Ladder Diagram - Lochinvar 400 Installation & Operation Manual

13
Diagrams
Figure 13-2 Ladder Diagram
120VAC
TERMINAL STRIP
120V SUPPLY "L"
ON / OFF
SWITCH
PC INTERFACE
SYSTEM
SENSOR
OUTDOOR
SENSOR
TANK
SENSOR
SHIELD
CASCADE
SHIELD
BMS
IN
SYS PUMP
IN
BLR PUMP
OUT
RATE
OUT
SHIELD
MODBUS
SHIELD
78
JUNCTION BOX
INTEGRATED CONTROL
1
X1-6 F2 X1-1
3.15A
F1 X1-2
5A
SYSTEM PUMP
SYSTEM PUMP
RELAY
RELAY
X1-3
DHW PUMP DHW PUMP
RELAY
RELAY
X1-4
BOILER PUMP BOILER PUMP
RELAY RELAY
F3
.8A
24V DC
SUPPLY
X5-9 X5-1
120 VAC
X4-3
24 VAC
3.5A
KB 801 ONLY
CN5-5
LWCO
CN7-1 CN7-4
CN7-3 CN7-2
CONNECTION BOARD
RIBBON CABLE
X5-6
S2
INLET
SENSOR
X5-4
S1a
OPERATING
SENSOR
1
X5-12
S1b
HIGH LIMIT
SENSOR
2
X5-5
S3a
FLUE
SENSOR
6
X5-13
S3b
FLUE
SENSOR X5-14
13
CONNECTION
BOARD
CN5-1 X4-7
1
ALARM
CONTACTS
CN5-8 X4-14
2
CN5-2 X4-6
3
RUN-TIME
CONTACTS
CN5-9 X4-13
4
S6 CN6 X6
21
CN6 X6
22
S5 CN6 X6
23
24
CN3-9
S4 X4-9
26
CN3-6 X4-6
27
29
CN6 X6
A 30
CN6
X6
B 31
CN6 X6
32
CN6 X6
+
33
0-10V
- CN6 X6
34
CN6 X6
+ 35
0-10V
CN6
- X6
36
CN6 X6
+ 37
0-10V
CN6 X6
- 38
CN6 X6
+ 39
0-10V
-
40
M
41
O
42 CN8-1 X6-1 X4-1 X9-2
A
D
CN8-2 X6-2 B X4-2 X9-1
43
B
U
CN8-3 X6-3 X4-3 X9-3
44
S
NEUTRAL
TERMINAL STRIP
120V SUPPLY "N"
L
IN
GROUND
SYSTEM
PUMP
CONTACTS
BLOWER
2
3 BOILER
PUMP
CONTACTS
DHW
PUMP
CONTACTS
RELAY BOARD
CONNECTION BOARD
FLOW
11 SWITCH 12
ROOM
THERMOSTAT 1
19 20
ROOM
THERMOSTAT 2
17
18
ROOM
THERMOSTAT 3
15
16
TANK
THERMOSTAT
13
14
LOW GAS HIGH GAS
PRESSURE PRESSURE
SWITCH SWITCH
10 9
INTEGRATED
CONTROL LOUVER
5
RELAY COIL
24VAC 6
LOUVER
7
PROVING SWITCH
X7
8
BLOCKED
DRAIN SWITCH
AIR PRESSURE
SWITCH
GAS VALVE
BLOWER
SPARK
ROD
CAUTION HIGH VOLTAGE SPARK LEAD
NOTES:
1. Where possible, switches are shown without utilities (gas, water or
electricity) connected to the unit. As such, actual switch states may
vary from those shown on diagrams depending upon whether utilities
are connected or a fault condition is present.
2. See wiring diagram for additional notes.
Installation & Operation Manual
L
OUT
SYSTEM
PUMP
BOILER
PUMP
DHW
PUMP
INTEGRATED
CONTROL
CN5-14 X4-8
CN5-10 X4-12
CN5-7 X4-1
CN5-13 X4-9
CN5-6 X4-2
CN5-12 X4-10
CN5-11 X4-11
CN5-3 X4-5
CN5-4 X4-4
X5-2
X5-10
X5-11
X2-2
GAS VALVE
RELAY
X2-1
1 X5-7
2 X5-16
4 X5-8
5 X5-15
TR2
X1-7
FLAME ROD
BOX DEPICTS
OPTIONAL ITEMS
LOW VOLTAGE
120 VAC
HIGH VOLTAGE

LADDER DIAGRAM

LBL20141 REV B