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Hitachi RAS-25QH1 Technische Information Seite 215

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2.
The outdoor unit does not operate (remote contro! command can be received).
NO
Does
LD701
fight when
the heating
operation is done with the temperature
set to 32°C using the remote controller?
Check the room temperature thermistor]
and replace if it is defective.
(Normal value) 20°C — approx. 12.5k Q
25°C — approx. 10k Q
30°C -> approx. 8k Q
YES
:
_ _ )
NO
Does: LO7O1 light when. the. cooling
Check the heat exchanger thermistor
operation is done with the temperature
and replace if it is defective
set to 16°C using the remote controller?
(Normal value) 20°C —» approx. 125kQ
25°C — approx. 10k Q
YES
30°C — approx. 8k Q
YES
;
fa
Are
indoor/outdoor
communication
signals
superimposed
on
the DC
Check
the electrical
parts
in the
35V of connection cable A, B?
outdoor
unit and
repair
defective'
38Hz approx.
parts (around the outdoor interface
2Vp-p
transmitting circuit).
Does
LD305
of outdoor
electrical
parts blink 1 time?
Approx.
35\y HAL
OV
NO
YES
Check
the
indoor
transmitting
circuit
and
defective parts.
Is an
indoor
transmitting
signal
generated at the collector of Q801?
38Hz approx.
v 2Vp-p transmitting
Approx.
ov
YES
Check
the electrical parts in the
outdoor
unit and
repair
defective
parts (around the outdoor interface
transmitting circuit).
one
YES
Check the electrical parts in the
Is LD701 turned OFF within several See
outdoor unit and repair defective
ten seconds after it is lit?
parts
| Perform a final check of operation. |
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