Bryant HEAT RECOVERY VENTILATOR HRVBB Troubleshooting Guide download pdf (Page 21)

Frequent or even continuous high-speed operation may be desirable

during the ﬁrst year after a house is built, to exhaust the moisture

and pollutants being released by new building materials.

An HRV is not an air cleaner and may not deal effectively with

extraordinary sources of indoor air pollutants (e.g., strong-smelling

glues), particularly if the pollutants are generated in a room that

is not exhausted directly to the HRV. In such cases, reduce the

activities that are generating the pollutants or install a dedicated

exhaust system.

Heating season operation

Most HRVs feature an automatic defrost mode that activates when

the temperature of the incoming fresh outdoor air is below -5°C.

A defrosting mechanism is required in cold climates because, as the

heat is extracted from the home’s outgoing moist air (to warm the

incoming fresh air), the temperature of the outgoing air drops to

the point at which moisture or frost can form on the surfaces of the

heat-exchange core. A build-up of frost can block airﬂow through

the HRV.

One defrost mechanism uses dampers to, temporarily, block the

incoming fresh air stream and allow warm air from the house

to circulate through the HRV, where it melts any frost that has

accumulated. The HRV returns to normal operation after this

automatic defrost cycle. As the outdoor air gets colder during the

winter, this cycle increases in duration.

To help minimize condensation on cold surfaces such as windows,

during the heating season, adjust your HRV’s dehumidistat

accordingly. You do not want the household air to be too dry

because this can cause static electricity and dry, scratchy throats.

If the air in your home is too dry during the heating season and

you have attributed this to the HRV’s operation, refer to the

“HRV troubleshooting guide” on page 29.

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Bryant HEAT RECOVERY VENTILATOR HRVBB Troubleshooting Guide Page 21