Honeywell Humidifier HE420A User Manual

READ AND SAVE THESE INSTRUCTIONS  
HE420A Steam Power Humidifier  
INSTALLATION INSTRUCTIONS  
APPLICATION  
The HE420A Steam Power Humidifier uses a thermal fan  
interlock control to provide humidification for the whole  
house. The steam power humidifier is designed to work  
with high efficiency furnaces and heat pumps.  
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INSTALLATION  
IMPORTANT  
This product is for residential applications only  
and must be installed by a qualified HVAC con-  
tractor. Failure to comply could invalidate the  
product warranty, or result in serious injury or  
electrocution.  
M10536B  
SELECT LOCATION AND MOUNT  
Fig. 1. Mount humidifier horizontally under duct  
using mounting bracket.  
WARNING  
Electrocution, Heavy Equipment and  
Chemical Hazard.  
Can cause death, blindness, water damage to  
home and heater failure.  
Do not cut into any air conditioning or  
electrical line.  
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Wear safety glasses when cutting or drilling.  
Mount the humidifier in a level position to  
avoid water damage and heater failure.  
Reinforce duct as necessary to ensure  
stability.  
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There are three typical ways of mounting the steam  
humidifier. See Fig. 1, 2, and 3. Be sure to select a  
location where the humidifier can be plugged in without  
an extension cord. The preferred installation location is  
on the warm air side of the furnace. If that location is not  
possible, the humidifier should be mounted a minimum of  
6 ft (1.8m) upstream from the furnace filter. Depending  
on the location selected, additional duct reinforcement  
may be necessary because the humidifier weighs 18 lb  
when filled with water.  
M10578B  
Fig. 2. Mount humidifier horizontally under duct.  
69-1108-2  
 
   
HE420A STEAM POWER HUMIDIFIER  
IMPORTANT  
Mount Horizontally On Reinforced Duct  
Position the valve so water flows from the top or  
side to reduce the chance of clogging the valve  
with minerals.  
Lightly clean the copper tubing ends with fine  
sandpaper before making any connections.  
Do not use any line connected to an air  
conditioner.  
This horizontal mounting method usually requires duct  
reinforcement to support the weight of the humidifier and  
keep it level. The mounting bracket is not used. See Fig. 2.  
1. Position the bracket to the bottom of the duct in the  
desired location. Be sure the bracket is level.  
2. Once the outline has been traced, remove bracket.  
3. Drill a 3/8 in. (10 mm) hole within the center portion  
of the bracket.  
4. Use tin snips to cut around the outline of the  
bracket.  
4. Install the chlorine removal filter.  
5. Place the brass compression nut over the copper  
tubing.  
6. Slide the brass ferrule over the tubing.  
5. Remove the sheet metal.  
NOTE: Do not overtighten the compression nut.  
Moderate tightness prevents leaking.  
IMPORTANT  
Do not mount the humidifier until the water level  
is adjusted. See the Plumbing section.  
7. Insert the tubing into the valve fitting and tighten the  
compression nut.  
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, keep-  
ing the tube away from sharp edges.  
6. Slide the flanges of the humidifier reservoir into the  
mounting bracket.  
7. Secure the humidifier to the duct with two no. 8  
sheet metal screws.  
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.  
Mount Horizontally On Vertical Duct  
Horizontal mounting on a vertical duct requires the  
installation of a duct extension. Additional duct  
reinforcement may also be necessary to help support the  
weight of the humidifier and keep it level. See Fig. 3.  
SET THE WATER LEVEL  
Create and install the duct extension. Follow the steps in  
the Mount Horizontally Using Mounting Bracket section to  
complete installation.  
CAUTION  
Flooding Hazard.  
Inadequate support of the float arm can lead to  
valve seat damage resulting in water leakage.  
Support the float arm during adjustment.  
WIRING  
All wiring must comply with local codes and ordinances.  
For complete wiring instructions, refer to the manual  
“Wiring Instructions for High-Capacity Steam Humidifiers”  
packaged with your HE420A humidifier.  
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, skip to step 4.  
PLUMBING THE HUMIDIFIER  
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 cen-  
ter of the float arm with the other hand. See Fig. 5.  
4. Verify the water level by removing enough water to  
allow the float valve to automatically fill and shut off  
the water.  
CAUTION  
Can cause damage to environment or air  
conditioning system.  
Do not use any refrigerant line connected to an air  
conditioner.  
Be sure to install the chlorine removal filter  
(provided) to prevent humidifier corrosion.  
Chemical Hazard.  
TO RAISE WATER LEVEL  
TO LOWER WATER LEVEL  
NOTE: Either hard or soft water can be used in the  
humidifier.  
PUSH  
DOWN  
HOLD  
DOWN  
IMPORTANT  
PUSH  
UP  
Use only copper tubing to plumb the humidifier.  
1. Locate the cold water pipe closest to the humidifier.  
2. Install the saddle valve connector.  
M10581A  
3. Use the valve instructions to install the valve (pro-  
vided). The valve is self-piercing when installed on  
copper pipe.  
Fig. 5. Adjusting the water level.  
3
69-1108—2  
 
