Outline of Control
SiE-05C
238
Functions PLUS Series
4.11
Cooling Overload Control
Controls electronic expansion valve aperture of indoor units to prevent low pressure from rising abnormally
if many indoor units are operating.
4.12
Inverter Protection Control
4.12.1 Step Down Control by Inverter Current
Reduces compressor operating capacity if current is detected to be in excess of the setting value in order
to protect the inverter from overcurrent.
4.12.2 Step Down Control by Inverter Fin
Reduces compressor operating capacity if current exceeds the setting value in order to prevent the
temperature of the inverter itself from rising above the setting value.
4.13
Standby by Outdoor Temperature When Heating (For Heat Pump System)
If outdoor temperature is above 27˚C when heating, forces the compressor to stop to prevent safety
devices from tripping or sensor malfunction. (Same as off by thermostat.)
Indoor unit EEV
aperture = 450 PLS
Normal cooling
LP > 7k
or
3 minutes elapse following
STEP 1 with LP > 6.6k
LP > 7k
or
3 minutes elapse following
STEP 1 with LP > 6.6k
LP > 7k
or
3 minutes elapse following
STEP 1 with LP > 6.6k
LP < 2k
or
10 minutes
elapse following
STEP 1 with LP < 6k
LP < 2k
or
10 minutes
elapse following
STEP 2 with LP < 6k
LP < 2k
or
10 minutes
elapse following
STEP 3 with LP < 6k
LP < 2k
or
10 minutes
elapse following
STEP 4 with LP < 6k
Indoor unit EEV
aperture = 550 PLS
Indoor unit solenoid valve
aperture = 500 PLS
Indoor unit EEV
aperture = 400 PLS
STEP 1
STEP 2
STEP 3
STEP 4
LP > 6.6k
(k:kg/cm
2
)
(VF120)
IN conditions
Control contents
27A or more
detected
Capacity lowered one step from compressor capacity at this point is used as upper limit.
→
After that, one step is advanced every three minutes if current doesn’t exceed the setting
value.
OUT conditions
Upper limit frequency is canceled if:
106 + ON when INV outdoor unit only is operating.
(106 + ON) + (ON + ON) if 2 systems operating
(106 + ON) + (ON + ON) + (On + ON) if 3 systems operating
IN conditions
Control contents
Fin temp. 92˚C or
higher detected
Capacity lowered one step from compressor capacity at this point is used as upper limit.
→
After that, one step is advanced every three minutes if current doesn’t exceed 87˚C.
SI-05C.BOOK Page 238 Monday, November 6, 2000 4:13 PM
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