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Radio Thermostat CT80 Install Manual

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Install Guide CT80
Caution
• The thermostat is a precise instrument, handle with care.
• Turn off electricity to the HVAC system before installing
or servicing thermostat or any part of the system.
• Do not turn electricity back on until work is completed.
• Do not short (jumper) across electric terminals at the
control on the furnace or air conditioner to test the
system. This may damage the thermostat.
• All wiring must conform to local codes and ordinances.
• This thermostat is designed for use with 24VAC and
millivolt systems (with a separate 24VAC power adapter).
• The thermostat relay load should be limited to 1.0 amp;
higher amperage may cause damage to the thermostat.
Caution
To avoid electrical shock and to prevent damage to the
furnace, air conditioner, and thermostat, disconnect the
power supply before beginning work. This can be done at
the circuit breaker, or at the HVAC system.
pn812-003-002 b2
top cover
Reset
button
Save
Energy
button
SAV E
ENER GY
Power Grid
status
HEA T
indicator
COO L
HVAC
FAN
statu
s
CHEC K
FILTE R
Filter
status
bottom
cover
RC-RH
Wire
Connect Switch
terminals
Increase
temp
button
Home
button
Mode
button
MENU
button
Lower
temp
button
Touch screen
ENGLISH
1
PG

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Summary of Contents for Radio Thermostat CT80

  • Page 1 Install Guide CT80 Caution top cover • The thermostat is a precise instrument, handle with care. • Turn off electricity to the HVAC system before installing RC-RH Reset Wire Connect Switch button terminals or servicing thermostat or any part of the system.
  • Page 2 You will need a small Phillips screwdriver and a drill with 3/16-in. (4.8mm) bit for wall mounts. LOCATION Replacement installations - mount the CT80 in place of the thermostat. You must have a “C” wire or other 24VAC power available at the CT80 location. A new location will require moving your wiring.

  • Page 3: Remove Old Unit

    REMOVE OLD UNIT Switch OFF electricity to the furnace and air conditioner; then follow these steps. • Remove cover from old thermostat. Most are snap-on types and simply pull off. Some have locking screws on the side or front. These must be loosened. DO NOT remove wires. Note the letters printed near the terminals.

  • Page 4: What Wires Do You Have

    Please follow these guidelines for safe and secure wire connections: • You will need at least 2.6” of wire for each of your connections to the CT80. • If you do not have enough wire, splice additional wire to allow enough slack.
  • Page 5 H V A C • The C-wire is required to operate Heat Heat/Cool Heat/Cool your CT80. If you do not have a C wire you will need to provide an alternate source of 24VAC power to the unit. Go To page...

  • Page 6: Connect Your Wires

    NOTE: If you wish you can mount the CT80 to the wall first, and then connect the wires. • The CT80 can be externally powered with a power source rated for 24V, AC or DC, at 300ma or greater. If used, connect to the C and RH terminals (no polarity).
  • Page 7 2. Position CT80 for best appearance. 3. Attach the CT80 to the wall with the screws provided. 4. If you are mounting the CT80 to sheet rock or if you are using the Wires old mounting holes, use the plastic anchors provided.

  • Page 8: Turn On Power

    With all the wires connected (including the C wire), it is time to turn the AC power back on. Do this at the breaker you used to switch it off. The CT80 will power-up in the control OFF mode. Your CT80 is not configured to operate your HVAC system yet. You must now use the menu driven HVAC SET-UP function.
  • Page 9 Is your heat GAS/OIL or ELECTRIC? Is your system multi-stage? 2 Stages 3 Stages Thank you, your thermostat is configured to control your HEATing. Configure COOL? How many stages of A/C do you have? 1 stage 2 stage Thank you, your thermostat is configured to control your COOLing.” If you have a HEAT PUMP system you will be asked these questions - “Is your heat pump multi-stage? 1 stage 2 stage Do you have auxiliary heat?

  • Page 10: Set-Up For Heat Pump Systems

    4. Select the appropriate number of stages for your heating system (from 1 to 3) by touching the number of STAGES (in brackets) to highlight, and using the +/- buttons to increase or decrease. 5. Touch the appropriate FAN CONTROL setting. Select HVAC if your heating system controls the fan (appropriate for most gas, oil, propane and similar furnaces).

