Set Water Level; Finish Mounting And Plumbing Humidifier; Installing Automatic Flushing Timer; Checking The Installation - Honeywell HE420A Manual

8. Flush the copper tubing to remove any debris that can
cause problems at the float valve.
9. Route the tubing to the humidifier float valve, keeping the
tube away from sharp edges.
10. Connect the remaining end of the tubing to the humidifier
float valve.
11. Open the saddle valve so that the water flows slowly and
gently into the water pan.

SET WATER LEVEL

Adjust the humidifier water level prior to mounting.
1. Set the humidifier reservoir on a level surface.
2. Attach the water feed line and allow the unit to fill until the
float valve shuts off the incoming flow of water. The water
level should be between 2-1/4 in. (57 mm) and 2-1/2 in.
(64 mm) deep. If water level is correct, go to step 4.
3. Adjust the water level in small increments. Raise the
water level by pushing down on the center of the float
arm. Lower the water level by pressing the float down
with one hand and pulling up on the center of the float
arm with the other hand. See Fig. 6.
CAUTION
Flooding Hazard.
Inadequate support of the float arm can lead to
valve seat damage and result in water leakage.
Support the float arm during adjustment.
TO RAISE WATER LEVEL
PUSH
DOWN
Fig. 6. Adjust water level.
4. Verify the water level by removing enough water to allow
the float valve to automatically fill and shut off the water.
FINISH MOUNTING AND
PLUMBING HUMIDIFIER
1. Mount humidifier as instructed in the Select Location and
Mount section.
2. Route the tubing to the humidifier float valve.
3. Connect the remaining end of the tubing to the humidifier
float valve.
4. Open the saddle valve so that the water flows slowly into
the water pan.
5. Check the compression fittings at the saddle valve and
the float valve. Tighten the fitting slightly to stop any
leakage.
IMPORTANT
Keep all drain lines away from sharp edges.
TO LOWER WATER LEVEL
HOLD
DOWN
PUSH
UP
M10581A
5
HE420A STEAM POWER HUMIDIFIER
6. Connect the overflow provision of the humidifier to a suit-
able waste drain.
NOTE: A 5/8 in. (16 mm) ID garden hose can be easily
attached to the overflow fitting.
7. Support the drain line at several locations to prevent
kinks. Be sure to provide support near any heat source.
8. Use a male 1-1/2 in. NPT fitting (not supplied) to connect
the overflow provision of the humidifier.
INSTALLING THE AUTOMATIC
FLUSHING TIMER
Refer to the "Installation Instructions for the Programmable
Humidifier Automatic Flushing Timer" for complete instruction.

CHECKING THE INSTALLATION

After installation is complete, use the following procedure to
check the humidifier operation:
1. Turn on the humidifier water supply.
2. Be sure the humidifier has power and plug in the humidifier.
3. Turn the Convertible Humidity Control to the Test
position.
4. Check that the furnace blower comes on to circulate the
moist air. The blower may take as long as fifteen minutes
to turn on.
5. Reset the Automatic Humidity Control to the desired dial
setting for automatic operation.

OPERATING THE HUMIDIFIER

The Honeywell HE420A Humidifier is controlled by an
Automatic Humidity Control. The Automatic Humidity Control is
mounted in the return air duct where it can be exposed to the
air stream of the return air, and is designed to automatically
adjust the humidity level based on indoor temperature and
humidity, inferred or measured outdoor temperature, and the
dial setting. The control allows for variations in furnace size,
window insulation and average daily climate temperature.
The Automatic Humidity Control requires an initial adjustment
period. Set the frost factor dial on 5 and use Table 2 to adjust
the dial–only one setting at a time–increasing the dial setting if
you feel you need more humidity, or reducing the setting if you
see moisture on the inside of your windows. For more precise
humidity adjustment, set the dial between dial settings. Allow
two days for the humidity level to subside before making
further adjustments. Once you have tuned in the proper
setting, you should not have to further adjust it again. The
control takes over and makes any future adjustments caused
by varying outdoor temperatures, thus reducing moisture
buildup on windows while maintaining the optimal humidity
level.
The Automatic Humidity Control can also be set for manual
operation. Once the control is installed in the cold air return
and internally set to MANUAL, turn the dial to the expected
outdoor temperature. The corresponding optimal humidity level
has been calibrated for you. For example, by setting the dial to
68-0192—4