Cooling Overload Control; Inverter Protection Control; Standby By Outdoor Temperature When Heating - Daikin VRV Inverter K Series Manual

SI-05C.BOOK Page 238 Monday, November 6, 2000 4:13 PM
Outline of Control

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.
LP > 6.6k
Normal cooling
LP < 2k
or
10 minutes
elapse following
STEP 1 with LP < 6k

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.
IN conditions
27A or more
detected
OUT conditions
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.
IN conditions
Fin temp. 92˚C or
higher detected
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.)
238
LP > 7k LP > 7k
or or
3 minutes elapse following 3 minutes elapse following
STEP 1 with LP > 6.6k STEP 1 with LP > 6.6k
STEP 1 STEP 2
Indoor unit EEV
Indoor unit solenoid valve
aperture = 550 PLS aperture = 500 PLS
LP < 2k
or
10 minutes
elapse following
STEP 2 with LP < 6k
Control contents
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.
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
Control contents
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.
LP > 7k
or
3 minutes elapse following
STEP 1 with LP > 6.6k
STEP 3
Indoor unit EEV
aperture = 450 PLS
LP < 2k LP < 2k
or or
10 minutes 10 minutes
elapse following elapse following
STEP 3 with LP < 6k STEP 4 with LP < 6k
: http://splitoff.ru/tehn-doc.html
Functions PLUS Series
SiE-05C
2
(k:kg/cm )
STEP 4
Indoor unit EEV
aperture = 400 PLS
(VF120)