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77
Ladder Diagram
1,500,000 - 1,300,000 - 2,000,000 Btu/hr Models
J
3
5
4
6
1
2
3
O
.
C
.
J1
J
2
3
2
1
J
4
P
RES
E
T
R
E
SE
T
C
HA
S
S
I
S
G
R
O
UN
D
G
N
D
P
U
G
PU
BL
Y
24
V
A
C
LW
C
O
PROB
E
T
~
~
~
~
~
~
~
~
~
~
~
~
O
A SENSOR
INLET SENSO
R
REAR
CO
M
M
UNICATION
CABLE CONN
E
C
T
ION
CO
N
T
RO
L
PANEL
COMMUNICATIO
N
CABLE
C
O
NNECTION
B
YP
AS
S
VA
LVE
NO
CO
M
L
OUVE
R
REL
AY
CO
NT
ACT
S
R
STD.
VFD POWER
RELAY
NO
COM
NO
C
POWER
SWITCH
N
R
3
2
7
VFD
M
BLOWER
ASSEMBLY
S1
L1
L2
S2
120VAC GA
S VALVE
NO
COM
NO
COM
EXT. GAS VALVE
VENT VALVE
OPTIONAL
24 VA
C
LOW VOLTA
GE
TR
A
N
SFOR
MER
120
VAC
B
a
c
k
S
e
l
e
c
t
C
O
MMAN
D D
ISP
LAY
EBUS
EBU
S
EARTH
2
4
V
A
C
24
V
A
C
NC
CO
M
NC
HI-LIM
I
T ALARM
RELAY
CO
M
OVER
T
EMP
INDI
CAT
OR
R
24VAC SOLENOID V
ALVE
F
2
F
1
-
+
IG
N
ITIO
N
MO
DULE
11
10
9
6
4
3
2
1
N/A
T
H
P
I
L
V1
P
S
F
F
M/S
F
F
L
V2
RESET
8
7
5
M
V
IG
N
ITIO
N
R
ES
ET
OPTI
O
NA
L
Louver
P
r
o
v
in
g
Sw
Lo
w
Gas
Hig
h
Gas
Blocked
Drain
NO
NC
C
NO
NC
C
NC
NO
C
N
O
NC
C
NO
NC
C
NO
NC
C
O
PTIONAL
IGNITION
MODULE
N
O
CO
M
R
HOT
SURFACE
IGNITER
V
F
D
ENABLE
J3
51
41
31
21
4
3
2
1
E
G
ND
GN
D
A1-
3
O
HM
G
ND
G
N
D
22
V
DC
O
UT
E
-
B
U
S
DI
-
4
GND
DI
-
3
DI
-
2G
ND
2
O
U
T
3
OUT
5
OUT
1
OUT
4
O
UT
6
OUT
7
OUT
E
-
B
U
S
J
AC
K
A1-
1
O
HM
A1
-
2
OHM
A1-
4
OHM
A1 -
5
V
/
m
a
A1-
6
V
/
m
a
DI
-
1
2
4
VAC
2
4
VAC
COM
8
O
UT
L
E
D
Inl
e
t
W
a
t
e
r
S
e
n
s
o
r
By
p
a
ss
W
a
ter
S
e
n
s
o
r
S
/
S
OA
S
e
n
s
o
r
L
o
wAi
r/Bloc
k
D
rain
Hi
-L
o
Ga
s
/
L
ouve
r
Ou
tl
e
t
W
a
ter S
e
n
s
o
r
F
l
a
m
e F
a
il
u
re
L
o
w W
tr
F
l
o
w
Ga
s
V
a
l
v
e
HS
I
1
2
3
1
2
1
2
1
2
1
2
3
4
5
BYP
A
SS
SENS
O
R
O
U
T
L
E
T
SENS
O
R
I
N
L
E
T
S
E
N
S
O
R
E
N
AB
L
E
S
WI
T
C
H
O
A
SENS
O
R
2
1
CH
ASS
I
S
