Hot Start Control (In Heating Only) - Daikin VRV-WIII RWEYQ72PTJU Service Manual

Outline of Control (Indoor Unit)
9.8

Hot Start Control (In Heating Only)

At startup with thermostat ON or after the completion of defrosting in heating operation, the indoor
unit fan is controlled to prevent cold air from blasting out and ensure startup capacity.
[Detail of operation]
When either the starting condition 1 or the starting condition 2 is established, the operations
shown below will be conducted.
 FXTQ
At startup with thermostat ON or after the completion of defrosting in heating operation, the indoor
unit fan is controlled to prevent cold air from blasting out and ensure startup capacity.
[Detail of operation]
When either the starting condition 1 or the starting condition 2 is established, the operations
shown below will be conducted.
74
Defrost ending or oil return ending
or Thermostat ON
Hot start control
H/L remote
controller setting
LL
The fan is not OFF before initiating the hot start: LL
The fan is OFF before initiating the hot start: OFF
OFF
Remote controller
setting
Po (Horizontal)
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
The fan is not OFF before initiating the hot start: LL
The fan is OFF before initiating the hot start: OFF
OFF
ON
OFF
ON
The fan is ON: ON
The fan is OFF: OFF
OFF
TH
TC : High pressure equivalent saturated temperature
Hot start ending conditions
OR
Hot start in progress
Hot start ending conditions
OR
Hot start in progress
: Temperature detected with the gas thermistor
2
SiUS30-1301
·
lapse of 3 minutes
·
[TH2] > 93.2˚F
·
"Tc" > 125.6˚F
Normal control
Normal control
• lapse of 3 minutes
• TH2 > 93˚F
• Tc > 126˚F
Hot start delay
30 sec.
Normal control
Normal control
Normal control
Function and Control