Page 9
Cascading the FT Series ‘Heating Only’ Boiler
R 0-1
0V W
(+) INPUT (-)
LWC
O/S
T/T
AC24V
OUTPUT
DHW
TEMP.
SENSOR
DHW
P
UM
P
N G
L N G
SYSTEM
P
UM
P
L N G
MAIN POWER
L/ZC
L-T/T
P
UM
P
N G
L/ZC
L-T/T
CASCADE
SYSTEM
SENSOR
Cascade System Sensor (18 Gauge Wire)
R 0-1
0V W
(+) INPUT (-)
LWC
O/S
T/T
AC24V
OUTPUT
DHW
TEMPERATURE
SENSOR
DHW
P
UM
P
N
G
L
N
G
SYSTEM
P
UM
P
L
N
G
MAIN POWER
L/ZC
L-T/T
P
UM
P
N
G
L/ZC
L-T/T
CASCADE
SYSTEM
SENSOR
Wiring Diagram for Cascaded
Reverse Return with Zone V
alves
Floor M
odel B
oiler 1 (L
ead)
Floor M
odel B
oiler 2 (F
ollo
w)
P1
P
O
W
ER
IN
T
T
ZO
NE
1
T
T
ZO
NE
2
T
T
ZO
NE
3
T
T
ZO
NE
4
OF
F
O
N
EN
D
S
W
.
MOD
E
Z
ON
E
V
A
LV
E
C
O
NT
R
O
L
FO
UR
ZO
N
E,
W
ITH
OP
T
ION
A
L
P
R
IO
R
IT
Y
NORMAL RE
S
E
T
TH
ER
M
OS
T
A
T
ZO
NE
1
1
2
3
4
1
ZONE 4 PR
IOR
IT
Y
2
3
4
ZO
NE
2
1
2
3
4
ZO
NE
3
1
2
TH
ER
M
OS
T
A
T
3
4
ZO
NE
4
JU
MPE
R
3
&
4
2
W
IRE ZO
N
E
V
AL
V
E
(
NO END S
W
ITC
H
)
3
W
IR
E
ZON
E
V
A
LV
E
(PO
W
ER
O
PE
N
4
W
IRE
ZON
E
V
A
LV
E
SEL
F CL
O
S
IN
G
)
1
2
3
M
O
TO
R
E
N
D
S
W
.
FUS
E (3
AMP
MAX
)
24
V
A
C
INPU
T
DR
Y
CONTACT
S
N/0 C N/C
P
O
W
E
R
TH
ER
M
OS
T
A
T
Outdoor
Sensor
(18 Gauge Wire)
Line
V
oltage T
erminals
Low
V
oltage T
erminals
POWER TO 24V
TRANSFORMER
(14 Gauge Wire)
Low
V
oltage T
erminals
(14 Gauge Wire)
Optional External
Low W
ater Cutof
f
(Factory Jumper Installed)
Line
V
oltage T
erminals
Low
V
oltage T
erminals
POWER TO 24V
TRANSFORMER
(14 Gauge Wire)
Low
V
oltage T
erminals
(14 Gauge Wire)
Optional External
Low W
ater Cutof
f
(Factory Jumper Installed)
Generic Zone V
alve Controller
NOTE: The terminal blocks ar
e NOT the same on
the floorstanding VS the wall-mounted models!
See Section 1.D on page 5
Figure 9.
Wiring diagram for cascaded reverse return with zone valves.
