Honeywell T451 User's Manual
Contents
1. Phoenix Arizona 2000 to 4000 Las Vegas Nevada Move clockwise Calgary Alberta 2 to 3 marks 4000 to 6000 Denver Colorado Move clockwise Salt Lake City Utah 4 to 5 marks To Recalibrate 1 Remove cover Set the tab on setpoint knob to the leftmost radial mark visible on top of the triangular arm that holds the dual diaphragm sensor Fig 4 2 Without rotating the knob remove it from the thermostat by pulling straight out while holding the base against the wall 3 Now rotate the removed setpoint knob clockwise by the amount of temperature error Each mark on the triangular arm represents 2 F 1 C of adjustment Snap the knob back onto the setpoint cam Home and Building Control Home and Building Control Honeywell Inc 1985 Douglas Drive North Golden Valley MN 55422 Honeywell Limited Limit e 35 Dynamic Drive Toronto ON M1V 4Z9 95C 10903 1 4 Install the cover Wait five minutes to let the thermostat thermally stabilize and re check calibration Do not assume a thermostat is out of calibration until it has been installed and allowed to operate for several hours Fig 4 Recalibrating Thermostat Fig 5 Installing Range Stops Insert pins into temperature stop positions Security Features Range Stops 1 Set thermostat to desired setpoint Remove cover 2 Install plastic dowels supplied or purchased separately into minimum and or maximum range stop holes on inside b2. A Breaks on Positive Off A Exposed unused wires must be properly insulated Contact makes Black to Red on temperature fall Black to Blue on temperature rise 4 5 Pre bend and push leadwires into the electrical junction box Hold the thermostat base with one hand and remove the thermostat cover by grasping two sides of the cover and pulling outward NOTE f locking cover feature is desired insert the locking cover clip in the thermostat base BEFORE mounting the thermostat on the wall see Fig 7 Using the screwdriver secure the thermostat to the box by tightening the two mounting screws Handle thermostat with care Excessive pressure may damage the control knob or sensing element IMPORTANT Before mounting the thermostat turn the setting dial to the mid position indicator pointing to the top of the thermostat this will prevent damage to the dial stop if the dial is accidentally turned by the screw driver when the top mounting screw is tightened Do NOT press on diaphragm diaphragm lever arm or setpoint knob to seat thermostat on the box thermostat will be damaged Replacement Applications 1 Disconnect power supply before making wiring connections to prevent electrical shocks or equipment damage All wiring must comply with applicable codes and standards Remove the old thermostat from the wall taking care not to damage the wiring insulation Check the old insulation for cracks nick
3. Honeywell T451 T651 Motor Rated Precision Thermostats APPLICATION The T651 thermostat provides direct accurate line voltage control of inductively rated heating ventilating or cooling equipment used in commercial or industrial environments The T451 provides precision line voltage control of motor rated electric gas or oil heating equipment CL 4 01 Honeywell Limited Limit e 2001 PRODUCT DATA FEATURES Deluxe styling for commercial buildings Industrial grade MICRO SWITCH mechanism rated 1 2 hp inductive 5 kW resistive Vertical mounting on 2 x 4 NEMA standard single gang outlet box High sensitivity vapor filled stainless steel dual diaphragm sensing element Engineering plastic base to isolate sensor from switch heat and minimize droop CSA Certified UL Listed e Altitude compensation 44 F 7 C frost protection setting for heating application independent of calibration or altitude Color coded leadwire connections Range stops locking cover security features for public areas Contents SPSCHICATIONS sc ce ew ek ee ae ae 2 Ordering Information 0022 22 eee eee 2 Installation seara tas ets oid St oe Sine a eee 3 Setting and Adjustment 0000s eee eee 4 95C 10903 1 T451 T651 MOTOR RATED PRECISION THERMOSTATS SPECIFICATIONS ORDER INFORMATION Important The specifications given in this publication do not includ
4. Performance Certified for electric heating per C273 4A UL file E47434 Accessories 272804A Range stops and cover locking assembly included in selected models only 220213 Wallplate covers old T451 T651 1000 series wall marks TG511 Thermostat guard for security and protection Fig 1 Dimensions of T451 T651 in inches mm 54 2 1 8 Honeywell 5 4 1 2 je 75 __ 39 19 A 2 15 16 1 1 2 3 4 When purchasing replacement and modernization products from your TRADELINE wholesaler or your distributor refer to the TRADELINE catalog or price sheets for complete ordering number or specify 1 Model 2 Electrical load s 3 Accessories 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 Honeywell Home and Building Control Sales Office check white pages or phone directory 2 Home and Building Control Customer Satisfaction Honeywell Inc 1885 Douglas Drive North Minneapolis MN 55422 612 951 1000 3 In Canada Honeywell Limited 35 Dynamic Drive Toronto ON M1V 429 1 800 405 9835 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 95C 10903 1 T451 T651 MOTOR RA
