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  • Description of Temperature Control Applications Heater ... · 11), power is supplied to the damper motor (MT-02), if equipped. When the damper motor approaches the OPEN position (approximately
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Building Management Signal/0-10VDC or 4-20mA Signal Conditioner/Blower-Heat- Cool Relays (Modular) Description of Temperature Control • Signal Conditioner for temperature control • Conditioner accepts 0-10VDC or 4-20mA signal from BAS System • Discharge Sensor Mounted in Blower • All necessary safeties provided integral to the unit Applications Where tempered make-up air is required for a building with a Building Automation System and the controller is provided by others. Heater Type 100% Outside Air Single Speed or Variable Air Volume (VAV) Unit Sequence of Operations With the disconnect in ON position and contact closure from an external source to the BAS blower relay (RE- 11), power is supplied to the damper motor (MT-02), if equipped. When the damper motor approaches the OPEN position (approximately 70%), the damper-end switch (SW- 03) closes energizing the blower motor starter contactor (ST-01) and powering the blower motor (MT-01). If the unit is equipped with the low-temperature limit control (TS-01), after ten minutes, the low-temperature limit control shuts down the unit if the discharge temperature does not reach the minimum set-point on the low-temperature limit control. If the unit is equipped with a smoke detector (TS-07), the smoke detector will shut down the unit if smoke is detected. If the unit is equipped with a clogged filter switch (PS-05), the pressure drop across the filters will be monitored. The low airflow switch (PS-01) and the high airflow switch (PS-02) must be proven. The intake air sensor (TS- 03) will then either switch on the heating circuit or switch to the cooling interlock with the BAS cooling relay (RE-13). If the intake air sensor calls for heat, the BAS burner relay (RE-12) is energized from an external source and the high temperature limit switch (TS-02) is not activated, the Fireye flame safety control (FSC- 01) will monitor the flame via the flame rod (FR-01) and send a signal to the spark plug and pilot gas valve (VA-01). (Note: the high temperature limit switch will monitor the air temperature and shut down the burner if the temperature set point is exceeded. The high temperature limit will require a manual reset.) If equipped with the modular packaged unit option, and the intake air sensor (TS-03) does not call for heat, the BAS cooling relay is energized, and the cooling thermostat (TS-06) calls for cooling, the compressors will be energized. The first stage of cooling will be factory set to activate at 85 °F and the second stage will activate if the ambient air temperature rises another 10 °F above the first stage of cooling.

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Page 1: Description of Temperature Control Applications Heater ... · 11), power is supplied to the damper motor (MT-02), if equipped. When the damper motor approaches the OPEN position (approximately

BuildingManagementSignal/0-10VDCor4-20mASignalConditioner/Blower-Heat-CoolRelays(Modular)

DescriptionofTemperatureControl

• SignalConditionerfortemperaturecontrol• Conditioneraccepts0-10VDCor4-20mAsignalfromBASSystem• DischargeSensorMountedinBlower• Allnecessarysafetiesprovidedintegraltotheunit

ApplicationsWheretemperedmake-upairisrequiredforabuildingwithaBuildingAutomationSystemandthecontrollerisprovidedbyothers.

HeaterType100%OutsideAirSingleSpeedorVariableAirVolume(VAV)Unit

SequenceofOperationsWiththedisconnectinONpositionandcontactclosurefromanexternalsourcetotheBASblowerrelay(RE-11),powerissuppliedtothedampermotor(MT-02),ifequipped.

WhenthedampermotorapproachestheOPENposition(approximately70%),thedamper-endswitch(SW-03)closesenergizingtheblowermotorstartercontactor(ST-01)andpoweringtheblowermotor(MT-01).

Iftheunitisequippedwiththelow-temperaturelimitcontrol(TS-01),aftertenminutes,thelow-temperaturelimitcontrolshutsdowntheunitifthedischargetemperaturedoesnotreachtheminimumset-pointonthelow-temperaturelimitcontrol.

Iftheunitisequippedwithasmokedetector(TS-07),thesmokedetectorwillshutdowntheunitifsmokeisdetected.

