DH90 Whole House Dehumidifier
with fresh air ventilation
Installation Guide
Dehumidification
Fresh Air Ventilation
Compact Size
Energy Efficient
The DH90 whole house dehumidifier integrates
high-capacity dehumidification, fresh air ventila-
tion, and filtration, into a compact and easy to
install enclosure.
Fresh Air Ventilation (optional)
An automatic ventilation controller and dehumidi-
stat are included.
Fresh air may be ducted to the unit and regulated
using the provided Honeywell W8150 fresh air
ventilation controller along with the optional
EARD6 damper.
The dehumidifier removes 90 pints of water from
the air per day (80F, 60% RH) while only using 6.2
Amps of electricity.
The high moisture removal capacity helps main-
tain proper levels of humidity in most homes.
Dehumidification
The DH90's high efficiency refrigeration system is
further enhanced with a heat exchanger to achieve
exceptional performance while keeping your energy
costs as low as possible.
HVAC Installer: Please leave manual for homeowner.
® U.S. Registered Trademark.
Copyright © 2006 Honeywell International Inc.
All rights reserved.
69-1951
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For HVAC Installer Only • Installation Guide
4.1A Power Accessibility
1. Intended Application for DH90
Unit should be located in an area where the cord’s
length (10') should easily reach a 115 VAC electrical
outlet with a minimum of a 15 A circuit capacity.
The DH90 is intended for use in residential
applications to reduce the indoor humidity levels
and increase comfort. With the optional ventilation
ducting and ventilation control hookup, the device
also provides precise amounts of ventilation air.
4.1B Accessibility
The installed DH90 should have at least 14 inches
of clearance in the front of the device to service
the filter.
2. Approvals
The DH90 is certified by ETL to meet UL 474 and
CSA 22.2 No. 92.
4.1C Support Structure and Suspension
Place the DH90 on supports to raise the base of the
unit. Do not place the DH90 directly on structural
building members without vibration absorbers or
unwanted noise may result.
3. Specifications
Model: DH90
Electrical: 110-120 VAC, 6.2 Amps,
60 Hz, grounded
The DH90 may be suspended from structural
members by supporting the entire base of the unit
via cross members, rigid frame, or the like. Do not
hang the a DH90 from the cabinet. Remember to
place a drain pan under the unit if it is suspended
above a finished area or above an area where
water leakage could cause damage.
Capacity: 90 pints/day @ 80°F, 60%
RH
Inlet air temperature range: 55°F min., 100°F max.
Air Flow: 200CFMwithoutexternal
ducting
4.1D Sizing Chart
Refrigerant Charge: 1 lb., 12 oz. R22
*This sizing chart is based on extreme climates where Rh levels
are between 70 and 90% outdoor Rh. For less extreme climates
then larger homes can be adequetely served. Actual requirements
Duct Connections: Round 10" inlet, 10"
outlet, 6" ventilation
inlet
may vary.
Filter Size: Pleated MERV 11:
14" x 14" x 1"
Dehumidifier Capacity Required to
Maintain Desired Indoor Rh*
Unit Size (w/o Duct Collars): 34.5"L x 15.75"W
x 20.875"H
60% Indoor 55% Indoor 50% Indoor
Home Size
Rh
Rh
Rh
(square
feet)
Unit Weight: 92 lbs
Pints/day
49-54
Pints/day
55-58
Pints/day
71-78
Shipping Weight: 99 lbs
2080
2600
3120
61-68
75-82
65-72
79-86
90-97
4. Installation
95-110
4.1 Installation Checklist
4.2 Electrical Requirements
ImPORTANT: Prior to installation of the
DH90, the following checklist should be
reviewed.
WARNINg: Installation must be performed
by a qualified service technician and must
comply with local codes. Remove power to
the device before installing or servicing the
device. Failure to connect the device
The DH90 can be installed in a variety of locations
to meet the owner’s needs, and integrate with
existing forced air systems or existing ductwork
if desired. Choose a location with consideration
to accessibility for service, drain availability, and
power outlet location.
according to these instructions may result in
damage to the device or the controls.
