Bryant HEAT RECOVERY VENTILATOR HRVBB Troubleshooting Guide download pdf (Page 12)

Energy recovery ventilators

Energy recovery ventilators (ERVs) are a type of HRV that can

exchange both heat and moisture. An ERV can give you more

control over moisture levels in your home during warm and

humid weather, which could be important in your climate.

During the cooling season, ERVs help keep excess moisture out

of your home by allowing it to pass through the HRV core. The

incoming moist air then transfers the moisture to the outgoing

exhaust air. Because less energy is required to lower the

temperature of dry air compared to moist air, an ERV can reduce

the load on your air conditioner and save you money.

On the other hand, if your winter climate is extremely dry,

ERVs recover some of the moisture that would be exhausted

to the outdoors by a regular HRV. This helps you maintain a

comfortable humidity level within your home, avoiding static

electricity, sore throats and other discomforts caused by air that

is too dry. (This dryness could be caused by over-ventilation,

which might indicate that the HRV is oversized or needs to be

slowed down.)

Air distribution

The two standard ways to distribute fresh air throughout the home

are through the ductwork installed for the HRV (a direct-ducted

system) or through the ductwork of a forced-air furnace system.

A direct-ducted system is often found in homes that do not have

forced-air heating, such as those with electric baseboard, hot water

or radiant heating. In this system, the fresh air is distributed through

ducts to the bedrooms, living room, dining room, basement and

other rooms, where it disperses throughout the house (see Figure 2).

Exhaust air ducts take the stale air from rooms that have high

moisture and pollutant sources back to the HRV and, from there,

to the outdoors.

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Bryant HEAT RECOVERY VENTILATOR HRVBB Troubleshooting Guide Page 12