Iftheunitisequippedwithacloggedfilterswitch(PS-05),thepressuredropacrossthefilterswillbemonitored.

Thelowairflowswitch(PS-01)andthehighairflowswitch(PS-02)mustbeproven.Theintakeairsensor(TS-03)willtheneitherswitchontheheatingcircuitorswitchtothecoolinginterlockwiththeBAScoolingrelay(RE-13).Iftheintakeairsensorcallsforheat,theBASburnerrelay(RE-12)isenergizedfromanexternalsourceandthehightemperaturelimitswitch(TS-02)isnotactivated,theFireyeflamesafetycontrol(FSC-01)willmonitortheflameviatheflamerod(FR-01)andsendasignaltothesparkplugandpilotgasvalve(VA-01).

(Note:thehightemperaturelimitswitchwillmonitortheairtemperatureandshutdowntheburnerifthetemperaturesetpointisexceeded.Thehightemperaturelimitwillrequireamanualreset.)

Ifequippedwiththemodularpackagedunitoption,andtheintakeairsensor(TS-03)doesnotcallforheat,theBAScoolingrelayisenergized,andthecoolingthermostat(TS-06)callsforcooling,thecompressorswillbeenergized.Thefirststageofcoolingwillbefactorysettoactivateat85°Fandthesecondstagewillactivateiftheambientairtemperaturerisesanother10°Fabovethefirststageofcooling.

Page 2: Description of Temperature Control Applications Heater ... · 11), power is supplied to the damper motor (MT-02), if equipped. When the damper motor approaches the OPEN position (approximately

Ifequipped,theoptionallowandhighgaspressureswitches(PS-03&PS-04)willbeenergized.Ifthegaspressureisnotbetweentheset-pointstheburnerwillturnoffandrequireamanualreset.

Ifanexhaustfanstartercoilistiedintotheexhaustfaninterlock(RE-E),theexhaustfanwillturnon.

Aftertheflamerod(FR-01)provesflamethemainvalve(VA-02)opens.Iftheflameroddoesnotproveafter3ignitioncycles,theburnerwillshutoff.

Thetemperaturecontrolsystem’samplifier(MA-01)receivestwosignals;onefromthedischargesensor(TS-05)andonefromanexternal0-10VDCor4-20mAsignalfromtheBuildingAutomationSystem.TheamplifiercontinuallycomparesthesesignalsandwhenheatisrequiredtheamplifierwillsendaDCvoltagetothemodulatingvalve(VA-03).AstheDCvoltagefromtheamplifierincreasesthemodulatingvalvewillopen,allowingmoregastoflow.Bycomparingthetwosignalstheamplifierwillmaintainthedischargetemperaturebysendingasignaltothemodulatinggasvalve.

AdditionalSequenceofOperationforVAVunits

VAVwithStaticPressureControl

TheVFDisenergizedafterthedampermotorswitch(SW-03).

Thephotohelic,usedtomonitortheindoorairpressure,sendsasignaltotheVFDprovingthattheindoorpressureissatisfied,positive,ornegative.Basedonthissignal,theVFDalterstheHZtotheblower.Dependingonthesignalfromthephotohelic,theVFDwilldothefollowing:

• Ifthespaceissatisfied,theVFDwillmaintaincurrentoperation• Ifthespaceisnegative,theVFDwillrampuptorebuildthepressureinthespace• Ifthespaceispositive,theVFDwillmodulatedowntoreducethepressureinthespace

VAVwithManualPotentiometer

TheVFDisenergizedafterthedampermotorswitch(SW-03).

ThemanualpotentiometeraltersthespeedoftheVFDbyalteringtheHZtotheblower.

VAVwithConstantSpeedControlorAnalogInputControl

TheVFDisenergizedafterthedampermotorswitch(SW-03).

TheVFDcanoperatebyeitherananaloginputorpresetspeeds.

Ifanaloginputisrequired,ananaloginputsignalissenttotheVFDbyanexternalsource,whichwilldirectlycontrolthesignaltotheblower.

Ifpresetspeedsarerequired,anexternalswitchcanbeusedtomanuallyadjustbetweenprogrammedspeedsintheVFD.TheVFDwillsendasignaltotheblower.


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