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DH90 Dehumidifier • For HVAC Installer Only
The DH90 plugs into a common grounded 115VAC
outlet. The device draws 6.2 Amps under normal
operating conditions. If used in an area which
may become wet, a ground fault interrupter (GFI)
protected circuit is recommended.
4.4 Ducting
ImPORTANT: When connecting ventilation
duct, remove the label and 6" round
insulation plug from the ventilation duct
opening. If not using ventilation feature,
leave the insulation intact.
ImPORTANT: Do not install the humidistat
where it may not accurately sense the relative
humidity such as near HVAC supply registers,
near exterior doors, on an outside wall, near a
window, or near a water source.
For the ideal installation, draw air from the central
part of the home and return it to the isolated areas
of the home like the bedrooms, den, utility room,
or family room. See Fig. 1. Alternative installation
option can be completed by drawing air directly
from the return ducting and distributing through
the supply air to the home.
Refer to Section 6 for typical hookup diagrams.
Some of the control wires leaving the DH90 may
not be used with certain installations and should
be left unconnected with wire nuts taped onto the
stripped ends for safety.
4.4A Fresh Air / Supply Air
4.3 Condensate (Water) Removal
ImPORTANT: DO NOT draw air directly from
the kitchen, laundry, or isolated basement.
The DH90 removes a large amount of moisture
from the air and the device must be connected to
a drain line that will carry away the excess water. A
trap in the drain line is recommended and may be
required by some local codes.
Air may be drawn from a basement that is open
to the home. All flexible ducting connected to the
DH90 should be UL listed.
A short piece of flexible ducting on all DH90 duct
connections is recommended to reduce noise
and vibration transmitted to rigid ductwork in the
structure. Ducting the DH90 as mentioned requires
consideration of the following points:
The drain line should be connected to the 3/4" male
pipe thread adaptor on the front of the DH90.
Care should be taken to install the drain line with
a continuous slope of 1" per 10' to assure proper
water removal.
•
Duct Sizing: For total duct lengths up to
25', use a minimum 10" diameter round or
Figure 1: Ducting to isolated areas.
W8150
Controller
Fresh air intake
EARD6
Supply air
Motorized
damper
Ducting to isolated areas
Indoor air
return
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equivalent rectangular. For longer lengths,
use a minimum 12" diameter or equivalent.
Grills or diffusers on the duct ends must
not excessively restrict airflow.
structure. This helps prevent dirty and
humid air from entering elsewhere.
Exhaust fans are recommended in the
bathrooms and kitchen.
•
Isolated Areas: Effective dehumidification
may require that ducting be branched to
isolated, stagnant air flow areas.
An insulated 6" diameter duct is generally
sufficient to provide up to 75 CFM of outside air.
Large quantities of outside air will impact DH90
performance positively or negatively, depending
upon the inside and outside air conditions.
Use 8" or larger diameter branch ducting to each
of two or three areas, use 6" or larger to each of
four or more areas. Provisions must be made to
provide airflow from supply locations to central
return location. Proper air distribution is important
to ensure even humidity control throughout the
structure.
The outside air duct should be connected to the 6"
round collar on the side of the unit. The amount of
outside air can be restricted by the blade damper
in the 6" collar. The actual amount of ventilation
air being delivered through the ventilation ducts
must be measured in each installation. Refer to the
instructions provided with the W8150 Ventilation
Control for proper setup instructions.
4.4B Ducting for Fresh Air — Option
Fresh air may be brought into the structure by
connecting an insulated duct from outside the
structure to the 6" inlet of the DH90. Advantages
of this form of ventilation include:
4.4C Installation in a Basement or Crawl Space
with an Existing Forced Air HVAC System
1. Outside air is filtered before entering the
building.
