Honeywell ER90 User manual

OWNER’S GUIDE
J. H. • Rev. 1-93 • Printed in U.S.A. • Form Number 69-0737B—1
ER90/100/200
HOME
VENTILATION
SYSTEMS

WELCOME…
…to the world of efficient ventilation. Engineered and
built for long, trouble-free operation, this Honeywell
ER90/100/200 Home Ventilation System provides
proper levels of ventilation with energy savings by
transferring heat and moisture between the exhaust and
fresh air streams. Your home will now be better pro-
tected from indoor pollutants such as formaldehyde,
tobacco by-products, radon, moisture, combustion by-
products and carbon monoxide. With the Honeywell
Home Ventilation System you can expect to enjoy the
benefits of a properly ventilated energy efficient home
for years to come.
Features and benefits:
• Recover up to 85 percent of the total heating or
cooling energy in the exhaust air.
• Reduce air conditioning load by up to 0.4 ton during
air conditioning season.
• Operates condensation free. No drain required.
• Easy-to-clean energy transfer wheel assures years
of trouble-free operation.

CONTENTS
1 69-0737B—1
PAGE
CONTROLS FOR YOUR HOME VENTILATION SYSTEM ................... 2
OPERATING YOUR HOME VENTILATION SYSTEM .......................... 3
GETTING THE MOST FROM YOUR HOME
VENTILATION SYSTEM ................................................................... 4
MAINTENANCE INSTRUCTIONS FOR THE HOME
VENTILATION SYSTEM ................................................................... 6
WARRANTY......................................................................................... 10
BENEFITS OF PERFECT CLIMATE™ AND THE HOME
VENTILATION SYSTEM ................................................................. 11

2
CONTROLS FOR YOUR HOME VENTILATION SYSTEM
1. FRESH AIR CONTROL
Controls the air flow rate in the
system, allowing the home-
owner to change the air flow
rate as conditions in the home
change. To select the desired
air flow rate position, move the
knob on the controller to the
desired level. See Fig. 1.
2. DEHUMIDISTAT
Select the desired inside
humidity level for the home.
The dehumidistat will override
the fresh air control and cause
the Home Ventilation System
to operate at high speed until
humidity levels are reduced to
the humidistat setting. At this
point, the dehumidistat will turn
off and airflows will return to
the fresh air control setting. For
summer operation, set
dehumidistat to
OFF position.
3. MASTER SWITCH
This switch is located on the
unit cover. The switch turns off
the unit completely, disabling
the fresh air control,
dehumidistat and blowers. See
Fig. 2.
Fig. 1—Fresh air control for
Home Ventilation System.
FRESH AIR CONTROL
H
I
A
U
T
O
L
O
HI LO
RANGE
SELECT HI OR LO RANGE - ADJUST AIRFLOW
FRESH AIR CONTROL
MAX
OFF
MIN
INDICATOR
LIGHT
FRESH AIR
CONTROL
KNOB
RANGE
SWITCH
ER90
ER100/200 REMOTE CONTROL
M3333
HI OFF LO
OFF
ON
ER100/200ER90
MASTER SWITCH IS ALSO
RANGE SWITCH. M3328
1
1
Fig. 2—Master switch on the
Home Ventilation System cover.
Your Home Ventilation System comes equipped with a factory supplied
control package consisting of:

3 69-0737B—1
OPERATING YOUR HOME VENTILATION SYSTEM
STEP 1
Set the master
ON/OFF switch located on the Home Ventilation System to
ON or LO position. The switch light should come on. The system will now
operate whenever the fresh air control or dehumidistat is turned on.
STEP 2
Turn the fresh air control knob to start the unit blowers. The indicator light
should light. The fresh air control varies the speed of the blower. This
allows you options for the amount of ventilation. The Home Ventilation
System is a balanced system; the amount of fresh air introduced into the
house is always balanced with the amount of air exhausted from the
house. Increase the ventilation rate if you feel the house is stuffy, or if
there is an above average occupancy rate. In most applications, a
midrange setting on the fresh air control will provide proper ventilation. On
some units, you may also select a
HI or LO range when adjusting
ventilation.
STEP 3
When using a dehumidistat, set the dehumidistat to the desired humidity
level. If your heating system has a powered humidifier, be sure the
dehumidistat is set at least ten percent relative humidity above your
humidistat. It may be necessary to lower the humidistat setting to avoid
condensation in the winter. This ensures a proper humidity level in the
home. Set dehumidistat to
OFF position for summer operation.
STEP 4
Your system is now fully functional. Perform an occasional check to
ensure that the exhaust and intake outlets for the unit are clear. You
should check that intake outlets are not close to any source of contamina-
tion such as barbecues or automobile exhaust. If you find a source of
contamination close, move it. Be sure to check that the exhaust air is not
being directed to the intake air hood.

GETTING THE MOST FROM YOUR HOME VENTILATION SYSTEM
FRESH AIR CONTROL
The low voltage remote fresh air controls (ER100/200 only) allow conve-
nient operation of the ventilation system from the living area of your home.
The control performs the following four functions:
1. A two-position
HI-LO range switch lets you place the ventilator into
LO or HI speed range. Only certain models have this feature.
2. The control knob allows selection of continuous ventilation rates
within the pre-selected
HI or LO speed range.
3. This same knob is used to place the ventilator into the
AUTO mode.
In AUTO, the blower is operated by the dehumidistat and/or
override switches that can be installed as options with your Home
Ventilation System.
4. An indicator light above the
HI-LO switch verifies operation of the
unit.
MOISTURE CONTROL
Continual operation of the ventilation is recommended for optimum
reduction of indoor air pollution and control of humidity. Increased
moisture removal will always occur at maximum ventilation rates. This
setting should be used when first occupying a newly built home to
remove excess moisture from new wood, plaster, cement and other
moisture absorbing construction materials. If your system is wired
to a dehumidistat, preselected moisture levels can be maintained
automatically. Severe moisture conditions can be controlled with the
sensible energy transfer wheel when the indoor air contains more
moisture than the outdoor air.
REMOTE OVERRIDE SWITCH FUNCTIONS
Your ventilation system may incorporate one or more remotely located
switches to activate bathroom ventilation, a dehumidistat, or any combina-
tion of these or other ventilation functions. A remote switch in the
ON
position will cause the ventilator to operate at high speed until the override
switch is turned off. The ventilator will automatically return to its previous
setting on the fresh air control. The remote override switch, in combination
with the
AUTO mode, is especially useful for intermittent bathroom
exhaust when continuous ventilation is not required. Continuous operation
is recommended except when the home is unoccupied, or when proper
ventilation is provided by other means like open doors and windows.
4

