Lochinvar Knight 81 Instructions Manual page 39

10
Diagrams
Figure 10-10 Ladder Diagram_FTXL
120VAC
ON / OFF
SWITCH
SYSTEM
SENSOR
OUTDOOR
SENSOR
DHW RECTRC
SENSOR
TANK
SENSOR
SHIELD
CASCADE
SHIELD
BMS
SYS PUMP
BLR PUMP
OUT
RATE
OUT
SHIELD
MODBUS
SHIELD
(continued)
JUNCTION BOX
TERMINAL STRIP
120V SUPPLY "L"
BLOWER BLOWER
1
RELAY
INTEGRATED CONTROL
X1-1
X1-6 F2
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
F3 RELAY
.8A
24V DC
X4-3 SUPPLY
X5-9
X5-1
120 VAC
3.5A
24 VAC
CONNECTION BOARD
CN5-5
FLOW
SWITCH
13
13
HEAT/LOOP
1
DEMAND
19
21
HEAT/LOOP 2
DEMAND
17
19
HEAT/LOOP 3
DEMAND
17 15
TANK
THERMOSTAT
13
15
15
LOW GAS HIGH GAS
PRESSURE PRESSURE
SWITCH SWITCH
12 10
CONXUS
BIC
DU
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
CN5-9 X4-14
2
CN5-2 X4-6
3
RUN-TIME
CONTACTS
CN5-9
X4-13
4
S6 CN6 X6
23
24 CN6 X6
S5 CN6 X6
25
26
S7 CN6 X6
27
CN6 X6
28
S4 CN6 X6
29 29
CN6 X6
30
31
CN6 X6
A 32
CN6 X6
33
B
CN6 X6
34
CN6 X6
+ 35
0-10V
- CN6 X6
IN 36
CN6 X6
+ 37
0-10V
IN
- CN6 X6
38
CN6 X6
+ 39
0-10V
- CN6 X6
40
CN6 X6
+ 41
0-10V
-
42
M
43
O
CN8-1 X6-1 X4-1 X9-2
44
A
D
CN8-2 X6-2 B X4-2 X9-1
45
B
U
CN8-3 X6-3 X4-3 X9-3
46
S
ModBus and BACnet Communication Instructions
NEUTRAL
TERMINAL STRIP
120V SUPPLY "N"
L
IN
GROUND
2
SYSTEM
CONTACTS
3
BLOWER
RELAY
CONTACTS
CONTACTS
RELAY BOARD
J3-6
LWCO LWCO
J3-5 BOARD BOARD
CN5-15
TEST
LWCO
14
J3-3
SWITCH
PROBE
J2-1
LWCO RESET
J2-2
22
20
18
18
16
RECIRC PUMP
5
RELAY COIL
6
24VAC
6
11 11 9
LOUVER
7
RELAY COIL
INTEGRATED
24VAC 8
CONTROL
LOUVER
9
PROVING SWITCH
X7
X7
10
BLOCKED
DRAIN 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.
L
OUT
PUMP
SYSTEM
PUMP
BOILER
PUMP
BOILER
PUMP
DHW
PUMP
DHW
PUMP
INTEGRATED
CONTROL
J3-4
X4-8
J3-2 X4-12
CN5-7 X4-1
CN5-6 X4-9
CN5-14 X4-2
CN5-13 X4-10
CN5-16
X5-3
CN5-11
X4-11
CN5-3 X4-5
DAMPER RELAY
FLUE DAMPER
2 1
M
3
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
LBL20427 REV C
39