Honeywell T6570 User's Manual
Contents
1. ELECTRONICS _ j EMS For power supply provide disconnect means and overload protection required Special service CO ALR solderless connectors must be used when connecting with aluminum conductors Otherwise a fire hazard may result Jumper terminals 3 6 for Auto On fan operation If ventilation damper actuator not used cut off or insulate leadwire from Terminal 5 Fig 7 Wiring 2 pipe heat only thermostat with fan On Auto switch T6574B L2 L1 f VEE RS eee HOT i pote L ni For power Supply provide disconnect means and overload protection required Special service CO ALR solderless connectors must be used when connecting with aluminum conductors Otherwise a fire hazard may result Jumper terminals C 6 for Auto On fan operation If ventilation damper actuator not used cut off or insulate leadwire from Terminal 5 A EMS function disabled in this configuration Fig 8 Wiring 2 pipe seasonal heat cool changeover with external aquastat fan On Auto switch T6575B Gi G HEAT COOL A FAN SPEED o A For power supply provide disconnect means and overload protection required Special service CO ALR solderless connectors must be used when connecting with aluminum conductors Otherwise a fire hazard may result Jumper terminals 5 6 for continuous fan operation 4 6 for cycled fan operation Fig 9 W2. Fig 12 Wiring 4 pipe auto heat cool changeover with fan On Auto switch T6575B C D B shown sa A onore ELECTRONICS z HEAT COOL L2 L1 HOT gt Heat VALVE Cool VALVE 1K SPOT FAN SPEED Li a l MERA EMS A For power supplv provide disconnect means and overload protection required Special service CO ALR solderless connectors must be used when connecting with aluminum conductors Otherwise a fire hazard may result Connect 5 amp 6 for Fan Continuous operation Relay 1K isolates heating and cooling loads from each other at common fan Fig 13 Wiring 4 pipe heat cool with manual heat cool changeover switch cycled fan using external relay Fan Relay Control Center T8570 thermostats are typically used with load relays to switch line voltage loads Honeywell offers a convenient fan relay center the W6380 that provides 24 Vac power three interlocked fan relays and wiring center terminations for valve relay and contactor loads The W6380 schematic can be found in Fig 14 PIC 24 Vac P2 poH 5 MED f L LO pg oO L Gi e O LO NH P11 HEAT PBC HEAT VALVE je P13 O P14 L COOL VALVE coor Ag P10 Fig 14 W6380 wiring diagram T8574B L2 LI f HOT ELECTRONICS W6380B FAN RELAY CENTER For power supply provide disconnect me
3. This also applies to models with manual heat cool changeover c SINGLE STAGE COOLING 7 PROPORTIONAL i BAND La USER SETPOINT A USER SETPOINT CHANGED TO 21 5 C 71 F FROM SINGLE STAGE HEATING 23 C 73 F OR 20 C 68 F SETPOINT A Via USER BAND i PROPORTIONAL M17477 Fig 4 Single stage control AUTOMATIC CHANGEOVER WITH ZERO ENERGY DEADBAND SEE FIG 5 This type of control is available on auto changeover models only The user setpoint centers on the Zero Energy Deadband The cooling switch off point is positioned at the bottom end of the cooling proportional band Likewise the heating switch off point is positioned at the top end of the heating proportional band Zero Energy Deadband width is selectable in the Installer Setup mode EXAMPLE Using a deadband of 2 C 4 F and a user setpoint of 22 C 72 F the effective heating setpoint is 21 C 70 F and the effective cooling setpoint is 23 C 74 F A change to the user setpoint causes both heating and cooling setpoints to change in parallel This change is restricted to the minimum cooling setpoint or maximum heating setpoint limits set within the Installer Setup mode USER SETPOINT 20 0 i A USER SETPOINT CHANGED FROM 22 C 72 F TO 23 5 C 74 F mirare Fig 5 Sequence control with deadband OPERATING MODES The thermostat has two main operating modes Comfort and Energy Savings It also has an OFF mode sel
