Install Instructions

50
Installation & Service Manual
Schematic Diagram - M9 Unit
45,000 - 260,000 Btu/hr Models
BOX DEPICTS
OPTIONAL ITEMS
120V
NEUTRAL
GROUND
24VDC RELAY
PUMP DELAY
24VAC RELAY
BYPASS PUMP
CIRCULATION
PUMP
BYPASS PUMP
MOT
MOT
120V
TRANSFORMER
24V
1
R1
W1
THERMOSTAT
LOW WATER
CUTOFF
3
4
ROLLOUT
SWITCH
MANUAL
RESET
HIGH LIMIT
SPILL
SWITCH
24VAC RELAY
R
X
B
CN1-4
OPERATOR
CN1-3
FLOW
SWITCH
VENT
DAMPER
4
IGNITION
MODULE
24V
PV
MV
GAS VALVE
PV
MV
C
PILOT
LOW
HIGH
OPERATOR
CN2-1
CN2-2
GND
BURNER
GND
2
PILOT
SPARK
CN3
CN4
INLET SENSOR
CN5
CN6
24VDC RELAY
PUMP DELAY
CN7
CN8
C
1
C
NO
W
PK
BK
BL
G
LBL20293 REV A
AUTO-RESET
HIGH LIMIT
HIGH
FIRE
W2
R2
1
V
P
VENTER
PROVING
VENTER RELAY
BL
Y
R
TANK
AQUASTAT
Y
Y
Y
BL
W
OPERATOR
CN12-3
CN12-2
CN12-1
W BN
BN
PR
PR
Y
PR
PR
PR
T
PR
PR
PR
POWER
VENTER
BK
3
5
R
C
Y
GY
GY
BL
IGNITION
MODULE
Y
MV/
PV
W
P
R
R
OR
BK
BK
SYSTEM SENSOR
OUTDOOR SENSOR
CN10-1
CN10-2
POWER VENTER
CN11-1
CN11-2
Y
PK
BK
BK
PK
BK
W
W
BK
BL
CN1-1 CN1-2
2
BL
BN
PR
LOW WATER
CUTOFF
G
BL
T
T
R
T
CHASSIS
GROUND
GROUND
120V
LINE
120V
GROUND
BYPASS PUMP
VENT
DAMPER
GY
R
T
W
Y
=
=
=
=
RED
TAN
WHITE
YELLOW
GRAY
ORANGE
PINK
PURPLE
=
=
=
=
GY
OR
PK
PR
BLACK
BLUE
BROWN
GREEN
=
=
=
=
BK
BL
BN
G
OPERATOR
Wiring Diagram - M9 Unit
45,000 - 260,000 Btu/hr Models
SPILL
SWITCH
ROLLOUT
SWITCH
BOX DEPICTS
OPTIONAL TEMS
TRANSFORMER
LOW WATER
CUTOFF
PLUG
JUNCTION BOX
DISCONNECT POWER BEFORE SERVICING
MANUAL
RESET
HIGH LIMIT
AUTO-RESET
HIGH LIMIT
PILOT
WHEN REPLACING WIRING, USE
WIRE OF EQUAL OR HIGHER
TEMPERATURE AND GAUGE
24VAC
RELAY
(GRAY)
CIRCULATION
PUMP
BYPASS PUMP
PUMP
DELAY
TANK
AQUASTAT
POWER SUPPLY
LBL20294 REV A
24VDC
RELAY
(BLACK)
GY
GAS
VALVE
BL
G
OUTDOOR
SENSOR
MAX SETPOINT °F
200
OFF
MIN SETPOINT °F
150
17
0
18
0
190
160
110 140
120 130
115
125
135
20
15
10
5
HIGH-FIRE
OFFSET °F
0
TST20036
CN2
PUMP
RELAY
INLET
PROBE
SYS/
TANK
CN9
CN1
LED1
CN12
TANK
AQUA-
STAT
FAULT
OUTDOOR
SENSOR
CN11CN10
W2
W3W1
G
W
PK BK
PK
BK
W
PK
W
Y
Y
Y
BK
BK
BK PK
BK
PK
BK
BL
LOW WATER CUTOFF
PR
4
3
2
1
AUTO
RESET
MANUAL
RESET
BK
W
G
Y
OR
OR
Y
PR
Y
BL
BL
BN
OR
OR
VENT
DAMPER
PLUG
POWER
VENTER
VENT
DAMPER
INLET
SENSOR
SYSTEM
SENSOR
POWER
VENTER
R
T
W
Y
= =
= =
RED
TAN WHITE
YELLOW
GRAY ORANGE PINK
PURPLE
=
= =
=
GY
OR
PK
PR
BLACK BLUE BROWN
GREEN
=
= =
=
BK
BL
BN
G
T
C
12
Y
PR
R
BN
R
W
W
W
W
BK
OR
OR
PK
PR
PR
PR
Y
Y
BN
BN
BL
T
Y
BL
R
W
OR
LOW
FIRE
HIGH
FIRE
R OR
W
T
PR
PRBL R Y BK
BK
GY
Y
Y
BK
BK
BL
W
R
FLOW
SWITCH
NOC
R1
W1
X
B
GY G
SPARK
BURNER GND
24V
GND
MV/PV
PV
MV
IGNITION
MODULE
P
Y
BK
W
PR
PR
4
3
2
1
YOR BK
BN
YOR BK
BN
21P1
P2 A
Y
OR
BK
BN
T
W
R
HIGH FIRE
OR
TST20036-1
TST20036-2
PR YBN
BL
T
Y
R
W
C
MV
PV
HI
R
R
54321
YBKBNBN OR
BL PR
Y GYPR
V
P
C
BL
W
R
BL
T
Y
R
W
W2R2
9 Diagrams