English
8
NOTE
• Do not remove the air filter except when cleaning.
Breakdown may occur.
4-2
OPTIMUM OPERATION
Observe the following precautions to ensure the system oper-
ates.
• When the display shows “
”, ask a qualified service
person to clean the filters (Refer to MAINTENANCE).
• Do not operate the HRV unit in Bypass mode when the
room air is under heating in winter or when the outside
temperature is 30°C or higher.
This may cause condensation to form on the main unit or on
discharge grill, or around air supply opening.
• Keep the indoor unit and the remote controller at least
1 m away from televisions, radios, stereos, and other
similar equipments.
This may cause distorted picture or noise.
• Turn off the main power supply switch when it is not
used for long periods of time. When the main power
switch is turned on, some watts of electricity is being
used even if the system is not operating.
• Do not install the remote controller where the indoor
temperature and humidity, respectively, are out of the
range of 0-35°C and RH 40-80%.
This may cause malfunction.
• Do not install the remote controller where direct sun-
light may fall on it.
This may cause discoloration or deformation.
NOTE
• When the fan motor fails, the remote controller does not dis-
play any error code.
Usage under that status will lead to insufficient ventilation.
The air supply and exhaust fans should be checked once
every one or two months.
You can make a simple check such as below way.
To check the wind flow, hold a bar of which the end has a
string or other similar lightweight item over the supply grille
and exhaust grille.
4-3
HOW TO CLEAN THE HEAT EXCHANGE
ELEMENT
CLEANING FREQUENCY
AT LEAST ONCE EVERY TWO YEARS
(FOR GENERAL OFFICE USE)
(CLEAN THE ELEMENT MORE FREQUENTLY IF NECES-
SARY.)
WARNING
• Please exchange the heat exchange element if you find
that the knob of the heat exchange element is damaged
or is deteriorated when cleaning it.
There is falling danger.
1. Detach the maintenance cover.
Refer to the section (4-1, 1).
2. Detach the air filter.
Refer to the section (4-1, 2).
3. Take out the heat exchange elements.
Pull out the air filter and then pull out the two heat
exchanger elements.
(Refer to figure 7)
4. Use a vacuum cleaner to remove dust and foreign objects
on the surface of the heat exchange element.
(Refer to figure 10)
• Use the vacuum cleaner equipped with a brush on the
tip of the suction nozzle.
• Lightly contact the brush on the surface of the heat
exchange element when cleaning.
(Do not crush the heat exchange element while clean-
ing.)
CAUTION (During Operation)
• Do not clean touching strongly with a vacuum cleaner. This
may crush the mesh of the heat exchange elements.
• Never wash the heat exchange element with water.
• Have your dealer professionally clean the filter if it is very dirty.
5. Put the heat exchange element on the rail and insert it
securely in place.
6. Install the air filter securely in place.
(Refer to the section (4-1, 4))
7. Install the maintenance cover securely in place.
(Refer to the section (4-1, 5))
CAUTION
• Always use the air filter.
If the air filter is not used, heat exchange elements will be
clogged, possibly causing poor performance and subse-
quent failure.
4-4
INSPECTION OF THE FAN MOTER
NOTE
• When the fan motor fails, the remote controller does not dis-
play any error code.
Usage under that status will lead to insufficient ventilation.
The air supply and exhaust fans should be checked once
every one or two months.
You can make a simple check such as below way.
To check the wind flow, hold a bar of which the end has a
string or other similar lightweight item over the supply grille
and exhaust grille.
5.
TROUBLE SHOOTING
5-1
THE FOLLOWING SITUATIONS ARE NOT
MALFUNCTIONS
• Operation does not start.
<Symptom>
The icon “
” (under centralized control) is dis-
played on the remote controller and pressing the on/off but-
ton causes the display to blink for a few seconds.
<Cause>
This indicates that the central device is controlling the unit.
The blinking display indicates that the remote controller can-
not be used.
<Symptom>
The fans rotates after 1 minutes when pressing on on/off
button.
<Cause>
This indicates that the operation is in preparation.
Wait for about 1 minute.
• Operation stops sometimes.
<Symptom>
“U5” is displayed on the remote controller and the operation
stops but then restarts after a few minutes.
<Cause>
This indicates that the remote controller is intercepting noise
from electrical appliances other than the HRV unit, and this
prevents communication between the units, causing them to
stop.
Operation automatically restarts when the noise goes away.
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