4. 4 x4 or vertical junction box See Fig 2 Mounting screws are supplied for alternatives 1 Feed leadwires through wiring access hole of wallplate and adaptor plate if used 2 Attach supply wires using wire nuts not provided or screw terminals as appropriate 3 Locate wallplate in the horizontal mounting position See Fig 2 if using the vertical junction box adapter plate 4 Push leadwires into electrical junction box and attach wallplate to box using machine screws provided in the appropriate mounting holes 5 Attach thermostat to wallplate a Locate the two center side holes on the back of the thermostat b Align the holes with the two wallplate side tabs c Press down firmly to snap thermostat into place M17505 Fig 2 Mounting the vertical junction box adapter plate M17505 Optional adapter plate Removing the thermostat CAUTION Equipment Damage Hazard Improper removal can damage the thermostat Carefully follow the thermostat removal directions If it is necessary to remove the thermostat from the wallplate see Fig 3 1 Use a screwdriver to pry thermostat left side away from the base 2 Use the screwdriver to pry thermostat s right side away from the wallplate 95C 10897 6 4 3 Use both hands to pull the thermostat straight away from the wallplate M15396 Fig 3 Removing the thermostat Thoroughly check wiring to the wallplate before finally mounting the thermostat on
5. Default Range Default Range C Scale 18 C 10 18 C 25 C 25 30 C F Scale 65 F 50 65 F 77 F 77 90 F Additional Switches FAN SPEED SWITCH SP3T LINE VOLTAGE Where supplied the fan switch allows the selection of three different settings low medium or high NOTE The installer should select Constant Fan mode if the fan motor is a type that does not start reliably at low speed SYSTEM HEAT COOL SWITCH SPST LOW VOLTAGE Where supplied this switch signals the microprocessor to operate the relays in either heating or cooling mode In heating mode the cooling relay is disabled In cooling mode the heating relay is disabled User Programming Modes TEMPERATURE COMFORT SETPOINT The temperature setpoint can be adjusted between 10 C and 30 C in steps of 0 5 C by using the UP and DOWN keys If F is set within the installer setup mode see later the range will be 50 F to 90 F adjustable in 1 F steps DISPLAY The measured room temperature is normally displayed unless rt 0 in the installer setup mode and the first press of the UP or DOWN keys will switch to display the user setpoint If no key is pressed for 5 seconds the display will return to showing the room temperature When the cooling relay is closed this will be indicated by a snowflake symbol whereas closure of the heating relay will be indicated by a flame symbol If there is a wiring problem or the room temperat
6. 0 Wiring 4 pipe 24V auto heat cool changeover thermostat with fan On Auto switch Wiring Remote Sensor The T8109 is a optional remote sensor that can be used as an alternative to the internal sensor of the T8575D The T8109 remote sensor plugs into the J2 header in the back of the thermostat On power up the T8575D will look for a T8109 and if there is one connected it will use this control If it does not find a T8109 connected it will use the internal sensor To change the sensor source turn off the thermostat power and disconnect the current sensor source Then connect the new sensor source and re power the thermostat On powerup the 95C 10897 6 10 T8575D will find the new sensor source and use this for control To extend the sensor cable up to a maximum of 70 feet 20m use only shielded cable For example Beldfoil 18 AWG cable is a suitable cable The sensor connections are polarity sensitive so be sure to connect the shielded wire to the sensor blue wire as shown in Fig 21 below af aad aw Fig 21 Wiring optional remote sensor for the T8575D model CAUTION Equipment Damage Hazard Operation at low temperatures can cause fan coil damage This thermostat is not a safety device Do not use it where the space temperature is outside of the device operating range A display of SF indicates a space temperature outside of the thermostat operating range 5 C to 45 C With SF displayed the thermostat ceases
