Honeywell Y594G User's Manual
Contents
1. 7 On the T874R lever controls both heating and cooling SUBBASE SETTING System switching positions control thermostat oper ation as follows EM HT emergency heating system is energized Red EM HT LED on subbase is on Cooling system is off HEAT heating system is controlled by the thermo stat Cooling system is off OFF both the heating and cooling systems are off HEATING Move the system switch on the subbase to HEAT and the fan switch to AUTO Move the heating set point lever on the thermostat about 10 F 5 6 C above room temper ature Heating should start providing there is no time delay or outdoor temperature limiting system and the fan shouid run after a short delay Move the heating set point lever about 10 F 5 6 C below room temperature The heating equipment should shut off and the tan should run for a short time then shut off COOLING CAUTION Do operate cooling if outdoor temperature below 50 10 Refer to manufacturer s recom mendations SETTING 4 Note the tabs along the top inside edge of the thermostat base The tabs fit into corresponding slots on top ofthe subbase Mountthe thermostat on the subbase 5 Align the two captive mounting screws in the thermostat base with the posts on the subbase Fig 7 Tighten both screws DO NOT OVERTIGHTEN SCREWS or damage to subbase posts may result THERMOSTAT MOUNTING SLOTS THERMOSTAT MOUNT2. ING POST 2 CAPTIVE MOUNTING SCREWS Fig 7 Mounting thermostat on subbase T874R shown COOL cooling system is controlled by the thermo stat Heating system is off AUTO T874G only thermostat automatically changes between heatand cool modes depending upon the indoor temperature Fan switching positions control fan operation as follows ON fan operates continuously AUTO fan operates with equipment as controlled by the thermostat To switch positions use thumb and index finger to slide lever to desired position Switch lever must stop in detent directly over desired function indicator mark for proper circuit operation CHECKOUT Move the system switch on the subbase to COOL Move the cooling set point lever on the thermostat about 10 F 5 6 C below room temperature The cooling equipment and fan should start Move the cooling set point lever about 10 F 5 6 C above room temperature The cooling equipment and fan should stop NOTE On the T874R the same lever controls both heating and cooling FAN Move the subbase system switch to OFF and the fan switch to ON The fan should run continuously When the fan switch is in the AUTO position fan operation is controlled by the heating or cooling system CALIBRATION THERMOSTAT These thermostats are accurately calibrated at the factory THEY DO NOT HAVE PROVISION FOR FIELD CALIBRATION THERMOMETER The thermometer in your thermostat has been
3. R FAN SWITCH H2 ANTICIPATOR SYSTEM SWITCH A Q DH 4 319 oa 3 HEAT AAA COMPRESSOR 5 5 FAULT 1 lt Q coo FA I CHANGEOVER RELAY ANTICIPATOR Pa a cooL CHANGEOVER RELAY ofr COMPRESSOR CONTACTOR SI A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PRO TECTION AS REQUIRED A SELECT EITHER COOL OR HEAT CHANGEOVER C CO AND SEQUENTIALLY ON TEMP RISE 0 AND H2 MAKE SEQUENTIALLY ON TEMP FALL Fig 4 Internal schematic and typical hookup of T874G and Q674F in heat pump system 2 ANTICIPATOR gen IT FAN RELAY AAN POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED CHANGEOVER VALVE HEAT COMPRESSOR 1 CONTRACTOR 3 1 baund CHANGEOVER VALVE COOL Fig 5 Internal schematic and typical hookup of T874R and Q674L in heat pump system 4 Level the subbase using a spirit level as shown Fig 3 and firmly tighten subbase mounting screws The subbase mounting holes provide for minor out of level adjustments IMPORTANT subbase incorrectly leveled will cause the temper ature control to deviate from set point WIRING THE SUBBASE All wiring must comply with local electrical codes an
4. SUPER TRADELINE Y594G T874G Q674F THERMOSTAT SUBBASE PACKAGE OR T874R THERMOSTAT Q674L SUBBASE INSTALLATION INSTRUCTIONS FOR THE TRAINED SERVICE TECHNICIAN APPLICATION These thermostats and subbases provide 24 to 30 Vac control for two stage heating and one stage cooling heat pump systems as follows MODEL Y594G T874G Q674F T874R Q674L On a two heat thermostat the stages ot heat make sequentially as the temperature drops Make refers to the mercury switch initiating a call for heat or cool There is about 2 F 1 1 C between stages so that the second stage auxiliary heat makes only when the first stage can t handle the toad This is the interstage differential Three LEDs light emitting diodes are included on the INSTALLATION WHEN INSTALLING THIS PRODUCT 1 Read these instructions carefuily 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 service technician 4 After installation is complete check out product operation as provided in these instructions CAUTION Disconnect power supply to prevent electrical shock or equipment damage Run wires as close to the subbase as possible To prevent interference with the thermostat linkage keep wire length to
