Honeywell RTH8500 Series Programmable Thermostat Guide

Honeywell RTH8500 Series Programmable Thermostat

Installation

1. Separate the wallplate from the thermostat.
2. Mount the wallplate as shown below.
3. Drill 3/16″ holes for drywall. Drill 7/32″ holes for plaster.

Wiring

Terminal Designations

• C: Common wire from the secondary side of the cooling transformer (if 2 transformers).
• K: Optional C-wire adaptor.
• Rc: Cooling power. Connect to the secondary side of the cooling system transformer.
• R: Heating power. Connect to the secondary side of the heating system transformer.
• W-O/B: 1st stage heat relay. Or a changeover valve for heat pumps.
• Y: 1st stage compressor contactor.
• G: Fan relay.
• W2-Aux/E: 2nd stage heat relay. Or heat pump auxiliary/Emergency heat relay.
• Y2: 2nd stage compressor contactor.
• L: Heat pump system monitor. Y2 G Y L W2 MCR34825Jumper Loop, a plug with a wire loop used to connect the R to the Rc terminals. Leave the jumper loop in place in single transformer systems. Remove (unplug) the jumper loop in the two transformer systems.

Wiring guide — Conventional systems

1. For the Honeywell TH9320WF thermostat installation, this thermostat requires a 24VAC common to power the unit. The K terminal is available for a C-wire adaptor (THP9045A1098).
2. Straighten the wire. Using a pen tip to hold down the terminal, gently slide the wire into the terminal hole.

If you’re looking for another Wi-Fi-enabled model with similar touchscreen controls, check the Honeywell RTH9585WF Touchscreen Thermostat User Guide.

1H/1C System (1 transformer)

• Rc Power [1]
• R [R+Rc joined by jumper loop]
• Y Compressor contactor
• C 24VAC common
• W Heat relay
• G Fan relay

Heat-only System

• Rc Power [1]
• R [R+Rc joined by jumper loop]
• C 24VAC common
• W Heat relay

1H/1C System (2 transformers)

• Rc Power (cooling transformer) [1, 2]
• R Power (heating transformer) [1, 2]
• Y Compressor contactor
• C 24VAC common [3]
• W Heat relay
• G Fan relay

Heat-only System with Fan

• Rc Power [1]
• R [R+Rc joined by jumper loop]
• C 24VAC common
• W Heat relay
• G Fan relay

Cool-only System

• Rc Power [1]
• R [R+Rc joined by jumper loop]
• Y Compressor contactor
• C 24VAC common
• G Fan relay

2H/2C System (1 transformer)

• Rc Power [1]
• R [R+Rc joined by jumper loop]
• Y Compressor contactor (stage 1)
• C 24VAC common
• W Heat relay (stage 1)
• G Fan relay
• W2 Heat relay (stage 2)
• Y2 Compressor contactor (stage 2)

2H/2C System (2 transformers)

• Rc Power (cooling transformer) [1, 2]
• R Power (heating transformer) [1, 2]
• Y Compressor contactor (stage 1)
• C 24VAC common [3]
• W Heat relay (stage 1)
• G Fan relay
• W2 Heat relay (stage 2)
• Y2 Compressor contactor (stage 2)

Wire specifications

For Honeywell TH9320WF thermostat installation, use 18- to 22-gauge thermostat wire. Shielded cable is not required.

1. Power supply. Provide disconnect means and overload protection as required.
2. Remove jumper loop for 2-transformer systems.
3. The common connection must come from the cooling transformer.

Wiring guide — heat pump systems

1. This thermostat requires a 24VAC common to power the thermostat. The K terminal is available for
   C-wire adaptor (THP9045A1098).
2. Straighten the wire. Using a pen tip to hold down the terminal, gently slide the wire into the terminal hole.

1H/1C Heat Pump System

• Rc Power [1]
• R [R+Rc joined by jumper loop]
• Y Compressor contactor
• C 24VAC common
• O/B Changeover valve [7]
• G Fan relay\

2H/1C Heat Pump System

• Rc Power [1]
• R [R+Rc joined by jumper loop]
• Y Compressor contactor
• C 24VAC common
• O/B Changeover valve [2]
• G Fan relay
• Aux/E Auxiliary/Emergency heat relay
• L Heat pump system monitor

3H/2C Heat Pump System

• Rc Power [1]
• R [R+Rc joined by jumper loop]
• Y Compressor contactor (stage 1)
• C 24VAC common
• O/B Changeover valve [2]
• G Fan relay
• Aux/E Auxiliary/Emergency heat relay
• Y2 Compressor contactor (stage 2)
• L Heat pump system monitor

Wire specifications

Use 18- to 22-gauge thermostat wire. Shielded cable is not required.

1. Power supply. Provide disconnect means and overload protection as required.
2. In Setup, set the changeover valve to O or B.

For users who prefer a simpler programmable option without Wi-Fi, see the Honeywell RTH8500 Series Programmable Thermostat Guide.

