Honeywell Thermostat Q674D User Manual - Honeywell Thermostat Manual Download

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Sunday, April 5, 2020

Honeywell Thermostat Q674D User Manual

T874A,D Zone Thermostats/ Q674B,D,E Subbases Installation Instructions for the Trained Service Technician. See Table 1 for thermostat/subbase and system compatibil- Application ity; see Table 2 for thermostat specifications. For complete Honeywell Trol-A-Temp System specification and appli- These T874A,D Zone Thermostats and Q674B,D,E cation information, refer to the system specification in- Subbases provide 24 to 30 Vac temperature control in cluded with the control panel. Honeywell Trol-A-Temp heating/cooling zone systems. TABLE 1—THERMOSTAT/SUBBASE AND SYSTEM COMPATIBILITY. Thermostat/ Application Subbase Model Numbera Mini-Zone Mabs II, 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 a Subbase not included with thermostat; order separately. TABLE 2—THERMOSTAT/SUBBASE SPECIFICATIONS. Thermostat/ Anticipator Range (A) Thermostat/Subbase Switching Subbase Heating Cooling Order Numbera System Fan Color (Adj.) (Fixed) T874A1465/Q674B1471 HEAT-OFF-COOL ON-AUTO White/Gray Stg. 1— Stg. 1— T874A1465/Q674D1123 None None White/Gray 0.1 to 1.2 0 to 1.5 T874A1465/Q674E1379 HEAT-OFF-COOL-AUTO ON-AUTO White/Gray T874D1801/Q674B1463 HEAT-OFF-COOL ON-AUTO Beige/Brown Stg. 1— Stg. 1— T874D1827/Q674B1471 HEAT-OFF-COOL ON-AUTO White/Gray 0.1 to 1.2; 0 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 a Subbase not included with thermostat; order separately. Operation M3375 Recycling Notice On a 2-heat thermostat, the two stages of heat make This control contains mercury in a sealed tube. Do not sequentially as the temperature drops. Make refers to the place control in the trash at the end of its useful life. mercury switch initiating a call for heat or cool. If this control is replacing a control that contains mercury There are about 2° F [1° C] between stages so that the in a sealed tube, do not place your old control in the trash. second stage makes only when the first stage cannot Contact your local waste management authority for handle the load. This is the interstage differential. 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 • • ©Honeywell Inc. 1993 • Form Number 69-0580—2 M3375 Installation Fig. 1—Installation of subbase on outlet box. 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 HORIZONTAL OUTLET application. BOX 1 3. Installer must be a trained, experienced service SUBBASE technician. 1 NOT INCLUDED WITH UNIT. 4. After installation is complete, check out product M3703 operation as provided in these instructions. Fig. 2—Installation of subbase on wall. ! CAUTION 1. Disconnect power supply to prevent electrical WALL shock or equipment damage. 2. To prevent interference with the thermostat WIRES THROUGH linkage, keep wire length to a minimum and WALL OPENING 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- WALL trols. This can burn out the thermostat heat ANCHORS MOUNTING anticipator. (2) HOLES MOUNTING IMPORTANT: Thermostats are calibrated at the factory by M926 SUBBASE SCREWS (2) using subbases mounted at true level. Inaccurate sub- base leveling will cause thermostat control deviation. Fig. 3—Subbase components and leveling LOCATION procedure. Locate the subbase about 5 ft [1.5 m] above the floor in TOP WIRING THERMOSTAT an area with good air circulation at average temperature. MOUNTING TERMINAL CABLE OPENING HOLES (2) Do not mount the subbase where the thermostat may be SPIRIT LEVEL 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 MOUNTING POST (2) FOR TO SPRING FINGER The thermostat subbase can be mounted on a horizontal HOLES (2) MOUNTING CONTACTS ON THE outlet box or directly on the wall. THERMOSTAT THERMOSTAT (UP TO 12) 1. To mount on a horizontal outlet box, install the sub- M927 base on the outlet box as shown in Fig. 1. For a wall installation, hold the subbase in position and 4. Level the subbase using a spirit level, as shown in mark holes for the anchors (Fig. 2). Obtain wall anchors Fig. 3, and firmly tighten the subbase mounting screws. locally. Take care that the wires do not fall back into the The subbase mounting holes allow minor out-of-level wall opening. Set aside subbase. Drill two 3/16 in. [4.8 mm] adjustments. holes and gently tap anchors into the holes until flush with the wall. IMPORTANT: An incorrectly