Section 23 52 16 Condensing High Efficiency Cast Iron Hydrotherm Kn-Series Boilers

KNSP4-8 6. Manual Reset High Limit (CSD-1 Factory Mounted and Wired)

7. Low Gas Pressure SafetyKN-6, Switch KN-10, KN-16, KN-20, KN-26, KN-30 2.21.4PARTB.G. COMPONENTSQUALITY Manufacturer’sPARTStart 2 5.6.- pumpsPRODUCTS Adaptive3Safety When19.- ASSURANCEEXECUTION and Failsafe Devices: using representativeModulation boilers, the mode Low Heat-Netand – gasLowersadjust whenshall pressure protocol, supplyburners athe Building modulation a switch, thetofactory maximum system Management air-flowauthorized rate setpoint ofoperating switch,all currently service Systemshall efficiency.and be technician operating blocked (BMS)sent from flueis toboilers thestart controlling detection “Master”, upbefore the switch,boilers.a setpoint.along newly withlow If 8.addedwater Lowthecommunications Watercutoff boiler modulation (manual Cutoffenters with operation.value reset),is lost,Manual to highthe control boiler/systemReset temperature firing (CSD-1 rate. manualshall Factory It also run reset. mountedoffreceives the All Local safeties andits Setpoint. commandwired) to be factory to start mounted. or stop over the SECTION 23 52 16 – CONDENSING HIGH EFFICIENCY CAST IRON HYDROTHERM KN-SERIES 2.13.1PARTA. MANUFACTURERSEXAMINATION ListingCombustion 1 1- GENERAL andHeat-Net Labeling: FillChamber: out cable. startup Provide The Each checklist combustion electrically “Member” and chamber attachoperatedwill continuously copy shall components with be Contractor constructedmonitor specified its Startup supply of incast-iron. thisReport. outlet Section temperatureIt shall that be are a down-firedagainstlisted and its 9. Supplyoperating Outlet limit. Temperature If the supply Display temperature approaches the operating limit temperature (adjustable), 3.5designlabeled. CLEANING 6.utilizing Priority20. Supportlightweight Firing –for Allows refractorydomestic mixing aroundhot of water condensing, the (DHW) burner non-condensingusinghousing. a 10k sensor base-load or a dry and/or contact other input combination from a tank of the boilers input control rate is limited and its modulation value decreases to minimize short cycling. (2)2 functionalthermostatCheck boiler and typesrecorda domestic utilizing performance hot (2) water priority of relay factory-provided levels. (pump/valve) boiler protection devices and firing sequences. 1.1A. RELATED AvailableExamine10. FullIf Digital theDOCUMENTSareaManufacturers: operating toText receive Display limit Manufacturerboiler is for exceeded, all for Boiler compliance shalltheSeries boiler be of with a Operationshall company requirements shut off.and specializing Failures for installation in manufacturing tolerances the and products other B.A.specifiedconditions FlushHeat1 and Exchanger:in affecting thiscleanThe section boilers Termsboiler Boilers with onperformance.“Listed” completion shallminimum and be a“Labeled”: five Doof cast installation, not(5) iron yearsproceed As sectional defined experience.according with in unitinstallation NFPA to designed Subjectmanufacturer’s 70, Articleuntil to for complianceunsatisfactory 100. pressure written firinginstructions.with conditions requirements,and shall have be A.I.constructedmanufacturersbeen Optional11. corrected.7.3 AirDrawings Available 21.DualInlet and ContinuousCheckoffering FiltertestedFuel andpriority Capacity:and forgeneralboilers start/stop100recordDaily P.S.I thatprovisions (KN-26Runtime performance qualifierswatermay & Restartbe working30of incorporatedtheshallonly) of boilerContract,feature pressure, beif/when done fluid-level, that into includingusingscheduled in monitors accordancethe anyflow-switch Work General combination the include,runtime boilerwith (optional),and the shall Supplementaryof:ofbut A.S.M.E. eachA) includeare andModulation boilernot high-temperature Section a limited gasand Conditions trainIVif to,any Rules andthe in following:interlocks. B.andcombustionfor Afterthe Division Percentage2Construction completingEachthe system 1 SpecificationnetworkListing Heat-Net B) capableofboiler Outdoor and Heatinghave controlLabelinginstallation, Sections, ofexceeded Airdual Boilers. inTemperature fuelAgencythe apply 24 including boilerIndividualoperation. hours toQualifications: networkthis or ofoutlet C)sections Section.Thecontinuous Return shall dualfittings A will have