Hot Start Control (In Heating Operation Only) - Daikin VRV RXYQ72-384XAYCA Service Manual

SiUS342004EB
9.9

Hot Start Control (In Heating Operation Only)

At startup with thermostat ON or after the completion of defrosting in heating operation, the indoor
fan is controlled to prevent cold air from blasting out and ensure startup capacity.
TH2: Temperature detected with the gas thermistor
Tc: High pressure equivalent saturated temperature
 FXTQ-TA, FXTQ-TB (when the heater is to be used)
Part 4 Functions and Control
Starting condition
·
Defrost ending
·
OR
Oil return ending
·
Thermostat ON
Hot start control
H/L remote
controller setting
LL
OFF
Remote controller
setting
P0 (Horizontal)
Starting condition
·
Defrost ending
·
OR
Oil return ending
·
Thermostat ON
Hot start control
Airflow rate at
heater startup
LL
OFF
ON
OFF
Hot start in progress
The fan is not OFF before initiating the hot start: LL
The fan is OFF before initiating the hot start: OFF
Hot start in progress
The fan is not OFF before initiating the hot start: LL
The fan is OFF before initiating the hot start: OFF
Outline of Control (Indoor Unit)
Ending condition
·
Lapse of 3 minutes
·
OR
TH2 > 34°C (93.2°F)
·
Tc > 52°C (125.6°F)
Normal control
Normal control
Ending condition
·
Lapse of 3 minutes
·
OR
TH2 > 34˚C (93.2˚F)
·
Tc > 52˚C (125.6˚F)
Normal control
Normal control
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