Table of Contents
Protection Control
6.3
Discharge Pipe Protection Control
This discharge pipe protection control is used to protect the compressor internal temperature
against an error or transient increase of discharge pipe temperature.
HTdi
: Value of inverter compressor discharge pipe temperature (Tdi) compensated with outdoor air temperature
Ti
: Compressor body temperature
A
: Maximum of HTdi and Ti
X(˚C)(Y(˚F)): RXLQ72TA, RXYQ72-120TA
→115˚C (239˚F) (constant)
RXLQ96/120TA, RXYQ144/168TA
→Temperature determined by compressor rotation speed
X (˚C)
110
105
100
A (˚C) > X (˚C)
(A (˚F) > Y (˚F))
3-step down
A (˚C) > X (˚C)
(A (˚F) > Y (˚F))
9-step down
A (˚C) > X+5 (˚C)
(A (˚F) > Y+9 (˚F))
A (˚C) > X+10 (˚C)
(A (˚F) > Y+18 (˚F))
21-step down
A (˚C) > X+15 (˚C)
(A (˚F) > Y+27 (˚F))
HTdi > 135˚C (275˚F)
OR
HTdi > 120˚C (248˚F)
continues for 10 minutes
Ti > 120˚C (248˚F)
continues for 5 seconds
Ti > 115˚C (239˚F)
continues for 10 minutes
57
Y (˚F)
230
221
212
80 90
Upper limit compressor step:
max (Max. Step)
Normal Operation
After 30 seconds
After 20 seconds
After 30
seconds
Current
step
maintained
After 30 seconds
After 20 seconds
After 20 seconds
Compressor step: 1
Discharge pipe temperature
standby
(2 times within 100 minutes)
120
Compressor
rotation speed (rps)
9-step up
A (˚C) < X–10 (˚C)
(A (˚F) < Y–18 (˚F))
A (˚C) < X–5 (˚C)
(A (˚F) < Y–9 (˚F))
3-step up
Discharge pipe temperature standby
(3 times within 100 minutes)
Abnormal stop
(F3 is displayed)
SiUS341802E
Functions and Control
- Quick Links:
- Outdoor Unit
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Troubleshooting
