Honeywell TROL-A-TEMP Q674B User's Manual
Contents
1. Fig 3 Subbase components and leveling procedure THERMOSTAT CABLE OPENING TOP WIRING MOUNTING TERMINAL SPIRIT LEVEL HOLES 2 D ul CS a m q ul OG JO MOUNTING POST 2 FOR LTO SPRING FINGER HOLES 2 MOUNTING CONTACTS ON THE THERMOSTAT THERMOSTAT UP TO 12 M927 4 Level the subbase using a spirit level as shown in Fig 3 and firmly tighten the subbase mounting screws The subbase mounting holes allow 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 in structions when available To wire subbase 1 Connect wires to the subbase terminals Refer to Figs 6 10 for wiring diagrams of typical zone systems A letter code is located near each subbase terminal for identi fication The terminal barrier permits straight or conven tional wraparound wiring connection Fig 4 2 Some Q674 Subbases have RC and RH terminals for isolated heating and cooling transformers For zoning systems jumper RC and RH terminals as shown in Fig 5 and wire as single R terminal 3 Firmly tighten each terminal screw 4 Fit wires as close as possible to the subbase Push excess wire back into hole 5 Plug the hole with nonflammable in2. CAUTION Do not operate cooling equipment if outdoor temperature is below 50 F 10 C Refer to manufacturer recommendations Make sure all zone thermostats are set as instructed in the Cooling column in Table 5 Check each zone thermo stat as follows 1 Move cooling set point lever on the zone thermostat 10 F 6 C below room temperature to call for cooling 2 After 30 seconds place your hand in front of an air register in that zone to check for cool air at the register 3 Move the cooling set point lever on the zone thermo stat 10 F 6 C above room temperature to end the call for cooling After 30 seconds longer if necessary for time delay on control panel check that air flow at the register has stopped 4 Repeat steps 1 3 for each zone thermostat When system checkout is complete return all thermo stats to the desired settings for normal system operation 69 0580 2 Calibration Fig 14 Thermometer calibration THERMOSTAT T874 thermostats are accurately calibrated at the factory They do not have provision for field calibration THERMOMETER The thermometer in your thermostat has been accu rately calibrated at the factory The thermometer should only need adjustment if it has been dropped or shifted due to mishandling If the set point lever and the thermometer reading do not agree N 1 Remove the thermostat cover by pulling up from the d bottom of cover until it clears the mounting slo
3. 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 If you have questions call Honeywell at 1 800 468 1502 S M Rev 6 93 OHoneywell Inc 1993 Form Number 69 0580 2 Installation WHEN INSTALLING THIS PRODUCT 1 Read these instructions carefully Failure to fol low them could damage the product or cause a hazard ous 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 IN CAUTION 1 Disconnect power supply to prevent electrical 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 Do not short across terminals of systems con trols This can burn out the thermostat heat anticipator IMPORTANT Thermostats are calibrated at the factory by using subbases mounted at true level Inaccurate sub base leveling will cause thermostat control deviation LOCATION Locate the subbase about 5 ft 1 5 m above the flo
4. E 1 ZONE 2 RELAY RELAY CHANGEOVER CONTROL HEATING COOLING EQUIPMENT DAMPER ACTUATOR DAMPER ACTUATOR DAMPER ACTUATOR A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A JUMPER RC RH TOGETHER AND WIRE AS SINGLE R TERMINAL A ZONE 1 AND B TERMINALS MUST BE CONNECTED FOR PROPER SYSTEM OPERATION A DO NOT CONNECT W2 AND Y2 TERMINALS TO CONTROL PANEL M1634 Fig 8 Typical hookup for MABS and MABS II L Control Panels with T874D Thermostat Q674B D Subbases in multistage heating cooling zone system MABS II Control Panel shown MABS II L Control Panel hookup is the same T874D THERMOSTAT T874D THERMOSTAT T874D THERMOSTAT Q674B SUBBASE Q674D SUBBASE Q674D SUBBASE MO HOO 69 02 MOO OW MABS CONTROL PANEL HEAT SECOND FAN HEAT COOL ZONE 1 ZONE 2 RELAY STAGE RELAY RELAY RELAY RELAY RELAY RELAY CHANGEOVER TO SINGLE CONTROL STAGE HEATING COOLING EQUIPMENT ADD A ZONE 24 V 40 VA amp 9 6 9O0OQG eeoeoeoogpegg TRANSFORMER amp GGG GGG GIz DAMPER DAMPER DAMPER ACTUATOR ACTUATOR ACTUATOR A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A JUMPER RC R
