Bryant HEAT RECOVERY VENTILATOR HRVBB Troubleshooting Guide download pdf (Page 32)

Problem Possible causes and solutions

HRV runs at one

speed only

•Checkallswitches

settings.

•Iftheunitremains

formalfunctionsby

atthesamespeed,

varyingthe

callacontractor.

Damaged duct

insulation jacket

•Iftheinsulationiswetorhasanyicebuild-up,orif

there is water on the ﬂoor, replace and properly seal

the damaged insulation.

•Iftheinsulationisnotdamaged,useducttapetorepair

any punctures in the jacket.

Cold drafts in living

quarters

•Checkforblockageoftheexhaustairstream.

•Checkthecoreforfreezing.

•Iftheproblempersists,asktheinstallertoprovide

diffusers, relocate fresh air outlets, add additional

outlets or add a preheater, as appropriate.

Poor air quality or

excess moisture

throughout the

house

•Measurethehumiditylevels.

•Adjustthedehumidistat.

•Reducethesourcesofhumidity.

•RuntheHRVatahigherspeed.

•EnsurethattheHRVisoperatingproperly(checkairow

by using the trash-bag technique on page 13).

•Iftheproblempersists,callacontractor.The

HRV’s minimum continuous ventilation rate may be

inadequate.

Air too dry in winter •Adjustthedehumidistat.

•RuntheHRVonthelowestsetting.

•RuntheHRVintermittently.

•ConsiderhavingacontrolinstalledtoruntheHRV

intermittently.

•Thesensationofdrynessmaybecausedbychemicals.

Control the pollutant at the source.

•Considerinstallingahumidier(ifyoudoso,clean

it regularly).

•Considerinstallinganenergyrecoveryventilator(ERV),

which can help with humidity problems (see “Energy

recovery ventilators,” page 10). This is more expensive

than any of the above solutions. Some HRVs can be

converted to ERVs at less cost than for installing a

new unit.

Unusual noise and

vibrations

•

•

Oilthefanmotors(iftheyarenotself-lubricating)using

non-detergent motor lubricating oil.

Inspectandcleanthefanbladesandtheheat-exchange

core as required.

Iftheproblempersists,callacontractor.

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Bryant HEAT RECOVERY VENTILATOR HRVBB Troubleshooting Guide Page 32

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