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AT120A-E; AT140A-E; AT150A,B,D-F; AT160B; AT175A-D,F Transformers PRODUCT DATA FEATURES • AT120 is rated at 20 VA. • AT140 is rated at 40 VA. • AT150 is rated at 50 VA. • AT160 is rated at 60 VA. • AT175 is rated at 75 VA. • All models meet National Electrical Code Class 2 not wet, Class 3 wet transformer requirements. • All models conform to Underwriters Laboratories Inc. Standard UL 1585. APPLICATION These general purpose transformers provide power to 24 Vac circuits. They are typically used in heating/cooling control systems, but can be used in any application that doesn’t exceed the load ratings. • Color-coded leadwires for primary connections and screw terminals for secondary connections, fixed 1/4 inch (6 mm) male quick-connects or color-coded leadwires for both primary and secondary, are standard. • Models available with stripped leadwires, leadwires with variety of terminals, or special terminations as required on both primary and secondary. • Mounting options include clamp mounting on outlet box knockout, plate mounting, foot mounting, panel mounting, conduit/panel and a combination. • Models available for 120V, 240V, 277V, 480V, 120/240V, 208/240V, 277/480V, 120/208/240V, 208/240/480V, or 208/277/480V supply at 60 Hz. • “F” models include a button for manually resetting the circuit breaker. Contents Application ........................................................................... Features .............................................................................. Specifications ...................................................................... Ordering Information ........................................................... Installation ........................................................................... Checkout ............................................................................. ® U.S. Registered Trademark Copyright © 1996 Honeywell Inc. • All Rights Reserved 1 1 2 2 8 11 68-0054-5 AT120A-E; AT140A-E; AT150A,B,D-F; AT160B; AT175A-D,F TRANSFORMERS SPECIFICATIONS replacement value. TRADELINE model specifications are the same as those of standard models except as noted below. IMPORTANT The specifications given in this publication do not include normal manufacturing tolerances. Therefore, a sample unit may not match the listed specifications exactly. Also, this product is built and tested under closely controlled conditions, and some minor differences in performance can be expected if those conditions are changed. TRADELINE Models Available: AT150F Transformers with circuit breaker reset button; 50 VA. AT175F Transformers with circuit breaker reset button; 75 VA. Models: AT120A-E; AT140A-E; AT150A,B,D-F; AT160B; AT175A-D,F. TRADELINE® Models Electrical Ratings: See Table 1. TRADELINE models are selected and packaged to provide ease of stocking, ease of handling, and maximum Table 1. Electrical Ratings. Secondary Output Voltage Model Number Output Rating at 100 Percent Power Factora Primary Input Voltage (60 Hz) Open Circuit At Rated Power Output AT120 20 VA 120, 240, 277, 480, 120/240, 27.0 24.0 208/240, 240/277, 277/480, AT140 40 VA 120/208/240, 208/240/480, or AT150 