Cisco 3905 Panduan Pengguna - Halaman 7

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3001736-EFC21-EFC25-UK

2.4 EFC21 installation with external ON/OFF

Description

Example showing how an external ON/OFF switch can be connected to a standard installation. Al-

lows the system to be switched ON/OFF by the external switch or by the controller.

• Connect the mains earth to the earth terminal of the chimney fan and to the solenoid valve

together(SMG).

• Connect the chimney fan and pressure switch to terminals 1–5.

• Connect the SMG to terminals 6–7.

• Connect the external ON/OFF switch (potential free) to terminals 8–9.

• Connect the optional Air inlet monitoring to terminals 10–11. If this monitoring is not manda-

tory then a jumper must be fitted across terminals 10–11.

• Connect mains supply to terminals marked "Supply".

Wiring diagram

Fig. 8

Unit

Fig. 9

Chimney fan with pressure switch (PDS)

Isolation switch

External ON / OFF

SMG (solenoid valve)

EFC21

Mains

Gas

UK 7