Daikin RZQG71L9V1, Service Manual

Page: 60 / 215

Function Details ESIE15-13C
46 Function and Control
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
Frequency Restriction
Normal operation
Outdoor unit fan: Stop
Compression ratio < 2.1
Compressor operation frequency
restriction (refer to the followings)
Hp-Lp < 0.93MPa
Hp-Lp < 0.78MPa
Hp-Lp < 0.78MPa
Compression ratio < 1.8
Compression ratio < 1.8
Hp < 1.86MPa
Tfin < 66°C
OR
OR
OR
&
&
&
Compression ratio > 2.4
Hp-Lp > 1.08MPa
Ta > 27°C
OR
OR
Hp < 1.57MPa
Ta < 25°C
Hp < 1.57MPa
Hp < 2.94MPa
Hp-Lp > 0.88MPa
Compression ratio > 2.0
Hp > 1.66MPa
&
OR
Tfin ≥ 81°C
Hp-Lp > 0.98MPa
Compression ratio > 2.2
Hp > 2.25MPa
&
OR
Outdoor unit fan
-1 step/90 sec.
Outdoor unit fan
+1 step/90 sec.
Outdoor unit fan
Step 1
Lower limit frequency
Step 11
RZQG71L
Upper limit frequency
Step 17
Lower limit frequency
Step 11
RZQG100-140L
Upper limit frequency
Step 17
No frequency
restriction
Ta
≤
25°C
Ta > 27°C