5. TED PRECISION THERMOSTATS INSTALLATION WHEN INSTALLING THIS PRODUCT 1 Read these instructions carefully Failure to follow instructions can damage product or cause a hazardous condition 2 Check ratings given in instructions and on product to make sure product is suitable for your application 3 Make sure installer is a trained experienced service technician 4 After completing installation use these instructions to check out product operation Fig 2 Wiring connections T451A Heat only HOT _ Black _ T451B Heat only with positive off HOT Black N WARNING This thermostat is a line voltage 120 to 277 Vac control Do not install it unless you are completely familiar and competent with home wiring If improperly handled there can be a risk of 240 volt electric shock hazard which may cause serious injury or death N CAUTION 1 Disconnect power supply before making wiring connections to prevent electrical shock or equipment damage 2 All wiring must comply with national and local codes and ordinances 3 When using aluminum conductors all wiring connec tions to this thermostat must be made to the factory installed leadwires using approved CO ALR solderless connectors A fire hazard may result otherwise 4 To avoid handling the sensing element do not remove thermostat cover until wiring is completed 5 Thermostats are
6. ack of cover Fig 5 3 Re install cover Check operation of range stops Fig 6 Cover Locking Kit a P Allen screw and wrench Locking Cover 1 Remove cover by pulling straight out 2 Insert Tinnerman Speed Nut s into slots top and bottom of thermostat base 3 Drive Allen screw into Speed Nut until head is flush with outside edge of thermostat base 4 Re install cover Lock by backing out Allen screw until screw body protrudes through cover hole To unlock cover drive Allen screw into thermostat base Tinnerman speed nut Honeywell
7. designed for use with appliances having a limit control New Installations 1 Install a single gang electrical box oriented vertically about 4 to 5 1 5 m above the floor on an inside wall or pillar where the thermostat will be subjected to typical room temperature NOTE To sense temperature properly the thermostat must be placed away from concealed warm or cold water pipes air ducts or drafts from hallways fireplaces or stairways Do not place thermostat above convectors or in the flow from supply fans Ideally a thermostat should be close to the return air path to effectively measure average room temperature 2 Wire installation in an approved fashion NOTE 7651A and T451A do not feature a Positive Off setting and may not be used as a disconnect switch 3 Leave cover on the thermostat while making wiring connections Use solderless connectors approved for the type number and gauge of wires being joined Connect as per Fig 2 for the appropriate application j 7 3 Heat o eatin per Red Heating A pak L1 o a Black Toad A Red 7 Red A T651A Heat only T651A Cool only application Al Red Heating AJ red AN 1 T1 gt Load HOT Black 1 T1 gt Blue A Blue Contig Load T651A Heat Cool application A p Kor Bink LG coe Oe SS C o A Blue 7 h Cooling Load A Power supply provide disconnect means and overload protection as required
8. e normal manufacturing tolerances Therefore this unit may not exactly match the listed specifications This product is tested and calibrated under closely controlled conditions and some minor differences in performance can be expected if these conditions are changed Models T451A SPST and T451B DPST with positive off for heating only T651A SPDT for heating cooling Control Range 44 86 F 7 28 C for models T451A T651A 50 86 F 10 28 C for model T451B Sensing Element Vapor filled dual diaphragm Differential 2 F 1 C Droop 2 F mid load range Barometer Sensitivity 1 8 F wc 0 3 C kPa Thermometer 50 90 F 10 30 C in 10 F 5 C increments Electrical Ratings 50 60Hz 120V 208V 240V 277V Full Load 9 8A 5 6A 4 9A 4 2A Locked Rotor 58 8A 33 6A 29 4A 25 2A Pilot Duty 125 VA Resistive 22A Non Inductive 19ANI Heating Only 2 5kW 4 5kW 5kW ORDERING INFORMATION Finish Classic beige and light gold standard White models available Mounting Mounts directly on vertical single gang NEMA Standard 2 x 4 electrical box Wiring Connections 6 150 mm leadwires suitable for connecting to aluminum conductors wiring if used with approved special service CO ALR solderless wire connectors Leadwires color coded red for heating blue for cooling black for common Approvals Canadian Standards Association Certified File No LR1322
9. s or fraying Apply certified electrical tape where necessary to insulate wires or replace the wires in an approved fashion Complete installation following steps 3 to 6 in the New Installations section 95C 10903 1 T451 T651 MOTOR RATED PRECISION THERMOSTATS INSTALLATION Check Out Turn on power Raise the temperature setting to energize the heating contact and break the cooling contact The HVAC equipment should begin heating or stop cooling as appropriate NOTE For T451A and T651A models only the thermostat will call for heat disable cooling when the setpoint dial is at full counter clockwise position This setting is the phase change point of the diaphragm s vapor fill and is independent of calibration To de energize the load s turn off power at the circuit breaker panel or add a separate disconnect switch Altitude Compensation T451 T651 units are calibrated at the factory for accuracy at 500 feet above sea level No recalibration is needed if the switch operates at the same temperature indicated on the thermometer The vapor filled diaphragm sensor is affected by barometric pressure and altitude Deviations up to 1 F 1 2 C are within normal operation Control point drops 2 F every 1000 ft 1 C 300 m above sea level See Fig 3 for recommended action Fig 3 Altitude Correction Elevation Recommended in feet Typical City Action 0 to 2000 Toronto Ontario Leave as is
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