MITSUBISHI ELECTRIC P500YMF-C - Manual (Page 48)

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(11) Control at initial starting
• When the ambient temperature is low (5
°
C or less in cooling and – 5
°
C or less in heating), initial starting will be
performed if the unit is started within 4 hours of the power being turned on.
• The following initial start mode will be performed when the unit is started for the first time after the power has
been turned on.
Start of initial operation mode
Initial operation mode is finished.
Step 1
•
•
• Only the No.1 compressor is operated (f 75 Hz)
Operation of the No.2 compressor is prohibited.
Finished when cumulative operating time reaches
30 minutes.
Pause Step
• Both compressors are stopped, regardless of the
demand from the indoor units. (3 minutes)
Step 2
•
•
• Only the No.1 compressor is operated.
Operation of the No.2 compressor is prohibited.
Operates continuously for 10 minutes and finishes.
Step 3
•
•
Both compressors, No.1 and No.2, are operated
(Forced)
Finished when cumulative operating time reaches
30 minutes.
At the completion of Step
2, if the frequency of No.1
compressor is below the
specified value and if Step
2 has been completed less
than 3 times, the process
does not proceed to Step 3
but rather enters the
Pause Step and then
repeats Step 2.