Honeywell Q674J User's Manual
Contents
1. EHT1 ANTICIPATOR LACO CHP COMPRESSOR CONTACTOR Fo RISE A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED 1592 Fig 9 Internal schematic and typical wiring diagram for T874D1165 T874E1016 Q674F1543 Exact replacement for York model no 2TB04700524 THERMOSTAT SUBBASE SYSTEM COMPONENTS ul HEAT RELAY 1 wr wi FAN YS En M A SWITCH HEAT RELAY 2 AUTO E D H1 ANTICIPATOR oN 34 o T O LED x A RED H2 q H2 N EM HEAT RELAY FALL ANTICIPATOR pe SYSTEM E SWITCH Q Q FAN RELAY OFF e 42 PN Ci 5 4 S 4 RISE HT 42 O 5 COMPRESSOR t OT HEAT C 4 CONTACTOR 2 ue er 10 COMPRESSOR C1 ANTICIPATOR cooLt CONTACTOR 1 6 0 5 1 C2 ANTICIPATOR 3 PN c2 RISE POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED LED IS NOT LABELED JUMPER W2 TO X FOR AUXILIARY HEAT INDICATION JUMPER TO X FOR EMERGENCY HEAT INDICATION CONNECT SYSTEM MONITOR TO X TO IDENTIFY WHEN SYSTEM M2982A NEEDS TO BE CHECKED 69 0435 10 6 Fig 10 Internal schematic and typical wiring diagram for Y594G1567 T874G1865 Q674J1209 and Y594G1575 T874G1873 Q674J1225 auto changeover in cooling Exact replacement for York model nos 2TH11702424 and 6TH11702424 THERMOSTAT SUBBASE SYSTEM COM2. 6TH11702424 Y594G1575 EM HT AUTO AUTO TRADELINE exact AUTO OFF O COOL replacement for York mo nos 2TH11702424 and 6TH11702424 Y594G1633 T874G1972 OFF EM HT AUTO AUTO TRADELINE Q674F1584 HEAT AUTO ON HEAT OR COOL COOL 7 Y594G1526 OFF EM HT AUTO AUTO TRADELINE HEAT AUTO N HEAT COOL i H 10 N 10 N a EM HT also shows compressor malfunction P When switch is in EM HT position the emergency heat will operate continuously until system switch is moved to another position Thermostat is white and subbase is gray Sold only in Australia degrees C LED indicator is not labeled but may be connected per user s requirements See Fig 9 J H Rev 7 94 OHoneywell Inc 1994 Form Number 69 0435 10 Operation On a 2 stage heating 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 are about 2 F 1 C between stages so the sec ond stage makes only when the first stage cannot handle the load This 2 F 1 C is referred to as the interstage differential The LED indicators are light emitting diodes on the subbase that light up when something specific happens within the system When an LED lights up refer to the following list for the meaning EM HT Emergency heat is operating which means the system switch is at EM HT AUX HT Auxiliary
3. heat is operating which means the weather is so cold that the heat pump can not handle the load alone CHECK System needs to be checked See Heating Cooling System Instructions for specific meaning LEDs are not field replaceable or addable Recycling Notice This control contains mercury in a sealed tube Do not place control in the trash at the end of its useful life Tf this control is replacing a control that contains mercury 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 Installation WHEN INSTALLING THIS PRODUCT 1 Read these instructions carefully Failure to follow them could 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 l Disconnect power supply to prevent electri cal shock or equipment damage 2 To prevent interference with the thermostat linkage keep wire length to a minimum and run wires as close as possible to the subbase 3 Do not overtighten thermostat captive mount ing screws because damage to subbase threads can result
4. 4 Do not short across coil terminals on relay This may burn out the thermostat heat anticipator 5 Never install more than one wire per termi nal unless factory supplied jumper with spade terminal is used 69 0435 10 IMPORTANT Thermostats are calibrated at the factory by using subbases mounted at true level Inaccurate sub base leveling will cause thermostat control deviation LOCATION Install the thermostat about 5 ft 1 5 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 cor ners 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 1 If you must mount the subbase on a vertical outlet box order 193121A beige or 202689A gray Adapter Assembly See 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 For a wall installation hold subbase in position and mark holes for anchors See Fig 2 Obtain wall anchors locally Set subbase aside Drill four 3 16 in 5 mm holes and gently tap anchors into the holes until flush with the wa