Install a separate 10" return for the DH90 in a central
area of the structure. Optional: Duct the supply of
the DH90 to a 10" x 10" x 10" tee/damper, adjusted
to 20% open to the basement. Duct the other side
of the tee to the air supply of the existing HVAC
system with a backdraft damper. Connect a duct
from outside to the 6" collar of the DH90 if you
wish to provide ventilation air. See Figure 2.
2. Outside air will be dehumidified before
entering if the DH90 is running in
dehumidification mode.
3. Drawing air from outside and blowing
inside aids in slightly pressurizing the
Figure 2: Basement or crawlspace installation.
Indoor
Heating A/C
air return
W8150 Controller
return air
Heating A/C supply air
Dry air to basement
Fresh air
EARD6
Inlet hood
motorized
damper
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DH90 Dehumidifier • For HVAC Installer Only
W8150
Controller
EARD6
Motorized
damper
Heating & A/C unit
Fresh air intake
Supply air
Indoor air
return
Indoor air
supply
Indoor air
return
Figure 3: Attic Installation.
Instead of installing a separate return to the DH90,
and if the existing system has multiple returns,
it is possible to select one to disconnect from
the existing forced air system and use it for the
dedicated DH90 return. Always select a return from
a central location in the structure in an area that is
always open to the rest of the structure. Do not use
a return from a room that may have its door closed
much of the time.
The preferred method of installation is to create a
separate return for the DH90 in a central area of
the structure. Duct the supply of the DH90 to the
air supply of the existing HVAC system. Connect
an insulated duct from outside to the 6" collar of
the DH90 if you wish to provide fresh air. Adjust a
damper in the duct to provide the desired amount
of fresh air. See Figure 3.
4.4E Installation in a Structure with No Existing
Forced Air HVAC System
4.4D Installation in an Attic with an Existing
Forced Air HVAC System
When installing the DH90 in a structure that does
not have a forced air HVAC system, a single return
for the DH90 should be installed in central open
area of the structure.
ImPORTANT: ALWAYS install a catch pan
with a drain or float interrupt for condensate
under the DH90 in an attic or condensate
may damage the living space below.
DO NOT locate the return in a bathroom or a
kitchen. The supplies of the DH90 should be
located in the remote areas of the structure (such
as bedrooms, den, etc.). By ducting this way, the
air inside the structure will circulate through the
DH90 to be filtered and dehumidified.
The interrupt switch should be installed in series
with the field wire that connects the blue lead
from the DH90 to the dehumidistat. If overflow
occurs, this switch opens the compressor control
circuit and stops water production before the
catch pan overflows. The DH90 will continue to
ventilate or circulate air as normal, but will not
dehumidify until this switch closes.
6" diameter duct is recommended for branches to
the bedrooms, 8" diameter duct is recommended
for branches to larger areas. Connect an insulated
duct from outside to the 6" collar of the DH90 if
you wish to provide ventilation. See Figure 4.
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For HVAC Installer Only • Installation Guide
W8150
6. Wiring Diagrams
Controller
EARD6
Motorized
damper
DH90
Exhaust
Air
White
Red
Yellow
Blue
Green
Fresh air
Inlet hood
Indoor air
return
Figure 4: Install with no forced air HVAC system.
24VAC for powered
Humidistat
4.5 Noise Abatement
OUTDOO
R
HUMIDITY
SETTING
15%
TEMPERA
TURE
-30
-20
-10
F
F
C
-25
C
20%
Humid
ity Co
d'humi
0
F
F
-20
-10
-5
C
C
ntrol
25%
+10
+20
F
30%
Régu
F
lateur
C
dité
Ove
r
35%
20
Over
0
C
40%
A length of 10' or more of acoustical flex ducting
on the outlet of the DH90 will reduce air noise from
the fan. A length of flexible ducting on all DH90
duct connections is recommended to reduce noise
transmitted to rigid ductwork in the structure.
Dehumidistat
Figure 5: Dehumidistat only—No fresh air ventilation.
5. maintenance
Figure 6: Dehumidistat including fresh air ventilation.
