ELECTRONIC THERMOSTAT: T951

Transcription

1 μnistδt ELECTRONIC THERMOSTAT: T9 One floating output One contact output DESCRIPTION The T9 series thermostats are microcomputer-based, proportional and integral (PI) devices with one floating (incremental) output & one contact output. It can be used with most controlled devices in the HVAC industry that are compatible with those signals. A typical application would be to control a floating actuator on a VAV box with an electric duct heater reheat stage. The thermostats also contain five dip switch to adjust the following parameters : Actuator stroke time Cooling or heating applications VAV or valve application Dead band value Direct or reverse acting mode of contact output Type of output Modulating floating On/off N.C. devices On/off N.O. devices HOW TO ORDER T9 - D = Day N = Night Notes: Example: T9D-C In cooling Modulating devices loating damper actuator loating valve actuator DX cooling relay On/off N.C. valve On/off N.O. valve C = C scale = scale In heating Modulating devices loating damper actuator loating valve actuator Duct heater relay Baseboard relay On/off N.C. valve On/off N.O. valve Order changeover sensors such as S, S, S and S separately. Vertical covers are standard. without night mode Lexan cover with: C DAY-NIGHT MODE ( T9N ONLY ) The T9N has a day / night input and an override button and night mode led mounted on the thermostat cover. The night mode, initiated by a remote timer or computer contact, provides energy savings during unoccupied periods of up to 0 %, without sacrificing comfort in occupied rooms. A flashing LED indicates that the thermostat is in Night mode. The occupant may override this condition locally for. hours by pressing the button on the thermostat cover. When output is in Cooling mode Heating mode DIMENSIONS WIRING ROM TOP OR ROM BACK SECURITY SCREW BASE SPECIICATIONS." ( mm ) input activates C (9 ) night setup C (9 ) night setback Operating Conditions: 0 C to C ( to ) 0% to 9% R.H. non-condensing Sensor: Local K NTC thermistor Resolution: ± 0. C ( ± 0. ) Control accuracy: ± 0. C ( ± 0. ) ( calibrated ) Ranges: 0 C to C ( to ) Night setup for cooling mode ( T9N only ): C ( 9 ) night setup Night setback for heating mode ( T9N only ): C ( 9 ) night setback Proportional band for room temperature control: loating output: output: Both outputs:. C (. )." ( mm )." ( mm ) Non isolated triacs: 0 Vac, ½ A max. Isolated triac: 0 Vac, ½ A max.." mm Power: -%, +0% / Hz; VA Issue Date: May, R

