Occupancy Sensor HVAC Control - Network Thermostat€¦ ·  · 2016-07-26Occupancy Sensor HVAC Control 1. ... that are easy for the HVAC unit to obtain the desired occupied set points

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OccupancySensorHVACControl

1. Installthermostatbackplateandconnecttonetworkperthermostatinstallationinstructions

2. Pull4-conductorcable(orCAT5)fromthermostattooccupancysensorlocationandwireaccordingtothediagramsbelow.

a. SingleOccupancySensorConnectedtoThermostat

b. MultipleOccupancySensorsConnectedtoThermostat

Inadaisychainfashion,connectall24Vtogetherandthenall24Ctogetherasshown.Daisy-chainfromCLK2toCOMonthefirstsensor,thenNCtotheCOMofthesecondsensor,etc.Onthelastsensorinthechain,connecttheNCtoCLK1usingthefourthconductorbyconnectingeachsegmentwithawirenutasshownabove.*NOTE:Itmayberequiredtoaddaseparate(orlarger)24vactransformertopowermorethanoneoccupancysensor.Ifso,thermostatsandoccupancysensorsmusthavethesame24VAC/24V(c)polarityonallunits.75VAtransformerrecommended.

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c. EnsurebothjumpersareatpositionAandperformWalkByTestperoccupancysensorinstallation

instructions

NT-OSCCeilingMountSensorWalkByTestJumperSettings

NT-OSWWallMountSensorWalkByTestJumperSettings

3. UpdateOccupancySensorandthermostatforHVACcontrol

a. RecommendsetthermostatOverrideTimerto10minutes,orlonger.OverrideTimermustNOTbe0:00.(inconfigurationpage)

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4. UpdateOccupancySensorjumpersettingsforHVACcontrol

a. SetVerify(ON)(OccupancyDetection)tojumpersettingE(5minutes)

b. SetMinimumOccupied(OFF)(HVACRunTime)tojumpersettingsE(20minutes)orF(30minutes).

ThermostatoverridewillcontinuefordurationofMinOcc(OFF)time.

NOTES:WhenchangingOccupancySensorjumpersettings,recycleOccupancySensorpowerbyremovingandreattachingthethermostatfaceplate

5. Securecoveronoccupancysensor

6. SetdipswitchesonbackofthethermostatfaceplatetoturnoffAdaptiveRecovery(#2ON)ifdesired(but

notrequired)andengagetheLockout(#4ON)(required).

7. Placethermostatfaceplateonthermostatbackplate

8. SetOccupied&Unoccupiedschedulea. SetOccupiedscheduleto30minutesbeforeanticipatedoccupiedtime(orHVACruntimesothat

thespaceisatthedesiredoccupiedsetpoint).

b. SetanUnoccupiedscheduleto30minutesafteranticipatedoccupiedtime.UsesetbacksetpointsthatareeasyfortheHVACunittoobtainthedesiredoccupiedsetpointsduringnormaloccupiedhours.

OccupancyControlDipswitchSettings

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c. Seta2ndUnoccupiedscheduleto30minutesafternormaloccupiedhours.Usesetpointsthatwillmaximizeenergysavingsduringunoccupiedhours.

Summary:TheprecedinginstructionsconfiguredtheHVACequipmentforoccupancysensorcontrol.Thisscenarioassumesaclassroomsettingwithastarttimeof8:15.Theteacherarrivesat8amsopreconditioningbegins30minutespriorat7:30am.Iftheroomremainsunoccupied,theschedulesetstheHVACto“light”setback(unoccupied)modeat8:30am.Attheendoftheday,thethermostatwillsettheHVACintoa“heavy”setback(unoccupied)modeat5:30pm.

1. TheareawillbepreconditionedtotheOccupiedSetPoints(cool=74oF,Heat=68oF)beginning30minutespriortoanticipatedroomoccupancyof8am.

2. Ifnooccupancyisdetectedduringnormaloccupiedhours,theschedulewillsettheHVACequipmentintoUnoccupied(orlightsetback)mode(cool=78oF,heat=65oF)30minutesafteranticipatedroomoccupancyof8am.UsealightsetbacksuchthattheHVACunitcaneasilyreachdesiredoccupiedsetpointsduringnormallyoccupiedhours.

3. Ifnooccupancyisdetectedduringnormalunoccupiedhours,theschedulewillsettheHVACequipmentintoUnoccupied(orheavysetback)mode(cool=85oF,heat=60oF)30minutesafteranticipatedroomoccupancyof5pm.Useaheavysetbacktomaximizeenergysavingsduringnormallyunoccupiedhours.

4. Ifoccupancyisdetectedatanytime,theHVACequipmentwillcontinueconditioningtheareainOverrideusingthatlastrunOccupiedsetpointsforthedurationofroomoccupancy.

5. TheOverride(Occupied)modewillcontinueforamaximumof20minutesaftertheroomisvacated.

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6. IfthethermostatisinUnoccupiedMode,aminimumof6minutes(intheexample)ofcontinuousoccupiedtimeisnecessarybeforetheoccupancysensorwillplacethethermostatbackintoOverride(Occupied)Mode.

Notes:a. TheOccupancysensorwilltriggeranOverride(HVACconditionstoOccupiedsetpoints)whenthe

integratedoccupancysensorrelayOPENS.AnOverridewillconditionthespacetothelastrunoccupiedsetpoints.

b. ThethermostatmustrecognizethatanOccupancySensorisconnectedtotheCLK1&CLK2terminalsbydetectingashortbetweenCLK1&CLK2(i.e.theOccupancysensormustNOTdetectoccupancyatleastonetimewiththethermostatfaceplateONbeforethethermostatrecognizesthattheoccupancysensorisconnected).

c. Verify(ON)(occupancydetection)hasabuiltindelayof1minute.Thus,ifVerify(ON)issetto5

minutes,theOccupancySensorwillactivateanOverrideafter6minutesofcontinuousoccupiedtime.

d. Ifatimedelayrelayisbeingusedasadoorcontactorinconjunctionwiththeoccupancysensor,

ensurethattherelayisnormallyOPENwhenthedoorisclosed.