5 69-0737B—1
FROST CONTROL
Some Home Ventilation System models have built-in automatic preheat
frost control systems that allow the unit to operate in cold weather regions.
Areas where the winter design temperature does not fall below 5°F [-15°
C] will not require a preheater. The function of the frost control is to ensure
that the intake air brought into the Home Ventilation System is not below
10°F [-12°C]. This ensures proper operation of the Home Ventilation
System. Operation is indicated by the indicator light located on the Home
Ventilation System cabinet next to the
PRESS-TO-TEST button. The
indicator light is on when the outdoor temperature is below 10°F [-12°C]
or the
TEST button is pressed. The preheat system is functioning if the
indicator light comes on when the TEST button is pressed. Test the
preheat system before the heating seasons starts each year. Follow the
instructions on the cabinet for testing.
IMPORTANT:
Release the TEST button as soon as the neon light comes
on. Pressing the TEST button longer can cause overheating of the
Home Ventilation System.

6
MAINTENANCE INSTRUCTIONS FOR THE HOME
VENTILATION SYSTEM
!
CAUTION
Electric shock hazard.
Can cause personal injury or equipment damage.
Disconnect power supply before doing maintenance.
The Home Ventilation System must be maintained on a regular basis for
the best efficiency. Honeywell recommends the Home Ventilation System
to be cleaned and checked at least twice a year, preferably at the start of
each heating and cooling season.
CAUTION
Make sure the master switch is in OFF position before doing any
maintenance.
Check and/or clean as follows:
Room Air Filter: Remove and wash this wire mesh filter to assure
proper airflow in the unit. See Fig. 3. Only the ER90/100s have the
room air filter.
!
THUMB-
SCREWS
M3324
THUMB-
SCREWS
COVER
FRESH
AIR
INTAKE
FILTER
STALE AIR
INTAKE FILTER
Fig. 3—ER90/100 stale air intake filter and fresh air filter location.

7 69-0737B—1
Fresh Air Filter: Replace the fresh air filter at least twice a year. To
remove filter:
1. Unscrew access panel thumbscrews to remove the filter access
panel. See Figs. 3 and 4.
2. Slide the fresh air filter out of the Home Ventilation System.
3. Check filter and replace if clogged.
4. Place the filter access panel back on the Home Ventilation
System and tighten the thumbscrews.
Weather Caps: Check to ensure that the outside fresh air inlet and
exhaust weather caps do not become clogged with debris like
grass, leaves and snow.
Energy Transfer Wheel: Check the energy transfer wheel for build-up
of dirt and debris.
NOTE: Energy transfer is not affected by stained surfaces.
To remove and clean the ER90/100s Energy Transfer Wheel:
1. Unscrew the screws holding the Home Ventilation System cover
and remove the cover. See Fig. 5.
2. Take out the center divider.
3. Loosen the screw in the center of the wheel hub cap.
4. Rotate hub cap counterclockwise and remove.
5. Grasp hub with two fingers and take straight off the drive shaft.
IMPORTANT:
Lift only by the hub.
M3323
FRESH
AIR FILTER
THUMB-
SCREWS
Fig. 4—ER200 fresh air filter location.

8
5. Spray the energy transfer wheel thoroughly with household spray
cleaner (Fantastic™or equivalent). Rinse with warm water. Use
a soft brush to remove stains between the plastic windings.
Shake excess water from the wheel.
6. Replace the wheel on the drive shaft.
NOTE: Rotate the wheel counterclockwise until the pin in the shaft has
engaged in the slot in the bottom of the hub. The end of the drive
shaft and the face of the hub will be flush.
Fig. 5—ER90/100 Energy Trans-
fer Wheel and belts location.
7. Put hub cap on, rotate
in clockwise direction,
tighten screw.
8. Install the center divider.
9. Replace the Home
Ventilation System
cover and tighten the
screws.
To remove and clean the
ER200 Energy Transfer
Wheel:
1. Unscrew the screws
holding the ventilator
door and open the door.
2. Take out the center
divider.
3. Remove the belt from
the rim of the wheel.
See Fig. 6.
4. Unscrew the screw in
the center of the hub.
5. Use the rim of the wheel
and lift the wheel
straight off the drive
shaft.
6. Spray the energy
transfer wheel thor-
oughly with household
spray cleaner (Fantas-
tic™or equivalent).
Rinse with warm water.
Use a soft brush to
remove stains between
M3325
ENERGY TRANSFER
WHEEL HUB CAP
DRIVE BELT SET
BLOWER
AND
MOTOR
ENERGY
TRANSFER
WHEEL
Fig. 6—ER200 Energy Transfer
Wheel and belts location.
M3322A
WHEEL DRIVE
PULLEY
WHEEL DRIVE
BELT
WHEEL DRIVE
MOTOR
ENERGY
TRANSFER WHEEL