Diagrams; Ladder Diagram - Lochinvar 81 - 286 Installation And Operation Manual

13

Diagrams

Figure 13-1 Ladder Diagram
120VAC
KB ONLY
PC INTERFACE
OUTDOOR
CASCADE
SYS PUMP
BLR PUMP
MODBUS
JUNCTION BOX
TERMINAL STRIP
120V SUPPLY "L"
INTEGRATED CONTROL
ON / OFF
SWITCH
X1-6 F2 X1-1
3.15A
F1
5A
SYSTEM PUMP
RELAY
BOILER PUMP
RELAY
DHW PUMP
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
S2
INLET
SENSOR
S1a
OPERATING
1 SENSOR
S1b
HIGH LIMIT
SENSOR
2
S3a
FLUE
SENSOR
6
S3b
FLUE
SENSOR
13
CONNECTION
BOARD
CN5-1
1
ALARM
CONTACTS
CN5-8
2
CN5-2
3
RUN-TIME
CONTACTS CN5-9
4
S6 CN6
21
SYSTEM
SENSOR CN6
22
CN6
S5
23
SENSOR
24
CN3-9
S4
26
TANK
SENSOR
CN3-6
27
29
SHIELD
CN6
30
A
CN6
31
B
CN6
SHIELD 32
CN6
BMS + 33
0-10V
- CN6
IN 34
CN6
+ 35
0-10V
IN CN6
-
36
CN6
+ 37
0-10V
OUT CN6
- 38
CN6
+ 39
RATE
0-10V
OUT -
40
M
41
SHIELD
O
CN8-1 X6-1 X4-1
42
A
D
CN8-2 X6-2 B X4-2
43
B
U
44 CN8-3 X6-3 X4-3
SHIELD
S
GND
SYSTEM SYSTEM
PUMP "L" PUMP "N"
X1-2
GND
SYSTEM
PUMP
BOILER
BOILER
PUMP "L" PUMP "N"
X1-4
GND
BOILER
PUMP
DHW
DHW
PUMP "L"
PUMP "N"
X1-3
TERMINAL TERMINAL
STRIP DHW STRIP
PUMP
CONNECTION BOARD
FLOW
11 SWITCH 12
HEAT/LOOP
1
DEMAND
19 20
HEAT/LOOP 2
DEMAND
17
18
3
HEAT/LOOP
DEMAND
15
16
TANK
THERMOSTAT
13
14
LOW GAS HIGH GAS
PRESSURE PRESSURE
SWITCH SWITCH
10
INTEGRATED
LOUVER
CONTROL
RELAY COIL
24VAC
LOUVER
PROVING SWITCH
X7
KB 286 ONLY
O-TEMP HEX SW
X5-6
AIR PRESSURE
X5-4
SWITCH
X5-12
GAS VALVE
X5-5
X5-13
X5-14
BLOWER
X4-7
X4-14
X4-6
X4-13
X6
X6
X6
SPARK
ROD
X4-9
X4-6
CAUTION
X6
X6
NOTES:
X6 1. Where possible, switches are shown without utilities (gas, water or
electricity) connected to the unit. As such, actual switch states may
X6
vary from those shown on diagrams depending upon whether utilities
X6
are connected or a fault condition is present.
X6
2. See wiring diagram for additional notes.
X6
X6
X6
X6
X9-2
X9-1
X9-3
Installation & Operation Manual
NEUTRAL GROUND
TERMINAL STRIP
120V SUPPLY "N"
1 2
BLOWER
3
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
9
CN5-3 X4-5
5
6
7
CN5-4 X4-4
8
X5-2
BLOCKED
X5-10
DRAIN SWITCH
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
HIGH VOLTAGE SPARK LEAD
BOX DEPICTS
OPTIONAL ITEMS
LOW VOLTAGE
120 VAC
HIGH VOLTAGE

LADDER DIAGRAM

LBL20148 REV C
77