Daikin RZQ Series FCQ20EVA Service Manual page 47

SiME281501E
RZQ36/45LVA, RZQ45/48MYL
(When cooling operation)
Normal operation
Lp < 0.49
MPa
Compressor upper limit
frequency
10 times or less
stopping in 200 minutes
Stopped 11 times in 200 minutes
4.2.11 High Pressure Protection Control
In order to prevent abnormal high pressures in the system and hence avoiding activation of the high pressure
safety device the below control function will be activated.
Details
The high pressure value will be calculated from the low pressure, power input and compressor frequency.
 High pressure switch opens at: 4MPa (tolerance: +0 / -0.15)
 High pressure switch closes at: 3MPa (tolerance: +/- 0.15)
Flow Chart
Hp > (C) MPa
Compressor operation
frequency –1 step/10 sec.
Hp > (D) MPa
Compressor operation
frequency A Hz
• HPS activates
OR
• Hp > (E) MPa
for 1 minute
Compressor stop
• HPS activates
OR • Stopped 16 times
in 300 minutes
Abnormal stop (
Function and Control
• Within 10 minutes after defrosting
• Lp < 0.1 MPa continuous for 5 minutes
&
• Lp < 0.05 MPa
• Lp > 0.59 MPa
&
• 30 sec. elapsed
38 Hz
• Lp < 0.05 MPa
OR
• Lp < 0.1 MPa continues
for 5 minutes
Compressor stop: 0 Hz
Abnormal stop (
(When cooling operation)
Normal operation
Compressor operation
frequency +1 step/1 min.
Compressor operation
frequency +1 step/5 min.
Hp < (F) MPa
E3
indication)
(When heating operation)
Normal operation
• Within 5 minutes after
starting
• Within 10 minutes
• OR
& after defrosting
• Lp < 0.15 MPa
Compressor upper
limit frequency
67 Hz
Lp < 0.1 MPa
Compressor upper
limit frequency
38 Hz
10 times or less stopping
in 200 minutes
E4
indication)
• OR
Condition B : &
• Lp > 0.25 MPa
Hp  (G) MPa
Hp > (C) MPa
Hp  (H) MPa
&
Function Details
Lp > 0.25 MPa
Upper limit 128 Hz
Lp > 0.2 MPa
Condition B
Lp > 0.15 MPa
Condition B
• Within 5 minutes after starting
• After 10 minutes after defrosting
(When heating operation)
Normal operation
• Hp < 2.94MPa
&
• 30 sec. elapsed
Compressor operation
frequency B Hz
• Hp > (I) MPa
OR
• HPS activates
Compressor stop
• HPS activates
• Stopped 16 times in
300 minutes
E3
Abnormal stop ( indication)
15 times or
less stopping
in 300 minutes
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