Robertshaw RS10420T Programmable WiFi Thermostat
Installation Manual
Introduction
The Robertshaw® Programmable WiFi Thermostat allows you to control the temperature anytime and anywhere. It features a large backlit display and LCD touchscreen for ease of operation. Compatible with any iOS or Android Smartphone.
Thermostat Application Guide
| Description | |
| Gas or Oil Heat | Yes |
| Electric Furnace | Yes |
| Heat Pump (No Aux. or Emergency Heat) | Yes |
| Heat Pump (With Aux. or Emergency Heat) | Yes |
| Multi-Stage Systems | Yes |
| Heat Only Systems | Yes |
| Cool Only Systems | Yes |
| Millivolt | Yes |
Power Type: Hardwire (Common Wire)
A trained, experienced technician must install this product. Carefully read these instructions. You could damage this product or cause a hazardous condition if you fail to follow these instructions.
Specifications
| Display range of temperature | 32°F to 99°F (0°C to 40°C) |
| Control range of temperature | 41°F to 90°F (5°C to 32°C) |
| Load rating | 1 amp per terminal, 1.5 amp maximum all terminals combined |
| Differential (cycle rate or swing) | Heating is adjustable from 0.2° to 2.0° Cooling is adjustable from 0.2° to 2.0° |
| Power source | 18 to 30 VAC, NEC Class II, 50/60 Hz for hardwire |
| Operating ambient temperature | 32°F to +105°F (0°C to +41°C) |
| Operating humidity | 90% non-condensing maximum |
| Dimensions of thermostat | 4.7"W x 4.4"H x 1"D |
Installation Tips
Subbase Installation
Mounting Options:
- Horizontal Mount
- Vertical Mount
Installation Diagram Description: The diagram shows the thermostat subbase with mounting points. For vertical mounting, use one screw at the top and one at the bottom. For horizontal mounting, use one screw on the left and one on the right.
Installation Tip: Electrical Hazard
Failure to disconnect the power before beginning to install this product can cause electrical shock or equipment damage.
Mercury Notice: All Robertshaw products are mercury-free. If the product you are replacing contains mercury, dispose of it properly according to your local waste management authority's instructions.
Mount Thermostat
Align the 4 tabs on the subbase with the corresponding slots on the back of the thermostat. Push gently until the thermostat snaps into place.
Thermostat Quick Reference
Getting to Know Your Thermostat
The thermostat display includes:
- Days of the week and time
- Current room temperature
- User selectable setpoint temperature
- Hold indicator: Displayed when the thermostat program is permanently overridden.
- System Operation Indicators: Indicates if the compressor delay is active (flashing).
- Programmable Time Periods: Residential systems use four periods: WAKE, RETURN, LEAVE, and SLEEP.
- Program Menu Options: Displays programming options.
Key Buttons:
- Fan Buttons
- Next Step Buttons
- Set Time Buttons
- Program Buttons
- Menu Buttons
- System Buttons
- Setpoint Buttons
Wiring
Caution: Electrical Hazard
Failure to disconnect the power before beginning to install this product can cause electrical shock or equipment damage.
Warning: All components of the control system and the thermostat installation must conform to Class II circuits per the NEC Code.
Wiring Steps
- If replacing a thermostat, note the terminal connections on the thermostat being replaced. Wiring may not be color-coded; for example, the green wire might not connect to the G terminal.
- Loosen the terminal block screws. Insert wires, then retighten the terminal block screws.
Installation Tip: Do not overtighten terminal block screws, as this can damage the terminal block. A damaged terminal block can prevent the thermostat from fitting correctly on the subbase or cause system operation issues. Maximum Torque: 6 in/lbs.
Terminal Designations
The terminals on the thermostat wallplate are wired according to the HVAC system type and thermostat configuration.
| Y1 | Y2 | W/E | W2 | 0 | B | |
| CONVENTIONAL HVAC | COOL MODE STAGE 1 | COOL MODE STAGE 2 | HEAT MODE STAGE 1 | HEAT MODE STAGE 2 | - | - |
| HEAT PUMP | 1H/1C | HEAT 2 AUX 1 | HEAT PUMP REVERSING VALVE - | |||
| 2H/1C | HEAT 1 COOL 1 | HEAT 2 AUX 2 | HEAT 3 AUX 1 | HEAT PUMP REVERSING VALVE - ENERGIZED DURING COOLING | ||
| 3H/1C | HEAT 2 COOL 2 | HEAT 3 AUX 2 | HEAT 4 AUX 1 | ENERGIZED DURING HEATING | ||
| 2H/2C | HEAT 2 COOL 2 | HEAT 3 AUX 2 | HEAT 4 AUX 2 | |||
| 3H/2C | HEAT 2 COOL 2 | HEAT 3 AUX 1 | HEAT 4 AUX 2 | |||
| 4H/2C | HEAT 2 COOL 2 | HEAT 3 EMHEAT | HEAT 4 EMHEAT |
Note: Devices like float switches that mechanically break circuits should be installed to break the control wire (Y), not the power (R). Interrupting the power circuit will shut off power to the thermostat and prevent operation.
