Lifebreath RNC Série Mode D'emploi page 43

Troubleshooting
SYMPTOM
Poor airflows
Supply air feels cold
Dehumidistat in not
operating
Humidity levels are too high
condensation is appearing
on the windows
Humidity levels are too low
HRV and/or ducts frosting
up
Condensation or ice build up
in insulated duct to the
outside
Excess water in the bottom
of the HRV
Excessive Vibration
CAUSE
 1/4 in (6 mm) mesh on outside
hood is plugged
Filters plugged

Core obstructed

 House grills 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
 Outdoor temperature is above
o o
15 C (59 F)
 Improper low voltage connection
External low voltage is shortened

out by a staple or nail
Check dehumidistat setting it may

be on OFF
 Dehumidistat is set too high
HRV is not sized to handle a hot

tub, indoor pool etc.
 Lifestyle of the occupants
 Moisture coming into the home
from an unvented or unheated
crawl space
 Moisture is remaining in the wash
room and kitchen areas
Condensation seems to form in

the spring and fall
HRV is set at too low a speed

 Dehumidistat control set too low
 Blower speed of HRV is too high
Lifestyle of occupants

 HRV airflows may be improperly
balanced
 HRV airflows are improperly
balanced
 Malfunction of the HRV defrost
system
 Incomplete vapor barrier around
insulated duct
 A hole or tear in outer duct
covering
 Drain pans plugged
Improper connection of HRV's

drain lines
 HRV is not level
 Drain lines are obstructed
 HRV heat exchange core is not
properly installed
Dirt on fan wheels

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

 Check duct installation
Increase the speed of the HRV

 Have contractor balance HRV
Locate the grilles high on the walls or under

the baseboards, install ceiling mounted diffuse
or grilles so as not to directly spill the supply
air on the occupant (i.e. over a sofa)
Turn down the HRV supply speed. A small

duct heater (1 kW) 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
 Dehumidistat is functioning normally (see Auto
Dehumidistat Disable in this manual)
 Check that the correct terminals have been
used
 Check external wiring for a short
Set the dehumidistat at the desired setting

 Set dehumidistat lower
Cover pools, hot tubs when they are not in

use
 Avoid hanging clothes to dry, storing wood
and venting clothes dryer inside. Firewood
may have to be moved outside
Vent crawl space and place a vapor barrier on

the floor of the crawl space
 Ducts from the washroom should be sized to
remove moist air as effectively as possible,
use of a bathroom fan for short periods will
remove additional moisture
 On humid days, as the seasons change, some
condensation may appear but the homes air
quality will remain high with some HRV use
Increase speed of the HRV

 Set dehumidistat higher
 Decrease HRV blower speed
Humidity may have to be added through the

use of humidifiers
 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
 Ensure damper defrost is operating during
self-test
 Tape and seal all joints
 Tape any holes or tears made in the outer
duct covering, ensure that the vapor barrier is
completely sealed
 Look for obstructions in the drain line
Look for kinks in the drain line

Have contractor service HRV

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