 
HE420A STEAM POWER HUMIDIFIER  
Outdoor temperature sensor  
Sensor shield  
Manual mode faceplate  
Mounting bracket  
FINISH MOUNTING AND PLUMBING  
THE HUMIDIFIER  
2. Disassemble the humidistat. Pull knob off, then  
remove the cover by inserting a screwdriver in the  
slot on the right side of the humidistat.  
3. Mount the humidistat on the COLD AIR RETURN.  
Select a mounting location at least 6 inches  
upstream from the fresh air intake ductwork, if appli-  
cable.  
1. Mount the humidifier as instructed in the Select  
Location and Mount section.  
2. Route the tubing to the humidifier float valve.  
IMPORTANT  
Keep the tubing away from sharp edges.  
4. Select an exterior location to mount the Outdoor  
Temperature Sensor. Location must meet the fol-  
lowing requirements. Incorrect indoor humidity lev-  
els will result if these requirements are not met.  
3. Connect the remaining end of the tubing to the  
humidifier float valve.  
4. Open the saddle valve so 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.  
6. Connect the overflow provision of the humidifier to a  
suitable waste drain.  
Mount on North, Northeast or Northwest side of  
house.  
Mount at least 3 feet from all exhaust vents.  
Mount above expected snow line.  
NOTE: For manual operation, do not install the outdoor  
sensor wire.  
NOTE: 3/8 in. (9.525 mm) I.D. tubing can be easily  
attached to the overflow fitting.  
5. Locate an existing Indoor/Outdoor access hole.  
Make sure there are no active high-voltage  
wires in the hole.  
As an alternative, the sensor can be mounted in  
the center of a 6-inch fresh air intake duct (must  
be no farther than 30 inches from the outside  
wall).  
7. Support the drain line at several locations to pre-  
vent 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 humidifier overflow provision.  
NOTE: If neither configuration is possible, the compen-  
sating humidistat can be installed to operate  
manually. See Installing the Humidistat to Oper-  
ate Manually, below.  
INSTALL THE AUTOMATIC  
FLUSHING TIMER  
Refer to the “Installation Instructions for the  
Programmable Humidifier Automatic Flushing Timer” for  
complete instruction.  
6. Route the sensor wire to the selected location. Run  
wire between the compensating humidistat and the  
outdoor sensor lead. If the sensor is outdoors, snap  
the probe end of the sensor into the sensor shield  
and attach it to an exterior wall. The probe must be  
completely covered by the shield.  
INSTALL THE AUTOMATIC  
HUMIDISTAT CONTROL  
NOTE: Outdoor temperature sensor wire must not  
exceed 30 feet in length.  
For additional humidistat installation instruction, refer to  
the manual “Wiring Instructions for High-Capacity Steam  
Humidifiers.”  
CAUTION  
Do not run outdoor temperature sensor wire  
alongside wires carrying high voltage (120  
VAC or higher). Do not run the sensor wire  
through conduit.  
WARNING  
Electrocution Hazard. Disconnect electrical  
power to the furnace before beginning  
installation.  
7. Attach the Sensor Wire to the humidistat. Strip the  
connecting wire 1/4 inch and attach the two internal  
wires to the terminals labeled “Outdoor Tempera-  
ture Sensor” on the humidistat.  
Sharp edges. Use caution when cutting plenum  
openings and handling ductwork  
8. Select a power source. The voltage to the humidis-  
tat must be between 22-30 VAC.  
CAUTION  
NOTE: The compensating humidistat will operate prop-  
erly only with a continuous power source. A min-  
imum 10 volt amperes is required.  
Do not mount the compensating humidistat on  
the supply duct or plenum. The unit will not  
withstand supply temperatures.  
Do not set the humidity so high that condensation  
forms on windows or walls.  
9. Connect the humidistat to the humidifier. Strip the  
wires used for all the humidistat terminal connec-  
tions 1/4 inch.  
10. Set the humidistat. Consult the compensating humi-  
distat homeowner's manual for proper humidity set-  
tings.  
SELECT LOCATION AND MOUNT  
1. Check contents of the humidistat carton. Compo-  
nents include:  
Automatic humidistat  
69-1108—2  
4
 
