Hydronic Heating Boilers and Domestic Water Heaters Installation and Service Manual
50
CN9
TEST
SWIT CH
T
RESET
T
PROB E
~
~
~
~
~
~
~
~
~
~
~
~
2C 2NO
STAGE #2
HIGH FIRE
B3
B1 B2
FIELD SUPPLIED
SAFETY DEVICES
INTERMITTENT
ALARMS
A1 A2
1C 1NO
24
VAC
120
VAC
-
+
HI-LIMIT
Line
BL
BR
ON/OFF
POWER
SWITCH
BK
AUX. HI-
LIMIT
OPERATOR
S2/FS
F2
F1
LINE
S1
RESETS
T/
W
O
BK
NEU
IGNITER
TRIAL
GY
5
4
1
2
3
11
-
+
-
+
BL/W
IGNITION
MODULE
GY
GY
GY
FLAM E CUR RENT TEST PINS
BL
Y
1
2
CIRCUIT
BREAKER
BK
W
BK
LOW FIRE VALVE(S)
YR
NC
NO
C
LOW AIR
INLET
PROBE
SYS/
TANK
SETPOINT
DIFFERENTIAL
HIGH-FIRE
OFFSET
CN1
CN2
CN3
CN4
CN5
CN6
INLET
SENSOR
W
LOW
HIGH
Y
FACTORY FLOW SWITCH
STAGE #1
LOW FIRE
Y
Y
BL
BL
NO
NC
HIGH/LOW FIRE & BLOWER
SPEED CONTROL RELAY
LOUVER/
POWER
VENTER
CONTACTS
LOUVER
PROVIN G
HiGas
LoGas
Neutral
PR
PR
PR PR
PR
~
~
~
~
~
~
FIELD SUPPLIED
SAFETY DEVICES
CONTINUOUS
ALARMS
CN7
CN8
SYSTEM/TANK
SENSOR
CHASSIS
GROUND
Ground
NC
NO
C
HL
Y
YR/BK
CN9
BR
BR
Y
BL
O/
BK
W
BK BK
W
G
Y
BL
R/BK
R/BK Y
R
BK/W
BK/
W
W
A3
BR
O
PR PR
1
2
3
4
1
2
BK
P
O
PURGE
HIGH FIRE VALVE(S)
R/BK
STATUS
STAGE #2 LED
OFF
O
PR
BL & Y = 24VAC
YR
C
LR
R
R
= RELAYS LOCATED ON CONTROL
PANEL
= RELAYS LOCATED IN WIRING BOX
= LEDS LOCATED ON DISPLAY BOARD
= OPTIONAL DIN RAIL CONNECTORS
LOCATED IN ELECTRICAL WIRING BOX.
G
PU
BK
BK
PUMP
OPTIONAL ON
BOILER
BR
BR
PUMP RELAY
DC 24V COIL
TO
A1 B1A2 A3 B2 B3
CONTINUOUSLY
MONITORED
INTERMITTENTLY
MONITORED
FIELD INSTALLED
SAFETY DEVICES
NOTE:
SHOW N W IT H SHORTI NG
BARS REMOVED AND ATTACHED
DEVICES IN NON-ALARM STATE.
CONTINUOUS INTERMITTENT
COM COM
FAIL
OK OK
FAIL
HIGH/LOW GAS, AUX. HI-LIMIT
AUX. LIMITS, EXT. FLOW SWITCH
EXAMPLE DEVICES:
PR
PR
R/BK
R
R
STAGE #1 LED
Y
R
BK
R/BK
R
PR/BK
OPTIONAL
I/O RESET
BOARD
BOILER ONLY
2-STAGE THERMOSTAT
O/BK
O
P
W
TH
10
PI
9
8
24COM
RESET
7
24VAC
6
R
MV
5
PS
4
3
M/S
2
FF
1
BLOWER
Y
R
BURNER
GROU ND
RT
RUN-TIME RELAY
NO
C
RUN-TIME
CONTACTS
P
P
PR
CONTACTS
ANY FAILURE
PR
ALARM
CONTACTS
OPTIONAL
ALARM BELL
BL
Y
TD
BL
R
R
SILENCE
Y
Y
BL
Y
PR
FFR
P
LBL20014 REV- A
PR/
BK
PR Y
AL
Y
ALARM
PR
PR/
BK
BL
PR/
BK
Y
SHUTDOWN
O.A. MA X. RATI O
O.A.
DISABLE
SHUTDOWN
ON
O.A.
SENSOR
PR/BK
PR/BK
CONNECTS HERE
SENSOR
(1) WHERE POSSIBLE, ALL SWITCHES AND CIRCUITRY ARE SHOWN IN THEIR AT REST STATES.
NOTES:
(2) ADDITION OF ENERGY MANAGEMENT SYSTEMS OR OPTIONAL LIMIT SWITCHES TO THE TERMINAL
(3) SCHEMATIC IS WIRING DIAGRAM
, REFER TO ACTUAL COMPONENTS FOR EXACT TERMINAL LOCATIONS.
(4) WHEN REPLACING DAMAGED WIRING, USE EQUIVALENT TYPE AND GAUGE.
STRIP REQUIRE THE REMOVAL OF SOME OF THE SHORTING BARS FROM THE TERMINAL STRIP
.
WARNING:
THIS HEATER MAY BE CONNECTED TO ONE OR
MORE BRANCH CIRCUITS. TO PREVENT ELECTRICAL SHOCK,
ENSURE ALL
BRANCH CIRCUITS ARE DE
-ENERGIZED BEFORE
ATTEMPTING TO SERVICE THIS EQUIPMENT.
DOTTED LINE
INDICATES OPTIONAL
EQUIPMENT
ITEM INDICATES
CL OSED END SPLIC E
JUN CTI ON POI NT
(ELECTRICALLY SAME)
T= TA N
Y=YELLOW
BR=BROWN
G=GREEN
GY=GRAY
W = WHITE
BK = BLACK
PR=PUR PLE
BL=BLUE
P=PI NK
O=OR AN GE
Y/G = YELLOW WI TH GR EEN STR IPE
R= RED
BL
T
CONTACTS
ANY FAILURE
OPTIONAL
OPTIONAL
OPTION AL
OPTIONAL
ENAB LE
CN7
O/BK
120 VAC
15AMPS
60Hz
BL
BL
Y
Y
CHASSIS
GROUND
BLANK COVER
PROVIDED IF
NO I/O RESET
OPTION IS
PROVIDED
NO
NC
C
2
1
NO
NC
C
C
C
C
NO
NC
NO
NC
C
NO
NC
NO
C
C
P
NO
GY
GY
W2
W1
W3
C
TO POWER
SOURCE
W
J3
5
4
6
1
2
3
O.C.
J1
J2
321
J4
P
BL/
BK
PR
PR
T
BL
PR
BL/
BK
O
O
GND
RESET
Y
24 VA C
LWCO
SCHEMATIC AND WIRING DIAGRAM
MODELS 985,000 - 2,065,000 BTU/HR