60K-BTU-20FT-TUBE-HTR-180 User Manual

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Operating Instructions and Owner’s ManualMr. Heater Series Heater

9. Aqualifiedserviceagencyshouldbecontactedforservice

otherthanroutinemaintenance.

10. Checkventterminalandfreshairinlettoseethattheyhave

notbeenblockedduringthenon-heatingseason.Ifeither

pipeisrestricted,theairswitchwon’tclose,resultingina

no-heatsituation.

Troubleshooting

  CAUTION:BeforeopeningtheMR.Heater

burnerdoorforanytypeofservice,besure

thegassupplyhasbeenshutoffattheheater

andtheelectricalcordfromtheburnerbox

hasbeenunplugged.

 Blower Motor 1.Isthethermostatcallingforheat?Isthere

 Fails to Run: 115Vattheburnerreceptacle?

  2.Checkblowersidedoorforseal.Checkdoor

switch.Replaceifnecessary/

  3.Checkblowerforobstructions.Replace

blowerifnecessary.

 Igniter 1.Checkigniterfordamage.Replaceif

 Does Not Glow: necessary.

  2.Checkvoltageandresistanceatigniter.

(Voltageshouldbe115V.Resistanceshould

be40-75ohms.)

  3.Checkforobstructionstotheairinletand

outlet.

  4.Checkwiringandhoseconnectionstothe

airswitch.Replaceifnecessary.

  5.Checkvoltagesattransformerprimaryand

secondary.Replacetransformerormoduleif

necessary.

 Valve Does Not Gaspressuredownstreamofgascontrolcan

 Come On: bemeasurebyusingamanometerand

connectingtopressuretaponcontrol/

  1.ChecktoseeifmanualvalveheaterisON.

  2.Checktoseeifmanualvalveknobonheater

gascontrolinON.

  3.Supplygaspressurecanbecheckedat1/8”

NPTpressuretappingonheaterexternal

manualvalve.

  4.Checktoseeifgascontrolisopening:no

manifoldpressureindicatesvalveisclosed.

  Ifthevalveisclosed,eitherthegasvalveor

theignitionmoduleisfaulty.

WARNING:Donotdisconnectgroundleads

insideheater.Donotinterchangegrounded

andungroundedleadsontransformeror

ignitionmodule.

 Burner Does Not 1.Checktoseeifgaslineswereproperly

 Light: purgedofair.

  2.Checkinletandoutletgaspressureduring

ignitionperiod.

  Naturalinletpressureshouldbe4.6”

  Naturaloutletpressureshouldbe3.5”

  LPinletpressureshouldbe11.0”

  LPoutletpressureshouldbe10.25”

  3.Checkforproperorificeandairplate.

SECTION 8

Operation & Maintenance

Sequence of Operation

1. Turnthethermostatup.Whenthethermostatcallsforheat,

blowermotorwillenergize.

2. WhenthemotorapproachesnominalrunningRPM,theair

provingswitchclosesandactivatestheignitionmodule.

3. Theignitionmodulethenenergizesthehotsurfaceigniterfor

atimedwarm-upperiod(approximately45to60seconds.)

4. Afterthewarm-upperiod,thegasvalveisenergized.

5. Duringthelastpartofthesequence,theigniterisde-

energizedandisconvertedtoaflamesensingrod.

6. Ifaflameisdetected,thegasvalveremainsopen.Whenthe

callforheatissatisfied,andthesystemcontrolmechanism

de-energizestheburnerlinevoltagesupply,thegasvalvesare

turnedoff.

7. Ifnoflameisdetectedonasingle-trymodule,thegasvalve

isclosed,andthemodulewilllockoutuntilitisreset.Reset

isaccomplishedbyremovingpowerfromthemoduleforat

leastfive(5)seconds(thermostatcyclerequired.)

8. Ifnoflameisdetectedonathree-trialmodule,thegas

valveisclosed,andapurgeperiodbegins.Afterthepurge,

themoduleactstopowertheigniterforasecondwarm-

upperiod,andasecondtrialforignitionperiod.Ifflameis

stillnotestablished,athirdandfinalpurge,warm-up,and

trialcyclebegins.Afterthreetrials,themodulewilllockout

untilreset.Resetisaccomplishedbyremovingpowerfrom

themoduleforatleastfive(5)seconds(thermostatcycle

required.)

9. Onathree-trialmodule,ifflameisestablishedandlost

onthefirstorsecondtrial,thegasvalveisturnedoff,a

purge,warm-up,andtrialforignitionwilloccuronathree-

trialmodule,onlythreetrialsforignitionareallowedper

thermostatcycle.

Maintenance

Forbestperformance,thefollowingmaintenanceproceduresshould

beperformedbeforeeachheatingseason:

1. Besuregasandelectricalsupplytoheaterareoffbefore

performinganyserviceormaintenance.

2. Checkconditionofblowerscrollandmotor.Dirtanddust

maybeblownoutwithcompressedair,oravacuumcleaner

maybeused.Whenusingcompressedairdonotexceed30

psiinordertonotdamagefragilehotsurfaceigniter.

3. Checkconditionofburner.Carefullyremoveanydustor

debrisfrominsidetheburnerboxorburnercup.

4. Inspecttheigniter.Replaceigniterifthereisexcessivecarbon

residue,erosion,breakageorotherdefects.

5. Checktheinsideofthefiringtubewithaflashlight.Ifcarbon

orscalearepresent,scrapeoutthedepositswithawire

brushorrod,ormetalplateattachedtoawoodenpole.

6. Checktoseethattheburnerobservationwindowisclean

andfreeofcracksorholes.Cleanorreplaceasnecessary.

7. Checkthefluepipeforsootordirt.Aftercleaningas

necessary,re-attachthefluepipetotheheater.

8. Outsidesurfacesofheatermaybecleanedbywipingwitha

dampcloth.

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User Manual - Page 19