T87 Thermostats and Q7L Subbases Installation Instructions for the Trained Service Technician. APPLICATI INSTALLATI INSTUCTIS The T87 Thermostat and Q7L Subbase provide to 0 Vac control of -stage heating and -stage cool-ing heat pump systems with manual changeover. Q7L Subbase provides EM.HT.--- system switching and - fan switching. See Table for specific T87/Q7L combinations. a b Thermostat/ Subbase Package 9 900 9 9 9 97 998 b 970 b 97 9797 Thermostat/ Subbase Model Numbers T87/ Q7L07 T877/ Q7L0 T87/ Q7L87 T878/ Q7L70 T8787/ Q7L7 T87889/ Q7L7 T8790/ Q7L777 T879/ Q7L777 T879/ Q7L87 T87988/ Q7L88 Table. Thermostat/Subbase Specifications. LED Indication Changeover Comments AU.HT., AU.HT., a AU.HT.,, CHECK AU.HT.,, CHECK Manual Cool TADELINE ; adjustable stage heat anticipation. Fixed anticipation in stage. Auto fan in EM.HT. Manual Heat or Cool Manual Heat or Cool Manual Heat or Cool TADELINE ; fixed heat anticipation. Auto fan in EM.HT. SUPE TADELINE ; fixed heat anticipation. Factory installed jumper across W and. Auto fan in EM.HT. TADELINE ; fixed heat anticipation. Auto fan in EM.HT. Manual Cool TADELINE ; exact replacement for ork model no. TH70. Manual Cool TADELINE ; exact replacement for ork model nos. TH70 and TH70. Manual Cool TADELINE ; exact replacement for ork model nos. TH70 and TH70. Includes C8A0 utdoor Thermistor. Manual Cool TADELINE ; exact replacement for ork model no. TH70. AU.HT., a Manual Cool equires C8A utdoor Thermister for outdoor reset. Fixed stage heat anticipation. No heat anticipation in stage heat. Auto fan in EM.HT. eplaces 9. AU.HT., EM.HT. EM.HT. LED also shows compressor malfunction. Premier White color. Manual Heat or Cool See Fig. 7 8 0 9 TADELINE 9 U.S. egistered Trademark Copyright 997 Honeywell Inc. All ights eserved - UL 9-09-9
PEATI n a -heat thermostat, the two stages of heat make sequentially as the temperature drops. Make refers to the mercury switch initiating a call for heat or cool. There is about F (0. C) between stages so the second stage makes only when the first stage can not handle the load. The F (0. C) is referred to as the interstage differential. The light emitting diodes (LED) on the subbase light when something specific happens within the system. When an LED lights, refer to this list for the meaning: : Emergency heat is operating. The compressor has failed, and the heat pump is not operating. LED lights when system switch is placed in the EM.HT. position by the homeowner. AU.HT.: Auxiliary heat is operating, which means the weather is so cold that the heat pump cannot handle the load. CHECK: System needs to be checked. See heating sys-tem instructions for specific meaning. NTE: LEDs are not field replaceable or addable. ECCLIN NTICE This control contains mercury in a sealed tube. Do not place control in the trash at the end of its useful life. If this control is replacing a control that contains mer-cury in a sealed tube, do not place your old control in the trash. Contact your local waste management authority for instructions regarding recycling and the proper disposal of this control, or of an old control containing mercury in a sealed tube. INSTALLATI When Installing this Product. ead these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition.. Check the ratings given in the instructions and on the product to make sure the product is suitable for your application.. Installer must be a trained, experienced service technician.. After installation is complete, check out product operation as provided in these instructions. CAUTI. 