SiUS281117
Outline of Control (Indoor Unit)
58
Function and Control
FTQ
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
start
condition 1
or the
start
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
The fan is ON: ON
The fan is OFF: OFF
Hot start control
Hot start in progress
Normal control
Normal control
Normal control
H/L remote
controller setting
LL
OFF
OFF
ON
OFF
ON
Fa
n
Heater
Humidifier
30 sec.
Hot start delay
Hot start ending conditions
• lapse of 3 minutes
• TH2 > 93˚F
• Tc > 126˚F
OR
OR
Hot start start conditions
· Start condition 1: Defrost ending or
oil return ending
· Start condition 2: Thermostat ON