PrecisionTemp TWINTEMP JR. Istruzioni per l'uso e l'installazione

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TWINTEMPJR.HYDRONIC

SYSTEM

2/2013

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TwinTempDescriptionofOperationandSequenceofOperation

TechnicalDescriptionofOperation‐TheTwinTempsystemsprovidequietspaceheatingutilizingliquidtoair

blowersorradiantdevices,whileproducingacontinuoussupplyofhotwater.ItsVariflamegasmodulationenablesitto

useaverysmalltankandstillmaintainefficiencywithoutrapidburnercycling.Thisgreatlyreducesstartuptimeand

standbyheatloss.UnlikeitsdieselcounterpartstheTwinTemphasaninstantonburnerandmodulatesthegasflowona

4‐1ratio.Acopperheatexchangerinsidethetankofheatedantifreezeinusedtoindirectlyheatthepotablewater.This

methodisnotonlyefficient,butwillextendthelifeofthecriticalheatexchangeelements,tankandcirculatingpumps.

SequenceofOperation

ThepowerandpropaneareturnedontotheTwinTemp.IftheTankthermostatsenseslowtanktemperature

(below190°F),itwillsend12vdcpowertothegreencontrolboardandPump1(rear)pump.Note‐theJuniorhas

onezonepumpandtheTwinTemp‐2has2zonepumps.

Anti‐freezestartstocirculatefromthebottomofthetank,throughPump1,totheburnerheatexchanger,outto

Zone1blowersandbacktotank.

Simultaneously,thecontrolboardpowersthepowerventrelaywhichactivatesthepowerventandfluingis

proofedbythepressureswitchviathe¼”hose.Thepressureswitchsends12VDCtotheignitionboard(ifflueis

blocked,burnerwillnotlight).

Thesolenoidgasvalveisenergizedandasparkiseffectedtotheigniterprobeoverburnerviatheyellowignition

wire.Theflameisproofedviathesameigniterelementandyellowwire.

Gasflowisadjustedbythegasmodulatingvalvebasedonantifreezetemperature.Temperaturereadingsare

takentwicepersecondbytheT‐MidThermistor.Assettemperature(about190°F)isapproached,thegasflowis

reducedasmuchas70%byreducingthevoltagetothegasmodulatingvalveuntilsettemperatureisachievedand

theburnergoesoff.

Whenahotwatertapisopened,coldwaterentersthecoppertankheatexchangerimbeddedinthetankandthe

heattransfertakesplace.Thehotwaterexitsthetankcoilthroughatemperingvalvethatcanbesettoany

temperaturebetween100°‐145°.Asthetankcools,theburnercyclestartsagainwhenthetankthermostatsenses

thetankisgettingcold.

Ifthezone1roomthermostatsenseslowroomtemperature,itsendspowertothezone’srelaythatthenpowers

pump1,controlboardandthezoneblowersthroughthe160degreetankswitch.

Whenthezone2(TwinTemp‐2only)thermostatcallsforheatthezone2relaysendspowertothepump2andthe

blowersinzone2areactivated.Theburnerwillbeactivatedbythetankthermostatasaboveiftheantifreeze

temperaturefallsbelowsettemperature.

TheblowerthermostatswitchwillturnofftheZone1blowersiftanktemperaturedropsbelow160°F.orwill

keepblowersoffuntiltanktemperaturereaches160‐170degreesoncoldstart.

NOTE:Theboldorangetermsareidentifiedandpicturedinthefollowingpages.

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TwinTemp Preventive Maintenance Schedule

It is recommended that the TwinTemp be inspected by a qualified service

technician at least once a year.

1.Clean interior of TwinTemp cabinet including

combustion air intake grill. ***

2.Inspect all wiring connectors for corrosion and

looseness. Tighten and or repair if needed. ***

3.Performance test heating and hot water functions.

