Aprilaire 720 Series - Effect of Water Characteristics; Fan Speed; Annual Maintenance; Annual Summer Shutdown

EFFECT OF WATER CHARACTERISTICS
Your humidier is designed to operate using cold, hot, hard,
or soft water. Depending on the mineral content of your water
source, annual replacement of the orice and cleaning of
the valve may be necessary to ensure your humidier is
maintaining efciency throughout the heating season. Installing
a scale-reducing inline water lter is recommended to lessen
the effects of hard water.
Water contains varying amounts of minerals. The residue
remaining as a result of hard water evaporation is primarily
calcium and magnesium components and is usually quite hard,
scaly, and dense. Residue from softened water tends to be soft
and uffy and has a greater volume than hard water deposits.
At the end of a humidication cycle, most of the mineral solids
are ushed down the drain.
In either case, the service life of the HydroCore will be the same.
The HydroCore should be changed at least once per year. Units
installed on hard water require annual replacement of the
orice (see page 7).
FAN SPEED
The fan speed of the unit can be switched from HIGH (default)
to LOW if noise is a concern. Note that lowering the fan speed
will also decrease capacity by approximately 10%. Low speed is
recommended if the unit is installed near the living space or if
the humidier is installed to run independent of a heat call.
1. Take note of the humidier control set point and turn the dial
to OFF position.
2. Grip the handle on the front cover and slide the latch. Rotate
the cover away from the assembly and pull away from the
base and set aside (see FIGURE 4).
3. Toggle the fan switch to HIGH (+) or LOW (-) (see FIGURE 5).
4. Replace cover and turn the humidier control dial back to the
desired set point.
ANNUAL MAINTENANCE
For best performance, replace the HydroCore in your AprilAire
Humidier at least annually. Detailed instructions can be
found on page 7.
The Change Water Panel indicator light (Digital Control only,
see page 4 for details) will blink when it is time to change your
HydroCore.
To purchase a new Genuine AprilAire HydroCore:
• Call the installer of your AprilAire Humidier. This information is
often found on your equipment.
• Call your HVAC contractor.
• Use our Find a Pro tool at aprilaire.com.
• If none of the above is successful and you still need
information, contact Customer Service at 800.334.6011.
ANNUAL SUMMER SHUTDOWN
Humidier Control: Set the humidier control dial to the OFF
position.
Thermostat with IAQ Control: Set the humidier mode to OFF
when seasonal humidication is no longer desired.
MAINTENANCE INSTRUCTIONS
Periodic inspection and preventative maintenance of your total
heating system is important for efcient and safe operation.
Your HVAC contractor can service your humidier when they
service your HVAC system.
HydroCore
Model
Replacement
Cartridge
Hard Water
Kit*
Works With
L HYDROL HYDRLH 720
FIGURE 4:
FIGURE 5:
90-02817
*Includes replacement orice and seal cap
6 English