Honeywell HE360 Installation Instructions

HE360 Humidifier and
Installation Kit

INSTALLATION INSTRUCTIONS

WELCOME

Required Accessories (Included)

To the comfortable world of humidified air. When you use
your Honeywell humidifier, notice that your skin is not as
dry, and that your scratchy throat and irritated nasal
passages that aggravate allergies and asthma are
steadily improving.

You have also taken the first step in reducing the zapping
you create when you walk on your carpet and then touch
your TV, computer, metal door knob or your pet. Your
furniture and woodwork are also benefitting from the
difference that humidified air makes.

Congratulations! You have just made a great investment
in improving the comfort of your home.

APPLICATION

This kit contains your new Honeywell HE360 Humidifier,
H8908 Humidistat and all the accessories required for
installation.

INSTALLATION

Preparing for the Installation

Be sure to identify all the required (Table 1) accessories
(included) and make sure the appropriate tools are
available before beginning the installation.

Required Tools

Table 1. Required Accessories.

Quantity Accessory (Item Quantity)

Humidifier Parts and Accessories

20 ft

(6.2m)

(6.2m)

(3.1m)

1 bag Connecting and mounting hardware:

1 bag Saddle Valve Assembly:

18 gauge, two-strand thermostat wire

20 ft

1/4 in. (6.35 mm) OD feed water tubing

10 ft

1/2 in (12.7 mm) ID drain tubing

Wire nuts (4)
No. 8 sheet metal screws (18)
Drain tube clamp
Feed tube mounting clamps (6)
Brass inserts (2)
Plastic compression rings (2)

1 H8908 Humidistat

Saddle valve and top clamp (1)
Threaded bottom clamp (1)
Bolts (2)
Rubber gasket (1)
Brass insert (1)
Plastic bushing (1)

69-2517EF-01

HE360 HUMIDIFIER AND INSTALLATION KIT

CAUTION

M12808B

HORIZONTAL

DOWN

FLO

LOW

BOY

RETURN

RETURN

HIGHBOY

RETURN

Table 1. Required Accessories.

Quantity Accessory (Item Quantity)

Air Pressure Switch and Accessories

2 Black rubber gasket

2 Tubing Fitting Elbow

10 ft

(3.1m)

Tubing, 1/4 in. ID

1 Differential Pressure Switch

2 Screws, #8 x 3/4 in. sheet metal

2 Terminal Adaptor

Tools required for installation include:

• Tin snip.

• Screwdriver.

• Adjustable or open-end wrench.

• Drill, punch or awl.

•Level.

• 3/4-in. Sheet Metal Drill Bit

Determining Best Location for
Humidifier

M27302

M27323

— Mount the humidifier in a conditioned space to

prevent freezing.

Fig. 1. Typical humidifier installation locations.

Selecting Water Supply Location

• Use either hard or soft water in the humidifier and
either hot or cold water. The water flow rate, with the
humidifier running, is 3.5 gal/hr (13 liters/hr) to flush
the pad and provide moisture for evaporation.

• Make sure that the 20 ft (6.2m) of feed water tubing
provided is adequate to connect the water supply
(saddle valve) with the humidifier solenoid valve.

Temperature and Static Pressure Hazard.
Can cause property or equipment damage.

Locate humidifier where ambient temperature is
between 32°F (0°C) and 160°F (71°C).
Do not install humidifier where freezing
temperatures could occur.
Be sure supply plenum static pressure is no
greater than 0.4 in. wc and water pressure is no
greater than 124 psi.

• Select a location for the humidifier on the supply (warm
air stream) plenum. See Fig. 1.

• Select a location that cannot damage the air
conditioner A-coil during installation.

• Do not locate the humidifier on the furnace body.

• Allow adequate clearance in front of and above the
humidifier so you can easily remove the cover to
perform routine maintenance.
— Mount the humidifier at least 3 in. (78 mm) above

the furnace body to allow adequate space for the
solenoid valve and drain line.

69-2517EF—01 2

Locating Closest Floor Drain

• Select location with access to a floor drain to provide
drainage for air conditioner condensation and
humidifier drainage.

• If you do not have a drain available, we recommend
that you install the Honeywell Whole House Drum or
Disk Humidifier. Make sure that the 10 ft (3.1m) of
drain tubing is adequate to reach from the humidifier
drain connection to the floor drain.

Selecting Location for Humidistat

• Select a location for the humidistat on the return
plenum or on the wall in the living space.
— Mounting on the return plenum is the easiest

installation for the control wiring circuit.
For return duct mounting, the humidistat should be
mounted upstream from the humidifier or bypass so that it
is properly sensing the relative humidity of the living
space. Locate the control at least 8 in. (203 mm)
upstream from the humidifier in the return air duct. (See
Fig 2.)

