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166
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Model
Item
Units: rps
Outdoor unit
Maximum required speed
Minimum required speed
201
95[90]
(2)
30
151
75(70)
(1)
30
251
125
40
(4) Operation control function by the outdoor controller
♦
Models FDCVA151 ~ 251
(a) Deciding the compressor speed
The indoor unit’s return air temperature and the set temperature are used to carry out fuzzy calculations, then the required
speed is decided. After that compressor speed adjustment by any protection control is taken into account the actual compres-
sor speed is decided.
Unit required speed
1) Dehumidify and cooling operation
Model
Item
Units: rps
201
251
Outdoor unit
Maximum required speed
Minimum required speed
95
30
151
80
30
125
40
(b) Compressor soft start control
1) Compressor protective start
I
When conditions are as shown below, carry out compressor protective start
I
.
a) Unit has been stopping for less than 6 hours since previous stop, and this start is the 2nd or subsequent cumulative
compressor start since the power was turned ON.
The compressor starts synchronous operation 5 seconds after thermostat ON.
During this control, the compressor speed is gradually increased by 2 rps/30 (40) seconds from the lower limit
30 (40) rps up to the target speed (the upper limit) 64 rps.
This control is terminated at 3 minutes after the compressor started.
Note (1) Values in ( ) show for the 251 model.
2) Compressor protective start
II
If any of the following conditions is satisfi ed, compressor protective start II is implemented.
a) It has been 6 hours or longer since the power was turned on, and this is the fi rst cumulative compressor start since
the power was turned ON.
b) If the compressor is stopped for 6 hours or longer, and this is the second or subsequent cumulative start since the
power was turned ON.
The compressor starts synchronous operation 5 seconds after thermostat ON.
The compressor speed is gradually increased by 2 rps/second from the lower limit 30 (40) rps up to the target
speed (the upper limit) 64 rps for 30 seconds after the compressor started.
After the compressor speed reaches the upper limit 64 rps, the compressor speed is decreased by 1 rps/second up
to the lower limit 30 (40) rps and is retained at the lower limit speed until 3 minutes passed after the compressor
started.
After the termination of item
controlling period, if the required speed is higher than the lower limit 30 (40) rps,
the compressor speed is increased again by 6 rps/30 seconds up to the upper limit speed until 6 minutes passed
after compressor started. And then this control is terminated.
Model
Item
FDCVA151, 201
FDCVA251
Lower limit speed
30
40
Upper limit speed
64
64
Units: rps
2) Heating operation
Note (1) Values in ( ) show for the FDK series.
(2) Values in [ ] show for the FDT, FDK series.
