Connecting The Lwco Device - Bosch Greenstar combi 100 p Installation And Service Instructions For Contractors

7.4

Connecting the LWCO device

NOTICE:
System damage or malfunction!
▶ Ensure the air box remains air-tight when routing the LWCO cable to
the outside.
▶ Do not route the LWCO cable through the ignition cable grommet as
appliance malfunction may occur.
▶ Punch a hole (maximum diameter 3/16" (5 mm)) through the fan
cable grommet (steps 13) and run the LWCO cable through it.
Fig. 44 Punch a hole in fan cable grommet for LWCO cable
▶ Install a 24VAC 20 VA transformer near the boiler.
▶ Follow LWCO manufacturer's instructions.
▶ Connect the lead labeled BOILER GROUND (green) to pin 2 (center)
of the white plug in the junction box of the wall-mounted gas
condensing boiler.
▶ Connect the two leads labeled 24 V HOT (red) and 24 V COMMON
(white) to the external 24 VAC transformer.
Greenstar combi 100 p / 151 p
Ø ≤ 3/16"
(~ 5 mm)
1
2
3
6 720 641 933-87.1O
▶ Connect the leads labeled SWITCH CONTACT (yellow) to the TB1
temperature switch ( Fig. 39, page 33) on the Heatronic.
1
Fig. 45 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] 24 V HOT (red)
[6] 24 V COMMON (white)
Electrical connection | 35
2
3
4
5
6
6 720 641 933-67.1O
6720872361 (2017/04)