX
MATERIAL:
LADDER DIAGRAM, MASCOT LX
.03
DECIMALS .X
DIMENSIONS ARE IN INCHES.
UNLESS OTHERWISE SPECIFIED:
THIS DOCUMENT AND THE INFORMATION CONTAINED HEREIN ARE
PROPRIETARY TO LAARS HEATING SYSTEMS CO.AND SHALL NOT BE
ANGLES
DO NOT SCALE DRAWING.
THIRD ANGLE PROJECTION.
SCALE: NONE
7.9 Ladder Diagram, Connections, and Wiring Diagrams
(see Figure 20 thru Figure 22)