5Single-Piece Installation — For single-piece installa-tion, perform the following procedure.1. Turn off all power to equipment.2. If an existing thermostat is being replaced:a. Remove existing control from wall.b. Disconnect wires from existing thermostat, one at atime.c. As each wire is disconnected, record wire color andterminal marking.d. New or additional wires may be needed to accom-modate added humidity outputs.e. Discard or recycle old control.3. Remove cover from equipment control module by pressingthe two tabs on the bottom edge and pulling away.4. Route wires through large hole in equipment control mod-ule base. Level base against the wall (for aesthetic purposesonly, the equipment control module does not need to beleveled for proper operation) and mark wall through twomounting holes.5. Drill two 3/16-in. mounting holes in wall where marked.The equipment control module may be mounted on thejunction box, if desired. Make sure that the hole pattern onbase matches junction box mounting holes.6. During thermostat installation provide sufficient excesswiring behind the mounting plate. Coil the wiring creatinga service loop and place in mounting box or behind thewall to remove strain against the terminal strip. See Fig. 4on page 3.7. Secure base to wall with two screws and anchors provided.Additional mounting holes are available for more securemounting if needed. Make sure that all wires extendthrough hole in mounting base.8. Adjust length and routing of each wire to reach proper con-nector block and terminal on mounting base with extra1/4-in. wire.9. Connect equipment wiring to the terminals on the equip-ment control module, being careful not to over-tighten thescrews. See Fig. 10.10. Seal hole in wall to prevent air leaks. Leaks can affect oper-ation and cause incorrect temperature and/or humiditymeasurement.11. Connect red wire of the pigtail to V+ terminal on the equip-ment control board. Pigtail is packed loose in the box fromthe factory. Pigtail is attached to the back of the displaymodule via 2-pin, keyed connector. Connect black wire ofthe pigtail to Vg terminal on the equipment control board.Correct polarity must be observed when connecting. Ifwires are connected incorrectly, the display module willnot operate.NOTE: The 2-wire pigtail is not intended to support the weightof the user interface. Do not hang the display module from theequipment control module screw terminals.12. Attach 2-wire pigtail to display module.RELAYSOATRRSSRTNHUMD1D2V+VgRcRhW1GY2CO/W2/BY1CONNECTTO USERINTERFACEDRYCONTACTOAT/RRSRETURNJW6 TWISTOFFSEPARATERC/RH BYBLACK BREAKINGJW6 ONCONTROLMODULEBOARD.REDLEGENDOAT — Outdoor Air Temperature SensorRRS — Remote Room Temperature SensorFig. 10 — Control Module Connector Block Terminalsa33-9170Fig. 11 — Cover Installed on Equipment ControlModule