Daikin RZQG71~140L7V1B Service Manual page 123

Function Details
3.2.19 Low Outdoor Air Temperature Control in Cooling Operation
Controls compressor and outdoor unit fan under low outdoor air temperature condition to secure
pressure difference between high and low pressure.
Hp: High pressure
Lp: Low pressure
Ta: Outdoor air temperature
Tfin: Inverter fin temperature
OR
&
Hp < 1.86MPa
Ta < 25°C
OR
&
Hp < 1.57MPa
OR
&
Hp < 1.57MPa
Tfin < 66°C
Frequency Restriction
112
Hp-Lp < 0.93MPa
Compression ratio < 2.1
Compressor operation frequency
restriction (refer to the followings)
Hp-Lp < 0.78MPa
Compression ratio < 1.8
Outdoor unit fan
-1 step/90 sec.
Hp-Lp < 0.78MPa
Compression ratio < 1.8
No frequency
restriction
Normal operation
Outdoor unit fan: Stop
RZQG71L
Lower limit frequency
Ta 25°C
Step 11
Upper limit frequency
Ta > 27°C
Step 17
Hp-Lp > 1.08MPa
OR
Hp < 2.94MPa
Compression ratio > 2.4
OR
Ta > 27°C
Outdoor unit fan
+1 step/90 sec.
Hp-Lp > 0.98MPa
&
Compression ratio > 2.2
OR
Hp > 2.25MPa
Outdoor unit fan
Step 1
Hp-Lp > 0.88MPa
&
Compression ratio > 2.0
OR
Hp > 1.66MPa
Tfin ³ 81°C
RZQG100-140L
Lower limit frequency
Step 9
Upper limit frequency
Step 15
Function and Control
ESIE12-06