Hot Start Control (In Heating Operation Only) - Daikin VRV IV-S RXTQ-TAVJU Series Service Manual

Outline of Control (Indoor Unit)
6.5

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.
FXTQ
59
Defrost ending or oil return ending
or thermostat ON
Hot start control
H/L remote
controller setting
LL
OFF
Remote controller
setting
Po (Horizontal)
TH : Temperature detected with the gas thermistor
2
TC : High pressure equivalent saturated temperature
Hot start start conditions
· Starting condition 1: Defrost ending or
OR
oil return ending
· Starting condition 2: Thermostat ON
Hot start control
H/L remote
controller setting
LL
OFF
ON
OFF
ON
OFF
TH : Temperature detected with the gas thermistor
2
TC : High pressure equivalent saturated temperature
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
The fan is ON: ON
The fan is OFF: OFF
Hot start ending conditions
·
Lapse of 3 minutes
·
OR
TH > 34˚C (93.2˚F)
2
·
Tc > 52˚C (125.6˚F)
Normal control
Normal control
Hot start ending conditions
• lapse of 3 minutes
OR
• TH > 34˚C (93.2˚F)
2
• Tc > 52˚C (125.6˚F)
Hot start delay
30 sec.
Normal control
Normal control
Normal control
Functions and Control
SiUS331604E