HE420A STEAM POWER HUMIDIFIER  
Table 1. Humidity Settings.  
Outdoor Temperature °F  
Installing the Humidistat to Operate  
Manually  
Dial  
Position  
1. Locate the three-pin arrangement marked AUTO/  
MAN protruding from the control board (right of wir-  
ing connections).  
-10  
0
10  
20  
30  
40  
4
5
6
7
15% 20% 25% 30% 35% 40%  
20% 25% 30% 35% 40% 45%  
25% 30% 35% 40% 45% 45%  
30% 35% 40% 45% 45% 45%  
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).  
Manual Operation  
CAUTION  
Do not attach sensor wire to the blue wiring  
connection block.  
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).  
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.  
HUMIDISTAT OPERATING  
INSTRUCTIONS  
Table 2. Recommended Relative Humidity.  
Outside Temperature  
Recommended RH  
+40°F  
+30°F  
+20°F  
+10°F  
0°F  
45%  
40%  
35%  
30%  
25%  
20%  
15%  
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.  
-10°F  
-20°F  
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.  
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.  
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.  
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  
Remember that in AUTO mode, the dial is not showing  
relative humidity, but your preferred humidity setting  
based on Table 1.  
IMPORTANT  
If conditions exceed 50°F or 45 percent relative  
humidity, it may be necessary to perform this  
test.  
Table 1. Humidity Settings.  
Outdoor Temperature °F  
Dial  
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.  
Position  
-10  
0
10  
20  
30  
40  
1
2
3
10% 10% 10% 15% 20% 25%  
10% 10% 15% 20% 25% 30%  
10% 15% 20% 25% 30% 35%  
5
69-1108—2  
 
     
HE420A STEAM POWER HUMIDIFIER  
a. If set up correctly, the humidifier will begin oper-  
ating. In “Test” mode, the humidistat will operate  
for approximately one minute.  
b. If the humidifier does not activate properly in  
Test” mode, refer to Appendix A.  
CHECK THE HUMIDIFIER  
OPERATION  
After installation is complete, use the following steps to  
check the humidifier operation:  
4. Set the humidistat. Refer to Humidistat Operating  
Instructions for detailed instruction on initial settings.  
a. If home is occupied, set the knob to “5”, or for  
manual operation, set the knob to 35%.  
b. If home is vacant, turn the knob to counterclock-  
wise to “Off.”  
1. Turn on the humidifier water supply.  
2. Be sure the humidifier has power and then plug in  
the humidifier.  
3. Turn the Humidity Control to the Test position.  
NOTE: If relative humidity is above 45% in the home, or  
the outdoor temperature is above 50°F, a jumper  
may need to be placed across the humidistat’s  
OUT terminals to perform this checkout.  
INSTALL THE SAFETY CONTROL  
SHUTOFF  
Refer to the manual “Wiring Instructions for High-Capacity  
Steam Humidifiers” (page 11) for complete instruction on  
installing the Safety Control Shutoff.  
4. Check that the furnace blower comes on to circulate  
the moist air. The blower may take as long as fifteen  
minutes to start.  
5. Refer to the Humidity Control owner’s manual for  
operation.  
69-1108—2  
6
 
