48 | Making the electrical connections
Greenstar FS
6 720 810 590 (2015/05)
7.3 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 temperature
sensor lead [2].
▶ The DHW tank temperature sensor lead can now be wired to the Low
voltage (LV) connection “DHW Sen” position 5.
Fig. 52 DHW tank sensor connector plug removal
7.4 Connecting the LWCO device
▶ Install a 24VAC 20VA transformer near the boiler.
▶ Follow LWCO manufacturer’s instructions.
▶ Connect the lead labeled BOILER GROUND (green) to pin 2 (center,
Fig. 48 [2]) of the white plug in the boiler junction box.
▶ Connect the leads labeled 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.
Fig. 53 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)
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