Download Honeywell T841A1316 User's Manual
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T841A Heating-Cooling Heat Pump Thermostat INSTALLATION INSTRUCTIONS APPLICATION The T841A Heating-Cooling TRADELINE® Thermostat provides 24 Vac control of two-stage heating and onestage cooling in heat pump systems, using manual changeover. This thermostat provides SYSTEM switch selections of EM. HEAT-HEAT-OFF-COOL and FAN switch selections of AUTO-ON. See Fig. 1. See Table 1 for T841A TRADELINE® specifications. Test holes are provided on the front of the thermostat to accommodate test meter probes without removing the thermostat from the wall. Remove the cover of the thermostat to expose the test holes, which are labeled to correspond with the terminals on the back of the thermostat. Table 1. T841A TRADELINE® Specifications. OS Number T841A1308 LED Indication EM. HEATa, AUX. HEAT Changeover Manual Cool or Heat T841A1316 T841A1423b T841A1464b,c T841A1498 Heat Anticipation Stage 2 fixed, 0 to 1.5A Terminal Designations G, R, W2, E, L, B, X, Y, O G, R, E, L, X W 2, B, W1, Y1, O Stage 2 W 3, G, R, W2, adjustable, 0.1 E, L, B, X, Y, to 1.2A O EM. HEAT, AUX. HEAT, CHECKd EM. HEAT Stage 2 fixed, 0 to 1.5A G, R, W, H, B, X, O, Y Remarks Use when E and W2 are jumpered. Does not replace T841A1068. Not for systems with E to W 2 jumper System Switch EM. HEAT, HEAT, OFF, COOL Auto Fan in EM. HEAT No Yes Exact replacement for York model no. 2TH11703324 T841A1506b a b c d EM. HEAT LED also indicates compressor malfunction. Premier White® color. Sold only in Australia: degrees C. CHECK LED indicates compressor malfunction. FRONT OF DEVICE BACK OF DEVICE COVER 80 80 70 60 50 70 60 THERMOMETER 50 SET POINT SCALE EM. HEAT HEAT OFF COOL CHECK FAN AUTO ON EM. HEAT AUX. HEAT SYSTEM SWITCH FAN SWITCH LED (UP TO THREE) MOUNTING HOLES (4) WIRING TERMINAL (UP TO 12) M2960A Fig. 1. External view of T841A. ®U.S. Registered Trademark Copyright © 1997 Honeywell Inc. • • All Rights Reserved X-XX UL 69-0452-8 T841A HEATING-COOLING HEAT PUMP THERMOSTAT OPERATION CAUTION 1. The stages of heat make sequentially as the temperature drops. Make refers to the mercury switch initiating a call for heat or cool. 2. There is about 1°F (0.6°C) between stages so the second stage (auxiliary heat) makes only when the first stage cannot handle the load. This 1°F is the interstage differential. 3. 4. The LED indicators on certain thermostat models light up when something specific happens within the system. When the green or amber LED lights, the auxiliary heat (second stage heat) is operating because the weather is so cold, the heat pump alone cannot handle the load. When the red EM. HEAT LED lights, the emergency heat is operating (usually electric strip heaters), because the homeowner has physically switched to the EM. HEAT position. See heating/cooling manufacturer instructions for specific meaning. 5. Disconnect power supply to prevent electrical shock or equipment damage. To prevent interference with the thermostat linkage, keep wire length to a minimum and run wires as close as possible to the thermostat base. Do not overtighten the thermostat captive mounting screws, because damage to the threads can result. Do not short across coil terminals on the relay. This can burn out the thermostat heat anticipator. Never install more than one wire per terminal unless a factory-supplied jumper with spade terminal is used. Location Locate the thermostat about 5 ft (1.5m) above the floor in an area with good air circulation at average room temperature. RECYCLING NOTICE Do not mount the thermostat where it can be affected by: — drafts, or dead spots behind doors and in corners. — hot or cold air from ducts. — radiant heat from sun, appliances or fireplaces. — concealed pipes and chimneys. — unheated (uncooled) areas such as an outside wall behind the thermostat. This control contains mercury in a sealed tube. Do