Low Pressure Protection Control - Daikin ALTHERMA HT Service Manual
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Also See for ALTHERMA HT:
- User manual (12 pages) ,
- Installer's reference manual (296 pages)
Table of Contents
Protection Control
4.2 Low Pressure Protection Control
This low pressure protection control is used to protect compressors against the transient
decrease of low pressure.
In heating operation [R-410A]
Pe<0.17MPa
Low pressure limited
56
Low pressure not limited
INV upper limit frequency :
3-step down from current
compressor frequency
Pe<0.17MPa
After 10 sec.
Current step limited
Pe>0.20MPa
After 15 sec.
INV upper limit frequency :
1-step up from current
compressor frequency
Pe< 0.07MPa
Low pressure
standby
Pe: LP pressure sensor detection
value
• Pe>2.3MPa
or
Reach INV freq = MAX INV freq for each HP
When occurring 3 times within 30 min., the
malfunction code "E4" is output.
ESIE09-08B
Hot gas SVP = OFF
Pe<0.12MPa
Pe>0.17MPa
Hot gas SVP = ON
Function
Table of Contents
Troubleshooting
