Honeywell HE420A installation instructions Humidistat Operating Instructions, Humidistat Checkout

Installing the Humidistat to Operate Manually

1.Locate the three-pin arrangement marked AUTO/ MAN protruding from the control board (right of wir- ing connections).

2.Pull upward to remove the black, two-pin connector from the auto position. Reinstall it in the manual position (on the center and right-hand pins).

CAUTION

Do not attach sensor wire to the blue wiring connection block.

3.Follow Steps 8 (select a power source) and 9 (Con- nect the humidistat to the humidifier) to complete the wiring. Apply the manual mode faceplate to the compensating humidistat cover. Reattach the cover to the base and reinstall the knob.

HE420A STEAM POWER HUMIDIFIER

Table 1. Humidity Settings.

Dial		Outdoor Temperature °F
Position	-10	0	10	20	30	40
4	15%	20%	25%	30%	35%	40%
5	20%	25%	30%	35%	40%	45%
6	25%	30%	35%	40%	45%	45%
7	30%	35%	40%	45%	45%	45%

Manual Operation

For MANUAL operation, apply the manual mode decal to the faceplate. Once the unit 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 an anticipated 20°F, the humidistat automatically maintains the indoor relative humidity in the safe, comfortable 35% range (see Table 2 below).

HUMIDISTAT OPERATING

INSTRUCTIONS

With automatic humidity control, you can control your humidifier almost effortlessly, because:

•Once the knob has been set, the humidistat automatically adjusts the indoor relative humidity based on outdoor temperature and your desired humidity level.

•The humidistat calculates the optimal humidity so you don't have the problems associated with indoor condensation.

•The humidistat’s temperature condensation capability automatically turns itself on in cold weather, off in warm weather.

•The humidistat’s humidity and temperature sensors are solid-state, which means there are no mechanical parts, and no problems associated with dust.

Automatic Operation

Once the humidistat is installed in the cold air return and internally set to AUTOMATIC, turn the dial to 5 (the standard humidity control setting).

Allow the humidity to stabilize for at least two days (home size, furnace efficiency, and personal comfort preference may affect the length of time necessary). At that point, you may reset the dial to 6 for more humidity, or 4 for less humidity. Continue adjusting the dial until you reach your optimal indoor humidity level, and leave the dial in this position.

Remember that in AUTO mode, the dial is not showing relative humidity, but your preferred humidity setting based on Table 1.

Table 1. Humidity Settings.

Dial		Outdoor Temperature °F
Position	-10	0	10	20	30	40
1	10%	10%	10%	15%	20%	25%
2	10%	10%	15%	20%	25%	30%
3	10%	15%	20%	25%	30%	35%

Table 2. Recommended Relative Humidity.

Outside Temperature	Recommended RH
+40°F	45%
+30°F	40%
+20°F	35%
+10°F	30%
0°F	25%
-10°F	20%
-20°F	15%

In extreme cold weather, relative humidity must be reduced to prevent condensation on windows and interior surfaces. Otherwise, the excess moisture will eventually cause damage to your home.

Additional Features

•When outdoor temperature exceeds 50°F (10°C), the humidistat will function in Test mode only.

•When indoor relative humidity exceeds 45%, the humidistat will not operate.

•Test Mode—Manual test the humidistat by turning the knob to the far right. The unit will energize the internal relay for one minute, allowing you to confirm proper operation.

•Manual Off—In Manual mode, turn the humidistat OFF during warm months by turning the knob to the far left. (This is not necessary in Automatic mode.)

HUMIDISTAT CHECKOUT

IMPORTANT

If conditions exceed 50°F or 45 percent relative humidity, it may be necessary to perform this test.

1.To conduct a system test, ensure that 24 VAC is applied to the 24 VAC terminals of the compensat- ing humidistat.

2.Reattach the humidistat cover and knob to the base.

3.Rotate the knob on the humidistat clockwise to the “Test” position.

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