aldes H/E240 - Page 40

Residential HRV/ERV
40
Supply air feels
cold
• Outdoor temperature
is extremely cold.
• Supply grille is located
close to occupants
• HRV automac defrost
funcon is not working
• Locate the supply grilles
high on the walls, or in the
ceiling with a diuser.
• Reduce the operang speed
of the HRV
• Install a small duct heater
(1 kW) behind the supply
grille.
• If supply air is ducted
through the furnace
plenum, ensure that the
HRV and furnace fan are
interlocked.
Wall
Dehumidistat is
not working
• The wall control is not
set properly
• Outdoor RH is higher
than the control
setpoint
• Bad low voltage
connecon or
interrupon (due to
a nail in the wall, for
example).
• For control 611224, ensure
that knob is turned to a
lower setpoint than outdoor
RH.
• For control 611242-FC,
ensure that the AUTO
mode is selected and the
target RH level is below the
outdoor RH.
• For control 611227, ensure
the wall control is not
OFF and that the target
RH setpoint is below the
outdoor RH.
• Check wiring from HRV to
wall control for open/short
circuit.
Indoor air is
too dry (note:
an HRV is not a
dehumidier,
however by
exchanging
indoor air with
outdoor air,
it can reduce
excess indoor
humidity if the
outdoor air is
drier).
• Dehumidistat wall
control is set too low
• HRV operang speed is
too high
• Improperly balanced
HRV
• Increase setpoint of
dehumidistat.
• Operate HRV at low speed.
• Call a contractor to balance
the HRV airows
• Add moisture to air with a
humidier