Nordyne CMF95 Series Installation Instructions

23
START-UP&ADJUSTMENTS
Pre-StartCheckList
√ Verifythepolarityoftheconnectionsarecorrect,the
linevoltagepowerleadsaresecurelyconnectedand
thefurnaceisproperlygrounded.
√ Verifythethermostatwires(R,W,Y,&G)aresecurely
connectedtothecorrectleadsontheterminalstripof
thecircuitboard.
√ Verifythegaslineservicepressuredoesnotexceed
10.0inchesofW.C.,andisnotlessthan4.5inchesW.C.
fornaturalgas.ForLPgasthelineservicepressure
mustnotexceed14in.W.C.,andmustnotbelessthan
11.0in.W.C.
√ Verify the roll-out and vent switches are closed. If
necessary,presstheredbuttontoresetaswitch.DO
NOTinstallajumperwireacrossaswitchtodefeat
itsfunction.Ifaswitchreopensonstartup,DONOT
resettheswitchwithoutidentifyingandcorrectingthe
faultcondition.
√ Verify the blower door is in place, closing the door
switchinthelinevoltagecircuit.
√ Verifythegaslinehasbeenpurgedandallconnections
areleakfree.
Start-upProcedures
Donotperformthesestepsuntilallofthechecksinthe
previousstepshavebeencompleted:
1.Setthethermostattothelowestsetting.
2.Turnoffallelectricalpowertothefurnace.
3.FollowtheOperatingInstructionsonthelabelattached
tothefurnace.
4.Setthethermostataboveroomtemperatureandverify
theOperatingSequence(page25).
5.After5minutesofoperation,setthethermostatbelow
roomtemperatureandverifysteps9-10oftheOperating
Sequence.
Verifying&AdjustingInputRate
The input rate must be veriedforeach installation to
preventover-ringofthefurnace.NOTE:Theinputrate
mustnotexceedtherateshownonthefurnaceratingplate.
Ataltitudesabove2,000feet,itmustnotexceedthaton
theratingplateless4%foreach1,000feet.Todetermine
theexactinputrate,performthefollowingprocedures:
1.Shutoffallothergasredappliances.
2.Startthefurnaceandrunitforatleast3minutes.
3.Measure the time (in seconds) required for the gas
metertocompleteonerevolution.
4.Convertthetimeperrevolutiontocubicfeetofgasper
hourusingTable7(page30).
5.Multiplythegasowrateincubicftperhrbytheheating
valueofthegasinBtupercubicfttoobtaintheinput
rateinBtuh.Seeexample.
6.Themanifoldpressuremustbesettotheappropriate
valueforeachinstallationbyaqualiedinstaller,service
agencyorthegassupplier.
WARNING:
Donotattempttodrillthegasorices.Useonly
factory supplied orices. Improperly drilled
orices may cause re, explosion, carbon
monoxidepoisoning,personalinjuryordeath.
a.)Obtain themanifoldpressuresettingrequiredfor
thisinstallationbyreferringtoTable11forPropane
orTable12(page31)forNaturalGas.
b.)Remove the regulator capscrew from the INLET
sideoftheregulator.SeeFigure30,page30-gas
valvepictureinLPsection.
c.) Slowlyturntheadjustmentscrewinsidetheregulator
to obtain the appropriate manifold pressure.
NOTE:Turningthescrewclockwiseincreasesthe
pressureandturningthescrewcounter-clockwise
decreases the pressure. To prevent backing the
screwallthewayoutfromthevalve,turnthescrew
slowly.
d.)Replaceandtightentheregulatorcapscrewover
theadjustmentscrew.
Verifying&AdjustingTemperatureRise
Afterinstallationofthefurnace,conrmthetemperature
riseofthefurnaceiswithinthelimitsspeciedontherating
plate.Anytemperaturerise outside thespeciedlimits
couldresultinprematurefailureoftheheatexchanger.
For typical duct systems, the temperature rise will fall
within the limits specied on the rating plate with the
blowerspeedatthefactoryrecommendedsetting.Ifthe
measuredtemperatureriseisoutsidethespeciedlimits,
itmaybenecessarytochangethespeedoftheblower.
NOTE: Lowering the blower speed will increase the
temperatureriseandahigherblowerspeedwilldecrease
thetemperaturerise.
Thefurnaceisequippedwithamulti-speedmotor.Heating
andcoolingspeedselectionismadebymovingtheswitch
ontheintegratedcontrollocatedinthefurnace.
1.Placethermometersinthereturnandsupplyairstream
asclosetothefurnaceaspossible.IMPORTANT:The
thermometeronthesupplyairsidemustbeshielded
fromdirectradiationfromtheheatexchangerto
avoidfalsereadings.
2.Consult Table 5 (page 24) and the rating plate for
the proper circulating air ow and temperature rise.
Example:
• Timefor1revolutionofagasmeterwitha1cubic
ftdial=40seconds.
• FromTable7read90cubicftgasperhr.
• Localheatingvalueofthegas(obtainedfromgas
supplier)=1,040Btupercubicft.
• Inputrate=1,040x90=93,600Btuh.

Nordyne CMF95 Series Specifications

General

Brand	Nordyne
Model	CMF95 Series
Category	Furnace
Language	English