2 MODULATING LOATING This output is designed to give true PI modulation out of floating actuator for VAV dampers and valves. The tri-state output has dip switch located inside the thermostat which sets the maximum running time of the tri state actuator being used. Proper setting will give performances equal to more expensive modulating analog devices. Suitable for many brands of actuator, different time settings are available. or VAV applications ( S switch to off / S=0 ) The available selections for the actuator timing switch on the tri-state output are mostly for VAV damper actuator applications. Switch # Actuator maximum timing range.0 to.0 off ( S=0 ) minutes Switch # on ( S= ) Actuator maximum timing range. to. minutes or valve applications ( S switch to on / S= ) The available selections for the actuator timing switch on the tri-state output are mostly for valve actuator applications. Switch # Actuator maximum timing range.0 to.0 off ( S=0 ) minutes Switch # on ( S= ) Actuator maximum timing range 0. to.0 minutes The output is normally cooling but can be reversed to heating mode with different methods: An internal dip switch reverses the output to a fixed heating mode Auto changeover to heating mode with a supply sensor. A remote sensor can be used for each thermostat.( S or S or S ) Supply temperature > ( C) = heating mode Supply temperature < ( C) = cooling mode Hysterisys is ( C) Auto changeover to heating mode with a dry contact. A closed contact on the changeover input will change operation of the floating output to heating mode. contact = cooling mode d contact = heating mode Characteristics of changeover sensor KΩ. ( S, S or S ) Temperature Temperature C Sensor resistance.0. C 9.0 Kohm C.0 Kohm 0.0. C. Kohm C. Kohm 0.0. C.90 Kohm C. Kohm.0. C. Kohm.0. C. Kohm.0. C. Kohm.0. C. Kohm C 9.0 Kohm 0.0. C.9 Kohm VAC CONTACT This output is designed to give true PI time proportioning modulation out of position on/off relays or valves. This time proportioning modulation gives a much more precise temperature control than conventional mechanical on / off thermostats with anticipator. When stabilized, the thermostats will cycle the end device ( relay or valve ) times per hour with a duty cycle that varies with demand. The output can be used for heating or cooling applications with N.O or N.C. devices depending on dip switch setting. THERMOSTAT INSTALLATION Important. Electronic controllers require special care for wiring and startup. To avoid problems, carefully follow the procedures below. Be sure to have all the literature on hand for all components installed: controller, actuators, relay, etc... Look at the wiring diagrams, and study them carefully. Be sure that you understand how the system is supposed to work. Make the wiring according to the wiring diagrams. Respect polarity for power terminals # & # between multiple controllers if the same transformer is used. Remove security screw on left side of thermostat cover. up by pulling on the bottom side of thermostat. A) Location: - Shouldn t be installed on outside wall. - Must be installed away from any heat source. - Shouldn t be affected by direct sun radiation. - Nothing must restrain vertical air circulation to the thermostat. B) Installation: - Pull out cables out of the wall. - Wall surface must be flat and clean. - Separate the thermostat and the base by pulling the cover by the bottom (same as the security screw.) - Insert cable in the central hole of the base. - Align the base and mark the location of the two mounting holes on the wall. Install proper side of base up. - Install shields in the wall. - Insert screws in mounting holes on each side of the base. DO NOT OVERTIGHTEN! - Strip each wire / inch. 9- Insert each wire according to wiring diagram. 0- Reinstall the cover ( top side first ) and gently push back extra wire length in the hole in the wall. - Install security screw.

3 DIP SWITCH ADJUSTMENTS PER APPLICATIONS S O O S O ON APPLICATION SWITCH ACTUATOR TIMING OR ULL STROKE & CONTACT HEAT / COOL ACTION Generally for VAV room control applications Actuator maximum timing range.0 to.0 minutes output operates in heating mode Actuator maximum timing range. to. minutes output operates in heating mode Generally for valve room control applications S O CHANGEOVER O LOATING loating output is cooling (DA) Auto changeover of output to heating mode (RA) with a supply sensor or, Auto changeover to heating mode (RA) with a dry contact ON ON O ON Actuator maximum timing range.0 to.0 minutes output operates in cooling mode Actuator maximum timing range 0. to.0 minutes output operates in cooling mode ON Reverses the floating output to a fixed heating mode (RA) S DEAD BAND S APPLICATION SWITCH OR THE CONTACT OUPUT O (. C ) O or positions N.C. valve or positions electromechanical relay ON (. C ) ON or positions N.O. valve CONTROL CURVES AND SEQUENCE Application switch S = 0 loating output in cooling mode, changeover not activated output in heating mode on CONTACT off SETPOINT DIAL CENTERED IN DEAD BAND LOATING opened Application switch S = loating output in cooling mode, changeover not activated output in cooling mode SETPOINT DIAL CENTERED IN DEAD BAND off CONTACT opened on closed closed LOATING DEAD BAND Temperature increase DEAD BAND Temperature increase Application switch S = 0 loating output in heating mode, changeover activated output in heating mode Application switch S = loating output in heating mode, changeover activated output in cooling mode on CONTACT SETPOINT DIAL CENTERED IN DEAD BAND SETPOINT DIAL CENTERED IN DEAD BAND opened off opened on LOATING closed LOATING closed off CONTACT DEAD BAND Temperature increase DEAD BAND Temperature increase