not place the control in the trash at the end of its useful life. If this control is replacing a control that contains mercury in a sealed tube, do not place your old control in the trash. This thermostat is a precision instrument and was carefully adjusted at the factory. Handle it carefully. Contact your local waste management authority for instructions regarding recycling and the proper disposal of this control, or any control containing mercury in a sealed tube. Mounting and Wiring CAUTION Disconnect power supply before beginning installation. Can cause electrical shock or equipment damage. INSTALLATION The T841A can be mounted directly to a wall or horizontal outlet box. Choose the method that best fits your installation. When Installing this Product… 1. Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition. 2. Check the ratings given in the instructions and on the product to make sure the product is suitable for your application. 3. Installer must be a trained, experienced technician. 4. After installation is complete, check out product operation as provided in these instructions. 69-0452—8 In replacement applications, check the existing thermostat wires for cracked or frayed insulation. Replace wires in poor condition. All wiring must comply with local codes and ordinances. 2 T841A HEATING-COOLING HEAT PUMP THERMOSTAT SETTINGS 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. 1. Run the wiring (if necessary) to the location. If the wiring is plastered into the wall, make a hole next to the cable and loosen the wires so that they can be pushed back into the wall later. Thread the wires through the hole in the packing material saved above. Connect the wires to the terminals on the back of the thermostat. See Fig. 2 through 5. 2. Set the second stage adjustable heat anticipator to match the current draw of the primary heating control (see Heat Anticipator Setting section). 3. Push the excess wire back through the hole and plug any opening with packing material to prevent drafts that may affect thermostat performance. 4. Use screws to loosely secure the thermostat to the wall or outlet box through the two mounting holes in the middle of the device. Heat Anticipator Setting The second stage heat anticipator is adjustable. Move the adjustable indicator to match the current draw of the second stage heating primary control, or the anticipator setting of the old thermostat. See Fig. 6. Temperature Setting Move the setpoint lever to the desired control point on the temperature scale. SYSTEM Switch Setting The SYSTEM switch positions control the system operation as follows: EM. HEAT: Emergency heat relay is energized. Cooling system is off. Compressor is de-energized. Fan runs on call for heat if FAN switch is in the AUTO position. EM. HEAT LED is on. HEAT: Heating system is automatically controlled by the thermostat. Cooling system is off. OFF: Both the heating and cooling systems are off. If the fan is at the AUTO position, the cooling fan is also off. COOL: Cooling system is automatically controlled by the thermostat. Heating system is off. The sheetmetal screws included with the thermostat are designed for use in plaster walls that do not need anchors. IMPORTANT An incorrectly leveled thermostat causes inaccurate temperature control. FAN Switch Setting 5. Level the thermostat using a spirit level or plumb line. Tighten the two mounting screws at the middle of the device. 6. Install the two screws in the top mounting holes and tighten. 7. Replace the thermostat cover. AUTO: Fan operates in response to thermostat in both heating and cooling. ON: Fan operates continuously. L1 (HOT) L2 ODT 1 RTD 1 H1 C1 FALL H1 & C1 ANTICIPATOR EHR 1 1 RTD 2 ODT 2 FAN SWITCH ERH 2 RTD 3 FAN RELAY AUTO G ON R SYSTEM MONITOR H2 ANTICIPATOR RTD 1 W2 AUX. HT. LED (GREEN) E SYSTEM SWITCH H2 RD EM. HEAT RELAY L EM. HEAT FALL HEAT B OFF EM. HT. LED 2 (RED) COOL CHANGEOVER RELAY (HEAT) X 3 LACO COMPRESSOR CONTACTOR CHP Y 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 WHEN SYSTEM MONITOR IS CONNECTED TO L TERMINAL, EM. HT. LED ALSO INDICATES COMPRESSOR MALFUNCTION. 