50 VA 208/277/480V AT160 60 VA AT175 75 VA 27.5 b aRefer to regulation curves. bVoltage is 27.0V on AT150F and AT175F models. Secondary—9 inch (230 mm) leadwires or fixed 1/4 inch (6 mm) quick-connects. Different length leadwires, leadwires with stripped ends or with terminals attached, and screw terminals also available. Specify when ordering. “F” models: Primary and Secondary—9 inch (230 mm) leadwires. Wiring Connections: “A”, “C”, and “D” models: Primary—9 inch (230 mm) leadwires; Secondary—screw terminals. “B” and “E” models: Primary—9 inch (230 mm) leadwires or fixed 1/4 inch (6 mm) quick-connects. Different length leadwires and leadwires with stripped ends or with terminals attached also available. Specify when ordering. ORDERING INFORMATION When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the TRADELINE® Catalog or price sheets for complete ordering number, or specify— 1. 2. 3. 4. Order number; TRADELINE, if desired. Primary voltage capability desired. Wiring connections desired. Optional specifications, if desired. If you have additional questions, need further information, or would like to comment on our products or services, please write or phone: 1. Your local Home and Building Control Sales Office (check white pages of your phone directory). 2. Home and Building Control Customer Relations Honeywell, 1885 Douglas Drive North Minneapolis, Minnesota 55422-4386 In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9. International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A. 68-0054—5 2 AT120A-E; AT140A-E; AT150A,B,D-F; AT160B; AT175A-D,F TRANSFORMERS Mounting Means: Model Suffix Letter Mounting Means A Includes clamp for outlet box knockout, 4 x 4 inch mounting plate for 2 x 4 inch or 4 x 4 inch outlet box, and mounting feet for surface mount. B Foot-mounted. C Includes clamp for outlet box knockout. D Integral 4 x 4 inch mounting plate fits 2 x 4 inch or 4 x 4 inch outlet box. E Panel mounted with two No. 8 screws (not included). F Includes 1/2-14 NPSM conduit connector and lock nut for mounting on plate or panel (not included) with 7/8 in. knockout, and mounting feet for surface mount. Dimensions: See Fig. 1 through 5. All models conform to Underwriters Laboratories Inc. Standard UL 1585. NATIONAL ELECTRICAL CODE: Class 2 not wet, Class 3 wet. Regulation: See transformer regulation curves, Fig. 6 through 10. Optional Specifications: End bells or caps on “B” through “E” models. Terminations on “B” through “E” models. Circuit breaker reset button on “F” models. Overcurrent Protection: Inherent on AT120, AT140, and AT150. Thermal fusible link on AT160 and AT175. Circuit breaker on AT150F and AT175F models. National Electrical Code: Class 2 not wet, Class 3 wet Approvals: UNDERWRITERS LABORATORIES INC. LISTED (“A”, “C” and “F” models): File No. E14881, Guide No. XOKV. UNDERWRITERS LABORATORIES INC. COMPONENT RECOGNIZED (“B,” “D,” “E” models): File No. E14881, Guide No. XOKV2. 