Fantech SE704 Installation, operation and maintenance manual - page 18
18
TROUBLESHOOTING
Solutions
Causes
Problem
Insufficient water vapor generated
Sudden increase in humidity by cooking or
bathing
Sudden change in temperature
Storing too much wood for heating
Dryer vent exhaust is inside home
Poor air circulating near windows
HRV not operating (during winter)
Poor air circulating near windows
Air is too dry
Air is too humid
Persistent condensation
on window
Install humidifier
Ventilate at the source of the problem using a HRV or additional fan
Wait until outside temperature stabilizes (winter). Heating will also
improve situation.
Store a majority of your wood outside. Even dried, a cord of wood con-
tains more than 20 gallons of water.
Arrange outside vent for dryer.
Open curtains or blinds. Bay or bow windows may require mechanical
method.
Check power to the unit
Open curtains or blinds. Bay or bow windows may require mechanical
method.
-Clean exterior hoods or vents
-Remove and clean filter
-Remove and clean core
-Check and open grilles
-Have electrician check supply voltage at house
-Check duct installation
-Locate the grilles high on the walls or under the baseboards, install
ceiling mounted diffuser or grilles so as not to directly spill the supply
air on the occupant (eg. Over a sofa)
-Use superior grilles such as Fantech CG grille A small duct heater
(1kw) could be used to temper the supply air
-Placement of furniture or closed doors is restricting the movement of
air in the home
-If supply air is ducted into furnace return, the furnace fan may need to
run continuously to distribute ventilation air comfortably
-Note: minimal frost build-up is expected on cores before unit initiates
defrost cycle functions
-Have HVAC contractor balance the HRV/ERV
-Install duct heater
-Tape and seal all joints
-Tape any holes or tears made in the outer duct covering
-Ensure that the vapor barrier is completely sealed.
-1/4” (6mm) mesh on the outside hoods
is plugged
-Filters plugged
-Core obstructed
-House grilles closed or blocked
-Dampers are closed (if installed)
-Poor power supply at site
-Ductwork is restricting HRV/ERV
Poor Air Flows
-Poor location of supply grilles, the airflow
may irritate the occupant(s)
-Outdoor temperature extremely cold
Supply air feels cold
-HRV/ERV air flows are improperly
balanced
-Malfunction of the HRV/ERV defrost
system
-Outdoor temp. extremely cold
HRV / ERV and / or
Ducts Frosting up
-Incomplete vapor barrier around
insulated duct
-A hole or tear in outer duct covering
Condensation or Ice
Build Up in Insulated
Duct to the Outside