5. AT T874 Thermostats are accurately calibrated at the factory They do not have provision for field calibration THERMOMETER 1 Remove thermostat cover by pulling the bottom edge of the cover away from the base until it snaps free from the retaining posts 2 Set the cover on a table near an accurate thermometer 3 After allowing 10 or 15 minutes for stabilization compare the readings If they are the same replace the cover and put the system into operation If they are different recalibrate the thermostat thermometer step 4 4 Insert a small screwdriver in the thermometer shaft Fig 13 and turn it until the thermometers read the same When the thermometer is calibrated replace the cover and place the system into operation NOTE Hand heat will offset the thermometer reading After making each adjustment wait 10 or 15 minutes for the thermometer to stabilize before comparing Fig 13 Thermometer calibration 5 M5070 69 0435 10 69 0435 10 10 11 69 0435 10 Honeywell Home and Building Control Home and Building Control Honeywell Honeywell Limited Honeywell Limit e 1985 Douglas Drive North 35 Dynamic Drive Golden Valley Minnesota 55422 Scarborough Ontario MIV 4Z9 69 0435 10 Printed in U S A
6. G HOLES 2 MOUNTING SPRING FINGER CONTACTS ON THE THERMOSTAT THERMOSTAT UP TO 12 M927 POST 2 FOR Fig 4 Wiring Connections FOR STRAIGHT INSERTION STRIP 5 16 in 8 mm FOR WRAPAROUND STRIP 7 16 in 11 mm BARRIER SUBBASE TERMINAL SCREW M928 1 Connect the system wires to the subbase as shown in Figs 5 11 A letter code located near each terminal is for identification The terminal barrier permits straight or conventional wraparound wiring connection See Fig 4 2 Firmly tighten each terminal screw 3 Fit wires as close as possible to the subbase Push excess wire back into the hole 4 Plug hole with nonflammable insulation to pre vent drafts from affecting the thermostat 69 0435 10 Fig 5 Internal schematic and typical wiring diagram for Y594G1252 T874G1246 Q674F 1212 auto changeover in cooling THERMOSTAT don Hi FALL H2 US JN FALL CHP SUBBASE SYSTEM COMPONENTS H1 ANTICIPATOR RTD FAN SWITCH AUTO A ON HA o 06 3 ra ANTICIPATOR AUX HEAT 4 OFF Or 4 HA SYSTEM COOL amp yA amp METE EM HEAT HO FAN AUTO Fk 4 YA LED RED RELAY i M RD COOL EME FA pe d Toe CHANGEOVER VALVE 5 O EM HEAT RELAY EE COMPRESSOR CONTACTOR A POWER SUPPLY PROVIDE DISCONNECT MEANS A
7. Honeywell TRADELINE T874G Thermostats and Q674F J Subbases for Heat Pump Systems Installation Instructions for the Trained Service Technician Application The T874G Thermostats and Q674F J Subbases pro heat and cool anticipation is fixed voltage type stage 2 heat vide 24 to 30 Vac control of 2 stage heating and 1 stage cool anticipation is adjustable except as noted See Table 1 for ing heat pump systems with automatic changeover Stage 1 specific T874G Q674F J combinations and specifications TABLE 1 THERMOSTAT SUBBASE SPECIFICATIONS Thermostat Thermostat Subbase Subbase Model LED Switching See Package Numbers Indication Changeover Comments Fig Y594G1252 EM HT OFF AUTO AUTO TRADELINE HEAT AUTO ON COOL COOL EM HT gt OFF AUTO AUTO Separate W1 and Y1 HEAT AUTO O COOL terminals TRADELINE COOL subbase Y594G1419 OFF EM HT AUTO AUTO SUPER TRADELINE HEAT AUTO HEAT includes factory installed COOL COOL jumper across W1 and Y1 fixed stage 2 heat anticipation O includes jumper for connecting X2 terminal to X or R for Y594G1476 Isolated CHECK LED Y594G15344 T874G1824 Q674F1477 power RED OFF EM HT AUTO AUTO TRADELINE subbase exact HEAT AUTO O replacement for York model COOL no 2TB04700524 Thermostat not included order separately Y594G1567 EM HT AUTO AUTO TRADELINE exact AUTO OFF O COOL replacement for York mo nos 2TH11702424 and
8. ND OVERLOAD PROTECTION AS REQUIRED A W3 TERMINAL ON SELECT MODELS oo ES M1589 Fig 6 Internal schematic and typical wiring diagram for T874G1246 Q674F1410 Separate W1 and Y1 terminals can be jumpered together to form Y terminal H2 iii e FALL THERMOSTAT SUBBASE SYSTEM COMPONENTS ex N T W1 RELAY W3 RELAY O E MA RELAY H1 ANTICIPATOR FAN SWITCH EM 3 FAN RELAY AUTO mu oo ON FH 5 5 R E AUX HEAT RELAY L2 m A 5 SYSTEM uo 1 SWITOH Q AUX HEAT OFF FA HH LED GREEN EM HT 4 F4 Q x 7 EM HT O AUTO LED RED COOL COMPRESSOR C1 ANTICIPATOR Cr aed B9 FAULT pm COOL CHANGEOVER EM HT VALVE RELAY COMPRESSOR CONTACTOR A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A ON SOME MODELS Y TERMINAL MAY BE LABELED Y1 A EMERGENCY HEAT RUNS CONTINUOUSLY WHEN SWITCH IN IN EM HT POSITION 69 0435 10 0 A O Ev M5987A Fig 7 Internal schematic and typical wiring diagram for Y594G1419 T874G1642 Q674F 1444 Y594G1476 T874G1741 0674F1477 and Y594G1534 T874G1824 Q674F1477 sold only in Australia auto changeover in heating and cooling fixed anticipation CHECK LED has isolated terminals Factory installed W1 Y1 jumper is equivalent to Y t