3 68-0054—5 AT120A-E; AT140A-E; AT150A,B,D-F; AT160B; AT175A-D,F TRANSFORMERS PLATE OR OUTLET BOX MOUNTED AT CLAMP ON END BELL PLATE MOUNTED AT THE LAMINATIONS 1 A MAX. 1 (27) 16 B MAX. 3 (19) 4 FOOT MOUNTED C MAX. D 3 3 4 (44) 2 1 3 16 (81) 3 1 4 1 4 (57) 2 3 8 (60) 2 3 16 (5) 3 (10) 8 11 (22) 16 A Model AT120 AT140 120, 208/240V 120/208/240V AT150 AT175 in. 2-3/4 mm 70 in. 1-7/8 B C D mm in. mm in. mm 48 2-15/16 75 1-7/16 37 3 3 3 3-1/2 76 76 76 89 2 2 2-1/8 2-9/16 51 3-1/8 79 51 3-1/8 79 54 2-15/16 75 65 3-5/8 92 1-9/16 1-3/4 1-3/4 2-1/8 40 44 44 54 1 FOR AT120 MODELS, 1-15/16 (49). 2 FOR AT120 MODELS, 2-7/8 (73). 3 FOR AT120 MODELS, 1-7/16 (37). 4 FOR AT120 MODELS, 1-7/8 (48). M12123 Fig. 1. “A” model transformer dimensions in in. (mm). 68-0054—5 4 AT120A-E; AT140A-E; AT150A,B,D-F; AT160B; AT175A-D,F TRANSFORMERS 3/16 (5) A 4 G (MAX) D B 1 C F 3/8 (10) 2 3 E 1 "B" MODELS AVAILABLE WITH MOUNTING FEET; "E" MODELS ARE LESS MOUNTING FEET. 2 AVAILABLE WITH LEADWIRES OR FIXED 1/4 in. [6 mm] MALE QUICKCONNECTS. SCREW TERMINALS AVAILABLE ON SECONDARY. 3 MOUNTING HOLES STANDARD ON "E" MODELS ONLY. 4 1/4 in. (6 mm) ON AT175B. 1 1/16 (2) A Model AT120 AT140 AT150 AT160 AT175 in. 2-13/16 3-1/8 3-1/8 3-1/8 3-1/8 B mm 71 79 79 86 86 in. 1 7/8 7/8 1-3/8 1-3/8 C mm 25 22 22 35 35 in. 3/16 3/16 7/32 7/32 7/32 D mm in. mm 15/16 24 5 13/16 21 5 22 7/8 6 1-1/4 32 6 6 1-7/16 37 E in. 1-5/8 2-1/4 2-1/4 2-1/4 2-1/4 F in. mm 41 1-7/8 57 2-9/16 57 2-9/16 57 2-9/16 57 2-9/16 G mm in. mm 48 1-3/4 44 65 1-11/16 42 65 1-3/4 44 65 2-1/4 57 65 2-1/4 57 M12107 Fig. 2. “B” and “E” model transformer dimensions in in. (mm). 3 3 (86) 8 1 4 (6) 1 8 3 (3) 2 8 (60) 3 8 (86) 3 3 16 (106) 4 1 16 (52) 2 5 (8) 16 1 (3) 8 3 16 (5) 3 1 (83) 4 M12124 Fig. 3. Mounting plate dimensions in in. (mm). Mounting plate is shipped with “A” model transformers and attached on “D” model transformers. 5 68-0054—5 AT120A-E; AT140A-E; AT150A,B,D-F; AT160B; AT175A-D,F TRANSFORMERS "C" MODEL TRANSFORMER MOUNTED ON OUTLET BOX KNOCKOUT B D A C 1 TOP VIEW 7 (22) 8 1 1 (32) 4 7 (22) 8 SIDE VIEW "D" MODEL 3 1 7 (37) 16 3 (86) 8 1 (3) 8 1 4 (6) 3 8 (60) 2 2 3 8 (86) 3 3 16 (5) 5 (8) 16 3 1 (83) 4 A B C mm mm in. mm in. 48 13/16 21 1-15/16 49 57 1-1/16 27 2-1/4 57 57 1-1/16 27 2-1/4 57 57 1-1/2 38 2-1/4 57 C 7 (22) 8 B SIDE VIEW FRONT VIEW in. 1-7/8 2-1/4 2-1/4 2-1/4 1 3 16 (106) 4 1 16 (52) 2 Model AT120 AT140 AT150 AT175 D D mm in. 2-1/4 57 2-5/8 67 2-5/8 67 2-5/8 67 1 SECONDARY AVAILABLE WITH LEADWIRES, FIXED 1/4 in. (6 mm) MALE QUICK CONNECTS, OR SCREW TERMINALS. 2 PRIMARY ON "D" MODELS AVAILABLE WITH LEADWIRES OR FIXED 1/4 in. (6 mm) MALE QUICK CONNECTS. Fig. 4. “C” and “D” model transformer dimensions in in. (mm). 68-0054—5 6 M12122 AT120A-E; AT140A-E; AT150A,B,D-F; AT160B; AT175A-D,F TRANSFORMERS 7/16 (11) A A Model AT150F AT175F in. 1-3/4 2-1/8 B mm 45 54 in. 1-3/4 1-3/4 C mm mm in. 45 3-5/8 93 45 3-15/16 102 B 7/16 (11) 3-3/16 (81) 11/16 (17) 2-3/16 (56) C M12115 Fig. 5. “F” model transformer dimensions in in. (mm). AT150 REGULATION SECONDARY VOLTAGE (VOLTS) SECONDARY VOLTAGE (VOLTS) AT120 REGULATION 35 30 25 20 15 0 0.5 1.0 1.5 2.0 2.5 SECONDARY CURRENT (AMPS) 3.0 35 30 25 20 15 3.5 0 0.5 M12110 Fig. 6. AT120 regulation curve. 30 25 20 15 1.0 1.5 2.0 2.5 SECONDARY CURRENT (AMPS) 3.5 M12112 AT160 REGULATION SECONDARY VOLTAGE (VOLTS) SECONDARY VOLTAGE (VOLTS) AT140 REGULATION 0.5 3.0 Fig. 8. AT150 regulation curve. 