Honeywell TRUEDRY DH150 - Refrigerant Charging; Impeller Fan Replacement

Installation Guide
69-2271EFS—01 14
Refrigerant Charging
Iftherefrigerantchargeislostduetoserviceoraleak,anewchargemustbeaccuratelyweighedin.Ifanyofthe
oldchargeisleftinthesystem,itmustberecoveredbeforeweighinginthenewcharge.Refertotheunitnameplate
for the correct charge weight and refrigerant type.
Impeller Fan Replacement
Themotorizedimpellerfanisaunitaryassemblyconsistingofthemotorandimpellerfan.Ifdefective,thecomplete
assemblymustbereplaced.
1. Unplugthepowercord.
2. Removethecabinetaccesspanel.
3. Removethescrewattachingtheimpellerfansupportbrackettothebase.
4. Disconnecttheimpellerfanleadsinsidetheelectricbox.
5. Removefan/bracketassemblybyremoving3screwsfromthebracketandinletringassembly.
6. Removethedefectiveimpellerfanfromthebracketandreplacewithitwiththenewimpellerfan.
7. Reassemblethenewimpellerfanbyreversingtheaboveprocedure.Note:Therearetwopinsonthebacksideof
thecabinetthatmustalignwiththetwoholesintheimpellerfansupportbracket.
Compressor/Capacitor Replacement
Thiscompressorisequippedwithatwoterminalexternaloverloadandaruncapacitor,butnostartcapacitoror
relay
Checking Compressor Motor Circuits
Performthefollowingtestsiftheimpellerfanrunsbutthecompressordoesnotwiththefanswitchandventilation
timerOFFandthehumiditycontrolON.
1. Unplugtheunit;removethecabinetsideandtheelectricalconnectioncoveronthecompressortop.
2. PlugintheunitandturnthehumiditycontroltoON.Checkfor110voltsfromcompressorterminalRto
overloadterminal3usinganACvoltmeter.Ifvoltageispresent,gotostep3.Ifnovoltage,theremaybealoose
connectioninthecompressorcircuit.Testeachcomponentforcontinuity.Seetheappropriatesectionifadefect
is suspected.
3. Unplugtheunit,andthendisconnecttheredandyellowwiresfromcompressorterminalsR&S.Usingan
ohmmetercheckcontinuitybetweenthepointslistedbelow.
4. CompressorterminalsCandS:Nocontinuityindicatesanopenstartwinding.Thecompressormustbe
replaced.Normalstartwindingresistanceis3to7ohms.
5. CompressorterminalsCandR:Nocontinuityindicatesanopenrunwinding.Thecompressormustbereplaced.
Normalrunwindingresistanceis.5to2ohms.
6. CompressorterminalCandoverloadterminal1:Nocontinuityindicatesadefectiveoverloadlead.
7. Overloadterminals1and3:Ifthereisnocontinuity,theoverloadmaybetripped.Wait10minutesandtryagain.
Ifthereisstillnocontinuity,itisdefectiveandmustbereplaced.
8. CompressorterminalCandcompressorcase:Continuityindicatesagroundedmotor.Thecompressormustbe
replaced.
9. Disconnectthewiresfromtheruncapacitor.SettheohmmetertotheRx1scale.Thecapacitorisshortedand
mustbereplacedifcontinuityexistsacrossitsterminals.Ifthereisnoneedlemovementwiththemeterseton
theRx100000scale,thecapacitorisopenandmustbereplaced.
10.Reconnectthewirestothecompressorandcapacitor.Pluginandturnontheunit.Ifthecompressorfailsto
start,replacetheruncapacitor.
11.Iftheunitstilldoesnotstart,addingahard-startkit(relay&capacitor)willprovidegreaterstartingtorque.Ifthis
doesn'twork,thecompressorhasaninternalmechanicaldefectandmustbereplaced.
Troubleshooting