***

4.Check interior and exterior plumbing connections

for fluid leak. **

5.Check propane connections for leaks. **

6.Check boiler antifreeze level in overflow tank.****

7.Drain and refill boiler antifreeze. ***

(Use only Rhogard boiler antifreeze or equivalent with

Aluminum tank)

8. Rotate Mixing valve knob clockwise and counter

clockwise. **

9.All faucet aerators and showerhead screens in the

coach should be cleaned regularly.***

** Bi-Annually

*** Perform every 12 months

**** Bi-Monthly

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TwinTemp2/Jr.Diagnostics&TroubleShooting

A. UseRhogardBoilerantifreezewithProtek922additiveor

equivalentwithAluminumtank.Camcoisacceptablewith

stainlesssteeltank.

1. Mixantifreeze50/50withdistilledwater

2. Totalamountofantifreezeheldinhydronicsystemofa

Newmarcoachisapproximately5.5gal.

3. Alwayscheckfluidlevelandcondition.

4. Commoncauseofcontamination;

a. Repeatedintroductionofairinclosedsystemcausing

fluidcontamination.

b. Plumbingleaks,radiatorcap,etc.

c. Donotmixwinterizingafrz.orethyleneglycolafrz.

withpropyleneglycolboilerantifreeze.

d. Effectsofcontamination,sludge,metalcorrosion.

B. Startingdiagnosticscheckbasics;power,faultcodes,etc.

thenusethesequenceofoperationtoaiddiagnostics.

1. Twocallsforignition,Antifreezetemperature(tank

thermostatswitch)andinteriorthermostat.

C. Causesandsymptomsofrestrictedflow.

1. Sludge/restrictioninplumbingloop.

2. Kinkedplumbinglinesorconnections.

3. Soundsassociatedwithrestrictedflowarerattling

knockingnoiseduringpropaneignitionwithignitiononly

lasting10‐20seconds.

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4. Monitortmidtestpoint(yellow)duringignitionfora

rapidDCvoltagedropi.e.2.0vDCdropto.5vDCin10‐30

secondsindicatingrestrictedflow.

D. Plumbingrestrictions:Supplylinehotreturnlinewarm/cool

whileinwintermode.

1. Summer/Wintervalvemayallowfluidtobleedthroughif

restrictionisinthehydronicloopcausingtheTTto

appeartooperatenormally.

E. Newmarusesrelaysmakingasinglezonesystemintotwo

zonesystembycontrollingtheheatregisterfans.

1. TheTwinTempthermostatandblowersignalgoestothe

bankofrelaysandthendistributedtothecoachwiring.

F. Summer/wintervalvepositions.

G. Electricelementoperation.

1. Usedasstandaloneforlimitedhotwaterorusedin

conjunctionwithpropanetoreducepropane

consumptionineithersummerorwinteroperation.

2. Overheatreset&electricelementECO

3. Lowfluidlevelintankwillmakeboilingnoisewhen

electricelementisinuse.

H. Hotwaterproduction

1. Mixingvalve.

2. Summerhotwaterproduction,2.25gallonsofantifreeze

heated.

3. Winterhotwaterproductiondelayeduntil5.5gallonsof

antifreezeareheatedcausingshortdelayinhotwater

production.

1. Currentvendorpartissues.NONE

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TwinTempHydronicHeating/WaterHeatingOperatingInstructions

Formaximumheatandhotwateroutput,itisrecommendedtousetheLPGmodeofoperationinadditiontothe

120voltelectricelement.Electricelementoperationshouldbeusedforminimalhotwaterdemandsuchas

washinghandsordishes.Itisnotnecessarytohavethewatersystemfilledtousethespaceheatingsystem,but

theheatingsystemmustbefilledwithanti‐freeze.

ToStartUpSystem:

Turnonthepropanesupply.

Turnon12voltpowerswitchontherightsideoftheTwinTempcabinet.

Turnon12voltpowerswitchoncoach,ifapplicable.

Burnerwillstart‐upandsystemwillbeuptooperatingtemperatureinapproximately10‐15minutes

dependingonpositionofSummer/wintervalve.

SummerOperation

PositionSummer/WintervalveinSummerposition.