5. H TOGETHER AND WIRE AS SINGLE R TERMINAL A ZONE 1 O AND B TERMINALS MUST BE CONNECTED FOR PROPER SYSTEM OPERATION A IF SINGLE STAGE COOLING DO NOT CONNECT Y2 IF SINGLE STAGE HEATING DO NOT CONNECT W2 M1393A 5 69 0580 2 Fig 9 Typical hookup for MABS XX Control Panel with T874A Thermostat Q674B E Subbases in single stage heating cooling zone system MABS XX CONTROL PANEL ZONE 1 ZONE2 ZONE 3 HEAT FAN COOL HEAT FAN COOL HEAT FAN COOL ES os ABER ETE SH 1 ZONE 1 ZONE2 ZONE 3 FAN FAN FAN ZONE SYS ZONE SYS ZONE SYS DAMPER DAMPER DAMPER TO SINGLE STAGE HEATING COOLING EQUIPMENT Coy GG GG G RG orem orew J O000 09000 DAMPER DAMPER DAMPER ACTUATOR ACTUATOR ACTUATOR 874 874A 874 THERMOSTAT THERMOSTAT Q674B ORE Q674B OR E Q674B OR E SUBBASE SUBBASE SUBBASE 1 POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED WIRE ONLY THE TERMINAL CONNECTIONS SHOWN SOME TERMINALS NOT AVAILABLE ON ALL THERMOSTATS IF THERMOSTAT HAS R RC RH TERMINALS JUMPER TOGETHER AND WIRE AS SINGLE R TERMINAL DO NOT CONNECT THERMOSTAT O AND B TERMINALS TO CONTROL PANEL pet ermostat Q674B E Subbases in Fig 10 Typical hookup
6. Honeywell TROL A TEMP T874A D Zone Thermostats Q674B D E Subbases Installation Instructions for the Trained Service Technician Application These T874A D Zone Thermostats and Q674B D E Subbases provide 24 to 30 Vac temperature control in Honeywell Trol A Temp heating cooling zone systems See Table 1 for thermostat subbase and system compatibil ity see Table 2 for thermostat specifications For complete Honeywell Trol A Temp System specification and appli cation information refer to the system specification in cluded with the control panel TABLE 1 THERMOSTAT SUBBASE AND SYSTEM COMPATIBILITY Thermostat Application Subbase Model Number Mini Zone Mabs Mabs II L Mabs XX Stages T874A Q674B Zone 1 conventional Zone 1 conventional Any zone conventional heat cool Single stage heat cool heat cool T874A Q674D Zones other than zone 1 Zones other than zone 1 Not applicable Single stage conventional heat cool conventional heat cool T874A Q674E Not applicable Not applicable Any zone conventional heat cool Single stage T874D Q674B Not applicable Zone 1 conventional Any zone conventional heat cool Multistage heat cool T874D Q674D Not applicable Zones other than zone 1 Not applicable Multistage conventional heat cool and heat pump T874D Q674E Not applicable Not applicable Any zone conventional heat cool Multistage Subbase not included wit
7. POSITIONS Switching Mini Zone Mabs II Position Mabs I L System Mabs XX System OFF Both heating and Zone thermostat cooling systems will not call for are off If the fan is heating or cooling at AUTO position the cooling fan is also off HEAT System operates Zone thermostat in heating mode calls for heating Cooling is off only COOL System operates Zone thermostat in cooling mode calls for cooling Heating is off only AUTO Not applicable Zone thermostat calls for heating or cooling depending upon indoor temperature Fig 13 Location of external components HEATING SET POINT LEVER NG y THERMOMETER COOLING SET POINT eevee SYSTEM SWITCH A SUBBASE SWITCHING NOT AVAILABLE ON 06240 A HEAT OFF COOL AUTO SYSTEM SWITCHING ON Q674E 12 9904 TABLE 4 SUBBASE FAN SWITCHING POSITIONS Switching Mini Zone Mabs II Position Mabs I L System Mabs XX System ON Fan operates continuously With any zone set to ON fan will operate continuously AUTO In cooling fan operates with cooling If all zones set to AUTO the fan operates as controlled equipment in heating fan operates as controlled by the plenum fan control by the plenum fan control in heating and with cooling equipment in cooling If any zone is set to ON the fan will operate continuously To move the subbase switches to the desired contro positions use thumb and
8. for MABS XX Control Panel with T874D Th multistage heating cooling zone system EM 103NNOO LON OO SOVLS SIONIS 41 2 103NNOO LON OO 002 39v1S 315NIS 3l V TAN d 30B1NO2 OL S IVNIAH31 B ONY LV1SOWHSHL 193NNOO LON Od VNIWEAL TIONIS SY JHA ONY H3HL3901 HAGANI E IVNIAH3IL HY ONY SVH 1V1SOWH3HL di SIYLSOWH3H TY NO 3 8V IIVAY LON S IYNINHSI 3WOS NMOHS SNOLLO3NNOO IYNIWYIL IHL AINO 38M v SY QVOTH3AO ONY SNY3K LO3NNODSIA BOIAOUd ATladfiS H390d WV WE 3sveans 87 90 ALWLSOWH3HL BOOS 3NOZ y Q v amp a 5 XX SQvA FOVLSILLINN OL 69 0580 2 Fig 11 Heat anticipator scales T874D shown Fig 12 Mounting thermostat on subbase T874D shown THERMOSTAT MOUNTING SLOTS 2 THERMOSTAT MOUNTING POST 2 SUBBASE S5 CAPTIVE MOUNTING SCREWS 2 THERMOSTAT Settings TEMPERATURE SETTING Move the heating and cooling set point levers Fig 13 to the desired comfort positions One lever controls all stages of heating and the other lever controls all stages of cooling The minimum differential between heating and cooling set point is 3 F 2 C SUBBASE SETTING Q674B AND E ONLY Refer to Tables 3 and 4 for descriptions of subbase switching positions TABLE 3 SUBBASE SYSTEM SWITCHING