5.1 Air Filter
Ventilation damper
The DH90 is equipped with a MERV 11 media
filter. This filter should be checked every three
months and replaced every six months. Operating
the unit with a dirty filter will reduce dehumidifier
capacity and efficiency and may cause the com-
pressor to cycle off and on unnecessarily on the
defrost control.
XFMR
R
W8150A
C
CAUTION: Operate the unit only with a
genuine Honeywell filter installed to assure
proper performance of the unit.
Damper
DH90
5.2 Optional Fresh Air Intake
White
Red
Yellow
Blue
Green
Check and clean the screen on the outdoor fresh
air intake port seasonally. The screen may become
plugged during the seasons when there are many
particles in the outdoor air.
Remote
24vac for
Powered
Outdoor
Humidity
emperatur
e
T
-20
Setting
15%
f
-30
-25
-20
-10
-5
c
c
-10
f
f
f
20%
Humid
Régula
0
ity con
c
c
trol
teur d'h
25%
+10
+20
over 20
30%
35%
f
umidit
c
c
é
f
over
0
40%
Humidistat
Ventilation
Override
Switch
Dehumidistat
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DH90 Dehumidifier • For HVAC Installer Only
6.1 Choose the correct wiring diagram based on HVAC system
HVAC
HVAC
R
C
W
Y
G
R
C
W1
W2
Y1
Y2
G
W8150A
W8150A
GF
RC
CC
CH
GF
RC
CC
CH
W
W
G
T
G
T
R
RC
W
Y
G
R
RC
C
W
1
W2
Y1
Y2
G
System
System
Heat
Heat
AM
AM
Fan
Fan
Tue
Wake
Room
Tue
Wake
Room
Auto
DST
Auto
DST
M19994
M19996
Figure 7: Single transformer, conventional system.
Figure 9: Multi-stage conventional system.
Figure 8: Dual transformer, conventional system.
Figure 10: Wiring heat pump without emergency heat.
HVAC
HVAC
HEATING
COOLING
R
C
Y
G
O
R
C
W
R
C
Y
G
W8150A
W8150A
GF
RC
CC
CH
G
R
C
C
F
C
C
H
W
W
G
T
G
T
R
R
C
W
Y
G
O/B
R
RC
W
Y
G
System
Heat
AM
System
Heat
Fan
AM
Tue
Wake
Room
Auto
DST
Fan
Tue
Wake
Room
Auto
DST
M19997A
M19995A
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HVAC
W2
TIPS:
•
Ventilation control reads new dial setting only
when test button is pushed or power is cycled.
R
C
Y
E
G
O
To ensure dial settings are read, push test
button after any changes are made.
W8150A
•
•
For single bedroom homes, set the bedrooms
dial to 2 (this may result in more ventilation than
the minimum required).
G
R
C
C
F
C
C
H
For homes having more than five bedrooms
and only a single ventilation system, set the
bedrooms dial to 5 (this may result in less
ventilation than the minimum required).
W
G
T
•
•
•
•
For conditioned square feet, set area (sq ft) dial
to the nearest value.
R
C
W
1
Y
1
W
2
E
G
O/B
System
Heat
For airflow, set airflow (cfm) dial to the nearest
value.
AM
Fan
Tue
Wake
Room
Auto
DST
Vaulted ceilings do not need to be considered
when setting this control.
M19998A
For homes with multiple systems: Honeywell
recommends a ventilation control and fresh
air intake for each system. Measure ventilation
airflow for each system independently. Refer to
Multi-system Setup Example for further details.
Figure 11: Wiring heat pump with emergency heat.
7. Parts List
For replacement parts call: 1-800-345-6770.
DH90A1007 — DH90 Dehumidifier
EARD6 — Motorized Damper
50018994-001 — 14" x 14" x 1" MERV 11 Filter
50018995-001 — 10" Back Draft Damper
W8150A 1001
Date installed:________________________
Ventilation Limit*
GF
RC
R
24 VAC
C
60%
1
2
100%
XFRM
ASHRAE 62.2
62-1999
HVAC CC
CH
DMP
DMP
AUX
AUX
REM
REM
Damper
Ventilation
Installer
Test
Standard
W
ERV/Fan
Stat GT
Timer/Switch
_________
bedrooms
_________
_________
airflow (cfm)
area (sq. ft.)