4 TYPICAL APPLICATIONS Pressure Dependent VAV With: On/Off Electric Reheat Dip switch position S S S S S maximum timing range.0 to.0 minutes. ( deadband ) maximum timing range. to. minutes. ( deadband ) O O O O O O ON O O O Modulating loating VAV Actuator & On/Off Duct Heater Room Temperature Control Minimum & Maximum Position Adjusted on the actuator C Pressure Dependent VAV With: Cool / Heat Auto Input & On/Off Electric Reheat Dip switch position S S S S S Cool/heat auto changeover input or an actuator with maximum timing range.0 to.0 minutes ( deadband ) Cool/heat auto changeover input or an actuator with maximum timing range. to. minutes ( deadband ) O O O O O O ON O O O Supply air temperature sensor Modulating loating VAV Actuator Heating and/or Cooling & On/Off Duct Heater Sensor Room Temperature Control Minimum & Maximum Position Adjusted on the actuator C

5 Valve Control Room With: On/Off Electric Reheat Dip switch position S S S S S maximum timing range.0 to.0 minutes. ( deadband ) maximum timing range. to. minutes. ( deadband ) O O O O O O ON O O O C Modulating Cooling loating Valve & On/Off Duct Heater Room Temperature Control Valve Control Room VAV With: Cool / Heat Auto Input & On/Off Electric Reheat Dip switch position S S S S S Cool/heat auto changeover input or an actuator with maximum timing range.0 to.0 minutes ( deadband ) Cool/heat auto changeover input or an actuator with maximum timing range. to. minutes ( deadband ) O O O O O O ON O O O C Modulating loating Valve Heating and/or Cooling & On/Off Duct Heater Optional Water Supply Sensor Room Temperature Control Supply water temperature sensor

6 Valve Control Heating Only With: Stage On/Off DX Cooling Dip switch position S S S S S maximum timing range.0 to.0 minutes. ( deadband ) maximum timing range 0. to.0 minutes. ( deadband ) Modulating Heating loating Valve & On/Off DX Cooling D ON O ON O O ON ON ON O O an is always on X D RC Y X Room Temperature Control VAC POWER, CONTACT AND LOATING ACTUATOR TYPICAL WIRING SAME TRANSORMER TO POWER THE END DEVICE CONNECTED TO THE CONTACT SEPARATE TRANSORMER TO POWER THE END DEVICE CONNECTED TO THE CONTACT output Va. R On/off device Install actuator per thermostat Modulating floating actuator / type output Va. On/off device R Install actuator per thermostat Modulating floating actuator / type Power Supply -% +0% / HZ VA If operation of the actuator is reversed, flip the reversing switch on the actuator or reverse wires # & #. Always select an actuator timing which is slightly less than the true maximum running time the actuator Note: terminals,, and can be wired together between each thermostat if polarity is respected Important: if using a common transformer, respect polarity ( and between thermostats and actuator )

7 CHANGEOVER INPUT TYPICAL WIRING MULTIPLE TRANSORMERS ( DRY CONTACT OR ALL THERMOSTATS ) contact = Cooling mode. d contact = Heating mode Transformer Primary Transformer Primary Do Not Ground Any Transformer To Earth Input Input Cool / Heat SINGLE TRANSORMER ( DRY CONTACT OR ALL THERMOSTATS ) contact = Cooling mode. d contact = Heating mode Primary Transformer Input Input Cool / Heat SUPPLY CHANGEOVER SENSOR PER THERMOSTAT ( SUPPLY SENSOR PER THERMOSTAT ) Auto changeover input using an S, S duct supply sensor or S immersion supply sensor Supply temperature > ( C) = Heating mode Supply temperature < ( C) = Cooling mode Hysterisys is ( C) between heating and cooling Cool / heat automatic changeover input S or S Duct OR S Immersion

8 INPUT TYPICAL WIRING ( T9N ONLY ) MULTIPLE TRANSORMERS d = night mode. contact can be used for all thermostats on the same transformer. Transformer Primary Transformer Primary Do Not Ground Any Transformer To Earth Mode Input Mode Input Mode SINGLE TRANSORMER d = night mode. contact can be used for all thermostats on the same transformer. Primary Transformer Mode Input Mode Input Mode Viconics Electronics Inc. 9, Langelier Blvd, St-Leonard, Quebec, Canada HP K LIT-T9X-E0.doc LIT-T9X-E0