7. 00 VA l Equivalent to NEMA 1 8 horsepower rating allowable load must be determined bv adding nameplate full load and locked rotor rating of all loads Minimum Operational Life at maximum load Thermostat contacts at 120 Vac 100 000 cvcles Manual Switches 10 000 operations a 43 16 122 _____________ a 1 7 16 37 gt T6570 T8570 SERIES DIGITAL FAN COIL THERMOSTATS Energy Savings Input 24 Vdc dry contact maximum resis tance of 1000 ohms Note Caution page 3 Protection Class IP30 Approvals CSA Certified C US LR158158 for Canada and the U S A Meets CE requirements Accessories Adapter plate for mounting on single or double gang NEMA standard vertical switch box 272878 line voltage models 24V 2000 series 272881 24 V models 1000 series T8109 remote temperature sensor for T8575D W6380 fan switching center for T8574 T8575 products 3 5 16 84 4 2 3 8 60 M12081A Fig 1 Nominal dimensions in inches mm INSTALLATION men Installing this Product Read these instructions carefully Failure to follow them could damage the product or cause a hazardous condi tion 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 techni cian 4 After installation is complete check out product opera tion as provid
8. ES DIGITAL FAN COIL THERMOSTATS SPECIFICATIONS Table 1 Applications Features Switches Control Number Energy Fan Auto 3 Speed 2 Pipe 4 Pipe of Savings On Changeover Remote On Off Fan Heat Wiring Models jVoltagejFan CoiljFan Coill Relays Input Auto Deadband Adjust Sensor SPST SP3T Cool Diagram T6748 I ag e shoe AR 120V el 1 A i z Fig 7 208 3 1 Fig 8 T6575B 277V 2 e Fig 9 50 2 e jFig 10 13 T6575C 60 Hz 2 Fig 11 13 T6575D 2 Fig 12 13 T8574B 2 1 Fig 15 24V 1 1 Fig 16 T8575B 50 2 ej Fig 17 60 Hz e 2 e e Fig 18 T8575C 2 Fig 19 T8575D 2 Fu Fig 20 l Heating application 2 Cooling application 3 2 pipe svstem with external aquastat 4 optional accessory Setpoint Range 10 C to 30 C 50 F to 90 F Supply Voltages 24 NEMA rated transformer 120 230 277 Vac 10 50 60 Hz depending on model select ed 0 5A Ambient Ratings Temperature Operating Range 5 C to 45 C 41 F to 113 F Shipping and Storage Range 20 C to 55 C 4 F to 131 F Humidity Range 5 to 95 RH non condensing at 26 C 79 F Thermostat Output 1spdt or 2 spst relay outputs depending on model ORDERING INFORMATION Enclosure cover base and wallplate Plasti
9. S MFI HEAT COOL For power supplv provide disconnect means and overload protection p Pp 38 pri required Special service CO ALR solderless connectors must be used when connecting with aluminum conductors Otherwise a fire hazard may result Jumper terminals 5 6 for continuous fan operation Refer to Fig 12 for cycled fan operation Fig 18 Wiring 4 pipe 24V heat cool with manual heat cool changeover switch continuous fan 95C 10897 6 T6570 T8570 SERIES DIGITAL FAN COIL THERMOSTATS T8575C L2 L1 peranna z HOT Heat VALVE Cool VALVE A W6380B FAN RELAY CENTER A For power supply provide disconnect means and overload protection required Special service CO ALR solderless connectors must be used when connecting with aluminum conductors Otherwise a fire hazard may result Jumper terminals 5 6 for continuous fan operation Fig 19 Wiring 4 pipe 24V auto heat cool changeover with continuous fan T8575D oul FI N 5 i E z c B T E weal jie R j tE VALVE MOTOR o x N END SWITCH A l 2 sore c 8 TAN S 7 l LT EMS A For power supply provide disconnect means and overload protection required Special service CO ALR solderless connectors must be used when connecting with aluminum conductors Otherwise a fire hazard may result Valve end switches must be rated for fan load Fig 2
10. T6570 T8570 Series Honeywell Digital Fan Coil Thermostats APPLICATION T6570 Series Digital Fan Coil thermostats provide line voltage on off control for fans valves compressors or auxiliary electric heaters in fan coil and small air conditioner applications T8570 Series provides low voltage control of these functions Models are available for control of single stage air conditioner and various fan coil units 2 pipe 2 pipe with manual heat cool changeover 4 pipe with manual heat cool changeover 4 pipe with automatic heat cool changeover All models are suitable for multiple applications Changes in output wiring and external links between wiring terminals can configure the thermostat for the appropriate application The fan can also be controlled from the thermostat In some cases it is wired to run continuously and can be switched off with the On Off switch Other models can be installed with fan running continuously or cycling with the thermostat Compressors and auxiliary electric heaters can be controlled using a relay or contactor controlled by the thermostat PRODUCT DATA FEATURES e Simple user interface Attractive modern styling ideal for offices or hotels e Digital display of ambient temperature with user activated temperature display e Digital display shows mode icons when cooling or heating relays operate or when energy savings mode is active e Push button setpoint adjust
