SiUS181305E
Function of FFQ Series
Function
86
8.3
Freeze Prevention Control
When the temperature detected by liquid pipe thermistor (R2T) of the indoor heat exchanger drops
too low, the unit enters freeze prevention control in accordance with the following conditions, and is
also set in accordance with the conditions given below.
Conditions for starting: Temperature is –1°C (30.2°F) or less for total of 40 min., or temperature is
–5°C (23°F) or less for total of 10 min.
Conditions for cancelling: Temperature is +7°C (44.6°F) or more for 10 min. continuously
Ex: Case where temperature is –5°C (23°F) or less for total of 10 min.
8.4
Hot Start Control (In Heating Operation Only)
Outline
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
Freeze prevention control
Normal operation
Forced OFF by thermostat
10 min.
– 5˚C
+ 0˚C
+ 7˚C
10 min.
(R18813)
(44.6˚F)
(32˚F)
(23˚F)
TH
2
: Temperature detected by the gas thermistor
Tc: High pressure equivalent saturation temperature
Defrost ending or oil return ending
or Thermostat ON
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 operation
Normal operation
H/L remote
controller setting
LL
OFF
Remote controller
setting
Level position
Fa
n
Louv
er
Hot start ending conditions
·
lapse of 3 minutes
·
TH
2
> 34˚C (93.2˚F)
·
Tc > 52˚C (125.6˚F)
OR
(R19187)
