Page 5
Cascading the FT Series ‘Heating Only’ Boiler
R 0-10V W
(+) INPUT (-)
LWC
O/S
T/T
DHW
TEMP.
SENSOR
DHW PUMP
L N G
L N G
CH PUMP
CASCADE
SYSTEM
SENSOR
Line Voltage Terminals
Line Voltage Terminals
Low Voltage Terminals
High and Low Voltage Terminals, Floor VS Wall.
R 0-10V W
(+) INPUT (-)
LWC
O/S
T/T
AC24V
OUTPUT
DHW
TEMP.
SENSOR
DHW PUMP
N G
L N G
SYSTEM PUMP
L N G
MAIN POWER
L / Z C
L-T/T PUMP
N G
L / Z C
L-T/T
CASCADE
SYSTEM
SENSOR
Low Voltage Terminals
Low Voltage Terminals
The floor model FT has these additional ----------------- voltage connections / functionalities
The wall-mounted models do NOT have a built-in low loss header.
The boiler circulation pump circulates the CH water out the common
header up to 15’ of equivalent pipe at 1.5” diameter pipe.
Max Amp draw per pump = 1.6 Amps.
1.C.2
Wall-Mounted CH Circulation
1.D High Voltage and Low Voltage Terminals
Figure 2. Wall-Mounted CH circulation
Figure 3. Field Connections for WALL models
Figure 4. Field Connections for FLOOR models
CH Supply
Boiler
Circulation
Pump
CH Return
Combustion Air
Vent
GAS INPUT
CH Supply
CH Return
Gas Input
Combustion Air Vent
NOTE: The terminal blocks are NOT the same on the
floorstanding VS the wall-mounted models!
W A L L M O D E L S
F L O O R M O D E L S