WhenthespaceheatingfunctionoftheTwinTempisnotneeded,theheatedanti‐freezeshouldnotbecirculated

totheblowers.Topreventthiscirculation,theSummer/Winterby‐passvalveshouldbeturned¼turn.When

heatingisagainneeded,thisvalvehandleshouldbeturned¼quarterturnfromtheSummerpositiontothe

Winterposition.Thisadjustmentshouldonlybeneededtwiceayearforsummer/winteroperation.

  

SummerWinter

ForSpaceHeating:

PositionSummer/WintervalveinWinterposition.Turnonmaincoachthermostatandsettodesired

temperature.Whenthesystemreachessettemperaturetheblowerswillturnonandheatisdelivered.When

roomreachessettemperature,thepumpandblowersforthatzonewillgooff.Iftanktemperatureisbelowset

temperaturetheburnerwillstayonuntiltankreachessettemperature.NOTE:theheatregisterblowerswillnot

activateifthetanktemperatureisbelow160˚F.Thisassuresthatthehotwaterfunctiontakespriorityunder

heavyusageconditions.Blowerswillresumeoperationwhentankreturnstooperatingtemperature.

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ForHotWater

TwinTempunitandwatersystempumpmustbeturnedonorconnecttocitywatersystem.Turnonhotwater

tap.Note:Duringheavyheatandhotwaterdemand,thehotwatersystemtakespriorityandtheheatregister

blowersmayshutoffbrieflytomaintainhotwatersupply.Hotwatertemperatureisfactorysetatapproximately

120degrees.Tochangetemperature,consulttheoperatingmanual.

Oncethetankreachessettemperature(5‐15minutesaftersystemisturnedon),continuoushotwateris

deliveredwhenanytapisopened.Deliverytemperatureisdeterminedbythesettingoftemperingvalve

Warning:thisvalveisfactorysetatabout120˚F.adjustingtemperatureanyhighercouldresultinsevereinjury

duetoscalding.

Tankthermostatturnspump1andburneronautomaticallywhentanktemperaturestartstodrop.Anti‐freeze

circulatesfromburnerandbacktotankasitheats.Burnerremainsinhighfireandgasmodulatesburnertolow

burnuntilsettemperatureisattained.Whensettemperatureisreached,burnerandpumpshutdownand

systemreturnstostand‐bymode.

WinterModeHotWaterProduction

Duringwinteroperationifthesystemhasbeendormantformorethan20minutesturnoninteriorthermostatto

callforheat.Whentheheatregisterblowerscomeonturnoffthermostatandturnonhotwatertap.Preheating

thesystemisrequiredinwintermodeforhotwaterproductiondueto3gallonsofcoldfluidinthehydronicloop

suddenlybeingreturnedtotheTwinTemptankloweringthefluid(boilerantifreeze)temperaturerequiredforhot

waterproduction.Oncefluidtemperaturereachessettemperaturethesystemwillmakecontinuoushotwater.

ToUseWith110VoltHeatingElement

Turnon110voltelementswitchlocatedinsidecoach.Lettheunitheatupforaminimumof30‐60minutes.

Note:Inthe110voltmodeofoperationtheelectricelementsuppliestheheatuntildemandexceedsitscapacity

atwhichtimegasburnerautomaticallyignites.

TheTwinTempJr.isequippedwithone110VACelectricheatingelement.Theelementprovideslimitedamounts

ofhotwaterorspaceheating,suchaswashinghandsordishes.Theelectricelementcanbeusedwithorwithout

thepropaneburner,butforcontinuoushotwaterorspaceheat,thepropaneburnermustbeused.Tooperate,

turnthe110voltswitchoninthecoach.Forsmallamountsofhotwateronly,thereisnoneedtoturnthe12volt

powerontotheTwinTemp.However,ifspaceheatisrequiredinverycoldweather,the12voltswitchshouldbe

turnedon.Ifthereisahigherdemandforheatthanthe110voltelement(s)canprovide,thepropaneburnerwill

activateautomatically.Forbestoperation,turnthe110voltelementonabout30minutesbeforeturning12volt

switchon.Thisallowsthetanktocomeuptotemperatureutilizingtheelectricelementbeforetheburnercan

activate.Thiswillhelpconservepropane.

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