Lochinvar Knight 81 Instructions Manual page 34

10
Diagrams
Figure 10-5 Ladder Diagram_Armor / Armor Wall Mount
120VAC
PC INTERFACE
SENSOR
CASCADE
MODBUS
34
JUNCTION BOX
TERMINAL STRIP
120V SUPPLY "L"
INTEGRATED CONTROL
ON / OFF
SWITCH
X1-1
X1-6 F2
X1-2
3.15A
F1
5A
BUILDING
RECIRC PUMP
RELAY
DHW PUMP
RELAY
X1-3
F3
.8A
24V DC
SUPPLY
X5-9 X5-1
120 VAC
X4-3
24 VAC
3.5A
AW 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
1 SENSOR
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
S4 CN3-9 X4-9
16
TANK
CN3-6
X4-6
17
19
SHIELD
CN6 X6
20
A
CN6 X6
21
B
CN6 X6
SHIELD 22
CN6 X6
BMS + 23
0-10V
CN6
- X6
IN 24
CN6 X6
+
25
RATE
0-10V
OUT - CN6 X6
26
M
27
SHIELD
O
CN8-1 X6-1 X4-1 X9-2
28
A
D
CN8-2 X6-2 B X4-2
29 X9-1
B
U
CN8-3 X6-3 X4-3 X9-3
30
SHIELD
S
ModBus and BACnet Communication Instructions
TERMINAL STRIP
120V SUPPLY "N"
1
BLOWER
GND
SYSTEM
SYSTEM
PUMP "L" PUMP "N"
GND
BUILDING
RECIRC
PUMP
DHW
PUMP
DHW
DHW
PUMP "L"
PUMP "N"
TERMINAL TERMINAL
STRIP STRIP
CONNECTION BOARD
FLOW CN5-14
11 SWITCH
12
CN5-10
TANK
THERMOSTAT
CN5-12
13
14
LOW GAS HIGH GAS
PRESSURE PRESSURE
SWITCH SWITCH
CN5-11
10
9
CN5-3
LOUVER
5
RELAY COIL
INTEGRATED
6
CONTROL 24VAC
LOUVER
7
PROVING SWITCH
CN5-4
8
X7
BLOCKED
DRAIN SWITCH
AIR PRESSURE
SWITCH
GAS VALVE
BLOWER
FLAME ROD
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.
NEUTRAL GROUND
2
3
INTEGRATED
CONTROL
X4-8
X4-12
X4-10
X4-11
X4-5
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
BOX DEPICTS
OPTIONAL ITEMS
LOW VOLTAGE
120 VAC
HIGH VOLTAGE
LADDER DIAGRAM
LBL20149 REV B