Specifications

66
5. LEV
RP8, 10
Control modes RemarksControl details
5-2. Normal control
LEV opening pulse will be controlled according to the change of compressor
operating frequency and regulated to adjust the SC to let the target SC range.
• Control timing: Once per minute after 3 minutes have passed since the
compressor started.
• Opening pulse range: The following range is specified according to the
compressor operating frequency.
• Opening pulse range corresponding to the change of compressor operating
frequency
Opening pulse range = Amount of frequency change O 2.5 pulse
• Opening pulse range corresponding to the SC setting : Max. i 9 pulse
• Compressor start-up
Opening pulse will be adjusted according to only the change of frequency
during 3 minute start-up.
Discharge super
heat temp. is
calculated from
discharge temp.
(TH4) and
outdoor
cond./eva. temp.
(TH6).
5-7. Others
1 LEV opening pulse is set to 400 while the compressor is being stopped.
2 After LEV opening pulse is initialized to 0 by making 700 pulse down from
the present pulse, set the pulse to 400.
Compressor
frequency
49Hz or less
50Hz to 75Hz
76Hz to 90Hz
91Hz or more
110~ 300
110~350
120~400
120~460
PUHZ-RP8, 10YHA
Opening pulse range (Lower limit to upper limit)
5-1. Target sub cool (SC)
Compressor operating frequency < 40Hz Target SC step = 2
Compressor operating frequency ] 40Hz Target SC step = 3
Target SC step
1
2
3
4
Target SC range
2:~4:
3:~5:
5:~8:
8:~10:
5-3.Target SC correction by discharge temperature (TH4)
The target SC is corrected according to the discharge temperature.
• Range of discharge temperature (TH4) correction : 100:~ 105:
• Range of correction in step of target SC : - 1~ 0
5-4.Target SC correction by discharge super heat
The target SC is corrected according to the discharge super heat.
• Range of discharge super heat correction : 10:~15:
• Range of correction in step of target SC : 0~ +1
5-5.Lower opening correction by discharge temperature (TH4)
The lower opening of LEV is corrected according to the discharge temperature (TH4).
• Range of discharge temperature (TH4) correction : 115: or more
• Amount of correction of lower opening : +10pulse (every minute, Max.+30 Pulse)
5-6.Lower opening correction by discharge super heat
• Range of discharge super heat correction : 50: or more
•
Amount of correction of lower opening : +10pulse (every minute, Max. +100 Pulse)
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