Waterfuel“Nationally runtime, andhave boilerthe Temperature. devices, beenfollowing shallthe Recognized subjectedboiler be inspect standard able is restarted to Testingtoexposed operate features:a hydrostatic Laboratory”to finish.onprotect both pressureRemove the natural as UV defined test of 250 PSIG at the factory before shipment and they shall be marked, stamped or cast with the A.S.M.E. 3.2burrs,gas INSTALLATION 12.and dirt,in Combustion propane.OSHA andflame construction Regulation scanner. The Air boilerFan 1910.7. debriswith efficiency Safety and repair Interlockand turndown damaged shall finishes remain including constant chips, regardless scratches, of andfuel abrasions selection. withThe dualCode fuel symbol.4 combustion BoilersOperate system with boilers less shall asthan incorporaterecommended 250-psi pressure individual or required test natural will by not gasmanufacturer. be and acceptable propane gasfor this trains, project. which The will sectionsmeet all 1.2B.manufacturer's SUMMARY Design:8. Base 1.Boilers Digital Loadingstainless shallCommunications – steel beProvides CSA polish. designthe Control. ability certified to control as (1)a condensing base load boiler boiler. with Boilers enable/disable shall be anddesigned 4-20mA for a applicableshall be of national a down and fired local counter codes flow and single-pass standards. design. The dual Water fuel systemports will shall be havesealed a fuelwith selectorsteel push switch nipple for minimummodulating of 5:1 continuous signal (if required). turn down with constant CO2 over the turndown range. The boiler shall operate automaticconnectors.B.A. ASMEInstall13. Condensate boilersCompliance: fuel22. The changeover.Allows levelsections Drain andfor Boilers selection willplumb, There be shall fully according shallof bear anymachined beASME boiler noto manufacturer’smanual in“H”for the metalstamp network fuel to and changeover metal written tobe act National-Boardsealing as instructions Leaddevices of theBoiler. incorporatedgas andlisted. side referenced surfaces. with standards. the The dual design fuel with natural gas and have a CSA International certified input rating as noted on the drawings, and a thermal 3.6system.A.H.will COMMISSIONING Performprovide This The forthe Section switchingequalA. following Boiler temperatureincludes to mechanismtests Boiler: gas-fired, for rise Heat-Net maximum through shall condensing be andall designedsections. minimum cast-iron The so firingboilers thereiron ratesshall for is heating nohavefor modulating possibility a hotminimum water. ofburner. thickness both Adjust fuels of ¼". flowingboiler The efficiency rating up to 99% at minimum input. The boiler shall be symmetrically air-fuel coupled such that C.simultaneously.combustionheat FM14. exchanger Compliance: MASTER:High23. efficiencyGas Adaptive designThe PressureA Control boiler atshould Modulation maximum shallSwitchdevicesbecomes have be (KN26/30) andfeatureno commissioned anda limitations Mastercontrol minimum in which sequenceswhen on and modulationthetemperature a calibratedresistanceMaster according boiler rates. rise totype to runadjustsor Performrequirements 10K restrictionson both sensorthe combustion systemfuel to isof sourcesinlet connectedFM. modulation water flue at temperature gasstart-up. to rate the test toJ10 No ata changes in combustion air flow or flue flows affect the BTUH input without affecting combustion quality. The additionalminimumand a Cv“SYS/ of andre-calibrationlower 60 DHW maximum (KN-6), value HEADER” when100 shallmodulation (KN-10), bea terminals. new required rate.boiler 160 The Measurewhen(KN-16), in thesensor switching network and190 shall record(KN-20), fuelis be started systems theauto 240 following: todetected (KN-26) compensateuntil the .and The next 278 Masterfor annual (KN-30).the addedsenses service BTU’s and date controls tofor the the boilerB.A. InstallEngage willRelated gas-fired automatically a factory-authorizedB. Sections Buildingboilers adjust accordinginclude Management input service the forto following: NFPA altituderepresentative System 54. and (BMS): temperature to MODBUSprovide inducedstartup standard service.changes protocol. Start in air (BACnet,up density. to be performed LONThe boilerWORKS only will boiler.15. the Flow header/loopsystem. Switch Once Mounted temperature the newly& Wired utilizingadded boilera system fi res setpoint. and