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 subbase.. Push excess wire back into the hole and plug hole to prevent drafts from affecting thermostat operation.. Do not overtighten thermostat captive mounting screws because damage to subbase threads can result.. Do not short across coil terminals on heating relay or gas valve. This can burn out the thermostat heat anticipator.. Never install more than one wire per terminal unless factory-supplied jumper with spade terminals is used. IMPTANT Thermostats are calibrated at the factory using subbase mounted at true level. Inaccurate subbase leveling causes the actual temperature to deviate from the setpoint temperature. Location Install the thermostat about ft (.m) above the floor in an area with good air circulation at average temperature. Do not install 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 or appliances. concealed pipes and chimneys. unheated (uncooled) areas such as an outside wall behind the thermostat. Mounting The Subbase The thermostat subbase can be mounted on a vertical outlet box, horizontal outlet box or directly on the wall.. If you must mount the subbase on a vertical outlet box, order Honeywell 9A Adapter Assembly. See Fig.. The assembly includes an adapter ring, two screws and a cover plate to cover marks on the wall. Install the ring and cover plate on the vertical outlet box. For a wall installation, hold subbase in position and mark holes for anchors. See Fig.. btain wall anchors locally. e careful that the wires do not fall back into the wall opening. Set aside subbase. Drill two / in. ( mm) holes and gently tap anchors into the holes until flush with the wall. 9-09 9
VETICAL UTLET ADAPTE IN CVE PLATE. Secure the cover plate (if used) and subbase with the screws provided. Do not fully tighten the subbase screws.. Level the subbase by using a spirit level. Firmly tighten subbase mounting screws. See Fig.. The subbase mounting holes provide for minor out-oflevel adjustments. SCEWS () IMPTANT An incorrectly leveled subbase causes the temperature control to deviate from setpoint. HIZTAL UTLET NT INCLUDED WITH UNIT. SUASE SUASE ACCESS PATS AVAILALE (9A). SCEWS () SCEWS () Fig.. Installation of subbase on outlet box. M9 Wiring the Subbase All wiring must comply with local electrical codes and ordinances. Follow equipment manufacturer wiring instructions when available. To wire subbase, proceed as follows:. Connect the system wires to the subbase. See Fig. -. A letter code for identification is located near each terminal. The terminal barrier permits straight or conventional wraparound wiring connection. See Fig... Firmly tighten each terminal screw.. Fit wires as close as possible to the subbase. Push excess wire back into the hole.. Plug the hole with nonflammable insulation to prevent drafts from affecting the thermostat. SPIIT LEVEL TP HLES () WIIN TEMINAL THEMSTAT CALE PENIN WALL WIES THUH WALL PENIN WALL ANCHS () HLES HLES () PST () F THEMSTAT T SPIN FINE CTACTS THE THEMSTAT (UP T ) M97 M9 SUASE SCEWS () Fig.. Subbase components and leveling procedure. Fig.. Installation of subbase on wall.. un wires to the thermostat location.. Pull wires through the cover plate (if used) and subbase cable opening. See Fig.. IMPTANT Use 8 gauge, color-coded thermostat cable for proper wiring. F STAIHT INSETI STIP / IN. (8 MM) AIE SUASE TEMINAL SCEW Fig.. Wiring connections. F WAPAUND STIP 7/ IN. ( MM) M98 9-09 9
THEMSTAT SUASE CMPENTS H H C PWE SUPPL. PVIDE DISCNECT MEANS AND VELAD PTECTI AS EQUIED. FIELD EMVALE JUMPE. FAN LED (EEN) LED (ED) W U F T FAN ELA MIT UTD THEMSTAT ELA AU. E ELA L (HT) L UTD THEMIST CHANEVE VALVE M970 Fig.. Internal schematic and typical wiring diagram for 97 (T879/Q7L87). eplaces E A8078, A89; Trane aystat 9, aystat 9 and aystat 0; and Honeywell 9 Thermostats. THEMSTAT SUASE CMPENTS (HT) L L H/C DT H C FAN W TD EH TD DT H H W LED (EEN) LED (ED) L MIT EH TD TD D FAN ELA E CHANEVE VALVE ELA LAC CHP CTACT PWE SUPPL. PVIDE DISCNECT MEANS AND VELAD PTECTI AS EQUIED. AUILIA LED AVAILALE SME MDELS. Fig.. Internal schematic and typical wiring diagram for 9 (T87/Q7L07). M07A 9-09 9
