Cisco 3905 User Manual - Page 6

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6 • UK

2.3 EFC21 standard installation

Description

The diagram shows how a separate solenoid valve (SMG) must be connected to the EFC21. The

solenoid valve is part of the separate fail-safe system and will cut off the gas supply in the case of

insufficient system chimney draught (controlled by the fan pressure switch).

• Connect the earths of the mains supply, chimney fan and solenoidvalve

together (SMG).

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

• Connect the SMG to terminals 6–7.

• 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. 6

Unit

Fig. 7

Chimney fan with pressure switch (PDS)

Isolation switch

EFC21

SMG (solenoid valve)

3001736-EFC21-EFC25-UK

Mains

Gas