How the Dehumidistat Works
High indoor humidity levels, during the heating season, have become a problem in many well
insulated, tight homes, excessive condensation on the window is a visual sign of high indoor humidity
levels. High indoor humidity levels can result in mold and mildew and the eventual degradation of the
building structure itself.
Your HRV reduces indoor humidity levels when the outdoor air is drier than the indoor air. These
conditions usually occur during the heating season when outdoor temperatures are less than 15
o
C
(59
o
F). During the heating season, the operation of the HRV may reduce indoor humidity levels
sufficiently to eliminate the need for further dehumidification. If your home requires further
dehumidification, use the Dehumidistat feature located on the main control. This feature aggressively
addresses high indoor humidity levels by initiating high speed ventilation when the indoor humidity
levels rise above the adjustable set point on the control. Refer to "Setting the Dehumidistat" on page
6 of this guide for instructions on how to set the Dehumidistat. The Dehumidistat function should be
set to off for all seasons except the heating season because a dehumidifying effect occurs only when
the outdoor air is dryer than the indoor air.
Your
Life
breath
Digital Control
has an adjustable Dehumidistat which can be set to achieve a
further dehumidification effect from your HRV. High speed ventilation will be initiated upon exceeding
the Dehumidistat set point regardless of the mode and speed of operation. Once the humidity in the
house is reduced, the HRV will revert back to its previous setting.
We suggest operating the HRV for the first few days without use of the Dehumidistat function to
observe if a further dehumidification effect will be required. The Dehumidistat operates in % of RH
(relative humidity) with 60 being high and 20 being low. If after a few days, further dehumidification
is required (the house is still too humid), set the humidity level to a lower amount.
The average person is comfortable between 30% and 50% RH. The Dehumidistat should be set to
off for all seasons except the heating season.
Dehumidistat Disable
automatically disables the Dehumidistat function on the main control when outdoor
temperatures exceed 15
o
C (59
o
F) for a full 24 hour period. All other HRV features and functions operate normally
while the Dehumidistat function is disabled.
Dehumidistat Re-Enable
automatically re-enables the Dehumidistat function if either the outdoor temperature
drops below 15
o
C (59
o
F) for a full 24 hour period or if the HRV is reset (unplugged for 30 seconds).
4
Dehumidistat Notes
