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65
Installation & Service Manual
10 Diagrams (continued)
Schematic Diagram - M9 Unit
315,000 - 399,999 Btu/hr Models
BO
X
D
EPI
C
T
S
O
PT
I
O
N
A
L
I
TE
M
S
120V
LINE
120
NEUTRALGROUND
24VDC RELAY
CIRCULATION
PUMP
MOT
120V
TRANSFORMER
24V
CN1-1 OPERATOR CN1-2
1 LOW WATER 2
CUTOFF
5 VENT DAMPER 3
RW
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
1
1
IGNITION
MODULE
24V
PV
MV
GAS VALVE
PV
MV
MV/
PILOT
LOW
HIGH
OPERATOR
CN2-1 CN2-2
PV
MV/
PV
IGNITION
MODULE
24V
GND
BURNER
GND
2
LOUVER RELAY
R
PILOT
SPARK
T
CN3
CN4
INLET SENSOR
CN5
CN6
SYSTEM SENSOR
R
24VDC RELAY
CN7
CN8
T
TIMER
TD
ARMING RELAY
R
OFF RELAY
R
OFF RELAY ARMING RELAY
FAILURE CONTACTS
6
7
12
345
CONTACTS ON ANY FAILURE
1C
CNO
315&360 ONLY
315&360 ONLY
W
W
BKPK
BK
BK
BK
W
BL Y
Y
Y
BL
BL
Y
Y
R
W
BL
W
PR
PR
PR
PR
PR
T
PR
PR
GY
GY
BL
R
R
W
G
Y
O
R
BK
BK
BL
BL
OR
OR
T
OR
W
BL
R
Y
PR
Y
Y
BL
G
BK=
BL
ACK
BL=
BL
UE
BN
-
BR
O
W
N
G
=
G
R
EEN
G
Y=
G
R
AY
O
R
=
O
R
AN
G
E
PK=
PI
NK
PR
=
PUR
PL
E
R
=
R
ED
T
-
TA
N
W
=
W
H
I
T
E
Y=
YELLO
W
R
BK
PR
PR
LBL20160 REV A
AUTO-RESE
T
HIGH LIMIT
HIGH FIRE
W2
R2
3
2
Y
BK
GY
V
P
VENTER
PROVING
R
VENTER RELAY
Wiring Diagram - M9 Unit
315,000 - 399,999 Btu/hr Models
MODULE
SPARK
IGNITION
BURNER GND
24V
GND
MV/PV
PV
MV
CIRCULATION
R1 W1
SPILL
ROLLOUT
X
B
NO
C
FLOW
SWITCH
INLET
SENSOR
SYSTEM
DIFFERENTIAL
240
SETPOINT
160
O
F
F
RELAY
PUMP
140
12
0
220
200
180
7
6
5
8
9
5
15
14
13
12
10
11
10
OFFSET
HIGH-FIRE
0
TANK
SYS/
SENSOR
INLET
20
1
5
BOX DEPICTS
OPTIONAL ITEMS
24VDC
Y
TRANSFORMER
BL
SENSOR
RELAY
A
P2
P1
1
2
1
2
3
4
OR
BN
BK
Y
T
W
LOW WATER
CUTOFF PLUG
5432
1
VENT DAMPER
BN OR BNBK Y
BL
R
PK
B
L
Y
W
P
R
PR
PR
PR
PR
PR
T
Y
BL
RW
T
PR
BL R Y
GY
GY
GY
GY
Y
G
R
W
BL
BL
BK
BK
BL
BL
OR
OR
OR
BK
BK
W
G
LOW WATER CUTOFF
W
BK
BK
BK
G
JUNCTION BOX
DISCONNECT POWER BEFORE SERVICING
SWITCH
MANUAL RESET
HIGH LIMIT
SWITCH
AUTO-RESET
HIGH LIMIT
PILOT
VENT
DAMPER
PLUG
WHEN REPLACING WIRING, US
E
WIRE OF EQUAL OR HIGHER
TEMPERATURE AND GAUGE.
OR
(BLACK)
PUMP
P
K
W
W
PUMP
21C
0.9
0.7
60
50
0.6
O.A. MAX.-°F
40
45
70
VR1
65
1.5
0.5
RATIO
VR2
1.1
1.3
1.0
W
1
W
2
W3
O.A. SHUTDOWN
SHUTDOWN-°F
50
40
45
70
55
VR3
60
55
65
O.A. SENSOR
DIS ABL E
SW1
0.8
ENABLE
ON
CN1
LOW
FIRE
HIGH
FIRE
OUTDOOR
SENSOR
OUTDOOR AIR RESET
P
O
R
21
3
BK
GY
Y
GY
LOUVER
RELAY
PLUG
LOUVER RE
LAY
43
2
1
5
CONTACT ON
ANY FAILURE
315&360 ONLY
R
Y
WPRT
MANUAL
RESET
1
2
3
4
BK
Y
OR
BN
AUTO
RESET
BK=BLACK
B
L=BLUE
BN=BROWN
G=GREEN
GY=GRAY
OR=ORANGE
PK=PINK
PR=PURPLE
R=RED
T=TAN
W=WHITE
Y=YELLOW
P
O
W
E
R
S
U
PP
L
Y
DELAY
LBL20159 REV A
C
MV
PV
HI
R2
W2
VP
VENTER
C
R