9. from the base until it snaps free from the cover clip NOTE The cover is hinged at the top and is removed by pulling out at the bottom 2 Carefully remove and discard the polystyrene packing insert that protects the mercury switches during shipment 3 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 electri cal contact with the subbase 4 Set the heat anticipator indicator s to 0 1 for proper system operation Fig 11 5 Note the two tabs on the top inside edge of the thermostat base The tabs fit into the corresponding slots on the top of the subbase Mount the thermostat on the subbase See Fig 12 6 Alignthe two captive mounting screws in the thermo stat base with the posts on the subbase Fig 12 Tighten both screws Do not overtighten the screws or damage to the subbase posts can result Fig 7 Typical hookup for II L Control Panels with T874A Thermostat Q674B D Subbases in single stage heating cooling zone system MABS II Control Panel shown MABS II L Control Panel hookup is the same T874A THERMOSTAT Q674B SUBBASE A A 9 9 5 9 69 69 9 2 69 T874A THERMOSTAT T874A THERMOSTAT Q674D SUBBASE Q674D SUBBASE BOM 9 OL 69 69 69 9 MABS CONTROL PANEL HEAT SECOND FAN COOL RELAY STAGE RELAY RELAY RELAY RELAY ZON
10. h thermostat order separately TABLE 2 THERMOSTAT SUBBASE SPECIFICATIONS Thermostat Anticipator Range A Thermostat Subbase Switching Subbase Heating Cooling Order Number System Fan Color Adj Fixed 874 1465 0674 1471 HEAT OFF COOL ON AUTO White Gray Stg 1 Stg 1 87441465 06740 1123 None White Gray 0 1 to 1 2 0 to 1 5 T874A 1465 Q674E1379 HEAT OFF COOL AUTO ON AUTO White Gray T874D1801 Q674B 1463 HEAT OFF COOL ON AUTO Beige Brown Stg I Stg 1 T874D1827 Q674B1471 HEAT OFF COOL ON AUTO White Gray 0 1 to 1 2 to 1 2 T874D1801 Q674D1115 None None Beige Brown Stg 2 Stg 2 T874D1827 Q674D1123 None None White Gray 0 1 to 1 0 0 to 1 0 T874D1827 Q674E1379 HEAT OFF COOL AUTO ON AUTO White Gray Subbase not included with thermostat order separately Operation On a 2 heat thermostat the two stages of heat make Recycling Notice This control contains mercury in a sealed tube Do not 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 that the second stage makes only when the first stage cannot handle the load This is the interstage differential place control in the trash at the end of its useful life Ifthis control is replacing a control that contains mercury in a sealed tube do not place your old control in the
11. index finger to slide the lever Stop the lever over the desired function indicator position for proper circuit operation Before beginning checkout of thermostat operation set switches on the control panel for the desired system operation See instructions provided with the control panel Checkout To set up the system for thermostat checkout adjust each thermostat settings as shown in Table 5 TABLE 5 SYSTEM SET UP FOR THERMOSTAT CHECKOUT Heating Cooling Control Zones Other Zones Other Panel Zone 1 Than Zone 1 Zone 1 Than Zone 1 Mini zone Set thermostat Move the heating set Set thermostat Move the cooling set MABS II system switch to point lever 10 F system switch to point lever 10 F MABS II L HEAT set fan switch 6 C below room COOL set fan 6 C above room to AUTO Move the temperature switch to AUTO temperature heating set point Move the cooling lever 10 F 6 C set point lever 10 F below room 6 C above room temperature temperature MABS XX On all zone thermostats set the system On all zone thermostats set the system switch to HEAT set the fan switch to AUTO switch to COOL set the fan switch to AUTO Move the heating set point lever 10 F 6 C Move the cooling set point lever 10 F 6 C below room temperature above room temperature NOTE The control panel provides a three NOTE The control panel provides a three minute time delay when 24V is applied to minute time de