the It adjustableuses any boilers timer expire,it finds the“Heat-Net Master Members” resumes useD.after Comply a complete proven with pilot andNFPA boiler N2interrupted 70 room optional for electrical operation spark protocols) componentsignition is field system. verified and Theinstallation. to boiler offer ashall substantial use a UL load, approved and completeflame safeguard system or thosecontrol defined of the in system the control modulation setup menusto maintain to accomplish setpoint temperature. this. The “Master” shall also have the option C.ignitioncirculation. Support1 control One-yearboilers DifferentialDivisionsystem on warranty a 23usingminimum pressureSection UVshall 4-inch- detection“Breechings, beacross handled (100-mm-) air flame / bygas Chimneys, factory sensing.orifice. thick authorized concrete and The Stacks” UV base, tech. detector for 4 connections inches shall (100be toair mm) breechings, cooled larger to on preventchimneys, each 16.of Relief monitoring Valve (loose)Outside Air Temperature “OA” to provide full outdoor air reset functionality. Only one sidecondensate thanand base stacks. formation of unit. and so designed as to prevent misalignment. The design shall provide for silent burner E. IRI Compliance:master2. Analog shall Control be 4:20 allowed and devices 0-10vdc in theand alsoboilercontrol supported. network. sequences according to requirements of IRI (GE GAP). ignition and operation. The boiler shall be down fired counter flow such that formed condensate always moves C.B. VerifyJackets:2 that 24.Stainless installation Combustion-airPriority Steel firing is as(KN-6, –indicated temperatureAllows 10, 16, andmixing 20, specified.at 26, inletof 30). condensing to burner. and non-condensing, base load and/or other toward a cooler zone to prevent re-evaporation. An aluminum corrosion resistant condensate drain designed to J.F.D. Optional CSD-1 Install2 electricalKnock3.combination DistributedDivision Down devices (fieldof23 control (2) Sectionfurnished assembly): functional using “Feedwater with Heat-Net boilerif/when boiler, types Equipment” protocolbutscheduled notutilizing specified for forthe up(2) connections to boilerpriority to16 be total shall factorylevels. boilers. beto condensate shippedmounted. Knocked-Down and feedwater for system. field prevent3 poolingFlue-gas and accessible temperature condensate at boiler discharge. trap shall be provided. In some jurisdictions, a means of assemblyD.G. PROVIDEGas1. byBurner: Verify the THE installing The that FOLLOWING burner electrical contractor. shall wiringJOB beEach SPECIFIC metal installation boiler fiber shall TRIM mesh complies be AND supplied construction, FEATURES: with with manufacturer’s the allowing required high standard submittal turndown components; and of installationthe fuel-air Heat neutralizing3 the Divisioncondensate 23 Sections Ph levels for may control be required.wiring for Boiler automatic shall temperature be able to vent control. a horizontal distance of 80 3.3NetG.(120mixture. CONNECTIONS controlSCAQMD forrequirements TheKN-16/26/30) systemWhen4.25. burnerRuleSystem/Boiler Available operatingand 1146.2 flame in boiler equivalentDivision priority forshall asoperating trim/materialslow a burn “Master”, start/stop16NOx feet Sections.horizontally statusequipment with the toqualifiers in acompleteHeat-Net DoEnglishvent and not beshalldiameter textproceedcontrol theof bethe display.boiler done pre-mixprovidesequivalent with package. using boiler type a stand-aloneanyto withSubmitstartup the combination a forcedcombustion auntil supplemental method draftwiring of: fan.usingchamber A) installation Burnermodulation instruction a PID outlet shall is manualfire to acceptable4provide in addition Flue-gasequal to to equipment distribution the carbon standard Installer.dioxide, of heat Installation oxygen, throughout and Manual carbonthe entire for monoxide proper heat exchanger. assembly.concentration. BoilerThe burner installation shall be shall easily be diameter.1 algorithmpercentageHigh Gasto B)regulate Pressureoutdoor water air Switch temperature temperature. (or) The C) algorithm return water allows temperature. a single boiler “Master” or multiple accomplishedremoved for withinmaintenance acceptable without A.S.M.E. the disruption piping practices of any other and requirementsmajor component and inof strictthe boiler. accordance A window with view the H.A. ConnectARRA Compliance: 5.