Hitachi RAS-10JH4 Service Manual page 73

TWO WAY AIR EXCHANGE MODE
Q1 Up to what length the two way air
exchange hose can be extended?
Q2
Is there any limit to the number of bending
of the two way air exchange hose?
Q3
What should I do if I do not want fresh air
in operation or fresh air in & exhaust
operation?
Q4
What is the power consumption during two
way air exchange operation?
Q5
Are there any conditions to prohibit two
way air exchange operation?
Q6
Do the filters need to be replaced?
A1 • There is a restriction to the length of the two way air
exchange hose (maximum length is 3m).
A2
• If the hose length is 3m or shorter, the hose can be
bent (at 90 degrees) up to 4 times.
• Two Way Air Exchange Selection Swtich
A3
① Prohibit Two Way Air Exchange
② Only Exhaust
③ Operate Two Way Air Exchange
(Refer to page 20 in Operation Manual.)
•
Operation at HI level
A4
11.5W
•
Operation at MED level
8.7W
•
Operation at LOW mode
8.5W
•
Exhaust Operation
A5
• When the temperature inside the room is more than
about 43°C,the exhaust does not operate to protect
the exhaust fan from damage.
• When the above mentioned operation has
stopped, the "Two Way Air Exchange" lamp on
the indoor unit indicators blinks (lights for 10
seconds/light off for 1 second).
•
Fresh Air In Operation
• When the air temperature outside the room is more
than about 30°C or less than about 3°C, the fresh air
in does not operate to prevent dew condensation on
the two way air exchange fan and hose and to save
energy.
• If the difference in temperature between the inside
and outside of the room is more than about 7°C, the
fresh air in does not operate to prevent dew
condensation on the two way air exchange fan and
hose, while cooling operation.
• If the difference in temperature between the inside
and outside of the room is more than about 22°C, the
fresh air in does not operate to prevent dew
condensation on the two way air exchange fan and
hose, while heating operation.
• When the above mentioned operation have
stopped, the "Two Way Air Exchange" lamp on
the indoor unit indicators blinks (lights for 10
seconds/light off for 1 second).
• Replacement is not necessary for Pre-Filter on the
A6
main unit and the Fresh Air In Pre-Filter.
① Deodorization/Dust Collecting Fresh Air In Filter
can be repeatedly used by washing it with water.
However, this filter needs to be replaced
approximately once every 3 years.
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