COVER THERMOMETER SET POINT SCALE AUTO EM. HEAT AUX. HEAT LED (UP TO THREE) FAN SWITCH Fig. 1. External view of T841A. • All Rights Reserved X-XX UL INSTALLATION INSTRUCTIONS System Remarks Switch , E, Use when E EM. HEAT,...
Disconnect power supply before beginning installation. Can cause electrical shock or equipment damage. The T841A can be mounted directly to a wall or horizontal outlet box. Choose the method that best fits your installation. In replacement applications, check the existing thermostat wires for cracked or frayed insulation.
Grasp the thermostat cover at the top and bottom with one hand. Pull outward on the bottom edge of the cover until it snaps free of the thermostat base. Carefully remove and save the packing material surrounding the mercury switches.
T841A HEATING-COOLING HEAT PUMP THERMOSTAT FALL H1 ANTICIPATOR C1 ANTICIPATOR FALL H2 ANTICIPATOR POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. REMOVE W1-Y1 JUMPER WHEN HEAT RELAY 1 IS USED. WHEN L TERMINAL IS CONNECTED TO SYSTEM MONITOR, EM. HEAT LED ALSO INDICATES COMPRESSOR MALFUNCTION.
Fig. 5. Internal schematic and typical wiring diagram for TRADELINE® T841A1423 and T841A1464 (sold only in Australia) with AUX. HEAT, EM. HEAT and CHECK LEDs. Provides heat or cool changeover relay control and Fig. 6. Second stage adjustable heat anticipator indicator. T841A HEATING-COOLING HEAT PUMP THERMOSTAT SWITCH AUTO AUX.
T841A HEATING-COOLING HEAT PUMP THERMOSTAT CHECKOUT Heating Move the SYSTEM switch on the thermostat to HEAT and the FAN switch to AUTO. Move the setpoint lever to about 10°F (6°C) above the room temperature. Heating should start and the fan should run. Move the setpoint lever about 10°F (6°C) below the room temperature.