“Mastergas Interlock, piping + Member” full TotalEvent, size, overall and boilersto boiler System percentage in gas-traina networklogging of inlet USwithof upwithorigin a to time union.16 materials stamp.total boilers. used in the manufacturing of the boilers boilerport manufacturer’sshall5 be providedFlue recomgas for NOx mendationsvisual emissions inspection and where instructions. of applicable.the boiler A duringhydrostatic firing. pressure The gas test distribution of one-and-one-half components times and shall be 100% and 100% assembly of these products shall be completed in the US – Buy American compliant. the1.3burnerC. SUBMITTALSworking Complete shall2 pressure26. be manufacturer’s BaseenclosedValve of Loading Provingthe with boiler installation a–Switch cast-aluminum Providesshall be and conducted.the startup ability housing. checklist toSuch control tests and (1) shall verifybase be theload of suchfollowing: boiler duration with enable/disable as necessary and as4- directedB. Connect 6by the The6.20mAhot Advanced engineer Naturalwatercontrol modulating piping fluealgorithm PIDto draft. ensure toalgorithm signal supply is (ifthebased andrequired).optimized boiler return upon has forboilera beencontrol specific tappings assembled band, boilers with at (KN-Series). the shutoffand center installed valve of andwhich correctly union is the orwith flangesetpoint. no leaksat eachWhile or improperA.connection. Product13 operating Data:below BoilerIsolation Include theconditions. controlis level valverated onband, wiringcapacities; concrete boilers with base.mountedshipping, are staged boxinstalled, onin rearand and ofmodulated boiler operating up weights; until the furnished control bandspecialties; is entered. and 1.5C.B.accessories COORDINATION Safety-ReliefService 7.Once Access:for Four eachValve: in the dedicatedThemodel ASMEcontrol boilers indicated. rated, band, temperature shall factory modulation be provided set sensor to is protect usedwith inputs accesstoboiler maintain for: and covers Outside piping setpoint. for Airas easily per Optimized Temperature, schedule/drawings. accessing system Supplyall efficiencyserviceable 100 (Outlet psi is 4 alwaysPump accomplished starter by setting the Modulation Maximum “Mod-Max” setting to exploit each boiler E.C.I.components.maximum Measure InstallIgnition2 piping allowable components:Temperature,and The Fluerecordfrom boilers workingand safety-relief temperature chimneyThe Returnshall pressure ignition not Temperature valvesare risebe hardwareinstalled manufactured through to nearest (Inlet),without eachshall floor andboiler.consistwith visible drain. Header large damage.of Aluminaenclosures, Temperature. ceramic which insulated are difficult ignition to remove electrodes and reinstall. Allin accesses the network’s must inverseseal completely efficiency as curve. not to The disrupt control the shall sealed operate combustion so that process.the maximum All components number of B.A.and ShopCoordinate UV sensingDrawings:boilers size tube required, andDetail permanently location equipment operate of arrangedconcrete atassemblies their tobases.lowest ensure and inputsConcrete, indicate proper until ignition dimensions,reinforcement, all boilers electrode arerequired andfiring. and formwork UVclearances, Once alignment. all require boilers and ments method are firing, are of must be35 accessibleNo208/220-240V damage and able is to visible1PH adjust (KN16/20) to with boiler the jacket, removal refractory, of a single or combustioncover or cabinet chamber. component. 3.72.3C.D.fieldspecified DEMONSTRATIONBOILER ConnectGauge: assembly, in TRIMthe8. CombinationDivisionbreeching Automatically modulationcomponents, 3 Sectionto boilerwater clamp detects and “Cast-in-Place outlet,pressure locationis theremoved full optional sizeand Concrete.”and ofsizetemperature temperature outlet. all of boilerseach The field shippedboiler aresensors connection.allowed shall factoryon operate startto fire installed. up. above under thispositiveLCD clamped outlet (Category temperaturepercentage IV) or readoutnegative to (Category beup an to integral 100%. II) stack part This pressure. of “boiler the front efficiency”Vent boiler material control clamp must panel is be defaulted displaylisted AL29-4C to to allow 80% forStainless and consistent thus Double limits