Inverter Current Protection Control; Control By Inverter Fin Temperature - Daikin SkyAir Super Inverter 70 D Series Service Manual

Function Details
4.2.18 Suction Pipe Superheat Protection Control (Only in heating
operation)
In heating operation, controls compressor operating frequency to prevent oil from remaining in
the outdoor unit heat exchanger by the continuous operation of compressor at high superheated
degree of the suction pipe.
or

4.2.19 Inverter current protection control

Restricts compressor operation frequency to prevent compressor from tripping due to inverter
overcurrent.
Drooping current
Outside
temperature

4.2.20 Control by inverter fin temperature

Restricts compressor operation upper limit frequency to prevent compressor from tripping due
to inverter fin temperature.
Inverter upper limit frequency
= Maximum frequency
90
Suction SH>12deg
Suction SH>10deg
&
EV opening degree=480pls
or
Lowering upper limit
frequency for 1-step
every 30 seconds
or
Inverter current
>Drooping current
Compressor frequency
–1 step/10 sec
Model RZP71D
P(A)
14A
Q(A)
Q(A)
P(A)
25˚C 28˚C
(S2552)
Inverter fin temperature ≥ A˚C
Normal operation
Compressor frequency
Model RZP71D
A˚C 85˚C
B˚C 82˚C
Normal operation
Suction SH<6deg
or
Upper limit frequency = Maximum frequency
Suction SH<6deg
Suction SH<8deg
Suction SH<10deg
&
EV opening degree<450pls
Raising upper limit
frequency for 1-step
Suction SH>12deg
Suction SH>10deg
&
EV opening degree=480pls
Normal operation
Compressor frequency
The condition of Inverter current<Drooping
current continues for 3 minutes
Model RZP100~140D
24A
25A
+1 step/3 min Fin temperature ≤ B˚C
lasts for 3 minutes
Model RZP100~140D
93˚C
90˚C
every 30 seconds
(S2568)
Inverter upper limit frequency
= Maximum frequency
+1 step/3 min
(S2551)
Compressor frequency
–1 step/10 sec
(S2553)
Function and Operation
SiE25-110