9. PONENTS H1 ANTICIPATOR H2 ANTICIPATOR O Ea COOL CHANGEOVER VALVE ES SYSTEM SWITCH EM HEAT CH LED RED AUX HEAT RELAY EM HEAT RELAY COMPRESSOR CONTACTOR E A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED M5723 Fig 11 Internal schematic and typical wiring diagram for Y594G1633 T874G1972 Q674F1584 auto changeover in heating and cooling THERMOSTAT SUBBASE SYSTEM COMPONENTS FALL FAN SWITCH H1 ANTICIPATOR Q COOL CHANGEOVER AN VALVE Ev ON HA B RELAY FAN RELAY SYSTEM SWITCH ORO El EM HT LED RED AUX HEAT LED GREEN EM HT RELAY AUX HEAT RELAY POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED COMPRESSOR CONTACTOR M5986 L1 HOT L2 69 0435 10 MOUNTING THE THERMOSTAT 1 Remove the thermostat cover by pulling the bot tom edge of the cover away from the base until it snaps free of the retaining posts NOTE The cover is hinged at the top and must be removed by pulling out at the bottom 2 Carefully remove and discard the foam packing in sert that protects the mercury switches during shipment 3 If thermostat is being used with a Q674 Subbase that has LED in
10. cipation set each ad justable anticipator to match the primary control current draw If the primary control nameplate has no rating or if further adjustment is necessary use the following proce dure to determine the current draw for each stage 69 0435 10 The current draw must be measured with the thermo stat removed and the power on Do not short across primary control terminals This may burn out the heat anticipator 1 Connect an ac ammeter of appropriate range be tween the heating terminals of the subbase as follows Stage 1 between W1 and RH or R Stage 2 between W2 and RH or 2 Move the system switch to HEAT or AUTO and set the temperature to call for heat 3 After one minute read the ammeter and record the reading 4 After mounting the thermostat set the adjustable heat anticipator to match the readings measured in step 3 TEMPERATURE SETTING Move the heating and the cooling levers to the desired positions The minimum differential between heating and cooling set points is 4 or 6 F 2 or 3 C depending on model the setting levers are designed so they cannot be set closer together than 4 or 6 F 2 or 3 C depending on the model SUBBASE SETTING N CAUTION The Q647F1410 will run the EM HT relay constantly when the system is in the EM HT position A cycling stat or limit must be pro vided external to the T874 to control the EM HT relay System switching positions contr
11. dication and the thermostat set point scale does not have preprinted designations EM HT CHECK etc install the desired preprinted insert packed with the subbase Push both thermostat set point levers to the far ends of the thermostat Use index finger to gently pull out the set point scale a fraction of an inch Insert the desired preprinted insert into the recessed area behind the set point scale Make sure insert is completely seated in recessed area and reposi tion set point levers to the desired positions 4 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 elec trical contact with the subbase 5 Set any adjustable heat anticipator indicators to the respective current setting of each stage See Setting the Heat Anticipator section 6 Note the tabs along the top inside edge of the thermostat base The tabs fit into the subbase notches Mount the thermostat base on the subbase and tighten the captive mounting screws See Fig 12 7 Place the upper edge of the thermostat cover on the thermostat base and swing the cover downward until it engages with the retaining posts on the base Fig 12 Mounting thermostat on subbase THERMOSTAT MOUNTING SLOTS 2 THERMOSTAT MOUNTING POST 2 THERMOSTAT I A MOUNTING Mess SCREWS 2 Setting SETTING THE HEAT ANTICIPATOR On models with adjustable anti
12. erminal THERMOSTAT SUBBASE SYSTEM COMPONENTS FAN A O SWITCH MW3RELAY L1 12 CHANGEOVER S EA HOT HEAT AUTO FAN RELAY AN CF 4 FALL m ON gogo Y ANTICIPATOR t 8 Iw FN ES AUX HEAT RELAY AUX COMPRESSOR Hi AN Ey HT LED FAULT FALL GREEN 4 u CHECK CHANGEOVER LED RED COOL Q COOL Ep 4 PN COOL CHANGEOVER RELAY HEAT CHANGEOVER W1 RELAY RELAY JA COMPRESSOR CONTACTOR A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A W1 Y1 JUMPER IS Y TERMINAL REMOVE JUMPER WHEN W1 RELAY IS USED M1230A 5 69 0435 10 Fig 8 Internal schematic and typical wiring diagram for Y594G1526 T874G1626 Q674F 1436 auto changeover in heating THERMOSTAT SUBBASE SYSTEM COMPONENTS HOT 12 H1 ANTICIPATOR AN FALL 2 T RTD 1 Ht Mm FAN SWITCH 32 AUTO 2 ON Fd 7 ANTICIPATOR 6 0 5 10 1 69 AUX HEAT LED GREEN t IN x SYSTEM mm nd SWITCH GIA nen COMPRESSOR LED RED CQUURE m io E A D EM HT C 4 4 FALL HEAT FU Ect FAN RELAY CHANGEOVER AUTO Q HEAT 8 COOL _F 4 CHANGEOVER gt gt VALVE EM HT 9 RELAY Fre