leveled subbase will cause 2. Pull electrical wires through the cover plate (if used) the temperature control to deviate from set point. and subbase cable opening (Fig. 3). See Wiring the Sub- base section before pulling any wires. WIRING THE SUBBASE All wiring must comply with local electrical codes and IMPORTANT: Use 18 gauge, color-coded thermostat ordinances. Follow equipment manufacturer wiring in- cable for proper wiring. structions when available. To wire subbase: 1. Connect wires to the subbase terminals. Refer to 3. Secure the subbase with the screws provided. Do not Figs. 6-10 for wiring diagrams of typical zone systems. A fully tighten the subbase screws. 2 letter code is located near each subbase terminal for identi- fication. The terminal barrier permits straight or conven- Fig. 5—Jumper RC and RH terminals for single tional wraparound wiring connection (Fig. 4). transformer system. Strip wire 3/4 in. [19 mm]. 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. RC RH 5. Plug the hole with nonflammable insulation to pre- vent drafts from affecting the thermostat. Fig. 4—Wiring connections. FOR STRAIGHT INSERTIONÐ FOR WRAPAROUNDÐ STRIP 5/16 in. [8 mm] STRIP 7/16 in. [11 mm] BARRIER RC RH SUBBASE TERMINAL SCREW M928 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. T874A THERMOSTAT/ T874A THERMOSTAT/Q674B SUBBASE Q674D SUBBASE 2 3 4 4 3 OG BY1 RC RH W1 W2 Y2 Y1 Y2 RC RH W2 W1 MINIZONE (MM-2) CONTROL PANEL HEAT COOL ZONE 1 ZONE 2 RELAY RELAY RELAY RELAY Y2 Y1 O G2 CHANGEOVER TO SINGLE- G1 CONTROL STAGE ZONE 1 ZONE 2 HEATING/ RC O1 T6 T6 COOLING COOL EQUIPMENT RH FAN G1 T5 T5 B HEAT B1 T4 T4 W2 B M6 M6 W1 24 V, 40 VA 2 M4 M4 E TRANSFORMER 1 M1 M1 L2 4 56Z 4 56Z 1 L1 DAMPER DAMPER (HOT) ACTUATOR ACTUATOR 123X 123X 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 ZONE 1 O AND B TERMINALS MUST BE CONNECTED FOR PROPER SYSTEM OPERATION. 3 JUMPER RC AND RH TERMINALS TOGETHER AND WIRE AS SINGLE R TERMINAL. 4 DO NOT CONNECT W2 AND Y2 TERMINALS TO CONTROL PANEL. M1633 3 69-0580—2 MOUNTING THE THERMOSTAT spring fingers are not bent flat, preventing proper electri- 1. Remove the thermostat cover by pulling the bottom cal contact with the subbase. edge of the cover outward away from the base until it snaps 4. Set the heat anticipator indicator(s) to 0.1A for free from the cover clip. proper system operation (Fig. 11). 5. Note the two tabs on the top inside edge of the NOTE: The cover is hinged at the top and is removed by thermostat base. The tabs fit into the corresponding slots pulling out at the bottom. on the top of the subbase. Mount the thermostat on the subbase. See Fig. 12. 2. Carefully remove and discard the polystyrene packing 6. Align the two captive mounting screws in the thermo- insert that protects the mercury switches during shipment. stat base with the posts on the subbase (Fig. 12). Tighten 3. Turn over the thermostat base and note the spring both screws. Do not overtighten the screws or damage to fingers that engage the subbase contacts. Make sure the the subbase posts can result. Fig. 7—Typical hookup for MABS II and MABS 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/ T874A THERMOSTAT/ T874A THERMOSTAT/Q674B SUBBASE Q674D SUBBASE Q674D SUBBASE 2 2 2 3 4 4 4 OGBY1 RC RH W1 W2 Y2 Y1 Y2 RC RH W2 W1 Y1 Y2 RC RH W2 W1 MABS II CONTROL PANEL EM. HEAT SECOND FAN HEAT COOL CAC ZONE 1 ZONE 2 ZONE 3 RELAY STAGE RELAY RELAY RELAY RELAY RELAY RELAY RELAY RELAY Y 2 Y 1 O ZONE 1 ZONE 2 ZONE 3 G T T T 2 TO SINGLE- CHANGEOVER 8 8 8 G T T T STAGE CONTROL 1 7 7 7 HEATING/ COOLING R COOL O T T T EQUIPMENT C 1 6 6 6 G T T T R ADD-A- FAN 1 5 5 5 H ZONE B A HEAT B T T T 4 1 4 4 4 W A EM. HEAT E M M M 2 3 1 6 6 6 W A 24 V, 40 VA 2 M M M 1 2 4 4 4 E A TRANSFORMER 1 M M M 1 1 1 1 1 L2 45 6Z 45 6Z 45 6Z DAMPER DAMPER DAMPER L1 ACTUATOR ACTUATOR ACTUATOR (HOT) 12 3X 12 3 X 12 3X 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 JUMPER RC, RH TOGETHER AND WIRE AS SINGLE R TERMINAL. 3 ZONE 1 O AND B TERMINALS MUST BE CONNECTED FOR PROPER SYSTEM OPERATION. 