GROUND
RU
N/ST
O
P S
WITCH
24
VAC
HSI
1
2
2
3
4
5
6
7
8
9
1
1
2
3
6
5
78
9
10
11
31
30 29
28
26
2
7
25 24
23 22
21
20 19
1
8
17
16
BYPASS SENSOR
CO
MMUNICAT
IO
N
CABLE #
2
BK
BK
P
W
M
/
4
-
2
0
ma
Di
a
l
Al
a
rm
F
l
o
a
t
Cl
o
s
e
F
l
o
a
t
Op
e
n
I
gn
i
tion
E
n
a
b
l
e
n
/a
P
u
m
p
Relay
n
/a
CONTROLL
E
R
I
N
P
UT
S
I
NPUTS
1
1
1
1
1
1
23
G
O
UTLET
SENSO
R
OUT
P
UT
S
1
1
2
NO
COM
P
UM
P
REL
AY
PUMP MOTOR
PUMP POWER
120VAC 15AMP
NO
C
O
M
NO
AL
A
RM
RELAY
CO
M
AL
ARM
CONTAC
T
S
AL
ARM
24VAC OUT
AL
ARM
INDICAT
OR
SILE
N
CE
SWITCH
R
STD
.
STD
.
M
O
D
E
TI
M
E
BA
S
E
M
U
X
A
DD
R
MANUA
L
OVER-
RI
DE
SIG IN -
SIG IN +
24V Pwr
Com
mA Out
Volts Out
V
o
l
t
s
O
u
t
m
A
O
u
t
C
o
m
2
4
V
P
w
r
S
I
G
+
S
I
G
-
PWM
CONV
.
D
I
P SWITCH #5 ON
N
O
TIC
E:
F
AC
T
ORY
CALI
BRA
T
E
D
.
D
O NOT
AD
J
US
T.
T3
T2
T1
I
G
NITI
O
N REL
A
Y
HI-L
IM
IT
UNIT POWER 120VAC 15AMP
CO
MMUN
I
CA
T
IO
N
CABLE #
1
2
G
A
S VALVE RELAY
A
IR
SWITCH
FL
OW
SW
I
TCH
CONTROLLER HSI
12
GROUN
D
CO
N
T
RO
LL
ER 2
4
VAC
12
1
2
3
CONTROLLE
R
INP
U
T
S
1
2
3
4
5
1
2
3
4
5
CO
N
T
RO
LL
ER
I
NPU
T
S
2
3
4
5
6
7
8
9
1
R
CONT
R
O
L
L
E
R
OUT
P
UT
S
L
OUVER RE
L
AY
CONTROLLER
VF
D
1
2
3
HOT
NEUTRAL
GROUND
GROUND
2
G
R
O
U
ND
1
13
3
G
L1
L2
GND
R
L
V
1
LV2
P
U
M
P
E
N
AB
L
E
GAS
ON
F
L
OW
F
L
AME
F
AI
L
URE
O
PTIONA
L
B
L
K
DRAI
N
L
O
A
I
R
L
O
U
VER
G
A
S
H
I
/
L
O
LBL20021
REV B
88
88
P
R
O
G
V
O
L
T
S
A
MP
S
H
E
R
T
Z
RU
N
F
WD
REV
L
1L2
T
1T
2T
3
S
N
K
S
R
C
0
1
0
2
1
4
1
1
D
I
P
S
W
I
TC
H
I
N
D
O
W
N
P
O
S
I
TI
O
N
1
5
WARNING:
To avoid possible shock hazard, disconnect power before servicing.
TES
T
S
W
I
TC
H
P
U
T
T
2
4
VAC
L
W
CO
O
O
/
B
K
M
O
P
TI
O
N
A
L:
50
Hz
Li
m
i
t
R
esi
st
or
1.
2K
O
hm
O
VERRIDE TOGGLE
SWITCH
TO PUM
P
RELAY
CO
IL
T
O
O
VERRIDE
TOGGLE
SWI
TCH