Wiring Tips
Wire Specifications
Use shielded or non-shielded 18-22 gauge thermostat wire.
Note: In many heat pump systems without an emergency heat relay, a jumper can be installed between E and W2 to enable single-stage Emergency Heat Operation.
Wiring Diagrams
Typical 2H/2C System: 1 Transformer
This diagram illustrates the wiring for a typical 2-stage heat, 2-stage cool system using a single transformer. It shows connections from the thermostat terminals (RC, RH, Y, C, W/E, G, W2, Y2) to various relays (Compressor Relay, Heat Relay, Fan Relay, Heat Relay 2, Compressor Relay 2) and the power supply (R, C, L1, L2).
Typical Cool-Only System With Fan
This diagram shows the wiring for a cool-only HVAC system with fan control. It details connections from thermostat terminals (RC, RH, Y, C, W/E, G) to Compressor Relay and Fan Relay, powered by R, C, L1, L2.
Typical Heat Only System With Fan
This diagram illustrates the wiring for a heat-only HVAC system with fan control. It shows connections from thermostat terminals (RC, RH, Y, C, W/E, G) to Heat Relay and Fan Relay, powered by R, C, L1, L2. A note indicates that a jumper can be installed between E and W2 in systems without an emergency heat relay.
Typical 3H/2C or 2H/1C Heat Pump System
This diagram depicts wiring for heat pump systems with up to 3 stages of heat and 2 stages of cool, or 2 stages of heat and 1 stage of cool. It includes connections for Compressor Relay, Emergency Heat Relay, Fan Relay, Auxiliary Heat Relay, Compressor Relay 2, Cool Reversing Valve, Heat Reversing Valve, and power supply.
Typical 2H/2C System: 2 Transformers
This diagram shows wiring for a 2-stage heat, 2-stage cool system utilizing two transformers. It includes connections for Compressor Relay, Fan Relay, Compressor Relay 2, Heat Relay, Heat Relay 2, and power supply. An instruction to "REMOVE JUMPER" is present.
Technician Setup
Follow these steps to configure installer options:
- Press the MENU button.
- Press and hold the TECHNICIAN SETUP button for 3 seconds.
- Configure installer options using the table below.
- Use the [minus-sign] or [plus-sign] keys to change settings and the NEXT STEP or PREV STEP key to navigate. Press DONE to exit.
Setup Options
| Tech Setup Steps | LCD Will Show | Adjustment Options | Default |
| Setup WiFi | WIRELESS SETUP | WiFi router parameter configuration | |
| Filter Change Reminder | FILTER OFF / SE | Filter reminder from OFF to 2000 hours (in 50-hour increments) | OFF |
| Room Temperature Calibration | CALIBRATE / °F | Adjust room temperature display +/- 4° from factory calibration | 0 |
| Minimum Compressor On Time | MIN COMP / OF | Select minimum compressor run time: OFF, 3, 4, or 5 minutes | OFF |
| Compressor Short Cycle Delay | COMP PROTECTS / ON | Compressor delay ON/OFF (5-minute delay) | ON |
| Cooling Differential or Swing | COOL SWING / 0.5°F | Cooling differential adjustable from 0.2° to 2.0° | 0.5 |
| Heating Differential or Swing | HEAT SWING / 0.4°F | Heating differential adjustable from 0.2° to 2.0° | 0.4 |
| Heat Pump | HEAT PUMP / OF | OFF: Conventional systems ON: Heat pump systems | OFF |
| System Set | SYSTEM SET / SYSTEM | Configure system application (Heat-Off-Cool, Heat-Off, Cool-Off, Heat-Off-Cool-Auto). AUTO = Auto Changeover. | OFF |
| Stages of Heat + Cool | 2H2C / STAGES OF HEAT-COOL | Select stages of heat (1-4) and cool (1-2) for conventional or heat pump systems. 3 or 4 heat stages use Y1 and Y2. | 2 STAGES |
| Cooling Fan Delay | COOL FAN DELAY / OF | Cooling fan delay: OFF, 15, 30, 60, or 90 seconds | OFF |
| Heating Temperature Setpoint Limit | HEAT LIMIT / 90°F | Maximum heat setpoint: 44°F - 90°F | 90° |
| Cooling Temperature Setpoint Limit | COOL LIMIT / 44°F | Minimum cool setpoint: 44°F - 90°F | 44° |
| F° or C° | F OR C SET / 83°F | Select Fahrenheit or Celsius readout | F° |
| 12 or 24 hour clock | 12H / 24H | Select 12 or 24 hour clock setting | 12 Hour Clock |
| Fan Operation | GAS / FAN OPERATION | Select GAS for heating systems controlling fan during heat call, or ELEC for thermostat controlling fan during heat call. | GAS |
| Morning Recovery | MORNING RECOVERY / ON | Start heating early to reach setpoint by WAKE time. ON/OFF. | ON |
| Display Light | AUTO / dL | Display light ON: Any key press (AUTO) or Always ON (dL). | AUTO |
| Contractor Call Number | PHONE NUM / OF | ON: Displays phone number. OFF: Disables feature. | OFF |
| Beep | BEEP / OF | Audible beep when any key is pressed. ON/OFF. | ON |
| MACID | MACID / 980863079022 | Displays the MAC address of the WiFi module. | |
| Firmware Version | FIRMWARE VER 0100 | Displays the installed firmware version. | |
| Factory Default Reset | RESET TO DEFAULT / NO | Resets all WiFi settings to factory defaults. Press YES to reset. | NO |
Programming
Differential or Swing Setting Tip
The second stage activates at 2x the differential setting and deactivates at 1x the differential. For example, with a 0.5° differential and a 70°F setpoint for heating: first stage turns on around 69.5°F, second stage around 69°F. Second stage turns off at 69.5°F, first stage at 70.5°F. A third stage would turn on at 68.5°F and off at 69°F.