12. lay when 24V is applied to the control panel and at the end of each the control panel and at the end of each equipment cycle The high speed fan runs equipment cycle The high speed fan runs during this time delay during this time delay HEATING COOLING NOTE If a plenum fan control is used in the heating system there will be a short delay on a call for heat to allow the furnace to heat the plenum The fan starts immediately in electric heat systems Allow 30 seconds for the damper to open or close completely Make sure all zone thermostats are set as instructed in the Heating column in Table 5 Check each zone thermo stat as follows 1 If thermostat has a fan switch set it to ON See Fig 13 After 30 seconds place your hand in front of an air register in that zone to check for air flow at the register 2 Reset fan switch if provided to AUTO After 30 sec onds make sure air flow at register has stopped 3 Move heating set point lever on zone thermostat 10 F 6 C above room temperature to call for heat 4 After 30 seconds longer if necessary for time delay on plenum fan control check for warm air at the register 5 Move heating set point lever on the zone thermostat 10 F 6 C below room temperature to end a call for heat After 30 seconds longer if necessary for time delay on plenum fan control or control panel check that air flow at the register has stopped 6 Repeat steps 1 5 for each zone thermostat
13. or in an area with good air circulation at average temperature Do not mount the subbase where the thermostat may be affected by drafts or dead spots behind doors and in corners hot or cold air from ducts radiant heat from sun appliances or fireplace 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 horizontal outlet box or directly on the wall 1 To mount on a horizontal outlet box install the sub base on the outlet box as shown in Fig 1 For a wall installation hold the subbase in position and mark holes for the anchors Fig 2 Obtain wall anchors locally Take care that the wires do not fall back into the wall opening Set aside subbase Drill two 3 16 in 4 8 mm holes and gently tap anchors into the holes until flush with the wall 2 Pull electrical wires through the cover plate if used and subbase cable opening Fig 3 See Wiring the Sub base section before pulling any wires IMPORTANT Use 18 gauge color coded thermostat cable for proper wiring 3 Secure the subbase with the screws provided Do not fully tighten the subbase screws Fig 1 Installation of subbase on outlet box A NOT INCLUDED WITH UNIT M3703 Fig 2 Installation of subbase on wall WIRES THROUGH WALL OPENING ANCHORS MOUNTING 2 HOLES X N MOUNTING M926 SUBBASE SCREWS 2
14. sulation to pre vent drafts from affecting the thermostat Fig 4 Wiring connections FOR STRAIGHT INSERTION STRIP 5 16 in 8 mm p BARRIER ur SUBBASE TERMINAL SCREW M928 FOR WRAPAROUND STRIP 7 16 in 11 mm Fig 5 Jumper RC and RH terminals for single transformer system Strip wire 3 4 in 19 mm f 0Jo e UH Ro Ry M929 Fig 6 Typical hookup for MM 2 Mini zone Control Panel with T874A Thermostat Q674B D Subbase in single stage heating cooling two zone system 874 THERMOSTAT Q674B SUBBASE MINIZONE T874A THERMOSTAT Q674D SUBBASE AA ZONE1 ZONE2 RELAY RELAY MM 2 CONTROL PANEL HEAT COOL RELAY RELAY Se CONTROL COOLING EQUPMENT G sini HEAT 8 e 24 V 40 VA 2 4 TRANSFORMER 1 DAMPER ACTUATOR DAMPER ACTUATOR A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A ZONE 1 O AND B TERMINALS MUST BE CONNECTED FOR PROPER SYSTEM OPERATION A JUMPER RC AND RH TERMINALS TOGETHER AND WIRE AS SINGLE R TERMINAL A DO NOT CONNECT W2 AND Y2 TERMINALS TO CONTROL PANEL M1633 69 0580 2 MOUNTING THE THERMOSTAT 1 Remove the thermostat cover by pulling the bottom edge of the cover outward away
15. ts 2 Set the thermostat cover on a table near an accurate thermometer 3 Allow ten minutes for the cover thermometer to sense the area temperature compare the readings Be care ful not to touch the thermometer or breathe on it 4 Ifthereadings are the same replace the cover and put the system into operation 5 If the readings are different insert a small screw driver in the thermometer slot Fig 14 and turn it until the thermometers have the same reading 6 Replace the thermostat cover and put the system into operation M5070 NOTE Hand heat will offset the thermometer reading After making each adjustment wait ten minutes for the thermometer to stabilize before comparing Honeywell Home and Building Control Home and Building Control Helping You Control Your World Honeywell Inc Honeywell Limited Honeywell Limit e 1985 Douglas Drive North 740 Ellesmere Road Q Golden Valley Minnesota 55422 Scarborough Ontario 2V9 QUALITY IS KEY Printed in U S A
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