RS8110 Installation Manual
INSTALLATION MANUAL Thank you for purchasing a Robertshaw thermostat. This manual will describe how to install and test the Robertshaw RS8110 thermostat.
INSTALLATION LOCATION Install the thermostat 4 to 5 feet above the floor in an area with good air circulation and average temperature. For new installations, mount thermostat on an inside wall, 4-5 feet above the floor.
THERMOSTAT QUICK REFERENCE Getting to know your thermostat a Room Set At LCD Room Set At Cool SYSTEM FAN ON AUTO COOL OFF HEAT Low Battery Indicator: Replace batteries when Indicator is shown. Indicates the current room temperature. 1 LCD Display 2 Fan Switch 3 System Switch 4 Temperature Set-Point Buttons 5 Easy change battery door Displays the user selected set-point temperature. System operation indicators: The COOL, HEAT or FAN icon will display when the COOL, HEAT or FAN is on.
WALLPLATE INSTALLATION Caution: Electrical Hazard. Disconnect power before installing this product. Failure to do so can cause electric shock or equipment damage. For a vertical mount, put screws on the top and bottom. Mercury Notice: This product is mercury-free. However, if this product is replacing a control which contains mercury, it needs to be disposed of properly. Contact your local waste management authority for instructions regarding recycling and proper disposal of the control.
WIRING 1 Turn Off Power to Heating/Cooling System or Circuit breaker box Heating/cooling system power switch 2 Remove Old Thermostat Remove old thermostat but leave wallplate with wires attached.
WIRING 3 Label Wires with Tags Label the wires using the supplied wire labels as you disconnect them. 4 Separate Wallplate from New Thermostat Remove wallplate from the new thermostat and mount onto wall. Wiring Labels Apply these wiring labels to each wire with the appropriate terminal designation as you remove it from the existing thermostat.
WIRING 5 Separate Wallplate from New Thermostat Mount the new wallplate using the included screws and anchors. G E Y RH /R Drill 3/16-in. holes for drywall Drill 3/16-in.
WIRING 6 Connect Wires Simply match wire labels. If labels do not match letters on the thermostat, check “Alternate Wiring (Conventional Systems)” on page 9 and connect to terminal as shown (see notes, below).
WIRING Alternate Wiring (Conventional Systems) If labels do not match letters on the thermostat, check the chart below and connect to terminal as shown here (See notes, below). 1 2 3 4 Remove metal jumber if wires will be connected to both RH/R and RC terminals. If a 24 volt common wire is present (typically labeled C or X) connect it to the C terminal. The C terminal is not used if a 24 volt common wire is not present.
WIRING Terminal Designations W Heat relay G Fan relay Y Compressor relay O Heat pump reversing valve energized in cooling RC 24 volt cooling transformer RH/R 24 volt heating transformer OR 24 volt power terminal if a common wire is present B Heat pump reversing valve energized in heating C 24 volt common terminal Notes: RH & RC terminals In a single-transformer system, leave the metal jumper in place between the RH and RC. Remove the metal jumper in two-transformer systems.
WIRING 1 Power supply. 2 Factory-Installed jumper. Remove only when installing on 2-transformer systems. 3 Use either O or B terminals for reversing valve. Heat pump application ONLY. 4 Use a small piece of wire (not supplied) to connect W and Y terminals. 5 Set fan operation switch to either gas or electric based on your system. 6 Optional 24 VAC common connection not to be used when powering thermostat with batteries.
WIRING Typical 1H/1C heat pump system Typical heat-only system L2 L1 (HOT) L2 L1 (HOT) COMPRESSOR RELAY COOL REVERSING VALVE FAN RELAY HEAT REVERSING VALVE Typical heat-only system with fan HEAT RELAY Typical cool-only system L2 L2 L1 (HOT) L1 (HOT) COMPRESSOR RELAY FAN RELAY HEAT RELAY Tips: 24 V common wire may not be present in all systems.
INSTALLER SETUP MENU Gas or Electric Setup Select GAS or ELEC depending on the type of furnace. If ELEC is selected, the thermostat will operate the fan when the fan relay is connected to the G terminal.
INSTALLER SETUP MENU Adjusting the Differential (Also called Swing or Cycle rate) Adjusting Room Temperature Calibration, Fahrenheit/Celcius Display and Compressor Delay The differential is adjustable, a smaller differential will cause more frequent cycles and a larger differential will cause fewer cycles. There are separate differentials for heat and for cool. Follow the steps below to adjust the differential for heat or cool: 4.
MOUNTING & BATTERY INSTALLATION Mount Thermostat Align the 4 tabs on the subbase with corresponding slots on the back of the thermostat, then push gently until the thermostat snaps in place. Room Set At Cool SYSTEM FAN ON AUTO COOL HEAT Battery Installation Battery installation is optional if used with AC power (the C terminal is connected). During power outages, the batteries will save settings and power the display. 1.5 V AAA 1.5 V AAA Insert 2 AAA Alkaline batteries (included).
SPECIFICATIONS Temperature Display Range................41°F to 95°F (5°C to 35°C) Temperature Control Range................44°F to 90°F (7°C to 32°C) Load Rating.........................................1 amp per terminal, 1.5 amp maximum all terminals combined Display Accuracy.................................± 1°F Differential...........................................Heating is adjustable from 0.2°F to 2.0°F Cooling is adjustable from 0.2°F to 2.0°F Power Source......................................
Customer Service +1.800.304.6563 Technical Service +1.800.445.8299 Year HVACCustomerService@robertshaw.com Limited www.robertshaw.com • 352-00301-001 Rev. B Warranty © 2021 Robertshaw Controls Company. Robertshaw® is a trademark of Robertshaw Controls Company.