Record settings above
Honeywell
Para español ver las instrucciones
50001159-001 Rev.
A
or call 1-800-468-1502
*See Instructions Voir mode d'emploi en français inclus
8. Setting the control
1. Be sure power is turned on.
Date installed:________________________
Ventilation Limit*
W8150A 1001
2. Set the Ventilation Standard on the control.
3. Set the bedrooms dial.
GF
RC
R
24 VAC
XFRM
C
60%
1
2
100%
ASHRAE 62.2
62-1999
HVAC CC
CH
DMP
DMP
AUX
AUX
REM
REM
Damper
Ventilation
Installer
Test
Standard
W
ERV/Fan
Stat GT
4. Set the area (sq ft) dial.
Timer/Switch
_________
bedrooms
_________
_________
airflow (cfm)
area (sq. ft.)
Record settings above
5. Set the airflow (cfm) dial.
6. Press the test button and observe the lights:
green light is flashing.
The dial settings meet the chosen standard.
Red light is flashing.
There is not enough fresh air delivered
to meet the requirements of the selected
standard. See Troubleshooting section.
7. Record settings on the label inside the cover
as shown in the diagram.
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DH90 Dehumidifier • For HVAC Installer Only
9. Service
CAUTION: Servicing the DH90 with its high pressure refrigerant system and high voltage circuitry
presents a health hazard which could result in death, serious bodily injury, and/or property damage.
Service should only be performed by a qualified service technician.
9.1 Troubleshooting
4. Defective compressor.
5. Defrost thermostat open.
Nodehumidification,neitherfannorcompressor
run with fan switch and ventilation timer OFF.
6. Optional Condensate Pump Safety Switch
open.
1. Unit unplugged or no power to outlet.
2. Humidity control set too high or defective.
3. Loose connection in internal or control wiring.
4. Defective Compressor relay.
Fan runs when there is a call for dehumidifica-
tion and the ventilation control is OFF, but the
compressor cycles on and off too frequently.
1. Low ambient temperature and/or humidity
causing unit to cycle through defrost mode.
5. Defective control transformer.
6. Low pressure control open.
2. Defective compressor overload.
3. Defective compressor.
7. Optional Condensate Pump Safety Switch
open.
4. Defrost thermostat defective.
5. Dirty air filter(s) or airflow restricted.
No dehumidification, compressor does not run
but fan runs when there is a call for dehumidi-
fication and the ventilation control is OFF.
6. Low refrigerant charge, causing defrost
control to cycle.
1. Defective compressor run capacitor.
2. Bad connection in compressor circuit.
3. Defective compressor overload.
7. Bad connection in compressor circuit.
Fan does not run with fan switch in either
position.
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Fan does not run with ventilation activated.
Compressor runs briefly but cycles on & off
with humidity control turned to ON.
Unit Test to determine problem:
1. Detach field control wiring connections
from main unit.
1. Loose connection in fan circuit.
2. Obstruction prevents fan rotation.
3. Defective fan.
2. Connect the yellow and green pigtails
from the main unit together; only the
impeller fan should run. Disconnect the
wires.
4. Defective fan relay.
3. Connect the yellow and blue pigtails from
the main unit together; the compressor
and impeller fan should run.
5. Defective fan capacitor.
Evaporator coil frosted continuously, low de-
humidifying capacity.
4. If these tests work, the main unit is
working properly. You should check the
control panel and field control wiring for
problems next.
1. Defrost thermostat loose or defective.
2. Low refrigerant charge.
5. Remove the control panel from the
mounting box and detach it from the
field installed control wiring. Connect the
blue, yellow, and green wires from the
control panel directly to the corresponding
colored pigtails on the main unit.
