Outline of Control (Indoor Unit)
SiUS28-902_B
34
Function
6.6
Hot Start Control (In Heating Operation Only)
FCQ, FHQ, FAQ
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.
TH
2
: Temperature detected with the gas thermistor
TC: High pressure equivalent saturated temperature
The fan is not OFF before initiating the hot start: LL
The fan is OFF before initiating the hot start: OFF
Hot start control
Hot start in progress
Normal control
Normal control
H/L remote
controller setting
LL
OFF
Remote controller
setting
Po (Horizontal)
Fa
n
Louv
er
Hot start ending conditions
• lapse of 3 minutes
• TH2 > 93˚F
• Tc > 126˚F
OR
Hot start starting conditions
• Starting condition1: Defrost ending or
oil return ending
• Starting condition 2: Thermostat ON
OR
