Lifebreath 200ERVD - Manual (Page 27)

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Cause
• Mesh on outside hood is plugged
• Filters plugged
• Cores obstructed
• House grilles closed
• Dampers closed
• Low voltage at site
• Ductwork too long, excessive number of bends
• Improper speed control setting
• Improper balancing of ERV airflows
• Poor location of air supply grilles, cause
discomfort
• Outdoor temperature below 25°F (-4°C)
• Excessive infiltration through house leakage
• ERV speed set too high
• Dehumidistat set too low
• ERV improperly balanced
• Lifestyle of occupants, generate little indoor
humidity
• Dehumidistat is set too high
• ERV speed set too low
• ERV not operating continuously
• Presence of strong sources of moisture: indoor
pool, hot tub, unvented crawl space
• Improper connection
• Wiring to remote dehumidistat may have been
damaged by staple or nail
• Dehumidistat may be turned off
• ERV operating at too low speed
• ERV not properly balanced
• ERV undersized, allowing indoor humidity to rise
• Incomplete vapor barrier on insulated duct
• Tear or hole in vapor barrier on insulated duct
TROUBLESHOOTING YOUR ERV SYSTEM
Symptom
Poor air flow
Supply air inlet feels cold (a
problem if it affects the
occupant in the normal living
environment, not just cold air
at the supply grille itself
Humidity levels are too low
Humidity levels are too high
Dehumidistat not working
ERV or ducts to indoors frosting
Condensation or frost in insulated
duct to exterior
Solution
• Clean exterior hoods or vents
• Remove and clean filters
• Remove and clean core (vacuum or blow out;
do not wash)
• Open and adjust grilles
• Open and adjust dampers
• Have electrician check voltage
• Have HVAC contractor check ducting
• Increase speed setting
• Have HVAC contractor re-balance system
• Relocate air supply grilles so airflow does not
affect occupant. Adjust grille so that airflow is
entrained along wall or ceiling. (Note, closing the
grille too far will cause the air to be directed
downward from a ceiling, rather than along the
ceiling.
• A small duct heater may be added to the supply
air ducting to boost temperature. If supply air is
ducted to the furnace return, the furnace fan may
not need to run at low speed continuously.
• Weather-strip, caulk and seal opening through
wall, ceiling, at doors and windows to the
exterior.
• Lower ERV speed setting.
• Set dehumidistat higher.
• Have HVAC contractor re-balance system.
• May need to install a humidifier.
• Lower dehumidistat setting.
• Set ERV speed higher.
• Operate ERV continuously.
• Maintain cover on pool, hot tub when not in use.
Note: an ERV is not designed to provide
dehumidification of indoor pools, etc.
• Consider an HRV instead.
• May need to install and/or operate additional
exhaust fans for use in kitchens and baths for
short durations.
• Check that correct terminals have bee used.
• Check wiring for a short.
• Set dehumidistat to desired level.
• Set ERV to higher speed
• Have HVAC contractor re-balance system.
• Add additional ventilation, or change to HRV,
ERV recommended for regions where the
temperature does not drop below -4°C (25°F).
• Replace or repair tears, holes in vapor barrier,
tape all joints in outer covering