Bryant HEAT RECOVERY VENTILATOR HRVBB Troubleshooting Guide download pdf (Page 17)

pulled back into the house, where you could inhale them. Negative

pressure can also increase the rate of entry of undesirable gases

and moisture from the soil surrounding the basement (see Table 1,

“Common pollutants and their sources,” on page 6). Either

scenario can threaten the health of the occupants.

Pulling more air into the home than is exhausted creates positive

household air pressure, though. This excessive pressure can cause

moist air from the home to be pushed into the walls and roof,

where it can condense and lead to the deterioration of the building

materials. This hidden problem often goes undetected until

severe damage has been done. Positive pressure has other effects.

Moisture escaping through exterior door locks can freeze the lock

mechanism, making it difﬁcult for you to enter or leave the house.

Also, the HRV core can develop frost or freeze, restricting or

blocking further airﬂow (see “Heating season operation,” page 19).

Finding a contractor to service your HRV

To ﬁnd a qualiﬁed HRV contractor, look under Heating

Contractors or Ventilating Contractors in the Yellow Pages

or refer to the Web. When you contact one of the companies,

make it clear that you need the services of a residential

mechanical ventilation installer who has been certiﬁed by the

Heating, Refrigeration and Air Conditioning Institute of Canada

(HRAI). If you have difﬁculty ﬁnding a qualiﬁed contractor,

contact HRAI or, in Quebec, the Corporation des maîtres

mécaniciens en tuyauterie du Québec. Their contact information

is provided on page 32.

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Bryant HEAT RECOVERY VENTILATOR HRVBB Troubleshooting Guide Page 17