HE420A STEAM POWER HUMIDIFIER  
APPENDIX A  
Table 3. Compensating Humidistat Troubleshooting Guide.  
PROBLEM  
SOLUTION  
NOTES  
Humidifier does not  
operate in “Test”  
mode.  
Confirm the outdoor temperature sensor is  
connected to the correct terminals on the  
humidistat. (For manual operation, ensure the  
jumper pins are positioned correctly.)  
Check wiring diagram (Figure 1) for correct  
installation.  
Check the voltage at the humidistat “24 VAC”  
terminals. (Should be 22-30 VAC.)  
Ensure the control knob has not been left in the  
Test” position.  
Humidifier only  
operates in “Test”  
mode.  
Check the resistance of the sensor by removing  
the leads from the humidistat terminals and  
measuring the resistance across the wires with 90°F  
an ohmmeter. Compare the reading to the  
temperature/resistance chart (right).  
For automatic applications, make sure the  
outdoor temperature sensor is mounted  
completely outside the house (i.e. not recessed 40°F  
into the hole) on the North, Northeast or 30°F  
Northwest side, away from direct sunlight. And is 20°F  
mounted at least 3 feet away from all exhaust  
vents.  
If the outdoor temperature sensor is mounted in -10°F  
the fresh air intake duct, make sure the probe is -20°F  
no further than 30 inches from an outside wall.  
Temp/Resistance Chart  
100°F  
6000 ohms  
7500 ohms  
9500 ohms  
38°C  
32°C  
27°C  
21°C  
16°C  
10°C  
4°C  
80°F  
70°F  
60°F  
50°F  
11,500 ohms  
14,000 ohms  
18,000 ohms  
23,000 ohms  
28,500 ohms  
37,000 ohms  
46,500 ohms  
61,500 ohms  
78,500 ohms  
105,500 ohms  
135,000 ohms  
-1°C  
-7°C  
10°F  
0°F  
-12°C  
-18°C  
-23°C  
-29°C  
-34°C  
-30°F  
Notes:  
In automatic applications, if the outdoor  
temperature is greater than +50°F (+10°C)  
or less than -32°F (-35.6°C), the  
compensating humidistat will not operate  
(except in “Test” mode).  
In both automatic and manual applications,  
if the relative humidity in the home is  
higher than the knob setting, the  
humidistat will not operate. Similarly, the  
humidistat will not operate if the indoor RH  
exceeds 45%.  
Humidifier operates  
constantly.  
Check the humidistat setting. If the RH in the  
home is less than the knob setting, the humidifier  
will operate until the humidity level is higher than  
the knob setting.  
In “Test” mode, verify that the humidifier will shut  
off after approximately one minute.  
Check the resistance of the sensor.  
See previous Problem/Solution, regarding  
outdoor temperature sensor mounting locations.  
Turn the humidistat “OFF” and observe whether  
the humidifier turns off. If operation continues,  
check Figure 1 wiring diagram. Remove the  
wires from the humidistat's “OUT” terminals. If  
humidifier continues to operate, check the  
humidifier.  
Humidifier or  
Use a voltmeter to check for steady 22-30 VAC.  
Make sure the outdoor temperature sensor  
wiring does not run alongside the wires carrying  
high voltage (120 VAC or higher).  
compensating  
humidistat “chatters”  
or clicks on and off  
rapidly.  
Furnace or heat  
pump blower system  
runs continuously;  
condensation is  
building up in  
It may be necessary to make a setting change on  
the furnace or heat pump board to prevent the  
blower from shifting down to lowest idling speed.  
Consult the furnace/heat pump operating manual  
or contact the manufacturer for procedures to  
prevent low air flow.  
ductwork.  
7
69-1108—2  
 
HE420A STEAM POWER HUMIDIFIER  
APPENDIX B  
Table 4. Safety Control Relay (SCR) Operation and Troubleshooting Guide.  
Condition Cause Action Required  
SCR LED shows rapid series of red, Condition Normal. SCR processor is No action required.  
green, and yellow lights, followed by powering up and checking internal  
no LED display.  
operation.  
Humidifier won't operate. No SCR  
LED display.  
Problem! SCR circuit is not closing or Check SCR power; check humidistat  
humidistat is not calling for humidity.  
operation. If humidity is about 45% or  
outdoor temperature is above 50°F,  
the humidifier won't operate unless the  
humidistat is set to Test mode.  
Humidifier operates. SCR LED shows Condition Normal. This is a test phase. No action required.  
continuous yellow.  
SCR will wait 30 minutes to detect  
furnace blower operation. If the  
furnace blower is detected, the system  
will function properly.  
Humidifier won't operate. SCR LED  
shows continuous red.  
Problem! During the 30 minute test  
phase, the SCR failed to detect the  
furnace blower and turned the  
humidifier off.  
Turn the humidistat off, then on again,  
to reset the system. Although unlikely  
to occur, this failure/reset process can  
occur twice before further action is  
necessary.  
Humidifier operates. SCR LED shows Condition Normal. All systems  
No action required.  
continuous green.  
(furnace, humidistat, humidifier and  
SCR) are operating properly.  
Humidifier won't operate. SCR LED  
shows flashing red.  
Problem! The SCR failed to detect the Contact your HVAC contractor ASAP  
furnace blower for the third time and, to check out and repair the system.*  
as a safety precaution, has locked out  
the humidifier. This is an indication  
that some aspect of the system  
(furnace, humidistat, humidifier or  
SCR) has malfunctioned.  
* Before the SCR can be reset, the system must be checked and repaired by a licensed contractor. To reset the SCR,  
insert a rigid, small-diameter object (e.g. paperclip) into the smallest hole in the face of the SCR, next to the green  
connector block. This, too, should be performed by an HVAC contractor.  
Automation and Control Solutions  
Honeywell International Inc.  
1985 Douglas Drive North  
Golden Valley, MN 55422  
customer.honeywell.com  
Honeywell Limited-Honeywell Limitée  
35 Dynamic Drive  
Scarborough, Ontario M1V 4Z9  
® U.S. Registered Trademark  
© 2006 Honeywell International Inc.  
69-1108—2 M.S. Rev. 04-06  
 

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