Initial setup

After completing the Honeywell TH9320WF thermostat installation, upon initial power-up or after being reset to factory defaults, the initial thermostat options (language, location, and system type) must be set to define the heating/cooling system. Other options can be customized later. Follow the prompts on the screen to select appropriate options.

1. Touch the language you want the thermostat to display, then touch Next.
2. Select Home or Business installation, then touch Next.
3. Touch Next, or name the thermostat location—touch THERMOSTAT and follow the rest of the instructions.
4. Select what the thermostat will control and touch Next.
5. Select the system type and touch Next. The system type determines other selections for completing the initial setup.
6. Touch Next after making selections on each screen.
7. Touch Done on the last screen. The thermostat displays an option to connect to the Wi-Fi network.

If you need a thermostat with advanced smart sensors and remote control, explore the Honeywell T9 Smart Sensor Thermostat Guide.

System setup

From the home screen, touch Menu > System Setup to modify the initial system setup.

System Setup Options (MENU > System Setup)

• Languages
• English/Français/Español.
• Your system type
  Select Forced Air (default), Heat Pump, Hot Water, or Steam. Each option offers different choices on the following screens.
• Your forced air heating system type
  Select how your forced air system is powered: Gas/Oil (default) or Electric.
• The efficiency of your heating system
  Select Standard Efficiency Forced Air (default) or High Efficiency Forced Air.
• Your heating system type
  If you selected Hot Water or Steam on “Your system type,” select the specific heating system here.
• Number of cooling stages
  Select 1 Stage (default) or 2 Stages. If you are unsure, note which wires are connected: ‘Y’ wire only (1 stage) or ‘Y’ and ‘Y2’.
• Number of heating stages
  Select 1 Stage (default) or 2 Stages. If you are unsure, note which wires are connected: ‘W’ wire only (1 stage) or ‘W’ and ‘W2’.
• Your fan control
  Select whether your thermostat (default) or heating system controls the fan.
• Type of changeover valve
  If you selected Heat Pump on “Your system type,“ select whether it uses a cooling changeover valve (default) or a heating changeover valve.
• Number of heat pump compressor stages
  Select 1 Stage (default) or 2 Stages. If you are unsure, note which wires are connected: ‘Y’ wire only (1 stage) or ‘Y’ and ‘Y2’.
• Your backup heat
  No or Yes (default)

Connecting to the Wi-Fi network

After completing the Honeywell TH9320WF thermostat installation and initial setup, walk the homeowner through connecting to a Wi-Fi network. Or, refer the homeowner to the User’s Guide so they can connect the thermostat to a Wi-Fi network at a later time.

1. Connect to the Winetwork.org
   Touch Yes to connect the thermostat to the Wi-Fi network during the Honeywell TH9320WF thermostat installation process. The screen displays the message “Searching for wireless networks. Please wait…” after which it displays a list of all Wi-Fi networks it can find.
   

Select the Network

1. 2a Touch the name of the homeowner’s network. The thermostat displays a password page.

• 2b Using the keyboard, touch the characters that spell out the home network password.

• 2c Touch Done. The thermostat displays “Connecting to your network. Please wait…” then shows a “Connection Successful” screen.
• 2d Touch Next to display the registration information screen.
• 2e Have the homeowner register the thermostat by going to https://www.mytotalconnectcomfort. com
  Note the Thermostat MAC and CRC; they’ll be needed during registration. Or, refer the homeowner to the User’s Guide.
• Touch MENU. The thermostat displays a list of options.
• Select Preferences > Advanced Preferences. The thermostat displays the first screen of options that you can change.
• On each screen, make changes as needed, then touch Next to display new options. Repeat this step until you have made all changes.
• When you have made all changes, press Done to save and exit.

Scheduling Options

Select Non-programmable or Programmable. Programmable uses default or customized programming to automatically raise and lower temperature settings for different times of day.

• Temperature Indication
  Scale Select Fahrenheit or Celsius.
• Heating and Cooling
  System Changeover: Select Manual or Automatic.
• Number ofSchedulese
  Perio: ds Select 2 Periods Per Day or 4 Periods Per Day.
• Pre-occupancy Purge Duration
  Select how long the fan will run before each occupied period: Off, 1, 2, or 3 hours.
• Type of Override
  Select Standard to maintain the programmed periods or Initiate Occupancy to use energy-saving settings until a user presses Start Occupancy.
• Override Duration
  Select how long to maintain the Honeywell TH9320WF temperature during an override: 1-10 hours or No Limit.
• Early Recovery for Heating
  Select No to begin recovery on schedule or Yes to ramp up temperature early.
• Early Recovery for Cooling
  Select No to begin recovery on schedule or Yes to ramp down temperature early.
• Temperature Limits
  Select the Minimum Cool and Maximum Heat Limit.
• Keypad Lockout
  Select Unlocked/Partially Locked/Locked.
• Clock Format
  Select 12-hour or 24-hour.
• Daylight Saving Time
  Select Off or On. If set to On, the system will automatically change the time/date to account for daylight saving.
• Indoor Display Offsets
  Select the number of degrees to offset the indoor temperature or the percentage to offset the indoor humidity.