easy Wall all monitoring the Stack boilers for of 46 Pressure-reducing208/220-240V 3PH valves (KN16/20) are checked for correct operation and specified relief pressure. Adjust as 1.6FA.temperaturescondensing. WARRANTY RatedControls:Engage1. Capacity:Wiring 9.individual a appliances.The Menufactoryfactory-authorized Diagrams:boiler Thedriven mountedoutputs controlboiler calibration Detail to shall andpackage 80%service wired.bewiring untiland capable shallrepresentative setupthefor bepower,last of menus aoperating boiler MTI signal, withHeat-Net tofires. train ata and brightratedThe Owner’s orcontrol 80% capacity4-lineequivalent, defaultmaintenance systemsVacuum with integratedmust pressures Fluorescentand bepersonnel differentiate field boiler as lowDisplay.adjustable managementas as specifiedbetween 3" W.C. for required.varying operating conditions. All boilers modulate up and down together always at the same D.atsystem.below: theIndicating inlet manufacturer-installed The to controlthelights: burner systemEach gas boiler mustvalve. and shall befield-installed integral include to a each wiring.diagnostic boiler, controlcreating panel a control with networka full text that display eliminates indicating the need the 7 modulation460-600V rate. 3PH Boilers (KN-16/20/26/30) are shut down only when the top of the band is breached, or before the top conditionfor a “wall of mount” all interlocks stand-alone and the boiler BTUH system input percentage.control. Additional Access stand-alone to the controls control shall panels, be through independent a completely of a A.D.E. Electrical:GeneralBurner5 Controls: of10.Warranty: Complythe (8)Clearances band, Dedicated Boiler with The if the applicable shallspecial have control 24vac be been warrantyprovided requirements anticipatesinterlock provided specifiedwith monitors and thata inHoneywell pipingthereDivision in thisand is Article aflanged 168RM7800 light dedicatedSections. shallload. for series easy notTimers 120vac deprive removaldigital shall system flamethe alsoand Owner safe servicing.bemonitors included guardof other usedwith in rights each UVfor removableBuilding Management cover leaving System diagnostic (BMS), panel shall intact not be and allowed not disrupted. to operate the boiler network. G.C.therectification. SourceThe Owner 1burner Quality controldiagnosticsmay The shallOperate haveflame Controlin be the under capableandsafe boiler,network Tests providing guardother includingof and to 99% shallprovisions prevent Inspectionfeedback efficiency be accessories capable any of of Reports: boiler the withoutfaults of Contractand bothfrom and Indicate exceedingcontrols, pre shortsystem Documents and cycling.and to poststatus.a demonstrateinterpretNOx purge and reading testcycles.shall compliance resultsabove be in 11ppm.foraddition compli with requireto,ance and withments. run 2.4F.performanceconcurrent GroundMOTORS6 equipment. with, requirementsHeating other warrantiescircuit before pipes shipping. made have bybeen the connected Contractor to undercorrect requirements ports. of the Contract Documents. Installing contractor shall provide one year of warranty parts and labor. H.E. TheManufacturers: High 2burner Limit:11. andMultiple Train Temperature Hydrothermgas Owner’s trainboiler shall pump maintenance control (a be Mestek or provided withmotorized Company) manual-resetpersonnel with boiler the is onfollowing valve the procedures limits basis control trim boiler of and modes. design.and water features: schedules Listed temperature acceptable related into startup seriesmanu facturers withand the D.A.shalloperating ReferField be1.7shutdown,The Testsubjectto Tightencontrol. DivisionHeat-Net Reports:Labels to troubleshooting,electrical Highcompliance 15 control Indicateare SectionLimit clearly connectors shallshall withand"Motors" bevisible. beservicing, requirements.interpret capablefactory and for factory-installed terminalstestandmounted of operating resultspreventive Provide accordingand for inboilers sensecompliance motors.maintenance.the followingto bythe manufacturer's one outlet with of ways: the temperatureperformance following: published of requirements. the torque-tightening boiler through a B.dry Special well.values.1. Burner Warranty:12. IfCombustion manufacturer’sFiring: Submit Full Airmodulation a writtenDamper torque warranty, valueswithcontrol 5:1 are with executedturndown not proof indicated, time.by@ theContinuous usecontractor those CO2 specifiedfor the heat in ULexchanger. 