Leave the violet, white, and red wires
disconnected!
3. Dirty air filter(s) or airflow restricted.
Unit not providing ventilation.
1. Check control wire connections (check
connections at fresh air damper also).
2. Defective fresh air damper.
3. Dirty air intake. Clean outside intake hood.
6. Turn on the fan switch; the impeller fan
should run. Turn off the fan switch.
Unit removes some water, but not as much as
expected.
7. Turn on the humidity control; the
compressor and impeller fan should run.
1. Air temperature and/or humidity have
dropped.
8. If these tests work, the problem is most
likely in the field control wiring.
2. Humidity meter and or thermometer used
are out of calibration.
9.2 Refrigerant Charging
3. Unit has entered defrost cycle.
4. Air filter dirty.
If the refrigerant charge is lost due to service or a
leak, a new charge must be accurately weighed in.
If any of the old charge is left in the system, it must
be recovered before weighing in the new charge.
Refer to the unit nameplate for the correct charge
weight and refrigerant type.
5. Defective defrost thermostat.
6. Low refrigerant charge.
7. Air leak such as loose cover or ducting
leaks.
9.3 Compressor/Capacitor Replacement
8. Defective compressor.
9. Restrictive ducting.
This compressor is equipped with a two terminal
external overload and a run capacitor, but no start
capacitor or relay.
10. Optional Condensate Pump Safety Switch
open.
CAUTION-ELECTRICAL SHOCK HAZARD:
Electrical power must be present to perform
some tests. These tests should be performed
by a qualified service person.
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DH90 Dehumidifier • For HVAC Installer Only
Warranty Information
Honeywell warrants this product, excluding battery, to be free from defects in the
workmanship or materials, under normal use and service, for a period of five (5)
years from the date of purchase by the consumer. If at any time during the war-
ranty period the product is determined to be defective or malfunctions, Honeywell
shall repair or replace it (at Honeywell's option).
THIS WARRANTY IS THE ONLY EXPRESS WARRANTY HONEYWELL MAKES ON THIS
PRODUCT.THE DURATION OF ANY IMPLIED WARRANTIES, INCLUDING THE WAR-
RANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, IS
HEREBY LIMITED TO THE FIVE-YEAR DURATION OF THIS WARRANTY. Some states
do not allow limitations on how long an implied warranty lasts, so the above limita-
tion may not apply to you.
If the product is defective, Contact your installing contractor for return information.
This warranty gives you specific legal rights, and you may have other rights which
vary from state to state.
This warranty does not cover removal or reinstallation costs.This warranty shall
not apply if it is shown by Honeywell that the defect or malfunction was caused by
damage which occurred while the product was in the possession of a consumer.
If you have any questions concerning this warranty, please write Honeywell
Customer Relations, 1985 Douglas Dr, Golden Valley, MN 55422 or call 1-800-468-
1502. In Canada, write Retail Products ON15-02H, Honeywell Limited/Honeywell
Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9.
Honeywell's sole responsibility shall be to repair or replace the product within the
terms stated above. HONEYWELL SHALL NOT BE LIABLE FOR ANY LOSS OR DAM-
AGE OF ANY KIND, INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES
RESULTING, DIRECTLY OR INDIRECTLY, FROM ANY BREACH OF ANY WARRANTY,
EXPRESS OR IMPLIED, OR ANY OTHER FAILURE OF THIS PRODUCT. Some states do
not allow the exclusion or limitation of incidental or consequential damages, so this
limitation may not apply to you.
Automation and Control Solutions
Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
Honeywell Limited/Honeywell Limitée
35 Dynamic Drive
Toronto, Ontario M1V 4Z9
Thank you for choosing a high performance
Honeywell Indoor Air Quality product
Printed in U.S.A. on recycled
paper containing at least 10%
post-consumer paper fibers.
® U.S. Registered Trademark.
© 2006 Honeywell International Inc.
69-1951 M.S. 06-06
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