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Operating Instructions and Owner’s Manual
Mr. Heater, Inc.| Forced Air Propane Construction Heater
NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
OPERATING PRECAUTIONS
Thisisapropane,direct-fired,forcedairheater.It'sintendeduse
isprimarilytemporaryheatingofbuildingsunderconstruction,
alterationorrepair.
Propaneisheavierthanair.Ifpropaneleaksfromaconnectionor
fitting,itsinkstothefloor,collectingtherewiththesurrounding
air,formingapotentiallyexplosivemixture.Obviously,propane
leaksshouldbeavoided,sosetupthepropanesupplywith
utmostcare.ReadenclosedOdorFadeandPropaneSheetfor
additionalinformationaboutdetectingpropaneleaks.Leakcheck
newconnectionsorreconnectionswithasoapandwatersolution
andfollowallconnectioninstructionsherein.Also,askyour
propanedealerforadviceonthepropaneapplicationandsupply
installationandaskhimtocheckitifthereareanyquestions.
Thisheaterwasdesignedandcertifiedforuseasaconstruction
heaterinaccordancewithANSIZ83.7/CGA2.14.Checkwith
yourlocalfiresafetyauthorityifyouhaveanyquestionsabout
yourapplications.Otherstandardsgoverntheuseoffuelgases
andheatproducingproductsinspecificapplications.Yourlocal
authoritycanadviseyouaboutthese.
Direct-Firedmeansthatallofthecombustionproductsenterthe
heatedspace.Eventhoughthisheateroperatesverycloseto100
percentcombustionefficiency,itstillproducessmallamountsof
carbonmonoxide.Carbonmonoxide(calledCO)istoxic.Wecan
toleratesmallamountsbutnotalot.COcanbuildupinaheated
spaceandfailuretoprovideadequateventilationcouldresultin
death.Thesymptomsofinadequateventilationare:
• headache
• dizziness
• burningeyesandnose
• nausea
• drymouthorsorethroat
So,besuretofollowadviceaboutventilationintheseoperating
instructions.
ForcedAirmeansthatablowerorfanpushestheairthroughthe
heater.Propercombustiondependsuponthisairflow;therefore,
theheatermustnotberevised,modifiedoroperatedwith
partsremovedormissing.Likewise,safetysystemsmustnotbe
circumventedormodifiedinordertooperatetheheater.
Whentheheateristobeoperatedinthepresenceofotherpeople
theuserisresponsibleforproperlyacquaintingthosepresent
withthesafetyprecautionsandinstructions,andofthehazards
involved.
SPECIFICATIONS
Model:
MH125FAV
Rating:
75,000-125,000Btu/Hr
(8.8-17.6kW)
FuelConsumption:
3.5-5.8#/hr
(1.59-2.63kg/hr)
FuelOrificePortNo.:
18
FuelOrificePortSize:
0.0295"
(0.75mm)
HeatedAirOutput:
350cfm
(9.91cmm)
AverageAirTemp.Rise:
400°F(232°C)