Hitachi SPX-WDC3 Dry Contact Cord for airHome
The genuine cord that connects an external dry contact, such as a key card or window switch, to an airHome indoor unit.
AirGreen codeAG-AC-051
514 316-2973 · sales@airgreen.ca
Quick facts
The SPX-WDC3 is the genuine Hitachi cord that connects an external, voltage-free dry contact to the CN6 connector on the airHome indoor unit’s board. The manufacturer’s technical guides present it for hotel key card readers and for window contacts.
Automatic shutoff based on occupancy
When the card is removed from the reader, or when the window opens, the contact changes state and the unit shuts off, about 10 seconds later according to Hitachi. With the card removed, the wireless remote can no longer control the unit; a wired remote lights up, but has no effect on the unit. This avoids heating or cooling an empty room or a room open to the outdoors.
Connection
- Dry contact side: non-polarized connection.
- Unit side: CN6 connector on the main board, set with the DSW1 switch.
- Two contact logics, type A or type B, depending on the device.
Applicable units
The airHome Multi guide lists the RAK-DJ(09-24)RHAA, RAK-DJ07QHAA, RAK-GJ(07-24)QHAA, RAF-FJ(07-18)QHAA, RAI-GJ(07-24)QHAA and RAD-GJ(07-24)QHAA. The spec sheets for the airHome 400, 600 and 800 wall units list it as well.
Installed by AirGreen across Greater Montréal
We connect the cord, set the contact logic and test the shutoff in Montréal, Laval, Longueuil, on the South Shore and on the North Shore. RBQ licence 5645-9605-01. For availability or a quote, call us at 514 316-2973 or email sales@airgreen.ca with the number of units and the device to connect.
Stop the unit when the room is empty or the window is open
Hitachi describes the SPX-WDC3 for linking the indoor unit to a key-card reader or a window switch.
- Hotel and residence rooms with key-card readers
- Window switch: the unit stops when the window is open
- airHome wall, console, ducted and mini-cassette units
- Any external voltage-free dry contact device
Specifications
From the manufacturer’s documentation. A value the manufacturer does not publish is not listed.
What to know before installing
- The cord plugs into the CN6 connector on the indoor unit board; setup is done with DIP switch DSW1.
- Choose the contact logic (type A or B) to suit the external device.
- Card removed: the wireless remote no longer runs the unit, and a wired controller lights up without control.
- The work is on the circuit board: have a technician do it.
Manufacturer documents
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Frequently asked questions
What does it do in a hotel?
Wired to the key-card reader, it keeps the unit from running when the card is removed from the room. The unit stops about 10 seconds after the contact opens.
And with a window switch?
Same idea: the unit stops when the window is open, and can be restarted once the contact closes.
Which units accept it?
Hitachi lists RAK-DJ and RAK-GJ wall units, RAF-FJ consoles, RAI-GJ mini-cassettes and RAD-GJ ducted units, plus airHome 400, 600 and 800 wall units.
Can you install it?
Yes. We connect the cord, set the contact logic and test the shutdown, everywhere in Greater Montréal.
An airHome that stops at the right time
Tell us the size and the quantity: we confirm availability and send you a quote. Or let our technicians install it for you.
Specifications from the manufacturer’s documentation, checked on October 7, 2026.