13. ll 2 Run wires to the thermostat location See wiring diagrams Figs 5 11 Fig 1 Installation of Q674 Subbase on outlet box ADAPTER MOUNTING SCREWS 2 MOUNTING SUBBASE SCREWS 2 Anor INCLUDED WITH UNIT A accessory PARTS AVAILABLE 1931214 M925 Fig 2 Installation of Q674 Subbase on wall WIRES THROUGH WALL OPENING WALL Rp ANCHORS 2 SS IOUNTING P N HOLES N suBBASE b IOUNTING M926 SCREWS 2 IMPORTANT Use 18 gauge color coded thermostat cable for proper wiring 3 Pull wires through the cover plate if used and sub base cable opening See Fig 3 Take care that wires do not fall back into the wall opening 4 Secure the cover plate if used and subbase with the screws provided Do not fully tighten the subbase screws 5 Levelthe subbase using a spirit level as shown in Fig 3 and firmly tighten subbase mounting screws The subbase mounting holes provide for minor out of level adjustments IMPORTANT An incorrectly leveled subbase will cause the temperature control to deviate from set point WIRING THE SUBBASE All wiring must comply with local electrical codes and ordinances Follow equipment manufacturer wiring instruc tions when available To wire subbase proceed as follows Fig 3 Subbase components and leveling procedure MOUNTING HOLES 2 WIRING TERMINAL THERMOSTAT CABLE OPENING SPIRIT LEVEL MOUNTIN
14. ol thermostat op eration as follows OFF Both the heating and cooling systems are off HEAT Heating system is controlled by the thermo stat Cooling system is off COOL The cooling system is controlled by the thermostat Heating system is off EM HT Emergency heat relay is energized The cool ing system is off When the heat pump is inoperable switch to EM HT setting The Q674F 1410 Subbase will run EM HT relay continuously until the switch position is changed All other subbases will cycle the EM HT relay according to room temperature via the T874 mercury switch AUTO Thermostat automatically changes between heat and cool modes depending on the indoor temperature Fan switching positions control fan operation as follows ON Fan operates continuously AUTO Fan operates with heating or cooling equip ment as controlled by the thermostat To switch positions use thumb or index finger to slide the lever to the desired position Switch lever must stop in detent over the desired function indicator mark for proper circuit operation Checkout HEATING Move the system switch on the Q674 Subbase to HEAT Move the heating set point lever on the T874 Thermostat about 10 F 6 C above room tempera ture Both stages of heating and fan should start Move the set point lever about 10 F 6 C below room temperature Heating and fan should shut off NOTE To prevent compressor short cycling a minimum off timer ma
15. y be included to provide a five minute time delay before turning on the compressor after the thermo stat last turned off the compressor or after the system first received power This delay protects the compressor COOLING CAUTION Do not operate cooling if the outdoor tempera ture is below 50 F 10 C Refer to manufac turer recommendations Move the system switch on the Q674 Subbase to COOL Move the cooling set point lever on the T874 Thermostat about 10 F 6 C below room tempera ture Cooling and fan should start see CAUTION Move the cooling set point lever about 10 F 6 C above room temperature Cooling and fan should stop EMERGENCY HEAT Change the system switch to EM HT The EM HT LED will come on The Q674F1410 Subbase starts the electric strip heater s when put in the EM HT position see CAUTION in Subbase Setting section All other subbases will be tested by moving the set point lever about 10 F 6 C above room temperature The electric strip heater s will come on Reset the set point lever about 10 F 6 C below room temperature The electric strip heater will de energize The EM HT LED remains on until the system switch is moved to another position 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 the fan operates with the heating or cooling equipment Calibration THERMOST
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