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78
Wiring Diagram
1,500,000 - 1,300,000 - 2,000,000 Btu/hr Models
888
8
P
R
O
G
V
OL
T
S
A
MP
S
HE
RT
Z
RUN
F
W
D
RE
V
VFD
ENABLE
J3
E
G
ND
GND
A1-
3
O
H
M
G
ND G
N
D
2
2VD
C
O
U
T
E
-
BUS
D
I
-
4
G
N
DDI
-
3
D
I
-
2
GND
2
OU
T
3
O
U
T
5
O
U
T
1
O
U
T
4
O
U
T
6
O
UT
7
O
U
T
E
-
B
U
S
JA
C
K
A
1-
1
O
H
M
A
1-
2
O
H
M
A
1
-
4
O
H
M
A
1-
5
V/
m
a
A
1-
6
V/
m
a
D
I
-
1
24
VA
C
2
4
VA
C
C
O
M
8
O
U
T
LE
D
I
nlet Wa
te
r Sen
s
or
Bypass
Wa
te
r Se
nsor
S/S
OA Se
n
s
or
LowAir
/Block Dra
in
Hi-LoG
a
s/
Louver
Outl
e
t W
a
te
r
Se
nsor
F
l
a
m
e
Fail
ure
L
o
w
W
tr Flow
Gas Va
l
v
e
H
SI
2
4VAC
H
SI
1
2
2
3
4
56
7
8
9
1
12
3
GY
GY
BL
31 30
29 2
826
2
7
25
24 2
3
2
2
21 20 19
18 17 1
6
Back Select
H
I-LIMIT
NO
COM
NC
BL/
BK
CO
M
NC
Y
BL
NO
COM
NO
PU
HI-LIMIT ALARM
R
ELAY
ALARM
R
ELAY
COM
COM
NO
C
OM
PUM
P R
ELAY
120
VAC
CIRCUIT
BREAKER
OVER TEMP
INDICATOR
ALARM
C
O
NTACTS
ALARM
24
VAC
O
UT
A
L
AR
M
I
ND
ICATO
R
R
PU
PU
BL
BL
/
BKB
L/BK
BL
PUMP MOTOR
M
M
O
D
E
T
I
M
E
BAS
E
M
U
X
A
DD
R
MANUA
L
OVE R-
RIDE
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
24V
P
w
r
S
I
G
+
S
I
G
-
PWM
CO
NV.
COMMAND DISPLAY
24 VAC
VFD POWER RELAY
NO
COM
G
W
BK
BK
G
W
P
NO
C
POWER SWITCH
N
Y
T
Y
EBUS
EBUS
EARTH
24VAC
24VAC
G
Y
BL
W
G
BK
BK
BK
W
BK/W
BK
BK/W
BK
B
K
B
K
B
L
T
P
U
O
G
Y
PU
Y
BL
PU
PU
B
L/W
Y
Y
BL/W
BL
/
W
O
O
B
L
BR
W
G
Y
PWM/4
-20m
a
Di
a
l
Al
a
rm
F
loa
t
Clos
e
Fl
oa
t
O
p
e
n
Ignition
Ena
b
le
n/
a
Pump R
e
la
y
n
/a
CONTROLLER
CHA
SSIS
G
ROUN
D
Y
W
SILENCE
W
BK
Y
BL
BL
LOW VOLTAGE
TRANSFORMER
BL/BK
120VAC
15AMP
120VAC
15AMP
TWO 15 AMP CIRCUITS
OR ONE 30 AMP CIRCUIT
UNIT POWER
P
UM
P
P
OWER
CHASSIS
GROUND
CHA
SSIS
G
ROUN
D
IGNI
TION RELAY
FLOAT
R
R
R
R
BYPASS COMMO
N
R
S
T
D
.
S
T
D
.
B
L
R
B
L/W
BL
BL
B
L
1
4
5
6
2
3
REAR WIR
I
N
G
CONN
E
CTION
S
3
2
1
3
2
1
4
5
LO
U
V
24VAC ALARM
OUT
BYPASS
VALVE
OP
TI
O
NAL
2
1
A
LARM
C
O
NTACTS
PU
B
K
BL
Y
O
PE
N
CO
MMO
N
CL
OSE
B
R
T
PU
PU
Y
BL/W
OA
SENSOR
G
INPUTS
1
D
IP SWITCH #5 ON
P
UMP
BL
BL
P
Y
1
2
3
NOTICE:
FACTO
R
Y
CALIBR
AT
ED .
DO NO
T
ADJ
U
ST.
SWITC
H
BR
BK
W
BL
GY
GY
3
2
7
A
L
AR
M
DR
IVE
1
1
1
1
O
UTPUTS
W
FLOAT CLOSE
W/BK
1
2
BK
BK
3
2
1
L
1L2T
1
T
2
T
3
S
N
K
S
R
C
LI
NE
N
E
UT
RAL
G
R
O
UN
D
0
1
0
2
1
4
1
1
B
K
W
G
G
N
D
D
I
P
S
WI
T
CH I
N
D
O
WN
P
O
SITI
O
N
T
3
T
2
T
1
1
5
Y
PK
P
G
Y
W
G
Y
T
O
FAN
G
W
B
K
J3
5
4
6
1
2
3
O.C.
J
1
J
2
3
2
1
J
4
P
R
ESE
T
R
ESET
CHA
S
S
I
S
G
R
O
U
N
D
O
G
N
D
PU
G
PU
TEST
SWITCH
LW
C
O
PR
O
B
E
T
~
~
~
~
~
~
~
~
~
~
~
~
O/
T
T
P
Y
TO
1.
2K
R
ES
I
S
TO
R
TO
M
ANUA
L
O
’
R
I
D
E
SW