3 X TERMINAL MUST BE CONNECTED FOR PROPER OPERATION. CHANGEOVER RELAY (COOL) O M1099B Fig. 2. Internal schematic and typical wiring diagram for TRADELINE® T841A1308 with EM. HEAT and AUX. HEAT LEDs. No fan control in EM. HEAT. Provides heat or cool changeover relay control. 3 69-0452—8 T841A HEATING-COOLING HEAT PUMP THERMOSTAT L1 (HOT) L2 1 CHANGEOVER RELAY (COOL) O L FALL H1 FAN SWITCH C1 EM. HT. LED (RED) AUTO SYSTEM MONITOR 3 FAN RELAY G H1 ANTICIPATOR ON R C1 ANTICIPATOR E 4 EM. HT. RELAY X AUX. HT. LED (GREEN) W2 SYSTEM SWITCH FALL AUX. HT. RELAY B EM. HT. H2 CHANGEOVER RELAY (HEAT) HEAT W1 2 OFF JUMPER HEAT RELAY 1 Y1 COOL H2 ANTICIPATOR COMPRESSOR CONTACTOR 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 REMOVE W1-Y1 JUMPER WHEN HEAT RELAY 1 IS USED. 3 WHEN L TERMINAL IS CONNECTED TO SYSTEM MONITOR, EM. HEAT LED ALSO INDICATES COMPRESSOR MALFUNCTION. 4 X TERMINAL MUST BE CONNECTED FOR PROPER OPERATION. M1103E Fig. 3. Internal schematic and typical wiring diagram for SUPER TRADELINE® T841A1316 with AUX. HEAT and EM. HEAT LEDs. Provides heat or cool changeover relay control and automatic fan in EM. HEAT mode. AUTO G ON FAN SWITCH FALL H1 C1 R H1/C1 ANTICIPATOR FAN RELAY L1 (HOT) L2 W 1 HEAT RELAY H "H" RELAY 2 B EM. HT. LED (RED) SYSTEM SWITCH H2 ANTICIPATOR 3 X EM. HT. RELAY EM. HT. HEAT O OFF FALL CHANGEOVER RELAY (COOL) COOL H2 Y 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 B TERMINAL MUST BE CONNECTED FOR PROPER OPERATION. 3 AUTO FAN IN EM. HEAT. COMPRESSOR CONTACTOR M3171B Fig. 4. Internal schematic and typical wiring diagram for TRADELINE® T841A1498 and T841A1506 with EM. HEAT LED. Provides cooling changeover relay control. 69-0452—8 4 T841A HEATING-COOLING HEAT PUMP THERMOSTAT L1 L2 (HOT) 1 ODT 1 RTD 1 W3 8 EHR 1 RDT 2 FAN SWITCH H1 C1 RD FALL ODT 2 AUTO 5 ON H1/C1 ANTICIPATOR EHR 2 9 RTD 3 G 3 FAN REALY R W2 AUX. HT. LED (GREEN) 4 12 RTD 1 E EM. HT. LED (RED) EM. HT. RELAY 11 H2 FALL 2 L SYSTEM SWITCH CHECK LED (RED) 10 SYSTEM MONITOR EM. HT. B 6 HEAT HEAT CHANGEOVER VALVE OFF X COOL CHP LACO Y COMPRESSOR CONTACTOR O 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 AUTO FAN IN EM. HEAT. COOL CHANGEOVER VALVE M6059C .1 2 .10 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 automatic fan in EM. HEAT mode. 5 LONGER .1 1.2 .8.6 .4 .3 .2 EM.HEAT HEAT OFF COOL MOVE INDICATOR TO MATCH CURRENT RATING OF PRIMARY CONTROL M2962B Fig. 6. Second stage adjustable heat anticipator indicator. 5 69-0452—8 T841A HEATING-COOLING HEAT PUMP THERMOSTAT Cooling CHECKOUT CAUTION 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. Heating and fan should shut off. Do not operate cooling if outdoor temperature is below 50°F (10°C). Refer to manufacturer recommendations. Move the SYSTEM switch on the thermostat to COOL and the FAN switch to AUTO. Move the setpoint lever about 10°F (6°C) below the room temperature. Cooling and fan should start. Move the setpoint lever about 10°F (6°C) above the room temperature. Cooling and fan should shut off. NOTE: To prevent compressor short cycling, a minimumoff timer may be included to prevent the compressor from starting for up to five minutes from when the thermostat last turned the compressor off, or from when the system first received power. Fan Move the SYSTEM switch to OFF, and the FAN switch to ON. The fan should run continuously. Move the FAN switch to AUTO. In this position, the fan operates in response to the thermostat in both heating and cooling. Automation and Control Solutions Honeywell Limited-Honeywell Limitée Honeywell International Inc. 35 Dynamic Drive 1985 Douglas Drive North Scarborough, Ontario M1V 4Z9 Golden Valley, MN 55422 69-0452—8 J.S. Rev. 5-97 6 www.honeywell.com/yourhome