Diagrams; Ladder Diagram - Lochinvar WH 55-399 Installation & Operation Manual

13

Diagrams

Figure 13-1 Ladder Diagram
120VAC
KB ONLY
PC INTERFACE
SYSTEM
SENSOR
OUTDOOR
SENSOR
SENSOR
CASCADE
SYS PUMP
BLR PUMP
MODBUS
78
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
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
X4-14
2 CN5-8
CN5-2 X4-6
3
RUN-TIME
CONTACTS
CN5-9
X4-13
4
S6 CN6 X6
21
CN6 X6
22
CN6
S5 X6
23
24
S4 CN3-9 X4-9
26
TANK
CN3-6 X4-6
27
29
SHIELD
CN6
X6
30
A
CN6 X6
31
B
CN6 X6
SHIELD 32
CN6
X6
BMS + 33
0-10V
- CN6 X6
IN 34
CN6 X6
+ 35
0-10V
IN
- CN6 X6
36
CN6
X6
+ 37
0-10V
OUT CN6 X6
- 38
CN6 X6
+ 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
CN8-3 X6-3 X4-3
44
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
HEAT/LOOP 3
DEMAND
15
16
TANK
THERMOSTAT
13
14
LOW GAS HIGH GAS
PRESSURE PRESSURE
SWITCH SWITCH
10
9
INTEGRATED
CONTROL LOUVER
5
RELAY COIL
6
24VAC
LOUVER
7
PROVING SWITCH
X7
8
BLOCKED
DRAIN JUMPER
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.
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
X4-1
CN5-7
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

LBL20170 REV A