Operation; Maintenance - Honeywell HE420A Manual

Table 3. Recommended Frost Factor Settings.
Humidity Level Recommended Adjustment
Insufficient Increase the frost factor dial by
humidity one setting.
Condensation on Decrease the frost factor dial by
windows one setting.

OPERATION

The HE420A,B and HE460A,B Humidifiers use the principle
that hot water creates water vapor. As dry air and vapor mix,
the relative humidity of the air rises. The humidity control
monitors the relative humidity and activates the humidifier
accordingly.
When the humidity control calls for humidity, the humidifier
underwater heater starts heating the water in the humidifier
reservoir. When the water is warm enough, the humidifier
activates a relay that turns on the furnace fan. The warm dry
air from the furnace picks up the water vapor and circulates
it through the home. The fan continues to circulate the air
until the water cools down and then turns off the fan.
Humidified air feels warmer and more comfortable so you
may be able to lower the thermostat heating setpoint and
save money on heating fuel bills giving you a more
comfortable environment that is also energy efficient.

MAINTENANCE

A regular maintenance program prolongs the life of the
humidifier and provides a more comfortable environment.
Frequency of cleanings depends on water conditions. Either
hard or soft water can be used in the humidifier, but hard
water mineral deposits are more difficult to clean.
CAUTION
Voltage Hazard.
Can cause electrical shock and equipment
damage.
Disconnect power supply before installing or
servicing.
IMPORTANT
Never oil any part of the humidifier.
Every 1 to 4 Months
(Depending on Water Quality)
Use the following procedure and refer to Fig. 12 to clean the
humidifier:
1. Unplug the humidifier and fan control.
2. Disconnect the humidity control wires from the external
screw terminals on the humidifier.
3. Turn off the water supply.
HE420A,B AND HE460A,B STEAM POWER HUMIDIFIERS
HEATER
SAFETY
FLOATSWITCH
Fig. 12. Location of humidifier parts.
4. Disconnect water feed tubing at the float valve.
5. Disconnect the overflow at the humidifier.
IMPORTANT
Allow water to cool before continuing.
6. Use an appropriate coin and very slowly turn the
automatic flushing timer indicator clockwise. See
Fig. 13. Allow the humidifier to drain completely.
SLOT FOR COIN
TURN CLOCKWISE VERY SLOWLY
Fig. 13. Turn automatic flushing timer
indicator clockwise.
7. Remove the humidifier from the mounting.
8. Use running tap water to flush loose minerals from the
reservoir.
9. Carefully rub off minerals from the float, heater and
safety float switch.
NOTE: Steel wool or other scouring pads can be
used on the reservoir walls and other parts.
10. Remove the valve arm by pulling out the center pin
attachment. Inspect the arm for mineral buildup and
deterioration.
9
HUMIDITY
CONTROLS
COIN
M10552
FLOAT
VALVE ARM
RESERVOIR
M12310B
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