The FT Series Floor Standing, Combination Boiler
Page 45
NG NGLNG
O
DHW RECIRC
PUMP
(IF USED)
RECIRCULATION LOOP WIRING
L/ZC
DHW-R SENSOR
(Surface Strap-on Sensor)
(IF USED)
I
O/S
LINE VOLTAGE TERMINALS (14 Gauge Wire)
AC24V
OUTPUT
LWC
DHW
RECIRC.
SENSOR
R 0-10V W
(+) INPUT (-)
DHW RECIRC PUMP
SYSTEM PUMP
MAIN POWER
120 VAC
LESS THAN
12 AMPS.
LOW VOLTAGE TERMINALS (18 Gauge Wire)
H-T/T
T/T
(Factory Installed Jumper)
L
Wiring for DHW recirculation loop pump controlled by the FTCF boiler
1)
When using a DHW recirculation loop, install the DHW recirc sensor (Optional item: part no: FT3125) by
strapping it on the recirculation line close to the boiler and insulate the assembly. Use 18 gauge wire and
connect the DHW-R sensor to DHW recirc terminals.
2)
The operation of the DHW recirc pump is programmed as per the Installer menu, section 5.8.
3)
A dry contact aquastat can also be used for measuring the DHW recirc water temperature in lieu of the
optional DHW recirc sensor by installing the aquastat into a dry well (not provided). Refer to section 5.8
for proper programming.
4)
The FTCF boiler can also control a small recirc pump without DHW-R sensor or recirc aquastat. In this
case the boiler will control the recirc pump operation based on parameters 32 and 33 in section 5.8 and
cycle the recirc pump based on these parameter values.
Note:
This space is intentionally left blank.
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