Specifications

75
Control mode
Mode Function
RemarksControl
4-way valve
control
Start-up when
outside temper-
ature is low
It takes compressor one minute to restart its operation under one of the fol-
lowing circumstances: 1The power supply has been turned on (reset).
2Over 30 minutes have passed since compressor stops, and the pipe
temperature of outdoor unit (TH3) is -5; or below.
4-way valve
1 min.
ON
OFF
ON
OFF
Compressor
Outdoor unit
Pipe temperature
(TH3)
Power supply is turned on
-5; or less -5; or less
1 min.
30 min.
or more
Control
Condition Control name
RemarksOperation
Start
Defrosting starts when either of below item is satisfied.
1.When the compressor integrating operation time fulfils defrosting time
and when the present outdoor fan step is rated step (15) and the out-
door piping temperature (TH3) is –5˚C or below after 12 minutes have
passed since the compressor start.
2.When the compressor integrating operation time fulfils defrosting time
and when the present outdoor fan step is rated step (15) and the out-
door piping temperature (TH3) is –5˚C or below after 2 minutes have
passed since the compressor start and after reading thermostat OFF/ON
3 times more by the indoor unit room or set temperature.
3.When the compressor integrating operation time is 30 minutes more and
when the outdoor piping temperature (TH3) fulfils below formula, the
present outdoor fan step is rated step (15) and the outdoor piping tem-
perature (TH3) is –5˚C or below after 12 minutes have passed since the
compressor start.
[Formula]
Te=Te10–Te]7°C
Te10 : Coil thermistor temp. (TH3) when 10 minutes have passed
since the compressor start.
Te : Current coil thermistor temp. (TH3)
Stop
Defrosting stops when either of below item is satisfied.
1.When the outdoor piping temperature (TH3) is 22˚C or more within 75
seconds since the defrosting operation starts.
2.When the outdoor piping temperature (TH3) is 13˚C or more after 75
seconds have passed since the defrosting operation starts.
3.When 15 minutes have passed since the defrosting operation starts.
4.When the outdoor unit functions and stops abnormally during defrosting.
The indoor unit
starts defrosting
operation when
the defrosting
signal is trans-
mitted with
simultaneous
defrosting oper-
ation from the
outdoor unit.
Actuator Compressor
Operating except for the following
1.When the outdoor unit reads abnormality.
Bypass solenoid
valve
OFF ordinarily except for the following.
1.U6 (When reading the [Breaking of the compressor over current])
2.UF (When reading the [Breaking of the compressor over current] (lock)
3.U2 (Abnormal discharge temperature)
4.U1 (Abnormal high pressure)
Operation time
chart
Fan
Stop ordinarily
4-way valve
OFF ordinarily
8-4. Defrosting operation
4-way valve
Fan
Compressor
defrosting
start
defrosting
start
defrosting
terminate
defrosting
terminate
Solenoid
valve
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Continued to the next page.
OCT03-E-3.qxp 04.3.26 1:50 PM Page 75