Keypad Lockout
To lock or unlock the keypad, hold down the MENU button for 3 seconds after exiting Tech Setup.
Contractor Call Number Note
If Contractor Call Number is set to ON, the phone number will display after a continuous 24-hour call for heating/cooling or if the FAN button is held for 3 seconds. To remove the number, hold the FAN button for 3 seconds.
Set Time of Day and Day of the Week
- Press the MENU button.
- Press SET TIME.
- The day of the week will flash. Use the [plus-sign] or [minus-sign] key to select the current day.
- Press NEXT.
- The current hour will flash. Use the [plus-sign] or [minus-sign] key to select the current hour. Ensure correct AM/PM is selected for 12-hour time.
- Press NEXT.
- Minutes will flash. Use the [plus-sign] or [minus-sign] key to select current minutes.
- Press DONE when completed.
Programming Schedules
- Select HEAT or COOL using the System key. Heat and cool must be programmed separately.
- Press MENU.
- Press SET SCHED. Monday and the WAKE icon will display. You are now programming the WAKE period for that day.
- Time will flash. Use the [plus-sign] or [minus-sign] key to set the time for the WAKE period. To have the fan run continuously during this period, select ON with the FAN key.
- Press NEXT.
- The setpoint temperature will flash. Use the [plus-sign] or [minus-sign] key to set the temperature for the WAKE period.
- Press NEXT.
- Repeat steps 4-7 for the LEAVE, RETURN, and SLEEP time periods for that day.
- Repeat steps 4-8 for Tuesday, Wednesday, Thursday, Friday, Saturday, and Sunday.
Factory Default Program
The thermostat ships with an energy-saving pre-program. Weekdays can share a program, with separate programs for Saturday and Sunday. Each program has four time periods: WAKE, LEAVE, RETURN, SLEEP.
| Day of the Week | Events | Time | Setpoint Temperature (HEAT) | Setpoint Temperature (COOL) |
| Weekday | Wake | 6 AM | 70°F (21°C) | 75° F (24° C) |
| Leave | 8 AM | 62°F (17° C) | 83°F (28° C) | |
| Return | 6 PM | 70°F (21° C) | 75° F (24° C) | |
| Sleep | 10 PM | 62°F (17° C) | 78° F (26° C) | |
| Saturday | Wake | 6 AM | 70°F (21° C) | 75° F (24° C) |
| Leave | 8 AM | 62°F (17° C) | 83° F (28°C) | |
| Return | 6 PM | 70°F (21° C) | 75° F (24° C) | |
| Sleep | 10 PM | 62°F (17° C) | 78° F (26° C) | |
| Sunday | Wake | 6 AM | 70°F (21° C) | 75° F (24° C) |
| Leave | 8 AM | 62°F (17°C) | 83°F (28° C) | |
| Return | 6 PM | 70°F (21° C) | 75° F (24° C) | |
| Sleep | 10 PM | 62°F (17° C) | 78° F (26° C) |
Thermostat Quick Reference
A Note About Auto Changeover
In Auto mode, you can switch between Auto Heat or Auto Cool by pressing the System key, once the current mode's setpoint is reached. For example, if in Auto Heat, the heat setpoint must be satisfied before switching to Auto Cool. To switch out of Auto, hold down the System key. To return to Auto, toggle the System key to Auto.
A Note About Programmable Fan
The programmable fan feature runs the fan continuously during any programmed ON time period. This helps circulate air and eliminate hot and cold spots.
Reminders Note
Once a Reminder is set, its elapsed time can be checked in Tech Setup. The elapsed time will appear in the text field. It can also be reset by pressing and holding the third button from the left for 3 seconds. Resetting an expired Reminder can be done without entering Tech Setup by pressing and holding the 3rd button from the left for 3 seconds.
Setting Up WiFi Connection and App
The Robertshaw RS10420T Programmable WiFi Thermostat works with the Robertshaw Thermostat App, available for iOS and Android platforms. Download the App from the Apple Store or Google Play.
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Contact and Warranty Information
Robertshaw
Customer Service: +1.800.304.6563
Technical Service: +1.800.445.8299
Email: HVACCustomerService@robertshaw.com
Website: www.robertshaw.com
Phone: 352-00308-001
6 Year Limited Warranty
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