Radio Thermostat CT101 Installation Guide

PG 1Install Guide 3M-50Caution • Your thermostat is a precise instrument, handle it with care.• Turn off electricity to the HVAC system before insta

PG 10PG 10HVAC Setup on Screen IMPORTANT: Make sure the 3M-50 is powered up and the mode is set to OFF. HVAC selection switches must be set rst [pg

PG 10PG 10PG 11Test Installation Follow these procedures to verify you have correctly installed the 3M-50.TO CHECK FAN (If you connected the G wi

PG 12PG 12Congratulations, you have successfully installed your unit. Please proceed to the OPERATING Guide to initialize the 3M-50. IMPORTANT: After

PG 12PG 12PG 13Step-by-Step Wiring Diagrams WIRES 2 Wire Heat GAS MILLIVOLT or 24VAC systemSTEP 1 - Connect the R (or RH) wire to the RH terminal

PG 14PG 14 W Y RH G WIRES 4 Wire Heat/Cool STEP 1 - Connect the W wire to the W terminal. This connects the heat.STEP 2 - Connect the Y wir

PG 14PG 14PG 15 4 Wire Heat Pump (heat/cool) without Auxiliary HeatSTEP 1 - Connect O wire to the O terminal or B wire to the B. This connects the c

PG 16PG 16 2 Stage Heat and 2 Stage CoolSTEP 1 - Connect the W wire to the W terminal. This connects the 1st Stage of HEAT.STEP 2 - Connect the W2 wi

PG 16PG 16PG 17Wire Reference Chart Possible Wires What They ControlR or V or VR RH and RC Single power for HEAT and COOLRH or 4 RH Powe

PG 18PG 18Lennox Heat Pump V or VR or R RH Power for HEAT M or Y Y COOL controlY or W or W2 W2 2nd stage HEATF or G G Fan control

PG 2PG 2TOOLS You will need a small Phillips screwdriver and a drill with 3/16-in. (4.8mm) bit for wall mounts. LOCATION Replacement installations -

PG 2PG 2PG 3REMOVE OLD UNIT Switch OFF electricity to the HEATING and COOLING systems. Then follow these steps:• Remove cover from old thermostat. M

PG 4PG 4What wires do you have? Make sure your wires are labeled. This may require you to nd the ‘other end’ connection for each wire on your heating

PG 4PG 4PG 5Find the step-by-step diagram for your system • Select the referenece page with your wiring diagram and set-up information below.• The C-

PG 6PG 6• “Fan out” wires as illustrated with 3M-50 below the wall opening. As in the example: fan out the wires so that the C wire is above the C te

PG 6PG 6PG 7Mount the 3M-50 to Wall 1. Hold the 3M-50 against the wall, with the wires coming over the top; above terminal block. The 3M-50 will cov

PG 8PG 8HVAC Selection • Set the HVAC TYPE switch in the NORM position if you have conventional natural gas, propane, oil, or electric heat. If you

PG 8PG 8PG 9Caution Special Battery WarningAlways replace the batteries as soon as the “Low Batt” ashes. The thermostat is a battery powered device.