Humidifier Operation - Air King AK4500 Installation, Operation, & Maintenance Instruction

HUMIDIFIER OPERATION

ROTATING DRUM HUMIDIFIER
Because this rotating drum humidifier utilizes a water
pan/reservoir the unit is 100% efficient, all the water used is
delivered to the air. For this reason the unit does not have to be
interlocked with the furnace cycles, the drum can rotate
whether the furnace is heating or not, no water will be wasted
and the humidistat will control the amount of moisture
delivered to the air.
CONTROLLING THE HUMIDITY LEVEL
The mechanical humidistat supplied with this unit is to control
the amount of moisture added to the air in your home – It will
sense the relative humidity level in the air and work as an
ON/OFF switch to control the humidifier, regardless of whether
the furnace is running.
At the beginning of the heating season it may take sometime to
build up the relative humidity level in your home to the desired
level – For the first few weeks turn the humidistat up high to
ensure the humidifier will run. After you feel that you have
achieved the desired relative humidity level turn the humidistat
down until it cycles the humidifier OFF. The humidifier will then
work to maintain the relative humidity at that level.
ACHIEVING AND MAINTAINING A HUMIDITY LEVEL
Outside conditions are the primary factor affecting the humidity
level in your home. The colder it gets outside the less moisture
the outside air will have, your home brings in the outside air
and the humidifier will work to add moisture to it. As outside
conditions change the humidity level in your home will change
as well. Other factors which will affect humidity levels in the
home include, how many air-changes your ventilation system
delivers, the amount of people occupying the home, air leaks,
the use of showers, exhaust fans, HRV's, and the use of
fireplaces or wood stoves.
SAFELY OPERATING A FURNACE HUMIDIFIER
Proper control of the relative humidity level in the home is key to
ensuring good Indoor Air Quality (IAQ) for your home as well as
protecting against moisture damage.
Although a relative humidity environment of 45 to 50% may be
desirable, setting your humidistat at that point when outside air
temperatures are below 30˚F (-1˚C) can cause condensation on
windows and walls. Continued condensation for extended
periods of time may result in structural damage. Use the chart
below as a guide for maximum relative humidity settings at the
different outdoor air temperatures.
RECOMMENDED MANUAL HUMIDISTAT SETTINGS
OUT SIDE AIR TEMPERATURE MAXIMUM RELATIVE HUMIDITY SETTING
-20°F /-30°C
-10°F /-25°C
0°F / -20°C
+10°F/ -10°C
+20°F/ -5°C
30%F/ 0˚C
ABOVE
If condensation continues to form on windows at these settings
reduce the humidistat setting by successive 5% increments. After
each reduction in setting allow 6 hours for equilibrium to be
reached before readjustment.
If condensation persists with progressively lower settings made
during a 3 day period turn off the water supply at the saddle
valve, turn the humidistat to OFF and consult your heating
contractor.
When your house is unoccupied for longer than 3 days during
the winter always set the humidistat down to 15% so that severe
weather during your absence will not result in condensation
which may cause damage to your home.
SUMMER SHUT DOWN
During the summer season the humidity level in the air is quite
high. Therefore it is advisable to shut off the humidifier system.
Complete the following steps at the end of the winter season.
1. Close the water supply at the saddle valve.
2. Turn the humidistat knob to the OFF position.
3. Empty and clean the water pan.
4. Close the bypass air damper.
CARE AND MAINTENANCE
Because drum humidifiers utilize a water pan/reservoir they are
susceptible to water deposits and mineral build up, for this reason
we strongly recommend that the yearly maintenance include
• Replacing the evaporator pad
• Cleaning/replacing the float & valve assembly
• Cleaning/replacing the water pan
If you complete all the above tasks at once the amount of time
involved will be greatly reduced and your humidifier will
continue to work at peak efficiency.
Furnace Humidifier
15%
20%
25%
30%
35%
40%
45% MAXIMUM
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