Hydronic Heating Boilers and Domestic Water Heaters Installation and Service Manual

47
SCHEMATIC DIAGRAM
MODELS 495,000 - 745,000 BTU/HR
J3
54
6
3
2
1
O.C .
J1
J2
3 2 1
J4
P
OPERATOR
INLET
PROBE
SYS/
TA NK
SETPOINT
CN1
CN2
CN3
CN4
CN5
CN6
CN7
CN8
CN9
OFF
DIFFERENTIAL
HIGH-FIRE
OFFSET
SHUTDOWN
O.A. MAX. RATIO
O.A.
DISABLE
SHUTDOWN
ON
SENSOR
ENABLE
CN1
INLET
SENSOR
BK
BK
SYSTEM/TANK
SENSOR
PR PR
3
2 4 1
S2/FS
F2 F1
LINE
S1
FLAME FAILURE RESET
T
NEU
TRIAL
GY
5
4
1
2
-
+
BL/W
IGNITION
MODULE
GY
GY
GY/W
FLAME
CURRENT
TEST PIN S
BL
G
LOW FIRE VALVE
YR
LOW AIR
Y
R
Y
BL
HIGH FIRE VALVE
Y
G
PU
O O
PUMP RELAY
DC 24V COIL
PU/W
TH
10
9
8
24COM
RESET
7
24VAC
6
RMV
5
PS
4
FF
1
BLOWER
BURNER GROUND
BL
R
R
HEATING
R2 W2
R/O
PV
MV
PV
MV
O
FLAME FAILURE
XB
O/W
G
W
W
BK
W
BR
SHUTOFF/
SOLENOID
NORMALLY OPEN
VENT VALVE
ACC.
PLUG
FLASH
CODE LED
W
BR
BR
W
120
VAC
Line
POWER SWITCH
BK
W
Neutral
CHASSIS
GROUND
Ground
W
BK
W
G
Y
R1 W1
HI-LIMIT
COM
OPTIONAL
AUX. LIMIT
NC
NC
O
Y
C
Y
HiGas
LoGas
C
FIELD
OPTIONS
C
O
R
R/O
PU
T
Y
Y
Y
NOT
USED
PUMP
OPTIONAL
ON BOILER
W
C
NO
BK
BK
24 GND
INTERMITTENT
FLOW SWITCH
LBL20034 REV A
NO
PV/MV PV/MV
R
2
1
OPTIONAL
I/O RESET
O.A.
SENSOR
NC
O/W
LOW AIR
IND.
CONTINUOUS FLOW SWITCH
DISCONNECT POWER BEFORE SERVICING THE UNIT
FIELD PROVIDED
REMOTE OPERATOR
BL
BR
120VAC/60HZ
SCHEMATIC/LADDER DIAGRAM
DOTTED LINE
INDICATES OPT IONA L
EQUI PMENT
ITEM INDICATES
CL OSED END SPL ICE
JUNCTION POINT
(ELECTRICALLY SAME)
T=TAN Y=YELLOW
BR=BROWN G=GREEN GY=GRAY
R=RED
W = WHITE BK = BLACK
PR=PURPLE BL=BLUE P=PINK
O=ORANGE
FIELD PROVIDED
REMOTE OPERATOR
C
O
O
OPEN
LOUVER
IGNITER
O
2
1
BK/W
3
W
BL
24VAC
BL
24VCOM
BL
COM
COM
NO
COM
NO
R/O R/O
HI-LOW FIRE
FULL-FIRE STANDARD
R
BR
L
W
BK
BK
C
NO
120V NEUTRAL
IGNITION
MODULE "F2"
W
BK
BK
120VAC POWER
TO LOUVER OR
DAMPER
"B"
"X"
"FIELD PROVIDED LOUVER PROVING SWITCH"
C
OPEN
CLOSED
OPTIONAL LOUVER-
VENTER CONTACTS
OPTION BOX "A", "B" OR "C"
ALARM
CONTACTS
T
O/W
G
TD
BR
BR
BR
R
R
Y
C
R R
W
OPTIONAL ALARM ON ANY FAILURE
NC
IGN MODULE PIN 5 (MV)
24V COM
O
OPERATOR CN1 (4)
C
NO
C
NO
OPTIONAL
24VAC ALARM BELL
O
OPTION BOX "C" ONLY
Y
BR
Y
SILENCE
OPTIONAL
LWCO OR LWCO
WITH ALARM
RESET
PR
PR
O
PR
TEST SWITCH
T
PROBE
P
G
LWC O IN D.
"R1"
"C"
MF
BL
O
LWC O
ALARM
CONTACTS
Y
R
BR
BR
R
R
C
NO
BR/W
24V COM
OPTION BOX "B" OR "C"
R/O
T
PR
BL
Y
24 V C OM
24 V C OM
RES ET
GND