402M • Series 14 Remote Panel with S/O/W Switch, Lights & 40-80°F Dial & Room Override (Modular) Description of Temperature Control • 402M-Maxitrol Series 14 Electronic Modulating Discharge Temperature Control with Remote Panel and Room Override Thermostat • Single Range - 40°F to 80°F Discharge Temperature Set-Point Mounted in Remote Panel, Room Override Mounted in Separate Remote Panel • Discharge Sensor Mounted in Blower • Discharge Remote Panel Includes Summer/Off/Winter Switch, and Indicator Lights Applications Where tempered make-up air is required for both indoor air quality and to replace an exhaust load in a facility where a primary heating source is already in place. Heater Type 100% Outside Air Single Speed or Variable Air Volume (VAV) Industrial Unit Sequence of Operations With the disconnect in ON position and the SUMMER/OFF/WINTER switch (SW-04) in WINTER position, 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). After the blower is energized the “Blower On” light (LT-01) will illuminate on the remote panel. 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. Upon shutdown TS-01 will energize the “Low Temperature” light on the remote panel (LT-05) and the damper will close.
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402M•Series14RemotePanelwithS/O/WSwitch,Lights&40-80°FDial&RoomOverride(Modular)
DescriptionofTemperatureControl
• 402M-MaxitrolSeries14ElectronicModulatingDischargeTemperatureControlwithRemotePanelandRoomOverrideThermostat
• SingleRange-40°Fto80°FDischargeTemperatureSet-PointMountedinRemotePanel,RoomOverrideMountedinSeparateRemotePanel
• DischargeSensorMountedinBlower• DischargeRemotePanelIncludesSummer/Off/WinterSwitch,andIndicatorLights
ApplicationsWheretemperedmake-upairisrequiredforbothindoorairqualityandtoreplaceanexhaustloadinafacilitywhereaprimaryheatingsourceisalreadyinplace.
HeaterType100%OutsideAirSingleSpeedorVariableAirVolume(VAV)IndustrialUnit
SequenceofOperationsWiththedisconnectinONpositionandtheSUMMER/OFF/WINTERswitch(SW-04)inWINTERposition,powerissuppliedtothedampermotor(MT-02),ifequipped.
WhenthedampermotorapproachestheOPENposition(approximately70%),thedamper-endswitch(SW-03)closesenergizingtheblowermotorstartercontactor(ST-01)andpoweringtheblowermotor(MT-01).Aftertheblowerisenergizedthe“BlowerOn”light(LT-01)willilluminateontheremotepanel.
Iftheunitisequippedwiththelow-temperaturelimitcontrol(TS-01),aftertenminutes,thelow-temperaturelimitcontrolshutsdowntheunitifthedischargetemperaturedoesnotreachtheminimumset-pointonthelow-temperaturelimitcontrol.UponshutdownTS-01willenergizethe“LowTemperature”lightontheremotepanel(LT-05)andthedamperwillclose.
Iftheunitisequippedwithasmokedetector(TS-07),thesmokedetectorwillshutdowntheunitifsmokeisdetected.
Ifanexhaustfanstartercoilistiedintotheexhaustfaninterlock(RE-E),theexhaustfanwillturnon.
Iftheunitisequippedwithacloggedfilterswitch(PS-05),thepressuredropacrossthefilterswillbemonitored.Ifthepressuredropexceedstheset-point,PS-05willilluminatethe“CloggedFilter”lightontheremotepanel(LT-06).
Thelowairflowswitch(PS-01)andthehighairflowswitch(PS-02)mustbeprovenbeforetheFireye(FSC-01)canbeenergized.Therealsomustbeacallforheatfromtheintakeairsensor(TS-03)andthehightemperaturelimitswitch(TS-02)mustnotbeactivated.TheFireyeflamesafetycontrolwillmonitortheflameviatheflamerod(FR-01)andsendasignaltothesparkplugandpilotgasvalve(VA-01).
(Note:thehightemperaturelimitswitchwillmonitortheairtemperatureandshutdowntheburnerifthetemperaturesetpointisexceeded.Thehightemperaturelimitwillrequireamanualreset.)
(Note:whentheremotepanelisinSUMMERpositiontheburnerislockedout)
Ifequippedwiththemodularpackagedunitoption,andtheintakeairsensor(TS-03)doesnotcallforheat,andthecoolingthermostat(TS-06)callsforcooling,thecompressorswillbeenergized.Thefirststageofcoolingwillbefactorysettoactivateat85°Fandthesecondstagewillactivateiftheambientairtemperaturerisesanother10°Fabovethefirststageofcooling.
Ifequipped,theoptionallowandhighgaspressureswitches(PS-03&PS-04)willbeenergized.Ifthegaspressureisnotbetweentheset-pointstheburnerwillturnoffandrequireamanualreset.
Afterthepilotgasvalveopensthe“BurnerOn”light(LT-02)willilluminateontheremotepanel.Aftertheflamerod(FR-01)provesflamethemainvalve(VA-02)opens.Iftheflameroddoesnotproveafter3ignitioncycles,theburnerwillshutoffandthe“FlameFailureLight”(LT-03)willilluminateontheremotepanel.
Thetemperaturecontrolsystem’samplifier(MA-01)receivestwosignals,onefromthedischargesensorandonefromtheremotepanel.Theremotepanelsendsasignalbasedeitheronthesetpointfromtheremotepanelorfromtheroomthermostat(TS-07).TheamplifiercontinuallycomparesthesesignalsandwhenheatisrequiredtheamplifierwillsendaDCvoltagetothemodulatingvalve(VA-03).AstheDCvoltagefromtheamplifierincreasesthemodulatingvalvewillopen,allowingmoregastoflow.Iftheroomthermostatisnotsatisfied,ahighfiresignaloverridestheremotepanelsetpointforcingtheunitintohighfireuntilthespacetemperaturethermostatissatisfied.
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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