11. ans and overload protection required Special service CO ALR solderless connectors must be used when connecting with aluminum conductors Otherwise a fire hazard may result Jumper terminals 4 6 for Auto On fan operation Terminal 5 may be used to operate a 24 Vac ventilation damper actuator Fig 15 Wiring 2 pipe 24V cool only thermostat with fan On Auto switch T6570 T8570 SERIES DIGITAL FAN COIL THERMOSTATS T8574B L2 L1 pr W6380B FAN RELAY CENTER For power supply provide disconnect means and overload protection required Special service CO ALR solderless connectors must be used when connecting with aluminum conductors Otherwise a fire hazard may result Jumper terminals 3 6 for Auto On fan operation Terminal 5 may be used to operate a 24 Vac ventilation damper actuator Fig 16 Wiring 2 pipe 24V heat thermostat with fan On Auto switch T8575B ELECTRONICS MI HEAT COOL A For power supply provide disconnect means and overload protection required Special service CO ALR solderless connectors must be used when connecting with aluminum conductors Otherwise a fire hazard may result Jumper terminals 5 6 for continuous fan operation 4 6 for cycled fan operation Terminal 5 may be used to operate a 24 Vac ventillation damper actuator Fig 17 Wiring 2 pipe heat cool with manual heat cool changeover switch continuous or cycled fan T8575B ELECTRONIC
12. c Control Performance On Off control with P I algorithm gives typical control to 0 75 C 1 5 F at 22 C 72 F and 50 duty cycle Junction Box Mounting Direct mounting on single gang NEMA 2 x 4 surface mount electrical box or on 4 x 4 box with optional 272878 adapter plate Wiring 11 terminals screw in terminals capable of accepting up to 2 x 18 AWG 1 x 14 AWG or 1 5 mm2 wires Some terminals pre fitted with color coded flyleads When purchasing replacement and modernization products from your TRADELINE wholesaler or distributor refer to the TRADELINE Catalog or price sheets for complete ordering number If you have additional questions need further information or would like to comment on our products or services please write or phone 1 Yourlocal Honeywell Automation and Control Products Sales Office check white pages of your phone directory 2 Honeywell Customer Care 1885 Douglas Drive North Minneapolis Minnesota 55422 4386 In Canada Honeywell Limited Honeywell Limit e 35 Dynamic Drive Scarborough Ontario M1V 429 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 10897 6 2 Table 2 Electrical Rating 50 60 Hz 24V 120V 208V 230V 277V Amps Resistive 3 8 38 38 38 38 Full Load Inductive 3 0 301 30 30 30 Pilot Duty 1
13. ected by the On Off switch T6570 T8570 SERIES DIGITAL FAN COIL THERMOSTATS OFF MODE When the system switch is set to Off power is removed from the thermostat electronics and output terminals and the display will go blank The thermostat will reboot when power is restored with the On Off switch NOTE This On Off switch is a functional switch and should not be used as an isolating switch STARTUP On first powering up or after the On Off switch has been set to On the thermostat undergoes a startup and self checking sequence First all LCD display segments are illuminated to check the display Next a number appears to indicate the software version The final check is a check of the sensor On completion of the startup sequence after approximately 2 seconds the thermostat will resume normal control in either Comfort or Economy mode On initial power on the temperature setpoint defaults are as shown in the following table The current setpoint is stored in EEPROM and if the thermostat is switched off then on again it will resume control at the last known setpoint Table 3 Power Up Default Setpoints Power Up Default Setpoints 1 relay or heat cool changeover 2 relay cool models sequence models C Scale F Scale C Scale F Scale Setpoint 22 73 22 73 Default Cooling OFF 23 75 point Heating OFF 21 71 point COMFORT MODE This is the normal operating mode wh
