CRKY 4 2 HVAC BEFORE Thermostat 1 Installation Guide resideo.com C WIRE ADAPTER Online Guides and Support OFF Turn the power off at the breaker box or control switch for your HVAC* system. Remove your old thermostat from the wall plate. *Heating, ventilation, and air conditioning Overview This product provides a C wire (common wire) to power a thermostat. Only install if you do not have a C wire available to connect to your thermostat. 5 Open HVAC system’s cover to reveal the control board. 6 Take a picture of the wires on the control board. Ensure the terminal labels and wires are in the image. You may need to reference the picture later. * O or B terminal may also be used. CONTINUE 7 Use the provided stickers to label the following connected wires: 8 Disconnect ONLY the wires that you just labelled: AFTER HVAC C Wire Adapter Thermostat C OFF ON Breaker boxSwitch Do not remove any wires at this time! ZONING CONTROL PANEL CHECK For zoned systems, install the C Wire Adapter between the thermostat and the zoning panel, NOT between the zoning panel and HVAC equipment. 3 Take a picture of the wiring. Ensure the terminal labels and wires are in the image. You may need to reference the picture later. Confirm that you do not have a wire in the C terminal. If you have a wire in the C terminal, then you do not need this product. Look for an unused wire. If you have an unused wire, then you do not need this product. Connect one end of that wire to C terminal at the HVAC and the other to C terminal at new thermostat. * The C wire (common) might be labeled as B rather than C on certain thermostats. Go to your HVAC system. It may be located in your attic, crawl space or basement. C terminal * EXAMPLE * C W or W1 Y or Y1 R or Rc G W2 ** CWW2GRKY Terminal Labels Wires G C R W W2 Y G R or Rc • • * ** EXAMPLE * C Y or Y1 R or Rc G W2 W or W1 W or W1 Y or Y1 • • * Not all systems will have a W or W1-wire. On a heat pump application, the wire coming from O/B on the old thermostat would match to either O or B at equipment rather than W. ** If multiple wires are connected to a terminal, only label the the wire running to your thermostat. G R or Rc • • W or W1 Y or Y1 • • * Do NOT disconnect wires that you did not label. ** If multiple wires are connected to a terminal, only remove the the wire running to your thermostat. *** On a heat pump application, the wire coming from O/B on the old thermostat would match to either O or B at equipment rather than W. *** 33-00342-0815 16 13 14 Before mounting, check to make sure surface is clean enough to ensure good adhesion. Mount C Wire Adapter inside the furnace using included mount and adhesive pad. 11Connect the wires from the “Equipment” labelled side of the C Wire Adapter to the matching terminals on the control board. * If there are separate wires to W and O, leave the W and O wires attached at HVAC and do not connect them to the C Wire Adapter. Label your now converted wires as shown. Close the HVAC system’s cover. Leave the power off. 12 CHECKPOINT Your C Wire Adapater should now be installed between your thermostat wiring and the control board. HVAC Control Board Thermostat C Wire Adapter Adhesive pad Mount GY K C G Y Wires C K Labels Label ALL of the remaining wires according to their terminals. * O/B terminal may also be used. GWRY K C EXAMPLE R W 17Confirm you have labelled ALL of your wiring. Disconnect the wires from the old wall plate. * O/B terminal may also be used. 18 9Insert the wires you just disconnected into the C Wire Adapter terminals. WCKR THERMOSTAT R Y G W or O/B G Y R Wires W or O/B C K R Terminals This will convert the G and Y-wires into C and K-wires. 10 Take a picture of the wires you inserted into the C Wire Adapter. Ensure the terminal labels and wires are in the image. You may need to reference the picture later. R R Y WCKR THERMOSTAT R Y G K C EXAMPLE R W Refer to your new thermostat’s installation guide for detailed instructions to complete the following tasks below. The wires you label C and K are the wires you inserted into the C and K-terminals in step . 9 NEXT STEPS C W, W1, O, or B * Y or Y1 R G W2 G C EXAMPLE Go back to your thermostat. A Remove the old wall plate and mount the new one. C Complete your new thermostat’s installation by attaching the thermostat to the wall plate, restoring the power, and configuring the thermostat. B Wire the new thermostat. EXAMPLE C R CW K R K W Refer to the labels you applied when inserting the wires. When done wiring, you should have wires in the C and K-terminals. You should not have wires in the Y or G-terminals. * * Resideo Technologies, Inc. 1985 Douglas Drive North, Golden Valley, MN 55422 1-800-468-1502 33-00342—08 M.S. Rev. 05-20 | Printed in United States © 2020 Resideo Technologies, Inc. All rights reserved. The Honeywell Home trademark is used under license from Honeywell International, Inc. This product is manufactured by Resideo Technologies, Inc. and its affiliates. www.resideo.comNext >