WARNING

CAUTION

RETURN

M12809

COVER
ASSEMBLY

HUMIDIFIER
PAD ASSEMBLY

FEED TUBE NOZZLE

WATER
DISTRIBUTION TRAY

HUMIDIFIER
HOUSING

THUMB
SCREW

M12813

CLIP

CLIP

AIR

6 in. (152 mm)
MINIMUM

BEST
LOCATION

ALTERNATE LOCATION

15 in. (381 mm)
MINIMUM

RETURN
AIR

HE360 HUMIDIFIER AND INSTALLATION KIT

4. Tape the template in position and trace around
the template.

5. Remove the template and carefully cut the rect­angular opening.

6. Disassemble the humidifier; remove the cover and

take out the humidifier pad assembly. See Fig. 3.

RETURN AIR DUCT

M12831A

Fig. 2. Selecting duct location for humidistat.

Locating Closest 120V Electrical Outlet

• Select location with access to an outlet. If not
available, contact an electrician to have one installed.

• Make sure that the humidifier cord is adequate to
reach from the humidifier to the outlet.

• Make sure that the 20 ft (6.2m) of thermostat wire is
adequate to reach from the humidifier solenoid, to the
sail switch, to the humidistat.

Installing the Humidifier

Hazardous Voltage
Can cause personal injury or equipment
damage.

Do not cut or drill into any air conditioning or
electrical accessory.

Sharp Edges Installation Hazard.
Can cause personal injury.

Wear gloves and safety glasses.

1. Turn off power to the air handing system at the cir-

cuit breaker.

2. Draw a level line on the plenum in the location

chosen for the humidifier. (Leveling assures optimal
humidifier performance.)

3. Locate the template (form number 69-1651
included in the box).

Fig. 3. Disassembling humidifier.

7. Position the securing clips as shown in Fig. 4.

Fig. 4. Position securing clips.

8. Make sure the humidifier housing is level, then posi-

tion it in the opening so the plastic tabs are in place
on the lower sheet metal edge of the opening. Use
pliers, as necessary, to flatten cut edges. See Fig.

5.

9. Push in securing clips until completely seated.

10. Drill holes and install the three sheet metal screws

on the top of the humidifier housing. Secure the
housing with the three remaining screws.

3 69-2517EF—01

HE360 HUMIDIFIER AND INSTALLATION KIT

CAUTION

DUCT

LEVEL

SHEET METAL
SCREWS (4)

PLASTIC
TABS (2)

DRAIN TUBING

M20204

OPENING

TO AIR DUCT

M20176

BRASS COMPRESSION NUT

PLASTIC
COMPRESSION RING

BRASS INSERT

M20177

Fig. 5. Installing humidifier on duct.

11. Reinstall the humidifier pad assembly in the humidi-

fier housing.

IMPORTANT

Be sure to reconnect the water feed tube and
ensure that the tube is not pinched or kinked.

12. Hinge the cover in place and secure with the thumb-

screw located at the bottom of the cover.

NOTE: The saddle valve is not designed to regulate

water flow. The valve is either open or closed.

IMPORTANT

To prevent debris from clogging the solenoid in­line filter, be sure to install the saddle valve han­dle pointing toward the ceiling.

Fig. 6. Installing feed tubing.

4. Use 1/4-in. (6mm) OD tubing and connect the sad-

dle valve to the inlet side of the solenoid valve on
the humidifier (See Fig. 9).

5. Repeat step 2, a - d for saddle valve fitting.

NOTE: Cut tubing to correct length so the tubing termi-

nates at the drain.

Connecting the Plumbing

1. Shut off the water.

Chemical Hazard.
Can cause personal injury or equipment
damage.

Do not use any line connected to an air
conditioner.
Do not use gas line.

2. First, connect 1/4-in. line to the humidifier’s sole­noid valve, located at the bottom of the humidifier.
a. Remove the compression nut.
b. Discard the brass ring, replacing it with the plas-

c. Install the brass insert into the end of the tubing.
d. Insert the tubing into the solenoid valve fitting

NOTE: Do not over-tighten the compression nut. Moder-

ate tightness prevents leaking.

3. Use the saddle valve (included) to tap into the water
supply line at the location selected. See Fig. 8. If
tapping into galvanized pipe, drain line and pre-drill
3/17-in. tap for saddle valve.

69-2517EF—01 4

tic ring.

and support the valve while tightening the com­pression nut.

Fig. 7. Installing the drain tubing.

Air Pressure Switch Installation

IMPORTANT

Do not install the switch in an area where tem­perature exceeds rating of -40F to 190F (-40C to
88C)

1. Disconnect power from the humidifier before install-

ing.

2. Mount the switch vertically with pressure connec-

tors facing down, using provided self-tapping
screws to secure the switch to the duct.

HE360 HUMIDIFIER AND INSTALLATION KIT

IMPORTANT

Calibration accuracy requires that the switch be
mounted vertically (as pictured in Fig. 8).

Fig. 8. Pressure switch—oriented vertically.

3. The return duct is recommended, however the

switch can also be mounted to the supply duct.

A

M27300

4. Cut a 3/4-in. diameter hole in the duct within 10 feet

of the switch to ensure the provided tubing reaches
the pressure tap elbow.

5. Insert the black rubber gasket into the duct hole.

6. Connect the tubing to the tubing fitting elbow and

insert the tubing fitting elbow into the black rubber
gasket.

