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TROUBLESHOOTING (TABLE 3)
.
Symptom
Poor
•
Plugged outside hood 1/4 in. (6 mm) mesh.
airflow
•
Filters plugged.
•
Core obstructed.
•
House grilles closed or blocked.
•
Dampers (if installed) are closed.
•
Poor power supply at site.
• Ductwork is restricting airflow.
•
Improper speed control setting.
• Ventilator airflow improperly balanced.
Supply air feels
• Poor location of supply grilles, airflow can
cold
irritate the occupant.
• Outdoor temperature extremely cold.
Dehumidistat is
• Incorrect connection to external 24-volt control.
not operating
• Staple/nail is shorting out external low voltage.
• Check dehumidistat setting; it could be at Off. • Set dehumidistat at the desired setting.
Humidity
• Dehumidistat is set too high.
levels are too
• Undersized ventilator (hot tub, indoor pool, etc) • Cover pools and hot tubs when not in use.
high; conden-
• Lifestyle of occupants.
sation appears
on windows
• Moisture coming into home from crawl space
not vented or heated.
• Moisture is remaining in bathroom and kitchen
areas.
• Condensation is forming in spring and fall.
• Ventilator speed is set too low.
Humidity levels
• Dehumidistat control set too low.
too low
• Blower speed of ventilator is too high.
• Lifestyle of occupants.
• Ventilator airflow can be incorrectly balanced. • Have a contractor balance ventilator airflow.
Ventilator and/
• Ventilator airflow is incorrectly balanced.
or ducts have
frost buildup
• Malfunction of ventilator defrost system.
Condensation
• Incomplete vapor barrier around insulated duct. • Tape and seal all joints.
or ice buildup
in insulated
• Hole or tear in outer duct covering.
duct to outside
HR150B, HR200B PERFECT WINDOW™ FRESH AIR VENTILATION SYSTEMS
Table 3. Troubleshooting Guide.
Cause
11
Solution
• Clean exterior hoods or vents
• Remove and clean filter.
• Remove and clean core.
• Check and open grilles.
• Open and adjust dampers
• Have electrician check supply voltage at house.
• Check duct installation.
• Increase speed of ventilator.
• Have contractor balance ventilator airflow.
• Locate grilles high on walls or under baseboards; install
ceiling-mounted diffuser or grilles to avoid blowing directly
on occupants (example: over a sofa).
• Turn down ventilator supply speed. Use a small duct heater
(1kW) to temper the supply air.
• Placement of furniture or closed doors is restricting
movement of air in the home.
• If supply air is ducted in furnace return, run furnace fan
continuously to distribute ventilation air comfortably.
• Check that correct wires were used.
• Check external wiring for a short.
• Set dehumidistat lower.
• Avoid hanging clothes to dry, storing wood and venting
clothes dryer inside. Consider moving wood outside.
• Vent crawl space and place vapor barrier on floor of crawl
space.
• Size bathroom ducts to remove moist air as effectively as
possible; use bathroom fan to remove additional moisture.
• On humid days, as seasons change, condensation appears
but air quality remains high with some ventilator use.
• Increase speed of ventilator.
• Set dehumidistat higher.
• Decrease ventilator blower speed.
• Increase humidity with humidifiers.
NOTE: Minimal frost build-up is expected on cores before
unit initiates defrost cycle functions.
• Check operation of dampers in exhaust vent; damper vanes
may be held open or damaged.
• Have HVAC contractor balance ventilator.
• Have HVAC contractor check defrost system.
• Tape any hole or tears made in outer duct covering.
• Ensure vapor barrier is completely sealed.
68-0285
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