35 0 1.0 1.5 2.0 2.5 SECONDARY CURRENT (AMPS) 3.0 3.5 35 30 25 20 15 0 M12111 Fig. 7. AT140 regulation curve. 0.5 1.0 1.5 2.0 2.5 SECONDARY CURRENT (AMPS) 3.0 3.5 M12113 Fig. 9. AT160 regulation curve. 7 68-0054—5 AT120A-E; AT140A-E; AT150A,B,D-F; AT160B; AT175A-D,F TRANSFORMERS "A" MODELS SECONDARY VOLTAGE (VOLTS) AT175 REGULATION 35 USE SCREWS OR BOLTS THROUGH SLOTS (4) IN MOUNTING FEET 30 25 20 15 0 0.5 1.0 1.5 2.0 2.5 SECONDARY CURRENT (AMPS) 3.0 3.5 M12114 Fig. 10. AT175 regulation curve. "B" MODELS USE SCREWS OR BOLTS THROUGH HOLES IN MOUNTING FEET INSTALLATION When Installing this Product… 1. Read these instructions carefully. 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 system operation as suggested in these instructions. "F" MODELS USE SCREWS OR BOLTS THROUGH SLOTS (4) IN MOUNTING FEET CAUTION Disconnect power supply before beginning installation to prevent electrical shock or equipment damage. Foot Mounting (“A”, “B”, and “F” Models Only) Mount using screws (not supplied) through the two (“B” models) or four (“A”, “F” models) holes in the mounting feet. Refer to Fig. 11. Line voltage primary connections must be made within an approved electrical enclosure. Discard the mounting plate (“A” models only). M12125 Fig. 11. Foot mounting. Plate Mounting (Refer to Fig. 12) (“A” and “D” models only) Mounting Plate to Transformer (“A” models only) Mount the plate to the transformer either: a. at the clamp on the primary end ball…OR… b. at the laminations. 68-0054—5 8 AT120A-E; AT140A-E; AT150A,B,D-F; AT160B; AT175A-D,F TRANSFORMERS PLATE MOUNTED AT CLAMP ON PRIMARY END BELL MOUNTING PLATE SCREW TERMINALS FOR SECONDARY CONNECTIONS END BELL LEADWIRES FOR PRIMARY CONNECTIONS CLAMP SCREW AND CLAMP M12126 Fig. 13. When screw is tightened, clamp holds plate on transformer. 1 RAISED PORTION OF LARGE CENTER KNOCKOUT WITH RAISED PORTION OF KNOCKOUTS FACING YOU: 1. PRY UP TOP SECTION OF LARGE KNOCKOUT BY INSERTING SCREWDRIVER FIRST AT ONE SIDE OF SLOT AND THEN AT THE OTHER SIDE. PLATE MOUNTED AT THE LAMINATIONS MOUNTING PLATE LEADWIRES FOR PRIMARY CONNECTIONS MOUNTING SCREW SCREW TERMINALS FOR SECONDARY CONNECTIONS 1 1 MOUNTING FEET ON "A" MODELS ONLY. 2. THEN PRY UP BOTTOM SECTION OF KNOCKOUT. M12109 Fig. 12. On “A” models, plate may be mounted to transformer in either of two positions. On “D” models, plate is factory-mounted at laminations. To Mount Plate at Primary End Bell: 쐃 Turn the screw on the clamp almost completely out. 쐇 Hold the mounting plate with the keyhole slots up and the raised portion of the large center knockout away from you. 쐋 From the back, v˙read the primary leadwires through the round center hole in the plate. 쐏 Fit the clamp and screw through the round hole. 쐄 While holding the plate in place, tighten the setscrew securely against the rim of the hole. Refer to Fig. 13. Avoid damaging the leadwires with the screwdriver. 3. REMOVE BOTH SECTIONS OF KNOCKOUT WITH PLIERS. SHADED AREAS REPRESENT KNOCKOUTS AND SCREW SLOTS USED WITH 2 X 4 INCH OR OCTAGONAL OUTLET BOXES. M9188 Fig. 14. Use screwdriver to pry out both sections of knockout. 9 68-0054—5 AT120A-E; AT140A-E; AT150A,B,D-F; AT160B; AT175A-D,F TRANSFORMERS Panel Mounting (“E” Models Only) To Mount Plate at Laminations: 쐃 Remove the large rectangular knockout in the mounting plate as shown in Fig. 14. 