MH400FAVT User Manual

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Force-Air Propane Construction Heater Operating Instructions and Owner’s Manual

OPERATING INSTRUCTIONS

PREPARING FOR OPERATION

1. Checktheheaterforpossibleshippingdamage.Ifanyis

found,immediatelynotifythefactory.

2. Followallofthe“Precautions”.

3. ConnectthePOLfittingofhoseandregulatorassembly

tothepropanecylinderbyrotatingthePOLnut

counterclockwiseintothepropanecylinder’svalveoutletand

securelytightenwithawrench.

4. Connectthehosetotheheaterbyrotatingthehosefitting

clockwise.

5. Securelytightenallgasconnections.

6. Openthecylinder’sgasvalveandcheckallgasconnections

withasoapandwatersolution.DONOTUSEAFLAME.

7. Connectpowercordtowell-grounded115V,60Hz,1Øsource

ofpower.

8. Whenusinganextensioncord,makecertainthatitisa

3-wire(grounded)cordofproperwiresize.

START

1. Slowlyopenthemainvalveatpropanecylindertoprevent

excessflowcheckvalvefromclosing.

2. Setthermostattofullon.Heaterwilligniteautomatically.

3. Adjustballvalveoncontrolpaneltodesiredburnrate.

4. Setthermostattodesiredtemperature.Heaterwillturnoff

andonautomaticallyasthetemperaturevariesintheheater

area.

STOP

1. Securelyclosevalveonthepropanecylinder.

2. Continuetooperateheateruntilallfuelinthehosehas

burned.

3. Turntheheaterthermostatto“off”.Forextendedshutdown

orinareaswherethetemperatureisbelow0°F,unplugthe

heater.

RESTART AFTER SAFETY SHUTDOWN

1. Securelyclosevalveatpropanecylinder.Unplugheater.

2. Wait5minutes.

3. Restartfollowing“Start”procedure.

MAINTENANCE AND STORAGE

1. Theheatershouldbeinspectedbeforeeachuse,andatleast

annuallybyaqualifiedperson.

2. Beforeeachuse,checkthesoft“O”ringseatatthebullnose

ofthePOLfitting.Ifthe“O”ringiscut,scuffed,orotherwise

damaged,replaceitwithpartnumber6681.[Isthistheright

#?]

3. TurnoffthegasattheLP-gassupplycylinder(s)whenthe

heaterisnotinuse.

4. Whentheheateristobestoredindoors,theconnection

betweentheLP-gassupplycylinder(s)andtheheatermust

bedisconnectedandthecylinder(s)removedfromtheheater

andstoredoutofdoorsandinaccordancewithChapter5of

thestandardforStorageandHandlingofLiquefiedPetroleum

GasesANSI/NFPA58andCSAB149.1,NaturalGasand

PropaneInstallationCode.

SERVICING

Ahazardousconditionmayresultifaheaterisusedthathasbeen

modifiedorisnotfunctioningproperly.

Whentheheaterisworkingproperly:

• Theflameiscontainedwithintheheater.

• Theflameisessentiallybluewithperhapssomeyellow

 tipping.

•



Thereisnostrongdisagreeableodor,eyeburning,

or otherphysicaldiscomfort.

• Thereisnosmokeorsootinternalorexternaltothe

 heater.

• Therearenounplannedorunexplainedshutdownsof

 theheater.

Thepartslistsandwiringdiagramshowtheheaterasitwas

constructed.Donotuseaheaterwhichisdifferentfromthat

shown.Inthisregard,useonlythehose,regulatorandcylinder

connectionfitting(calledaPOLfitting)suppliedwiththeheater.

IMPORTANTMatchthecolorstripeonthehangtagattachedto

thehoseassemblywiththecoloronthelabellocatednearthe

propaneinletfittingontheheater.Donotusealternates.Forthis

heater,theregulatormustbesetasshownin“specifications”.

Ifthereisanyuncertaintyabouttheregulatorsetting,haveit

checked.

Aheaterwhichisnotworkingrightmustberepaired,butonlyby

atrained,experiencedserviceperson.

In-warrantyproductswillberepairedwithnochargeforeither

partsorlabor.Pleaseincludeabriefstatementindicatingdate,

placeofpurchase,thenatureoftheproblemandproofof

purchase.

Out-of-warrantyproductswillberepairedwithachargeforparts

andlabor.

SIZE AND CAPACITY

OF PROPANE CYLINDERS

Thechartsbelowshowtheapproximatesizeofthecylinder

requiredfortheseheaters.Tousethechart:

1. Selectthelowestairtemperatureexpected(atthe

bottomofthechart).

2. Movestraightuptotimeofoperationdesired(leftside

ofthechart).

3. Readthecylindersizerequired.

Allheatersshouldhave:

Fullcylinderswithgoodaircirculationandnofrostoncylinders

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User Manual - Page 5