20
Control Functions
Symptom
Possible Cause
Possible Solution
Poor air quality
excess moisture
on windows.
HRV turned off
HRV running on too low a speed
Adjust ventilation rate higher and
monitor conditions overnight.
Adjust further if necessary.
If HRV is connected to furnace
ductwork (both exhaust and
supply)
Temporary conditions causing
effect.
Ensure that furnace is turned on to
circulate air.
Activate to high speed at push button
or Airmonitor.
Excessive humidity conditions
within home. Turn down
internal or remote dehumidistat.
Consider source such as improper
foundation drainage, moisture
intrusion into exterior walls, moisture
generation, excessive moisture
conditions.
New wet construction.
Indoor air temperature too low.
Keep temperature above 18°C (64°F)
Indoor air
considered too
dry
HRV speed selection too high
for conditions.
Set to a lower speed.
Check dehumidistat settings. Adjust
higher. Set to intermittent mode
of operation. Temporarily use a
humidifier.
Excessive frost
build up on ducts
connected to
HRV.
Supply air too
cold.
Extreme outdoor air
temperatures.
Operate HRV on intermittent.
Operate HRV at a lower ventilation
rate.
Have a duct heater installed.
Imbalance in air flow streams.
Have the system’s balancing checked.
Defective defrost system.
Have the defrost system checked.
Defective Vapor Barrier.
Inspect duct connections at collars,
look for vapor tear and repair.
Summary of Contents for SHRV 100T
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