Owner's Manual
APPENDICES
Symptom Cause Solution
Humidity
levels are
too high;
condensation
appears on
windows
Dehumidistat is set too high. Set dehumidistat lower.
Undersized ventilator to handle hot tub, indoor •
pool, etc.
Cover pools and hot tubs when not in use.•
Lifestyle of occupants.• Avoid hanging clothes to dry, storing wood and •
venting clothes dryer inside. Consider moving
wood outside.
Moisture coming into home from crawl space •
not vented or heated.
Vent crawl space and place vapor barrier on •
floor of crawl space.
Moisture is remaining in bathroom and kitchen •
areas.
Size bathroom ducts to remove moist air as •
effectively as possible; use bathroom fan to
remove additional moisture.
Condensation is forming in spring and fall.• On humid days, as seasons change, •
condensation appears but air quality remains
high with some ventilator use. Use a control that
provides ventilation in all seasons.
Ventilator speed is set too low.• Increase speed of ventilator.•
Ventilator airflow can be incorrectly balanced.• Have a contractor balance ventilator airflow.•
Humidity
levels too low
Dehumidistat control set too low.• Set dehumidistat higher.•
Blower speed of ventilator is too high.• Decrease ventilator blower speed.•
Lifestyle of occupants.• Increase humidity with humidifiers.•
Ventilator airflow can be incorrectly balanced.• Have a contractor balance ventilator airflow.•
Ventilator and/
or ducts have
frost buildup
Ventilator airflow is incorrectly balanced. • NOTE: Minimal frost build-up is expected on •
cores before unit initiates defrost cycle functions.
Have HVAC contractor balance ventilator.•
Malfunction of ventilator defrost system.• Have HVAC contractor check defrost system.•
Condensation
or ice buildup
in insulated
duct to
outside
Incomplete vapor barrier around insulated duct.• Tape and seal all joints.•
Tape any hole or tears made in outer duct •
covering.
Hole or tear in outer duct covering.• Ensure vapor barrier is completely sealed.•
Water in
ventilator
bottom
Drain pans are plugged.•
Improper connection of ventilator drain lines.•
Ensure O-ring on drain nozzle adjusted correctly.•
Look for kinks in line.•
Ventilator is not level.• Level ventilator.•
Drain lines are obstructed.• Check water drain connections.•
Ventilator heat exchange not correctly installed.• Make sure water drains correctly from pan.•
HR150, 200; ER150, 200 Perfect Window™ Fresh Air Ventilation Systems 68-0171—12
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