DEXA HR Wall Control Switch

The Elta DEXA HR Wall Control Switch (ET-900002/A) is the optional hard wired control for DEXA HR 100 and DEXA HR 150 single room heat recovery units. It gives the occupant three speed settings and a heat recovery or free cooling selector.Free cooling stops the alternating push and pull flow and holds the unit in extract only or intake only, so warm summer air is not heated back into the room. When two units are wired to the same switch they always run in sync, one supplying while the other extracts. DEXA HR wall control 3 speeds and free cooling Single back box What it is best used forHomes, flats and social or rented housing fitted with pairs of DEXA HR units in living rooms and bedrooms, where the occupant needs simple control of speed and summer free cooling. It is also the neat way to keep a pair of units synchronised without re-syncing them at the fuse board.It only suits DEXA HR units. Without it a DEXA HR runs at a fixed speed set by the wiring, and it is not a controller for whole house MVHR, which comes with its own controller.Why choose this over alternativesElta set the DEXA HR to run continuously, and recommend switching to extract only or intake only in mild weather rather than turning the unit off. This switch makes that a one touch change for the occupant, and the LED on the unit cover shows when free cooling is active.Boost can still be added through a dedicated switch or a humidity, CO2 or PIR sensor alongside the control switch.Installation notes Fit on a standard single back box and wire to the S1, S2 and S3 terminals of the DEXA HR as shown in the DEXA HR installation guide (fig. 18D for one unit, 18G for two). Units controlled by the same switch always operate synchronised. Set the integral jumper in each unit to A (extract) or B (intake) to choose the free cooling direction. Isolate the supply before wiring, and fit an omnipolar isolator with at least 3mm contact separation. Wiring by a qualified electrician. Browse more single room heat recovery units or Elta controllers, or call us for help choosing the right product.Specifications Model DEXA HR Control Switch Brand Elta Elta code ET-900002/A Fits DEXA HR 100 and DEXA HR 150 Functions Off, speed 1, 2 and 3, heat recovery or free cooling Units per switch One, or a synchronised pair Mounting Single back box Warranty 1 Year parts only Free cooling direction Set by jumper in each unit: A extract only, B intake only Wiring Terminals S1, S2 and S3 on the DEXA HR Manuals & Guides Elta DEXA HR Installation Guide