5. a minimum Push excess wire back into the hole and plug hole to prevent drafts from affecting thermostat operation Do not overtighten thermostat captive mounting screws as damage to subbase threads may result Do not short across terminals on relay This may burn out the heat anticipator LOCATION nstall the thermostat about 5 1 5 m above the floor in an area with good circulation at average temperature Do not install the thermostat where it may 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 behind the ther mostat such as an outside wall CHANGEOVER SYSTEM SWITCHING Automatic Heat or Cool OFF EM HT HEAT AUTO COOL Ll EMHT HEAT OFF 000L OPERATION FAN SWITCHING AUTO ON AUTO ON subbase The red CHECK LED lights when something needs to be checked or done to maintain efficient operation of the system See your heating system instructions to find out specifically what the CHECK LED signifies The green LED lights when the AUX HT stage second stage heat is operating The red EM HT LED lights when the EM HT relay is energized usually operating electric strip heaters MOUNTING THE SUBBASE The thermostat subbase can be mounted on a vertical outlet box horizontal outlet box or directly on the wall 1 If y
6. ac curately calibrated at the factory The thermometer should only need adjustment if it has been dropped or shifted due to mishandling If set point lever and the thermometer reading do not agree follow the procedure below 1 Remove thermostat cover by pulling up from the bottom of cover until it clears the retaining posts 2 Set the cover on a table near an accurate ther mometer 3 After allowing 5 or 10 minutes for stabilization compare the readings If they are the same replace cover and put system into operation If they are different recalibrate the thermostat thermometer step 4 4 Insert a small screwdriver in the thermometer shaft Fig 8 and turn it until the thermometers read the same When the thermometer calibrated replace cover and place system into operation NOTE Hand heat will offset the thermometer reading After making each adjustment wait 5 or 10 minutes for the thermometer to stabilize before comparing Fig 8 Thermometer calibration Honeywell Inc International Sales Offices in all principal cities ofthe world Manufacturing in Australia Canada Finland 1885 Douglas Drive N France Germany Japan Mexico Netherlands Spain Taiwan United Kingdom U S A Golden Valley MN 55422 4386 PRINTED IN U S A
7. d ordinances Follow equipment manufacturers wiring instructions when available To wire subbase proceed as follows 1 Connect system wires to the subbase as shown in Fig 4 or 5 Aletter code is near each terminal for identifica tion The terminal barrier permits straight or conventional wraparound wiring connection Fig 6 69 0272 1 2 Firmly tighten each terminal screw 3 Fitwires as close to the subbase as possible Push excess wire back into hole 4 Plug hole with nonflammable insulation to prevent drafts from affecting the thermostat FOR STRAIGHT INSERTION STRIP 5 16 in 8 mm FOR WRAPAROUND STRIP 7 16 in 11 mm TERMINAL SCREW 10 310C Fig 6 Wiring connections MOUNTING THE THERMOSTAT 1 Remove the thermostat cover by pulling the bottom edge of the cover upward until it snaps free of the retaining posts NOTE The cover is hinged at the top and must be removed by pulling up at the bottom 2 Carefully remove and discard the polystyrene packing insert which protects the mercury switches during shipment 3 Turn the thermostat base over and note the spring fingers which engage the subbase contacts Make sure the spring fingers are NOT bent flat preventing proper electrical contact with the subbase TEMPERATURE SETTING On the T874G move the heating and cooling set point levers to the desired positions The minimum differential between heating and cooling set points is 3 F 1
8. ou must mount the subbase a vertical outlet box order 193121A Adapter Assembly Fig 1 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 VERTICAL BOX IN NOT INCLUDED WITH UNIT A ACCESSORY PARTS AVAILABLE 1931214 Fig 1 installation of subbase on outlet box S M Rev 5 86 Form Number 69 0272 1 Honeywell Inc 1986 For a wall installation hold subbase in position and 2 Pull wires through the cover plate if used and mark holes for anchors Fig 2 Wall anchors must be subbase cable opening Fig 3 obtained from local hardware store Take care that the 3 Secure the cover plate if used and subbase with wires not fall back into the wall opening Set subbase the screws provided Do not fully tighten the subbase aside Drill four 3 16 in 4 8 mm holes and gently tap screws anchors into the holes until flush with the wall WIRING THERMOSTAT TERMINAL CABLE OPENING WIRES THROUGH WALL OPENING WALL ANCHORS 1 N suesase U 2 5717 0 SPRING FINGER MOUNTING HOLE 4 POST 2 FOR CONTACTS ON THE MOUNTING THERMOSTAT THERMOSTAT UP TO 12 MOUNTING SCREWS 2 11 212 Fig 2 Installation of subbase on wall Fig 3 Subbase components and leveling procedure ANTICIPATO
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