THEMSTAT SUASE CMPENTS H C H/C ANTICIAPT FAN TD DT EH TD DT L (HT) L EH TD H H PWE SUPPL. PVIDE DISCNECT MEANS AND VELAD PTECTI AS EQUIED. CNECT CHANEVE ELA T F CHANEVE, T F CHANEVE. 8 0 LED (ED) LED (EEN) CHANEVE VALVE Fig. 7. Internal schematic and typical wiring diagram for 900 (T877/Q7L0); fixed anticipation. L W E LAC MIT D CTACT CHP TD FAN ELA ELA CHANEVE VALVE M00A THEMSTAT SUASE CMPENTS W W ELA H FAN L CHANEVE VALVE MIT FAN ELA C L (HT) L H C H H LED (ED) LED (N) W E ELA ELA CHANEVE VALVE W ELA PWE SUPPL. PVIDE DISCNECT MEANS AND VELAD PTECTI AS EQUIED. W EMVE JUMPE WHEN W ELA IS USED. FACT-INSTALLED JUMPE. ELA M07 Fig. 8. Internal schematic and typical wiring diagram for 9 (T87/Q7L87). SUPE TADELINE ; universal model for heat, cool, or first stage heating changeover systems. CHECK LED has isolated terminals for use in all systems. 9-09 9
THEMSTAT SUASE CMPENTS L (HT) L H C H/C FAN FAN ELA ELA W H H ESET E LED (ED) PWE SUPPL. PVIDE DISCNECT MEANS AND VELAD PTECTI AS EQUIED. H T "H" ELA ELA CHANEVE VALVE () CTACT C8A09 THEMIST M7A Fig. 9. Internal schematic and typical wiring diagram for 9 (T8787/Q7L7) and 970 (T879/Q7L777). Exact replacement for ork model no. TH70. THEMSTAT SUASE CMPENTS W ELA W H C FAN CHECK LED (ED) L CHANEVE VALVE MIT FAN ELA L (HT) L H H C H EM.HT. LED (ED) LED (EEN) W E ELA ELA CHANEVE VALVE PWE SUPPL. PVIDE DISCNECT MEANS AND VELAD PTECTI AS EQUIED. ELA M08 Fig. 0. Internal schematic and typical wiring diagram for 9 (T878/Q7L70). TADELINE; intended for use in applications where W and E terminals are not jumpered. 9-09 9
THEMSTAT SUASE CMPENTS L (HT) L H C H/C FAN FAN ELA ELA W H H ESET E LED (ED) PWE SUPPL. PVIDE DISCNECT MEANS AND VELAD PTECTI AS EQUIED. H T "H" ELA ELA CHANEVE VALVE () CTACT C8A09 THEMIST M7A Fig.. Internal schematic and typical wiring diagram for 97 (T87889/Q7L7) and 998 (T8790/Q7L777). Exact replacement for ork model nos. TH70 and TH70. THEMSTAT SUASE CMPENTS L (HT) H H C H/C H FAN L LED (ED) W LED (N) W ELA ELA FAN ELA L CHANEVE VALVE E ELA CTACT "" ELA PWE SUPPL. PVIDE DISCNECT MEANS AND VELAD PTECTI AS EQUIED. TEMINAL LAELED C/ SME MDELS. W TEMINAL AVAILALE SME MDELS L. M8A Fig.. Internal schematic and typical wiring diagram for 9797 (T87988/Q7L88). 7 9-09 9
Mounting the Thermostat. emove the thermostat cover by pulling the bottom edge of the cover away from the base until it snaps free from the cover clip. NTE: The cover is hinged at the top and can be removed by pulling out at the bottom.. Carefully remove and discard polystyrene packing insert that protects the mercury switches during shipment.. Turn over the thermostat base and note the spring fingers that engage the subbase contacts. Make sure the spring fingers are not bent flat, preventing proper electrical contact with the subbase.. Note the two tabs on the top inside edge of the thermostat base. The tabs fit into corresponding slots on the top of the subbase. Mount the thermostat on the subbase.. Align the two captive mounting screws in the thermostat base with the posts on the subbase. See Fig.. Tighten both screws. Do not overtighten screws or damage to subbase posts can result.. Hang the upper edge of the thermostat cover on top of the thermostat base and swing cover downward until it engages with the cover clip.. Connect an ac ammeter of appropriate range between the heating terminals of the subbase: Stage : between W and.. Move the system switch to.. After one minute, read the ammeter and record the reading: Stage : amperes.. After mounting the thermostat, set the adjustable heat anticipator to match the respective reading measured in step. If equipment cycles too fast, set the anticipator to a higher current rating, not more than one-half division at a time, and recheck cycle rate. Most conventional -stage heating equipment is designed to operate at cycles per hour per stage. See Fig.. Most heat pump systems should cycle -/ to times per hour. THEMSTAT SLTS ()..0 THEMSTAT PST ()..8.. MVE INDICAT T MATCH CUENT ATIN F PIMA CTL... M8 SUASE M THEMSTAT 0 0 70 80 CAPTIVE SCEWS () Fig.. Mounting thermostat on subbase. SETTINS CAUTI n systems using a gas valve, never apply a jumper across the valve coil terminals, even temporarily. This can burn out the thermostat heat anticipator(s). Heat Anticipator Setting (nd Stage 9) Set the heat anticipator scale to match the primary control current draw. When using a T87 Thermostat with