Troubleshooting

If you have difficulty with your Honeywell TH9320WF thermostat installation or operation, please try the following suggestions. Most problems can be corrected quickly and easily.

• Check the circuit breaker and reset if necessary.
• Make sure the power switch on the heating and cooling system is on.
• Make sure the furnace door is closed securely.
• Make sure the C wire is connected.
• Check that the System Setup Honeywell TH9320WF screen “Your thermostat controls” or “Your system type” is set to match your heating and cooling equipment.
• Check that the System Setup screen “Your fan control” is set to match your heating equipment.
• The compressor protection feature is engaged. Wait 5 minutes for the system to restart safely, without damage to the compressor.
• Check your settings for the correct system setup. See “Type of changeover valve” on page 7.
• Touch the SYSTEM to set the system to Heat. Make sure the temperature is set higher than the Inside temperature.
• Touch the SYSTEM to set the system to Cool. Make sure the temperature is set lower than the Inside temperature.
• Check the circuit breaker and reset if necessary.
• Make sure the power switch on the heating and cooling system is on.
• Make sure the furnace door is closed securely.
• If “Wait” is displayed, the compressor protection timer is on. Wait 5 minutes for the system to restart safely, without damaging the compressor.
• Check that the System Setup screen “Your thermostat controls” or “Your system type” is set to match your heating and cooling equipment.

Specifications

Temperature Ranges

• Heat: 40° to 90°F (4.5° to 32°C)
• Cool: 50° to 99°F (10° to 37°C)

Operating Ambient Temperature

• 32° to 120°F (0° to 48.9°C)

Shipping Temperature

• -20° to 120°F (-28.9° to 48.9°C)

Operating Relative Humidity

• 5% to 90% (non-condensing)

Physical Dimensions

• 4-1/2″ W x 3-1/2″ H x 7/8” D
• (115 mm W x 88 mm H x 22 mm D)

Electrical Ratings

Regulatory information

FCC REGULATIONS 47 CFR § 15.19 (a)(3)

This device complies with part 15 of the FCC Rules. Operations are subject to the following two conditions:

1. This device may not cause harmful interference.
2. This device must accept any interference received, including interference that may cause undesired operation.

47 CFR § 15.21 (USA only)

Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.

47 CFR § 15.105 (b)

• See https://customer.resideo.com/en-US/
• support/residential/codes-and-standards/
• FCC15105/Pages/default.aspx for additional FCC information for this product. IC REGULATIONS RSS GEN
• This device contains licence-exempt transmitter(s)/receiver(s) that comply with Innovation, Science and Economic Development Canada’s Honeywell TH9320WF licence-exempt RSS(s).

Operation is subject to the following two conditions

1. This device may not cause interference.
2. This device must accept any interference, Honeywell TH9320WF including interference that may cause undesired operation of the device.
3. The operation of this equipment is subject to the following two conditions.
   • This equipment or device may not cause harmful interference.
   • This equipment or device must accept any interference, including interference that may cause undesired operation.

Another multi-stage programmable option worth checking is the Honeywell RTH7500 Series Thermostat Guide.

Customer Support

• Website:  resideo.com
• Tell: 1-800-633-3991.

2019 Resideo Technologies, Inc.

FAQs

Q: What type of thermostat is the Honeywell RTH8500?

Indeed. Small ice cubes can be crushed by the 600W motor, but for optimal performance and blade protection, it is advised to pulse the motor in brief spurts.

Q: Can it work with both heating and cooling systems?

Yes. The RTH8500 is compatible with forced air heating, cooling systems, and heat pumps. It can be configured for single-stage or multi-stage systems depending on your HVAC setup.

Q: How do I program the thermostat for different days?

Individual day programming or combining weekdays and weekends is possible with the thermostat. For accurate temperature management, you can program up to four time periods each day.

Q: Does the RTH8500 support manual operation?

Indeed. By temporarily changing the setpoint without affecting your saved schedule, manual mode allows you to override the programmed schedule whenever you like.

Q: How do I adjust the temperature setpoint?

To change the heating or cooling setpoint, use the up/down buttons or the touchscreen interface. Additionally, some models let you change the temperature right on the home screen.

Q: Can it help save energy?

Of course. You can cut down on energy use and utility costs by setting your thermostat to turn down the heating or cooling when no one is home or overnight.

Q: How do I switch between heating and cooling modes?

Choose between Heat, Cool, or Off by pressing the Mode button. Auto mode, which automatically alternates between heating and cooling according to your setpoints, is available on certain systems.

Q: Does it have a battery backup?

Indeed. In the event of a power loss, the RTH8500’s battery backup preserves settings. When the low-battery signal shows, make sure the batteries are installed and changed.