14. ed in these instructions CAUTION Electrical Shock or Equipment Damage Hazard Can shock individuals or short equipment circuitry Disconnect power supply before installation IMPORTANT T6570 Series are line voltage powered devices All wiring must comply with national and local electri cal codes ordinances and regulations Provide disconnect means and overload protec tion as required T8570 Series thermostats must be powered by an Approved 24 Vac Class 2 transformer such as a W6380 Relay Control Center Location The T6570 T8570 series thermostats are the temperature control element in a fan coil or air conditioning system They must be located about 1 5m 5 ft above the floor in a position with good air circulation to sense room temperature The optional T8109 sensor can be used to sense temperature in return air ductwork instead of at the thermostat IMPORTANT Do not mount device where it can be affected by Drafts or dead spots behind doors or in corners Hot or cold air from ducts Radiant heat from the sun or appliances Unheated uncooled areas such as an outside wall behind the thermostat Concealed pipes or chimneys BONE a 95C 10897 6 T6570 T8570 SERIES DIGITAL FAN COIL THERMOSTATS Mounting Any T6570 T8570 series thermostat can be mounted directly on the wall on a 65x65mm junction box or a 2 x4 horizontal junction box An optional adapter plate is available for mounting on a
15. ere the thermostat controls to the setpoint selected bv the user On initial power up the user setpoint will return to the last known or default value Control action will be determined by either the default settings or the installer set parameters See page 6 ENERGY SAVINGS MODE Energy Savings mode is activated by a dry contact closure on the special Energy Management System EMS input from an occupancy detector window contact etc If the signal via input terminals 10 and 11 is calling for Energy Savings mode then the thermostat will control to user installer defined setback setpoints for increased energy savings The display will show a symbol to indicate the Energy Savings mode is active For example if the user setpoint is 21 C 70 F and the Energy Savings mode setpoint for cooling unoccupied cooling setpoint has been set to 28 C 82 F then the thermostat controls to 28 C 82 F when the input signal activates the economy mode There is no user override as long as the EMS signal is present The default Energy Savings mode setpoints are shown in table 4 The Energy Savings mode input can be configured within the installer setup mode to be activated by either a short circuit default or open circuit signal 95C 10897 6 T6570 T8570 SERIES DIGITAL FAN COIL THERMOSTATS Table 4 Energy Saving Mode Default Settings Energy Savings Mode Setpoints Heating Setpoint Cooling Setpoint Description
16. iring 2 pipe heat cool with manual heat cool changeover switch continuous fan or cycled fan 95C 10897 6 8 T6575B NP For power supply provide disconnect means and overload protection required Special service CO ALR solderless connectors must be used when connecting with aluminum conductors Otherwise a fire hazard may result Jumper terminals 5 6 for continuous fan operation Refer to Fig 12 or 13 for cycled fan operation Fig 10 Wiring 4 pipe heat cool with manual heat cool changeover switch continuous fan T6575C ia Pn n HOT None o ELECTRONICS n _ _ m _ FAN SPEED ee A For power supply provide disconnect means and overload protection required Special service CO ALR solderless connectors must be used when connecting with aluminum conductors Otherwise a fire hazard may result Jumper terminals 5 6 for continuous fan operation Refer to Fig 12 or 13 for cycled fan operation Fig 11 Wiring 4 pipe auto heat cool changeover T6575B C D D shown L2 L1 joe HOT UN ZOD4JOMFM For power supply provide disconnect means and overload protection s required Special service CO ALR solderless connectors must be used when connecting with aluminum conductors Otherwise a fire hazard may result Valve end switches must be rated for fan load If ventilation damper actuator not used cut off or insulate leadwire from Terminal 5
