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12 Ladder diagram
L
BOILER
SUPPLY
LOUVER
CONTACTS
BLOWER
RELAY
LOUVER
RELAY
PROOF OF
CLOSURE RELAY
PROOF OF
CLOSURE VALVE
BLOWER
1
2
3
N
G
BOILER
SUPPLY
PUMP
SUPPLY
L
IN
SYSTEM
PUMP
RELAY
OUT
SYSTEM
PUMP
BOILER
PUMP
DWH
PUMP
IN
OUT
IN
OUT
BOILER
PUMP
RELAY
DWH
PUMP
RELAY
PUMP
SUPPLY
N
ON/OFF
SWITCH
SILENCE
SWITCH
ALARM
ALARM
CONTACTS
X3-4X3-3
X1-6
F5
5A
F3
3.15A
X1-1
SYSTEM PUMP
RELAY
BOILER PUMP RELAY
DHW PUMP RELAY
BLOWER RELAY
X1-2
X1-4
X2-7
X1-3
X1-12
HSI
X2-2
X2-1
F2
5A
F2
X2-6
GAS VALVE
X2-3
X3-1
X3-2
RUN-TIME
CONTACTS
F7
1.6A
X1-7 X1-5 X1-8 X1-10
X6-18
X6-17
X6-9
X6-8
1
2
4
5
BLOWER
X6-1
X6-3
LOW PRESSURE
AIR SWITCH
X6-10
CN2-1
CN2-2
220
Ω
,5W
220
Ω
,5W
X6-12
MANUAL RESET
HIGH LIMIT
X6-4
X6-13
PROOF OF
CLOSURE RELAY
PROOF OF
CLOSURE
SWITCH
LOW GAS
PRESSURE SWITCH
HIGH GAS
PRESSURE SWITCH
LOUVER
RELAY
X6-5
X6-14
CN2-8
10
9
CN2-9
LOUVER
PROVING
SWITCH
CONNECTION
BOARD
BLOCKED
DRAIN
SWITCH
AUTO-RESET
HIGH LIMIT
X6-15
X8-9
X8-10
X8-20
X8-19
CN1-7
CN1-6
11
12
13
14
RS232
PORT
220
Ω
,5W
X5-1
X5-5
X5-2
X5-6
X5-3
X5-7
X5-4
X5-8
X6-6
X6-16
X6-7
X6-11
X6-2
CN2-11
CN2-12
CN2-6
CN2-5
2
4
5
6
21
22
23
24
25
26
27
28
ENABLE
TANK
THERMOSTAT
3-WAY VALVE
COM
OP
CL
24V
7
3
1
CN2-4
CONNECTION
BOARD
CN1-10
CN1-9
CN1-1
CN1-2
CN1-3
X8-12
X8-13
X8-14
X8-11
X8-1
TANK
SENSOR
SYSTEM
RETURN
SENSOR
SYSTEM
SUPPLY
SENSOR
OUTDOOR
SENSOR
CONNECTION
BOARD
X8-2
X8-3
X8-4
OUTLET
SENSOR
INLET
SENSOR
FLUE
SENSOR
INTERGRATED
CONTROL
BOARD
BOX DEPICTS
OPTIONAL ITEMS
120 VAC
LOW VOLTAGE
8
TERMINAL
STRIP
1
2
3
3
1
CONNECTION
BOARD
21 3
CN1-8
CN1-16
CN2-7
1
2
CHASSIS
4
X8-5
X8-15
CN1-12
CN1-11
X8-7
X8-17
CN1-15
CN1-14
X8-18 CN1-13
15
16
17
18
MODEL DPENDENT
CASCADE
0-10VDC
20
19
ALARM RELAY
VENTILATION FAN
ALARM
CONTACTS
ALARM
RELAY
CHASSIS
CONNECTION
BOARD
CN2-10
FLOW
SWITCH
6
4
5
J3-6
J3-4
J3-5
J3-2
J3-3
J2-3
J2-2
J2-1
TEST
RESET
2
3
LWCO
PROBE
LOW WATER
CUTOFF
1.6A
24VAC
(
(
(
(
(
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. SEE WIRING DIAGRAM FOR ADDITIONAL NOTES.
LBL2366 REV A
Installation & Operation Manual