Troubleshooting - Fantech SHR 1504 Operation Manual

TROUBLESHOOTING

Problem
Air is too dry
Air is too humid
Persistent condensation
on window
Poor Air Flows
Supply air feels cold
HRV / and / or Ducts
Frosting up
Condensation or Ice Build
Up in Insulated Duct to
the Outside
Causes
Dehumidistat control is set too low
HRV out of balance
Dehumidistat control is set too high
Sudden change in temperature
Storing too much wood for heating
Dryer vent exhaust is inside home
Poor air circulating near windows
HRV out of balance
Well sealed basement door is closed
Improper adjustment of dehumidistat control
HRV out of balance
-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
-Improper speed control setting
-HRV airflow improperly balanced
-Poor location of supply grilles, the airflow
may irritate the occupant
-Outdoor temperature extremely cold
-HRV air flows are improperly
balanced
-Malfunction of the HRV defrost
system
-Incomplete vapor barrier around
insulated duct
-A hole or tear in outer duct covering
Solutions
Increase the desired level of humidity. Change ventilation
mode from continuous mode to standby.
Have contractor balance HRV airflows
Reduce the desired level of humidity. Combine this with the
use of continuous exchange mode.
Wait until outside temperature stabilizes (winter). Heating will
also improve situation.
Store a majority of your wood outside. Even dried, a cord of
wood contains more than 20 gallons of water.
Arrange outside vent for dryer.
Open curtains or blinds. Bay or bow windows may require
mechanical method.
Have contractor balance HRV airflows
Open the door or install a grill on the door.
Reduce the desired level of humidity. Combine this step with
use of continuous exchange mode.
Have contractor balance HRV
-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
-Increase the speed of the HRV
-Have contractor balance HRV airflows
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)
-Turn down the HRV supply speed. 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
-Have contractor balance HRV airflows
-Note: minimal frost build-up is expected on cores before unit
initiates defrost cycle functions
-Have HVAC contractor balance the HRV airflows
-Tape and seal all joints
-Tape any holes or tears made in the outer duct covering
-Ensure that the vapor barrier is completely sealed.
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