17. ment e Switches allow manual control of system operation and fan speed e Energy savings mode external energy savings input from time switch occupancy sensors or hotel cardkey overrides comfort setpoint with setback heating or cooling setpoint e Energy savings input configurable normally open or normally closed Proportional plus integral P HI control algorithm for precision temperature regulation e Mounts directly onto wall or standard junction box or vertical junction box with optional adapter plate e Installer setup mode allows changes of operating parameters e Selectable C or F display e Adjustable deadband some models for heat and cool control e Selectable energy savings setup cooling and setback heating setpoints e Adjustable maximum heating and minimum cooling setpoint limits e Adjustable minimum relay off times heating or cooling for compressor short cycle protection e EEPROM permanently retains user settings during power loss no batteries required e Capability to display temperature sensor failure for easier troubleshooting e Optional remote sensor T8575D only Contents Application 8 i 1 EER ORO CR Re RE EEA 1 SPECINCALIONS cic cir ee 2 Ordering Information su 2 Installation an 3 Operation E E 4 Operating MOdeSs ennnnnnnnennnnnn nn an rt nt 5 WiIringiosrnhe liane bade epee ean rin 6 95C 10897 6 T6570 T8570 SERI
18. rn the display to its normal operating mode T6570 T8570 SERIES DIGITAL FAN COIL THERMOSTATS Table 5 Thermostat Parameter Options C Scale F Scale Parameter ID Description Default Values Default Values Temperature Scale tS JAllows selection of either C or F scale Yes No Dead Band db Setting deadband Zero Energy Band 2 2 3 4 4 3 4 5 Heat or Cool OP Setting operating mode on single relay O 0 cool 0 0 cool Operating Mode non changeover models to either Heat 1 heat 1 heat or Cool Unoccupied Cooling juC Program unoccupied cooling setpoint 25 25 to 30 77 77 to 90 Setpoint for energy savings Unoccupied Heating uH JProgram unoccupied heating setpoint 18 10 to 18 65 50 to 65 Setpoint for energy savings Minimum Cooling CO Setting cooling off time for short cycle JO 0 3 4 5 0 0 3 4 5 Off Time prevention Minimum Heating HO Setting heating off time for short cycle O 0 3 4 5 0 0 3 4 5 Off Time prevention Minimum Cooling CL Sets the minimum allowable cooling 10 10 to 30 50 50 to 90 Setpoint Low Limit setpoint Maximum Heating HL Sets the maximum allowable heating 30 10 to 30 90 50 to 90 Setpoint High Limit setpoint Energy Savings ES Activate energy savings mode by a 1 1 normally open 1 1 normally open Configuration choice of either contact closure or 0 normally closed 0 normally closed contact opening Display of Room rt Allows ins
19. ssing the UP key The first press displays the default value and any subsequent press alters the value The values will wrap around To select the parameter value and move to the next parameter press DOWN After the final parameter is selected a further press of the DOWN key will exit from the programming mode PARAMETER VALUES Each parameter has a default value that is used when the thermostat is first powered up This value can be changed from within the Installer Setup Mode and once changed it will be stored in the EEPROM so it is not lost in the event of power interruption If the user wishes to restore the parameters to the default values this can be done by changing the temperature scale tS from C to F or F to C and back again PROGRAMMING EXAMPLE To enter the installer setup mode 1 Press to change the temperature setpoint to 10 C 50 F 2 Wait 3 seconds or until the room temperature is dis played 3 Press and hold together until tS is displayed 4 Press once to show the default Temperature Scale value Continue to show all possible values of this parameter in sequence 5 When the desired value is displayed it is selected by pressing once This will also move to the next parameter whose identifier will now be displayed 6 Continue to use to move from one parameter to the next and to alter the parameter value 7 When the last parameter rt has been selected a final press of will retu
