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.All Rights Reserved 69-1481-1 T8411R ELECTRONIC HEAT PUMP THERMOSTAT 5 FEET [1.5 METERS] YES NO NO NO M11338 T8411R ELECTRONIC HEAT PUMP THERMOSTAT 5 FEET [1.5 METERS] YES NO NO NO M11338 Fig. 1. Typical location of thermostat. The shape of the terminals permits insertion of straight or WALL WALL ANCHORS (2) WALLPLATE WHEN USING WALL ANCHORS, DRILL 3/16 INCH MOUNTING SCREWS (2) 1 1 HOLES FOR DRYWALL, 7/32 INCH HOLES FOR PLASTER OR WOOD. M12202A Fig. 2. Mounting wallplate to wall. Wiring IMPORTANT Use an 18-gauge maximum wire for wiring the T8411R Thermostat. All wiring must comply with local electrical codes and ordinances. CAUTION Electrical Shock or Equipment Damage Hazard. Can shock individuals or short equipment circuitry. Disconnect power supply before installation. TERMINAL SCREW M11334A G C R Y W1 L W2 E B O FOR STRAIGHT INSERTION STRIP 5/16 IN. (8 MM) FOR WRAPAROUND STRIP 7/16 IN. (11 MM) 1 NOT ALL MODELS HAVE BOTH O AND B TERMINALS. wraparound wiring connections; either method is acceptable. See Fig. 3. 1 Fig. 3. Wiring connections. NOTE: To ensure proper mounting of thermostat, restrict all wiring to the shaded area. See Fig. 4. 69-1481-1 2 T8411R ELECTRONIC HEAT PUMP THERMOSTAT KEEP WIRING IN SHADED AREA MOUNTING SCREW HOLE MOUNTING SCREW HOLE WIRING ENTRANCE HOLE M11331A G C R Y W1 L W2 E B O 1 NOT ALL MODELS HAVE BOTH O AND B TERMINALS.1 T8411R ELECTRONIC HEAT PUMP THERMOSTAT KEEP WIRING IN SHADED AREA MOUNTING SCREW HOLE MOUNTING SCREW HOLE WIRING ENTRANCE HOLE M11331A G C R Y W1 L W2 E B O 1 NOT ALL MODELS HAVE BOTH O AND B TERMINALS.1 Fig. 4. Restrict wiring to shaded area. Refer to Fig. 5 for typical wiring hookups. A letter code is located near each terminal for identification. 1. Loosen the terminal screws on the wallplate and connect the system wires. See Fig. 5. 2. Securely tighten each terminal screw. 3. Push the excess wire back into the hole. 4. Plug the hole with nonflammable insulation to prevent drafts from affecting the thermostat. Mounting Thermostat to Wallplate 1. Engage the tabs at the top of the thermostat and wallplate. 2. Swing down the thermostat and press the lower edge of the thermostat onto the wallplate to latch. See Fig. 6. L1 (HOT) L2 1 2 SYSTEM SWITCH HEAT OFF COOL R W2 L B O Y EM. HT. W1 E AUXILARY HEAT RELAY CHANGEOVER VALVE HEAT CHANGEOVER VALVE COOL COMPRESSOR CONTACTOR COMPRESSOR CONTACTOR HEAT FAN RELAY RELAY EMERGENCY HEAT RELAY G C THERMOSTAT LOGIC THERMISTOR SENSOR POWER SUPPLY ON AUTO STAGE 2 RELAY STAGE 1 RELAY FAN SWITCH 3 1 2 3 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. REMOVE JUMPER, WHEN SUPPLIED, FOR SYSTEMS WITH SEPARATE HEATING COMPRESSOR CONTACTOR (W1 SEPARATE FROM Y). NOT ALL MODELS HAVE BOTH O AND B TERMINALS. M11333A Fig. 5. T8411R two-stage heat and one-stage cool wiring diagram with manual changeover. 3 69-1481-1 T8411R ELECTRONIC HEAT PUMP THERMOSTAT SYSTEMCoolOffHeat EmHt AutoOn FAN DASHED LINES INDICATE TABS ON BACK OF THERMOSTAT ENGAGE TABS AT TOP OF THERMOSTAT A Set Room Em Ht Aux Ht T8411R ELECTRONIC HEAT PUMP THERMOSTAT SYSTEMCoolOffHeat EmHt AutoOn FAN DASHED LINES INDICATE TABS ON BACK OF THERMOSTAT ENGAGE TABS AT TOP OF THERMOSTAT A Set Room Em Ht Aux Ht WITH SLOTS ON MOUNTING PLATE. SYSTEMCoolOffHeat Em Ht AutoOn FAN PRESS LOWER EDGE OFB Em Ht Aux Ht Set Room CASE TO LATCH. M18541 Fig. 6. Mounting thermostat wallplate. FAN Switch Fan switch settings are: On: The fan runs continuously. Use for improved air circulation and air quality. Auto: Normal setting for most homes. The fan starts and stops with the equipment. Slide the FAN switch in the bottom left corner of the thermostat to select the desired fan setting. SYSTEM Switch System switch settings control thermostat operation as follows: Cool: The thermostat controls the cooling system. Off: Both heating and cooling are off. Heat: The thermostat controls the heating system. Em Ht: Thermostat cycles auxiliary heat (W2) and emergency heat relay (E) as needed to maintain setpoint. Terminal L is energized continuously. Fault heat relay is on continuously. Cooling system is off. Compressor is de-energized. Slide the SYSTEM switch in the bottom right corner of the thermostat to select the desired system setting. SYSTEMCoolOffHeat EmHt AutoOnFAN M18542 TEMPERATURE DISPLAY INCREASE SETTING DECREASE SETTING FAN SWITCH SYSTEM SWITCH Em Ht Aux Ht Set Room OPERATION Setting FAN and SYSTEM Switches Fan and system settings are controlled manually by using the switches located at the bottom of the thermostat case. See Fig. 7. Fig. 7. Digital display and system switches (FAN and SYSTEM). Em Ht and Aux Ht Indications The ^ indicator points to either Emergency Heat (Em Ht) or Auxiliary Heat (Aux Ht) when these modes are active. Em Ht: The ^ indicator points to Em Ht when the SYSTEM switch is set at Em Ht. Aux Ht: The ^ indicator points to Aux Ht when the auxiliary backup heat is needed to help handle the heating load. INDICATOR Em Ht Set Room M18425 69-1481-1 4 T8...