7. Connect the other end of the tubing to the applica-

ble pressure connection on the switch.
e. Black connection if installed on the supply
f. Grey connection if installed on the return
g. Both grey and black if installed on both

IMPORTANT

With low-speed airflow or variable speed sys­tems it is recommended to run tubing to both the
supply and return ducts.

INSIDE

OF DUCT

1

1

CONNECT TUBING TO + CONNECTION IF PRESSURE TAP IS
MOUNTED TO SUPPLY DUCT. CONNECT TO – IF PRESSURE
TAP IS MOUNTED TO RETURN DUCT.

M27304

Fig. 10. Install tubing.

8. You may cut the tubing to fit the connection length

between the tubing fitting elbow and switch. It is
also recommended to secure the hose to existing
structures to avoid accidental disconnection.

B

SUPPLY DUCT INSTALL - AIR LINE ONLY TO TAP A,

CONNECTED TO THE + PORT ON THE AIR FLOW SWITCH
RETURN DUCT INSTALL - AIR LINE ONLY TO TAP B,

CONNECTED TO THE – PORT ON THE AIR FLOW SWITCH
SUPPLY/RETURN DUCT INSTALL - AIR LINE CONNECTED

TO BOTH THE + AND – PORTS ON THE AIR FLOW SWITCH

M27303

Fig. 9. Mounting the pressure switch.

Installing the Humidistat

Installing on Mounting Duct

1. Apply the template to the duct location chosen
for the humidistat. Make sure the template is
level before drilling the holes.

2. Refer to the template (provided with the H8908
Humidistat Installation Instructions) to drill the
control assembly opening and mounting holes
for the H8908.

3. Remove the H8908 case from the base.

4. Position the foam gasket on the H8908 base.

5. Position the base on the duct with the arrow up.

6. Secure the base to the duct using the four

1 in. (25 mm) mounting screws provided with humi­distat.

7. Connect the low-voltage wires to the leads and
replace the H8908 case. See Fig. 12.

NOTE: For wall mounting instructions, see the H8908

Installation Instructions.

5 69-2517EF—01

HE360 HUMIDIFIER AND INSTALLATION KIT

CAUTION

M20179

WIRE SLOT

HUMIDISTAT WIRES

HUMIDISTAT BASE REAR OF HUMIDISTAT

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M28969

BLACK

WHITE

HUMIDIFIER

SOLENOID

VALVE

HUMIDISTAT

AIR PRESSURE

SWITCH

ATTAC H

ADAPTOR

WIRE TO HVAC

C TERMINAL

M27398A

COMMON (C) TERMINAL

1/4 (6) X 1/32 (1) THICK

QUICK CONNECT

NORMALLY OPEN (NO)

TERMINAL 1/4 (6) X 1/32 (1)

THICK QUICK CONNECT

ATTACHADAPTER

WIRE TO HUMIDIFIER

C TERMINAL

C

1

2

3

1

2

3

2

3

NC

NO

+

PI

ASSEMBLED

IN MEXICO

Fig. 11. Humidistat base and rear view.

WIRING

Hazardous Voltage.
Can cause personal injury or equipment
damage.

Disconnect power supply before installing or
servicing equipment.

IMPORTANT

All wiring must comply with applicable local
code, ordinances and regulations.

Wire the humidifier solenoid valve, pressure switch,
humidistat and transformer.See Fig. 13.

Fig. 13. Close-up of pressure switch wiring.

1. Run the two-strand thermostat wire from the humid-

ifier to the humidistat, and from the humidistat to the
pressure switch and back to complete the wiring
loop to the humidifier. This is illustrated in Fig. 12.

2. Cut lengths of thermostat wire to reach between

components, leaving adequate wire at both ends for
connections.

NOTE: Humidistat and pressure switch can be wired in

any order.

3. At the humidifier, connect the black and white con-

ductors to the two yellow humidifier wires. (The red
wires from the humidifier are not used.)

4. At the humidistat, connect both black conductors to

the two humidistat terminals. Use a wire nut to con­nect together the two white conductors.

TESTING HUMIDIFIER OPERATION

Fig. 12. Wiring the controls.

69-2517EF—01 6

Checklist

 Humidifier is level.
 Control wiring was reviewed using circuit diagram.
 Humidifier is plugged in.
 Feed line has no kinks.
 Drain line slopes continuously down and ends at floor

drain.

 Water hose inside humidifier is connected to

PerfectFlow™ water distribution tray.

After installation use the following steps to check the
humidifier operation:

1. Turn on the power and the water supply

2. Turn the H8908 Humidistat to On and turn on the

heat by setting the thermostat to 10ºF (6ºC) above
room temperature.

IMPORTANT

The furnace blower must be on to activate the
humidifier.

3. Make sure that water is flowing out of the drain

hose. If water does not flow, see Troubleshooting
Your Humidifier section.

4. Check for leaks.

5. Reset the thermostat and H8908 Humidistat to a

comfortable setting for automatic operation.