Service manual

Outdoor Unit Functional Concept ESIE05-03
2–48 Part 2 – Functional Description
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3.3.3 Low Pressure Protection Control (RZQ100~140)
Outline In order to prevent abnormal low pressures in the system, the below control function will be activated.
Low pressure is detected by the low pressure switch.
Flow chart
Parameters
Normal operation
LPS activates
Normal operation
&
(When cooling operation)
(When heating operation)
• Within 5 minutes after defrosting
• LPS activates continuously
Upper limit A Hz
Copmressor upper
limit frequency
B Hz
Compressor upper
limit frequency
C Hz
Compressor upper limit
frequency
C Hz
Compressor stop: O Hz
Malfunction stop (E4 indication)
&
• LPS returns
• 30 sec elapsed
10 times or less
stopping in 200 minutes
• LPS activates
• 5 minutes elapsed
10 times or less stopping
in 200 minutes
• LPS activates
• 1 minute elapsed
LPS returns
Condition D*
Condition D*
Stopped 11 times in 200 minutes
• Within 5 minutes after starting
• After 10 minutes after defrosting
Condition D* : &
•OR
• Lp > 0.25 Mpa
LPS activates
• LPS returns
• 1 minute elapsed
• LPS returns
• 30 sec’s elapsed
&
&
&
RZQ100~140B
A Hz 123 Hz
B Hz 72 Hz
C HZ 41 Hz
ESIE05-03.book Page 48 Wednesday, April 6, 2005 4:09 PM