20. taller to restrict temperature 1 1 room temp 1 1 room temp Temperature display to set point only With this 0 setpoint only 0 setpoint only parameter the unit will only display the set point temperature Useful where setpoint limits HL and CL will affect control performance and Room Temperature display will disagree with user setpoint T6574B LL Table 6 Leadwire Color Code if fitted Terminal Color Use 1 Black BK L1 Hot 2 White WH L2 N 3 Orange OR Heat 4 Yellow YL Cool 5 Gray GY Damper 6 Violet VI Fan Common 7 Red RD Fan Low 8 Blue BU Fan Medium 9 Brown BN Fan High 10 Energv Mgt 11 System mm HOT N oror ELECTRONICS Tr 3 HEAT COOL 4 VALVE COOL 5 A A 2 to 7 m T ku l oMEDI g IL 4 TAN fir KO H onal setto ott 9 Lio i HAL L d EMS z For power supply provide disconnect means and overload protection required Special service CO ALR solderless connectors must be used when connecting with aluminum conductors Otherwise a fire hazard may result Jumper terminals 4 6 for Auto On fan operation If ventilation damper actuator not used cut off insulate leadwire from Terminal 5 Fig 6 Wiring 2 pipe cool only thermostat with fan On Auto switch 95C 10897 6 T6570 T8570 SERIES DIGITAL FAN COIL THERMOSTATS T6574B
21. the wall OPERATION Control PROPORTIONAL INTEGRAL P l CONTROL Like a mechanical thermostat the T6570 T8570 Series have On Off control output However this output is regulated by a P algorithm enabling the thermostat to control closer to setpoint than conventional thermostats This results in performance where the space temperature is maintained within 0 75 C 1 5 F of the setpoint regardless of fan speed P action minimizes the difference between the temperature setpoint and the effective control point by adjusting the output on time until the control point matches the setpoint The on time is based on a fixed cycle rate of 4 cycles hour for cooling 8 cycles hour for heating and the proportional band is 1 6 C 2 9 F NOTE Integral action corrects the temperature control errors of proportional only control but it is slower to react to large temperature or setpoint changes These thermostats also feature optional built in time delays for equipment protection which can inhibit rapid response to large setpoint changes if active SINGLE STAGE COOLING OR HEATING CONTROL SEE FIG 4 In cooling mode the user setpoint will be positioned at the bottom of the Proportional Band so the setpoint will effectively be the temperature where the cooling switches off In heating mode the user setpoint will be positioned at the top of the Proportional Band and this will be the temperature where the heating switches off NOTE
22. to operate CAUTION Equipment Damage Hazard Improper operation can cause compressor damage Do not operate cooling if outdoor temperature is below 50 F 10 C Refer to manufacturer recommendations To avoid compressor damage allow the compressor to remain off for five minutes before restarting T6570 T8570 SERIES DIGITAL FAN COIL THERMOSTATS 95C 10897 6 T6570 T8570 SERIES DIGITAL FAN COIL THERMOSTATS Automation and Control Solutions Honeywell International Inc Honeywell Limited Honeywell Limit e 1985 Douglas Drive North 35 Dynamic Drive Golden Valley MN 55422 Scarborough Ontario M1V 4Z9 customer honeywell com Honeywell U S Registered Trademark 2005 Honeywell International Inc Printed in U S A on recycled 95C 10897 6 M A Rev 09 05 B paper containing at least 1096 post consumer paper fibers
23. ure is less than 5 C 40 F or over 38 C 100 F the display will return a SF Sensor Failure warning If this warning is not due to a wiring problem it will disappear once the remote sensor or thermostat comes within the 4 5 to 37 8 C 40 to 100 F range If the SF warning is due to a faulty remote sensor connection the thermostat will not transfer measurement to the internal sensor To resolve the faulty connection the thermostat must be powered down the remote sensor connection must be removed or fixed and then the thermostat must be re powered 95C 10897 6 6 Installer Setup Mode The thermostat allows many of its operating parameters to be adjusted via an Installer Setup Mode Each operating parameter has a two letter identifier code which is shown on the display during the Installer Setup Mode programming sequence A description of these is shown in Table 5 PROGRAMMING PARAMETERS The installer setup mode is accessed by reducing the setpoint to 10 C 50 F waiting 3 seconds or until the room temperature is displayed and then pressing the UP and DOWN keys simultaneously for 3 seconds If the installer setup has previously been entered and the Minimum Cooling Setpoint increased above 10 C 50 F the installer setup mode is accessed by reducing the setpoint to the new value before pressing the two buttons The first parameter identifier will be displayed at this point and the parameter value can be changed by pre
Download Pdf Manuals
Related Search