Daikin VRV RXYQ72-384XAYCA, Service Manual

Page: 104 / 419

Protection Control SiUS342004EB
97 Part 4 Functions and 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.
Normal control
3-step down 9-step up
9-step down
3-step up 21-step down
After 30 seconds After 20 seconds
After 20 seconds After 30 seconds
A (°C) > X (°C)
( A (°F) > Y (°F))
A (°C) < X –10 (°C)
( A (°F) < Y –18 (°F))
A (°C) > X +5 (°C)
( A (°F) > Y +9 (°F))
A (°C) < X –5 (°C)
( A (°F) < Y –9 (°F))
A (°C) > X +10 (°C)
( A (°F) > Y +18 (°F))
A (°C) > X +15 (°C)
( A (°F) > Y +27 (°F))
A (°C) > X (°C)
( A (°F) > Y (°F))
Compressor step: 1
After 20 seconds
HTdi > 135°C (275°F)
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
OR
HTdi : Value of compressor discharge pipe temperature (Tdi) compensated with outdoor air temperature
Ti : Compressor body temperature
A : Maximum of HTdi and Ti
X (°C)(Y (°F)) : RXYQ72-120XA, RXYQ72-120XB
→115°C (239°F) (constant)
RXYQ144/168XA, RXYQ144/168XB
→Temperature determined by compressor rotation speed
Upper limit compressor step:
max (Max. Step)
Current
step
maintained
Discharge pipe temperature standby
(3 times within 100 minutes)
Abnormal stop
( F3 is displayed)
Discharge pipe temperature
standby
(2 times within 100 minutes)
After 30
seconds
100
105
110
X (°C)
212
221
230
80 90 120
Y (°F)
Compressor
rotation speed (rps)