쐇 Hold the transformer with the clamp on the end bell facing you. 쐋 With the keyhole slots up, fit the mounting plate over the primary leadwires and the end bell. Insert the small tab at the bottom of the plate into the slot in the transformer mounting foot. 쐏 Insert the mounting screw (provided) through the holes as shown in Fig. 15. Secure the plate to the transformer, but do not overtighten the screw. “E” model transformers are designed for mounting inside a panel using No. 8 screws and washers (obtain locally) through at least two of the four holes in the laminations. Refer to Fig. 16. TRANSFORMER PLATE T AN R RT PO ME IM UNT OR F E MOANS SID TR HER OT M12127 Fig. 16. Mounting “E” model transformer in a panel cutout. Conduit/Panel Mounting Mount the transformer on a plate or panel (not included) with a 7/8 in. knockout. The transformer has a 1/2-14 NPSM conduit connector and lock nut. NOTE: To meet UL requirements, mount the transformer on a plate or panel with a maximum thickness of 0.15 in. This allows three and one-half threads of the conduit spud to be exposed after the transformer is mounted. M9163 Fig. 15. Secure plate on transformer with mounting screw and tab. 쐃 With the conduit connector side of the transformer facing the plate, thread the leadwires through the plate knockout. 쐇 Insert the connector in the knockout. 쐋 While holding the plate in place, assemble and tighten the lock nut to fasten the transformer securely. See Fig. 17. Avoid damaging the leadwires with the screwdriver. 쐏 Make line voltage primary connections within an approved enclosure. Mounting Transformer and Plate on Outlet Box The mounting plate may be mounted on 4 inch square boxes, 2 x 4 inch rectangular boxes, and on 4 inch octagonal boxes. 쐃 Line up the plate with the box to determine the proper mounting holes. The mounting feet and secondary terminals will be outside the box. 쐇 Remove the mounting hole knockouts if necessary. 쐋 Mount the plate on the outlet box using two screws (obtain locally). MOUNTING PLATE (NOT INCLUDED) LEADWIRES FOR PRIMARY AND SECONDARY CONNECTIONS Mounting Through Outlet Box Knockout (“A” and “C” Models Only) The transformer can be mounted on an outlet box using the clamp on the primary end bell. The mounting plate (“A” models only) is not used. To mount the transformer on an outlet box: 쐃 Turn the clamp screw almost completely out. 쐇 From outside box, thread the primary leadwires through suitable 7/8 inch knockout. Fit the clamp and screw through the knockout. 쐋 Tighten the clamp screw securely against the rim of the knockout. Avoid damaging the leadwires with the screwdriver. RESET BUTTON END BELL CONDUIT CONNECTOR LOCK NUT M6906 Fig. 17. Conduit/panel mounting (plate not included). 68-0054—5 10 AT120A-E; AT140A-E; AT150A,B,D-F; AT160B; AT175A-D,F TRANSFORMERS CHECKOUT SINGLE VOLTAGE MODELS COMMON 2 BLACK PRIMARY 3 VOLTAGE VARIES WITH MODEL 1 CAUTION SECONDARY Do not short transformer secondary terminals. Overload current protection inherent on AT120, AT140, and AT150. 