Fan control wiring

Chester X1’s fan relay is a dry contact. It does not provide power to the fan — it switches the coil of an external contactor that powers the fan motor.

Single-phase fan

[ Mains L ] ─┬───────────────────────[ Contactor coil A1 ]
             │
             └─[ Chester X1 relay COM / NO ]─[ Coil A2 ]─[ Mains N ]

Run a 14 AWG pair from the contactor coil terminals through the Chester X1 relay. The relay is rated 10 A @ 240 V AC, which is more than sufficient for any standard contactor coil.

Three-phase fan

The wiring is identical on the control side — Chester X1 still switches the contactor coil, not the three-phase motor leads. Use a contactor sized for the motor, with overload protection in line with the motor leads.

Manual override

There is no physical override switch on Chester X1. To override automation:

1. Flip the contactor’s local hand-off-auto switch to Hand, or
2. Set the fan to Manual: On in the dashboard.

The dashboard override is honored even if cell signal is later lost — Chester X1 caches the last command.