  • Page 11: Check Hvac System

    5. If you have AUXILIARY heat, touch the number of stages (default is [NONE] ) use the +/- buttons to select 1-3 stages. (NOTE: The CT80 controls a maximum of 5 stages total between pump and AUX.) 6. (If you have AUX) Select the type of auxiliary heat that you have - Electric or Gas-Oil.
  • Page 12 OFF Congratulations, you have successfully installed your unit. Please proceed to the OPERATING Guide to initialize the CT80. IMPORTANT: After you have labeled and connected your wires, and followed the correct HVAC set-up, if these check procedures do not operate your system more info is available on our website at www.radiothermostat.com eatures or 877-602-5028.
  • Page 13 STATEMENT OF USE - This thermostat can be used with all 24VAC and millivolt (24VAC external power) heating and cooling systems. It cannot be used with line voltage systems. This thermostat is digital and your desired heat or cool temperatures can easily be set on the large touch screen with the +/- buttons.
  • Page 14 This connects the heat. STEP 3 - Connect the C wire to the C terminal. Your heater is now connected to the CT80. C H B O W W2 W3 Y Y2 RH RC G A DH EX Please Go To Page 6...
  • Page 15 STEP 4 - Connect the G wire to the G terminal on the thermostat. This connects the fan. STEP 5 - Connect the C wire to the C terminal. Your HVAC system is now connected to the CT80. Please Go To Page 6...
  • Page 16 Multi-stage Heat and Multi-stage Cool The CT80 can handle up to 3 stages of HEAT and 2 stages of COOL. HVAC SYSTEM STEP 1 - Connect the W, W2 and W3 wires to the W terminals. This POWER connects the stages of HEAT.

  • Page 17: Accessory Wiring

    Multi-stage Heat Pump with Multi-stage Aux Heat The CT80 can handle up to 2 stages of Pump compression and 3 stages of AUX heat. STEP 1 - Connect O wire to the O terminal or B wire to the B terminal. This connects the change-over valve.

  • Page 18: Fresh Air

    FOR EXTERNAL HUMIDIFIER or DEHUMIDIFIER USING Humidifier - HVAC SYSTEM's 24 To use the CT80 internal humidistat to control an external CT80 humidifier unit, connect it as shown. Connect the H H or DH terminal to the control leg of the humidifier relay. This allows H to turn the humidifier ON and Off.

  • Page 19: Wire Reference Table

    Wire Reference Table Possible Wires What They Control R or V or VR RH and RC Single power for HEAT and COOL RH or 4 RH Power for HEAT (RH not connected to RC with switch in UP position) RC Power for COOL (RH not connected to RC with switch in UP position) W Heat control - Normal 1st stage heat or heat pump aux 1st stage W2 Normal 2nd stage heat or heat pump aux 2nd stage W3 Normal 3rd stage heat or heat pump aux 3rd stage...
  • Page 20 Wire Ref Cont. Lennox Heat Pump V or VR or R RH Power for HEAT M or Y Y COOL control Y or W or W2 W2 2nd stage HEAT F or G G Fan control R or O X or X2 or C Trane Products [American Standard] C 24VAC power (to power thermostat) Emergency heat (do not connect, tape off)

  • Page 21: Appendix 1 : Multi-Staged Hvac Theory Of Operation

    APPENDIX 1 : Multi-staged HVAC theory of operation - Staging for 2 stage normal Cool and 2 stage heat pump Cool Target Temperature Maintenance in COOL - If the room temperature is within the target temperature plus the “2nd stg on at”...
  • Page 22 Staging for Heat Pump with 2 stages of compression (no auxiliary) Target Temperature Maintenance - If the room temperature is within the target temperature minus the “2nd stg on at” setting, the 1st stage heat pump will turn on. If the target temperature is not reached within 15 minutes, the 2nd stage of heat pump will turn on with the 1st stage to target.

  • Page 23: Appendix 2 : Fresh Air Install And Operation

    RH). The CT80 has two methods of providing Fresh Air - FAN FRESH AIR and MANUAL FRESH AIR. FAN FRESH AIR can be accessed from the HOME screen. Touch the FAN icon and choose FRESH. The fresh air baffle or air to air exchanger will activate every time the heat or cool comes on to add fresh air to your home.

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