-
-
(6) Heating overload protective control
(a) Operating conditions:
When the outdoor air temperature (TH) is ºC (model 0, 0 : ºC) or higher continues for
0 seconds while the compressor command speed other than 0 rps.
(b) Detail of operation:
) Taking the upper limit of compressor command speed range at 0 rps (model 0, 0 : 0 rps), if the output speed ob-
tained with the fuzzy calculation exceeds the upper limit, the upper limit value is maintained.
) The lower limit of compressor command speed is set to 0 rps (model 0, 0 : rps) and even if the calculated result
becomes lower than that after fuzzy calculation, the speed is kept to 0 rps (model 0, 0 : rps). However, when the
thermo becomes OFF, the speed is reduced to 0 prs.
) Inching prevention control is activated and inching prevention control is carried out with the minimum speed set at 0
rps (model 0, 0 : rps).
) The outdoor fan is set on nd speed.
) The indoor fan is stepped up by speed step. (Upper limit th speed)
(c) Reset conditions:
The outdoor air temperature (TH) is lower than ºC (model 0, 0 : ºC).
(7) Heating low outdoor temperature protective control
• Model 20~35
(a)
Operating conditions:
When the outdoor air temperature (TH) is lower than -0ºC or higher continues for 0 seconds
while the compressor command speed is other than 0 rps.
(b)
Detail of operation:
The lower limit compressor command speed is change as shown in the figure below.
(c) Reset conditions:
When either of the following condition is satisfied.
) The outdoor air temperature (TH) becomes -ºC.
) The compressor command speed is 0 rps.
-10
-7
Lower limit 45 rps
Normal operation
Outdoor air temp.(°C)
• Model 50, 60
(a) Operating conditions:
When the outdoor air temperature (TH) is lower than ºC or ºC or higher continues for 0
seconds while the compressor command speed is other than 0 rps.
(b) Detail of operation:
The lower limit compressor command speed is change as shown in the figure below.
(c) Reset conditions:
When either of the following condition is satisfied.
) The outdoor air temperature (TH) becomes ºC ~ ºC.
) The compressor command speed is 0 rps.
-8
-6
Lower limit 45 rps
Lower limit 32 rps
Normal operation
4
6
11
13
Outdoor air temp.(°C)