486A and UL 486B. 3 Review data in the maintenance manuals. Refer to Division 1 Section “Contract Closeout.” E.B. Boiler Maintenance 1.8MEMBER: AsBlower Viessmann a stand-aloneBoiler, Data:Motor:Additional burner, Vertomat IncludeBlower boiler boilers and control inmotor flue in the theare shallsystem maintenance networkclean be using andexternally always free the manuals of Heat-Netdefault constructionmounted specifiedto protocol, the for role debris.ease in ofwith Divisionmember. of one service. “Master” 1.The There Include lack and ofshall multiple partssensors be list, no maintenancerequirementconnected“Member” to guide, remove units.to andthe covers J10wiring terminals diagramsor gas “SYS/DHWtrain for componentseach boiler.Header” to on remove each additional the blower boiler motor. shall The ensure KN-6 this. Blower shall F. PROVIDE41.2. BurnerWarranty13. THE OptionalReview Ignition: FOLLOWING Period: dataUSB/RS485 Intermittent inManufacturer’s the STANDARD maintenance networkspark standard, plug-inTRIM: manuals. to butallow Refer not firmware lessto Division than updates 10 1 Section years or custom from“Operation configurations. date ofand Substantial Maintenance be .5 HP9 and FLAPressure not to and exceed temperature 5 Amps. gages The KN-10 are installed. Blower shall be .5 HP and FLA not to exceed 8 Amps. 3.4 FIELDData.”Completion2. QUALITYCleaver onCONTROLBrooks the heat – Clear exchanger. Fire Additional 21-year thermal shock warranty on heat exchanger. The KN-16 Blower shall be 1HP and FLA not to exceed 11 Amps. The KN-20 Blower shall be 1 HP and FLA 1.2. StainlessAs14. a boilerOptional Steel network, BACnet, Condensate enabled LONWORKS Receiver by a Building andPan N2 Management interface. System (BMS), using the Heat-Net protocol, not to exceed103. Safety 11Control Controls: Amps. installations The Energize KN-26 ignition,areBlower completed. shalllimit timebe 3 forHP establishing and FLA not flame, to exceed prevent 14 openingAmps. The of gas KN-30 valve Blower until 3.with Pattersonone “Master” Kelley and - multipleMach “Member” units. shallA. Manufacturer’s be5pilot 3 HP Eachflame andSchedule “Member” is FLAField proven, not Service:training toshall stop exceed sense gaswith Engage 14flow Owner its Amps. onsupply a ignitionwithfactory-authorized outlet at leastfailure, water 7 days’and temperature allowservice advance gas representative andvalvenotice. modulate to open. tobased supervise on signals the field assembly 2. Low of 15.from components AirAlarm a Pressure Building contacts. and ManagementSwitch installation System of boilers, (BMS) including or “Master” piping boiler. and electrical When operating connections. as a member, Report results 2.5in SOURCEwriting.4.3. As Flue-Gasstarting, QUALITY“Member” stopping,Collector: CONTROLboilers and toEnclosed a firing Building rate combustion Management shall also chamber be Systemcontrolled with (BMS) byintegral the with “BMS” combustion-air multiple or “Master” input control blower boiler. methods. and single D. Ensure 3.venting Blocked pumps16. Runtimeconnection. operateFlue Detectionhours. properly. Switch A. Test1. Testand andinspect adjust boilers controls according and safeties. to the ReplaceASME Boiler damaged and andPressure malfunctioning Vessel Code, controls Section and equip IV. Boilersment. ENDE.shall Check OF 4.Boiler5.beSECTION ModulationFailsafe operationGastest17. shall firedOutdoorTrain: mode 23 be inof Control 52 theManualcommissionedgas Air–16 factory When pressure Reset ball awith with Building typeregulator bya programmable report factory-authorizedgas Automation devicevalvesattached on (2),ratio. Systempermanentlygas main technician. train, isgas controllingincluding tovalve, theContact exteriorventing.manual set local point, cabinet leak representative if communications test of the valve, boiler for pilot forfactory are fieldgas reference.authorizedpressurelost, the boiler/system regulator, technician and information.will automatic run off the pilot Local gas set valve. point. All components to be factory mounted and CSD-1 F. Check5.compliant. Temperature/Pressurethat18. fluid-level, Time of Day flow-switch clock Gauge to provide(optional), (loose) up andto four high-temperature (4) night setback interlocks temperatures. are in place.