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Elecrical connection
TT
BUS
Out Sen
1
2
3
Fig. 54 Low voltage (LV) terminals (pre-wire links not shown for
simplicity)
[1]
BUS - BUS connection to programmer
[2]
TT - Thermostat/On demand signal (pre-wired link) (dry contact)
[3]
Out Sen - Outdoor temperature sensor (included with FW200
accessory)
[4]
LWCO - Low Water Cut Off switch (pre-wired link) (external 24V
power required)
[5]
DHW Sen - Domestic Hot Water tank temperature sensor
[6]
Empty (future connectivity)
7.1.8
DHW tank temperature sensor connection
Before connecting the DHW tank temperature sensor to the Low voltage
(LV) connections.
▶ Remove the pre fitted connector [1] from DHW tank
temperaturesensor lead [2].
▶ The DHW tank temperature sensor lead can now be wired to the
Lowvoltage (LV) connection "DHW "Sen position 5.
1
2
Fig. 55 DHW tank sensor connector plug removal
7.1.9
Connecting the LWCO device
▶ Install a 24VAC 20VA transformer near the boiler.
▶ Follow LWCO manufacturer's instructions.
▶ Connect the lead labelled BOILER GROUND (green) to pin 2 (center,
Fig. 51 [2]) of the white plug in the boiler junction box.
▶ Connect the leads labelled 24V HOT (red) and 24V COMMON (white)
to the external 24VAC transformer.
▶ At the Low Voltage box on the rear of the boiler, remove the link
across LWCO connections and connect the leads labeled SWITCH
CONTACT (yellow) to these connections.
50
LWCO
DHW Sen
4
5
6
6720810590-57.1Wo (2014/11)
2
6720811590-80.1Wo
1
Fig. 56 Wires of a LWCO device with LWCO adapter
[1]
LWCO device (Hydrolevel Safgard 1100)
[2]
BOILER GROUND (green)
[3]
SWITCH CONTACT (yellow
[4]
SWITCH CONTACT (yellow)
[5]
24V HOT (red)
[6]
24V COMMON (white)
Greenstar FS/Combi FS – 6 720 810 590 (2020/04)
2
3
4
5
6
6 720 641 933-67.1O
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