20-40-60 Timer operates the ventilation unit in high-speed air exchange for the following durations: 20 minutes 40 minutes 60 minutes Wiring: Colour-coded, 3-conductor wire to the H/ERV’s terminal block. Up to three timers can be used with a single H/ERV, in addition to a main wall control (611229, 611230, 611227 or 611242-FC).
