Daikin FTX25JVEA9 Service Manual page 132

Si18-201
Determination of initial frequency for heating
Initial frequency FSR is determined based on the correction of outside air temperature (DOA)
and discharge pipe temperature (DO) in accordance with the above matrix.
FSR = KFIDO × (-5/128 × (DOA - 15°C) × FINI1+FINI1)
3/ KFIDO varies depending on discharge pipe temperature DO
When DO ≥ DOFINI (45°C): KFIDO = KFIDOH (128/128) --- Hot start
When DO < DOFINI (45°C): KFIDO = KFIDOL (179/128) --- Cold start
Main Functions
Hot start
Cold start
300%
250%
200%
150%
100%
50%
0%
-20 -15 -10 -5 0
Reference Outside Air
Temperature
15°C
Outside Air
Temperature
-15
-10
-5
0
5
10
15
20
25
Outside
10 15 20
air temperature
Hot Start
128/128
Hot Start Cold Start
217.2% 303.7%
197.7% 276.4%
178.1% 249.1%
158.6% 221.8%
139.1% 194.5%
119.5% 167.2%
100.0% 139.8%
80.5% 112.5%
60.9% 85.2%
System control
25 30
(M1010)
Cold Start
179/128
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