Lennox MPB012S4S Service Manual

93
Table 3. Status Indicators
Display Remark
47 IndoorunitFcapacitydemandcode Not used
48 IndoorunitFevaporatoroutlettemp.(T2BF) Not used
49 IndoorunitFroomtemp.(T1F) Not used
50 IndoorunitFevaporatortemp.(T2F) Not used
51 EXVopenangleforFindoorunit Not used
19.4. Outdoor Unit Digital Display Tube
ThereisadigitaldisplaytubeinoutdoorPCB.Digitaldisplaytubedisplayfunction
Table 4. Operation Display
Description
Instandby,theLEDdisplays“--”
Incompressoroperation,theLEDdisplaytherunningfrequency,
Indefrostingmode,TheLEDdisplays“dF”oralternativedisplaysbetweenrunningfrequencyand“dF”(eachdisplays0.5s)
Incompressorpre-heating,TheLEDdisplays“PH”oralternativedisplaysbetweenrunningfrequencyand“PH”(eachdisplays0.5s)
Duringtheoilreturnprocess,TheLEDdisplays“RO”oralternativedisplaysbetweenrunningfrequencyand“RO”(eachdisplays0.5s)
Inlowambientcoolingmode,theLEDdisplays“LC”oralternativedisplaysbetweenrunningfrequencyand“LC”(eachdisplays0.5s)
Inforcedcoolingmode,theLEDdisplays“FC”oralternativedisplaysbetweenrunningfrequencyand“FC”(eachdisplays0.5s)
WhenPFCmoduleprotectionoccursthreetimeswithin15minutes,theLEDdisplays“E6”oralternativedisplaysbetweenrunningfrequencyand
“E6”(eachdisplays0.5s)
Inprotectionormalfunction,theLEDdisplayserrorcodeorprotectioncode.
19.5. Dry Mode Operation - MWMA and MWMB
19.5.1. Procedure
1. PresstheMODE button to select DRY mode.
2. PresstheUP/ DOWNbuttontoselectthedesiredtemperature.Thetemperaturesettingrangeisfrom62°Fto86°Fin
one degree increments.
NOTE: The blower is preset at a low speed and cannot be changed therefore it will get cold and most likely will over
shoot the temperature setting by 6-10 degrees depending on the room size or other various factors. Also the
Follow Me mode does not operate in this mode. The Follow Me mode is only available when a return air sensor
is utilized. Typically in most cases the Follow Me mode will not be sufcient to remove excessive humidity.
Inaddition,theoutdoorunitsdonothaveahumidistatinstalledthereforetheyareunabletodeterminehumidity
levels.Thisproductisnotrecommendasamainsourcefordehumidication.
19.5.2. Dry Mode Operation Sequence
Whenindrymodeoperationtheunitisactuallyincoolingmodewithalowspeedbloweroperation.Thecompressorwillstop
whentheroomtemperatureistwodegreesCelsiuslowerthanthetemperaturesetting.
HoweverthereisatemperaturecompensationforcoolingmodethatistwodegreesCelsius.Sotheunitwillstopwhenthe
temperatureisfourdegreesCelsiuslowerthantheroomtemperaturesettings.
NOTE: Four degrees Celsius is equivalent to 8°F difference.
19.6. Test Run - MWDA and MWMB
Onlyperformtestrunafteryouhavecompletedthefollowingsteps:
• ElectricalSafetyChecks–Conrmthattheunit’selectricalsystemissafeandoperatingproperly
• GasLeakChecks–Checkallarenutconnectionsandconrmthatthesystemisnotleaking
• Conrmthatgasandliquid(highandlowpressure)valvesarefullyopen.

Lennox MPB012S4S Specifications

General

Brand	Lennox
Model	MPB012S4S
Category	Air Conditioner
Language	English