two stages of heating, set the heat anticipator to match the respective primary control current draw. If the primary control nameplate has no rating or if further adjustment is necessary, use the following procedure to determine the current draw. Measure the current draw with the thermostat removed and the power on. Fig.. Adjustable heat anticipator scale. Temperature Setting Move the setpoint lever to the desired comfort position. ne lever controls both heating and cooling. Subbase Setting System switching positions control thermostat operation as follows: : Heating and cooling systems are off. If the fan switch is at the position, the cooling fan is also off. : Heating system is controlled by the thermostat. Cooling system is off. : Cooling system is controlled by the thermostat. Heating system is off. EM.HT.: Emergency heat relay is energized on call for heat. Cooling system is off. Compressor is deenergized. Fan switching positions control fan operation as follows: : Fan operates continuously. : Fan operates as controlled by the thermostat. To switch positions, use thumb and index finger to slide lever to desired position. Stop switch lever in detent directly over the desired function indicator mark for proper circuit operation. 9-09 9 8
CHECKUT Heating Move the system switch on the Q7 Subbase to. Move the setpoint lever on the T87 Thermostat about 0 F ( C) above room temperature. oth stages of heating and the fan should start. Move the setpoint lever about 0 F ( C) below room temperature. Heating and fan should shut off. NTE: Cooling To prevent compressor short cycling, some manufacturer equipment includes a minimum-off timer to provide a five-minute time delay before turning on the compressor after the thermostat last turned off the compressor, or after the system first received power. This delay protects the compressor. CAUTI Do not operate cooling if the outdoor temperature is below 0 F (0 C). efer to manufacturer recommendations. Move the system switch on the Q7 Subbase to. Move the setpoint lever on the T87 Thermostat about 0 F ( C) below room temperature. Cooling and fan should start (see NTE above). Move the setpoint lever about 0 F ( C) above room temperature. Cooling and fan should stop. Emergency Heat Move the system switch to EM.HT. The EM.HT. LED should come on. Move the setpoint lever about 0 F ( C) above room temperature. The electric strip heater(s) should come on. Move the setpoint lever about 0 F ( C) below room temperature. The electric strip heater should de-energize. The EM.HT. LED remains on until system switch is moved to another position. CALIATI Thermostat T87 Thermostats are accurately calibrated at the factory. There is no provision for field calibration. Thermometer The thermometer in the thermostat has been accurately calibrated at the factory. The thermometer should need adjustment only if it was dropped or shifted due to mishandling. If the setpoint lever and the thermometer reading do not agree:. emove the thermostat cover by pulling out from the bottom of cover until it clears the mounting slots.. Set the thermostat cover on a table near an accurate thermometer.. Allow 0 or minutes for cover thermometer to sense area temperature; compare the readings. e careful not to touch thermometer or breathe on it.. If the readings are the same, replace cover and put the system into operation.. If the readings are different, insert a small screwdriver into the thermometer and turn it until the thermometers have the same reading. See Fig... eplace thermostat cover and put the system into operation. NTE: adiant heat from hands offsets the thermometer reading. After making each adjustment, wait 0 or minutes for the thermometer to stabilize before comparing. Fan Move the subbase system switch to and the fan switch to. The fan should run continuously. When the fan switch is in the position, fan operation is controlled by the heating or cooling system. Fig.. Thermometer calibration M070 9 9-09 9
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