3.5 Amp fuse available on AT160B and AT175A-D. 120V - WHITE 208V - RED 240V - ORANGE 277V - BROWN 480V - BLACK/RED Voltage Check 208/240 VAC MODELS COMMON After installation is complete, turn on power supply and perform a voltage check. 쐃 Place the controlled equipment in operation and observe through one complete cycle. 쐇 Using a voltmeter, verify proper primary and secondary voltages. 쐋 If voltage readings are incorrect, ensure primary voltage connections are made properly (refer to Fig. 18). 쐏 Measure voltage again. a. If proper primary voltage is measured and secondary voltage is significantly less than the voltage shown on the regulation curves, transformer winding is damaged. Replace transformer and repeat checkout procedures. b. If primary voltage is 0V, make sure power supply is connected properly or repair if necessary. Repeat checkout procedures. 쐄 Do not put the system into operation unless correct primary and secondary voltages are measured. 2 BLACK 208V PRIMARY 240V 3 RED 1 SECONDARY 1 SECONDARY 1 SECONDARY ORANGE 120/208/240 VAC MODELS 2 COMMON 120V PRIMARY 3 BLACK 208V WHITE 240V RED ORANGE 208/277/480 VAC MODELS 2 COMMON 208V PRIMARY BLACK 277V RED 480V BROWN Circuit Breaker (AT150F, AT175F Models only) Overloading the AT150F or AT175F Transformer results in tripping the circuit breaker. If the secondary side of the transformer is short circuited, the circuit breaker trips in less than one minute. Reset the circuit breaker by pressing the reset button on the top of the transformer. It can take up to one hour for the transformer to cool, allowing it to reset. If the circuit breaker continues to trip, thoroughly check the system for short circuits and the current draw. BLACK/RED 1 SECONDARY CONNECTIONS ARE SCREW TERMINALS, 1/4 INCH QUICK-CONNECTS OR BLUE AND YELLOW LEADWIRES. 2 BLACK IS COMMON WITH RESPECT TO THE TRANSFORMER WINDING ONLY AND NOT THE EXTERNAL CIRCUIT. 3 SOME MODELS AVAILABLE WITH 1/4 INCH QUICK-CONNECTS. M12108 Fig. 18. Schematic for single and multitap transformers. Wiring All wiring must comply with local codes and ordinances. Disconnect power before making wiring connections to prevent electrical shock or equipment damage. 쐃 Make primary connections to the line voltage power supply. On multitap models, make sure to use the correct leads or terminals for the available power supply. Refer to Fig. 18. 쐇 On multitap models with leadwires, insulate the ends of the unused leads by taping or capping with a solderless connector. 쐋 Make secondary connections to 24 Vac control circuit. 11 68-0054—5 AT120A-E; AT140A-E; AT150A,B,D-F; AT160B; AT175A-D,F TRANSFORMERS Home and Building Control Honeywell Inc. Honeywell Plaza P.O. Box 524 Minneapolis MN 55408-0524 Home and Building Control Honeywell Limited-Honeywell Limitée 155 Gordon Baker Road North York, Ontario M2H 2C9 Honeywell Latin American Division Miami Lakes Headquarters 14505 Commerce Way Suite 500 Miami Lakes FL 33016 Honeywell Europe S.A. 3 Avenue du Bourget B-1140 Brussels Belgium Honeywell Asia Pacific Inc. Room 3213-3225 Sun Hung Kai Centre No. 30 Harbour Road Wanchai Hong Kong Helping You Control Your World® 68-0054—5 C.B. Rev. 12-96 Printed in U.S.A. 68-0054—5 Printed on recycled paper containing at 12 least 10% post-consumer paper fibers. customer.honeywell.com