4 DO NOT CONNECT W2 AND Y2 TERMINALS TO CONTROL PANEL. M1634 4 Fig. 8—Typical hookup for MABS II 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 2 3 4442 2 RC OGBY2W2Y1RH W1 RC Y2 W2 Y1 RH W1 RC Y2 W2 Y1 RH W1 MABS II CONTROL PANEL EM. HEAT SECOND FAN HEAT COOL CAC ZONE 1 ZONE 2 ZONE 3 RELAY STAGE RELAY RELAY RELAY RELAY RELAY RELAY RELAY RELAY Y2 Y1 O ZONE 1 ZONE 2 ZONE 3 G2 T8 T8 T8 TO SINGLE- CHANGEOVER G1 T7 T7 STAGE CONTROL T7 HEATING/ O1 COOLING RC COOL T6 T6 T6 EQUIPMENT RH ADD-A-ZONE FAN G1 T5 T5 T5 B A4 HEAT B1 T4 T4 T4 W2 A3 EM. HEAT E1 M6 M6 M6 W1 A2 24 V, 40 VA 2 M4 M4 M4 E A1 TRANSFORMER 1 M1 M1 M1 1 L2 45 6Z 45 6Z 45 6Z L1 DAMPER DAMPER DAMPER ACTUATOR ACTUATOR ACTUATOR (HOT) 1 23X 12 3X 12 3X 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 JUMPER RC, RH TOGETHER AND WIRE AS SINGLE R TERMINAL. 3 ZONE 1 O AND B TERMINALS MUST BE CONNECTED FOR PROPER SYSTEM OPERATION. 4 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 ZONE 2 ZONE 3 HEAT FAN COOL HEAT FAN COOL HEAT FAN COOL 1 MCM 2 CAC FC 3 ZONE 1 ZONE 2 ZONE 3 4 FAN FAN FAN ZONE SYS ZONE SYS ZONE SYS 5 ZONE ADD-A- 6 DAMPER DAMPER DAMPER 7 TO SINGLE- 8 STAGE YWGGhO B RC RH OPEN CLOSE OPEN CLOSE OPEN CLOSE HEATING/ 9 COOLING EQUIPMENT ZONE 1 ZONE 2 ZONE 3 12 GYR WM6 M4 M1 VO VC G YRWM6 M4 M1 VO VC GYRWM6 M4 M1 VO VC G G G 1 Y1 Y1 Y1 L2 Y2 Y2 Y2 L1 (HOT) R R R W1 W1 W1 2 2 W2 W2 2 W2 O O O 456 Z 456Z 456Z B DAMPER B DAMPER B DAMPER ACTUATOR ACTUATOR ACTUATOR T874A T874A T874A 123X 123X 123X THERMOSTAT/ THERMOSTAT/ THERMOSTAT Q674B OR E Q674B OR E Q674B OR E SUBBASE SUBBASE SUBBASE 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 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. M1636 6 r Settings Checkout Before beginning checkout of thermostat operation, To set up the system for thermostat checkout, adjust set switches on the control panel for the desired system each thermostat settings as shown in Table 5. operation. See instructions provided with the control panel. 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 delay 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 ! CAUTION allow the furnace to heat the plenum. The fan starts Do not operate cooling equipment if outdoor immediately in electric heat systems. Allow 30 seconds temperature is below 50° F [10° C]. Refer to for the damper to open or close completely. manufacturer recommendations. Make sure all zone thermostats are set as instructed in Make sure all zone thermostats are set as instructed in the Heating column in Table 5. Check each zone thermo- the Cooling column in Table 5. Check each zone thermo- stat as follows: stat as follows: 1. If thermostat has a fan switch, set it to ON. See 1. Move cooling set point lever on the zone thermostat Fig. 13. After 30 seconds, place your hand in front of an 10° F [6° C] below room temperature to call for cooling. air register in that zone to check for air flow at the register. 2. After 30 seconds, place your hand in front of an air 2. Reset fan switch, if provided, to AUTO. After 30 sec- register in that zone to check for cool air at the register. onds, make sure air flow at register has stopped. 3. Move the cooling set point lever on the zone thermo- 3. Move heating set point lever on zone thermostat ° ° ° ° stat 10 F [6 C] above room temperature to end the call for 10 F [6 C] above room temperature to call for heat. cooling. After 30 seconds (longer, if necessary, for time 4. After 30 seconds (longer, if necessary, for time delay delay on control panel), check that air flow at the register on plenum fan control), check for warm air at the register. has stopped. 5. Move heating set point lever on the zone thermostat 4. Repeat steps 1-3 for each 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 When system checkout is complete, return all thermo- plenum fan control or control panel), check that air flow at stats to the desired settings for normal system operation. the register has stopped. 6. Repeat steps 1-5 for each zone thermostat. 9 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: 1. Remove the thermostat cover by pulling up from the bottom of cover until it clears the mounting slots. 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. If the readings are the same, replace the cover and put M5070 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. NOTE: Hand heat will offset the thermometer reading. After making each adjustment, wait ten minutes for the thermometer to stabilize before comparing. Home and Building Control Home and Building Control Helping You Control Your World Honeywell Inc. Honeywell Limited—Honeywell Limitée 1985 Douglas Drive North 740 Ellesmere Road Golden Valley, Minnesota 55422 Scarborough, Ontario M1P 2V9 QUALITY IS KEY Printed in U.S.A.

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