Bryant HEAT RECOVERY VENTILATOR HRVBB Troubleshooting Guide download pdf (Page 18)

FIGURE 4

Effects of air pressure on a house

Although your HRV was balanced during installation, have the

system checked by a qualiﬁed contractor once a year. If you are

purchasing an existing home equipped with an HRV, consider

having the system serviced, including a balance test.

Do-it-yourself balance check

You can perform your own rough check of your HRV’s airﬂow

balance by using the trash-bag technique explained on page 13. In

this case, tape the open end of an extra-large trash bag (i.e., the type

used for leaf collection) to a coat hanger. Place the deﬂated bag over

the HRV’s exhaust hood, located on the outside of your house, and

time how long it takes for the bag to ﬁll with air. Then hold the

inﬂated bag over the HRV’s air intake hood and time its deﬂation.

On a well-balanced system, inﬂation and deﬂation times should be

equal, to within a matter of seconds.

Example of positive

household air pressure

Example of negative

household air pressure

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Bryant HEAT RECOVERY VENTILATOR HRVBB Troubleshooting Guide Page 18