SiUS281811EA Outline of Control (Indoor Unit)
Part 4 Functions and Control 135
When the indoor unit is FCQ, if the air outlet is set as dual-directional or tri-directional, the starting
conditions will be changed as follows.
Liquid pipe temperature ≤ 1°C (33.8°F) (for total of 15 minutes)
or
Liquid pipe temperature ≤ 0°C (32°F) (for 1 minute continuously)
During freeze-up prevention operation, the airflow rate is fixed to LL.
(The cancelling conditions are same as the standard.)
0ºC
(32°F)
+7ºC
(44.6°F)
10 min.
1 min.
+1ºC
(33.8°F)
t1 t2 t3 t4
+7ºC
(44.6°F)
10 min.
OR
t > 15 minutes
Freeze-up prevention control
Forced OFF by thermostat
Freeze-up prevention control
Forced OFF by thermostat
Liquid pipe
temperature
Start
Cancel
Start
Cancel
Normal operation
Normal operation
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