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Need help?Do you have a question about the Source 1 S1-THEH21NS and is the answer not in the manual?
General| Brand | Source 1 |
|---|---|
| Model | S1-THEH21NS |
| Category | Thermostat |
| Language | English |
Disconnect power before servicing and follow all installation instructions carefully.
Replace batteries annually or when 'Low Battery' icon appears for reliable operation.
Device operates under FCC rules, subject to conditions to prevent interference.
Controls system mode (Cool/Off/Heat) and fan operation (Auto/On).
Allows user to adjust the desired temperature setting using buttons.
Manages auxiliary heat mode: Emergency, Normal, or Lockout selection.
Shows current room temperature, set temperature, and system status indicators.
Icons indicate heating or cooling is active; they flash when the system is energized.
Displays current room temperature and the desired set temperature.
Alerts the user when battery power is low, indicating replacement is needed.
Indicates when the auxiliary heating system has been activated.
Set Mode switch to Cool/Heat; Fan switch to Auto for typical operation.
Use the Cooler/Warmer buttons to adjust the desired room temperature.
Disables compressor, uses only Aux Heat to satisfy heating demand.
Allows Aux Heat to run alongside the heat pump for heating demand.
Prevents Auxiliary Heat from activating under any heating demand.
Press and hold Cooler/Warmer buttons simultaneously until Celsius is displayed.
Repeat the button press process to display temperature in Fahrenheit.
Flat Blade Screwdriver and Wire Cutter/Stripper are required for installation.
Ensure heat pump works, unpack carefully, and turn off power at the fuse panel.
Carefully remove the old thermostat cover, checking for screws if necessary.
Loosen base screws, disconnect wires, tape and label terminals for re-connection.
Retain the old thermostat for comparison until the new unit is fully functional.
Press down on the battery cover to open the slot and pull it out to access batteries.
Remove old AA alkaline batteries and insert new ones into the compartment.
Place the bottom hook of the battery cover into the slot and snap it closed.
Match old thermostat terminals to new thermostat connectors using the provided chart.
Do not remove the thermal insulating label to prevent wall drafts affecting readings.
For residential heat pumps, split systems, package units with no auxiliary heat.
Connect thermostat wires to equipment based on terminal labels and diagram.
Common wire is optional; if unused, thermostat is battery-powered.
For residential heat pumps with auxiliary heat and 2 stages of heat.
Connect thermostat wires to equipment based on terminal labels and diagram.
Common wire is optional; if unused, thermostat is battery-powered.
For residential heat pumps with B reversing valve, no auxiliary heat.
Connect thermostat wires to equipment based on terminal labels and diagram.
Common wire is optional; if unused, thermostat is battery-powered.
For residential heat pumps with B reversing valve and auxiliary heat.
Connect thermostat wires to equipment based on terminal labels and diagram.
Common wire is optional; if unused, thermostat is battery-powered.
Set Mode to HEAT, adjust temp 10 deg above room, check HVAC unit energizes.
Set Aux Heat switch to NORMAL and verify Aux Heat icon appears.
Details conditions for 1st and 2nd stage heating based on setpoint and deadbands.
Set Mode to COOL, adjust temp 10 deg below room, check HVAC unit energizes.
Set Mode to OFF and Fan to ON to confirm continuous fan run.
If switches are stiff, loosen thermostat mounting screws slightly.
Check setpoint, mode, batteries, and Aux Heat switch position for AC issues.
Ensure Fan Switch is firmly set to the On or Auto position for fan operation.
Verify Aux Heat Switch is set to Normal, not Lockout, for engagement.
Check heating setpoint, mode, batteries, and Aux Heat switch for heating issues.
Product is warranted against defects in material/workmanship for one year from installation.
Excludes labor, installation, damage from misuse, voltage issues, or external factors.
