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SiUS092230EA
Control Specification
Part 4 Functions and Control
87
5.7 Freeze-up Protection Control
Outline
During cooling operation, the signal sent from the indoor unit determines the frequency upper limit
and prevents freezing of the indoor heat exchanger. The signals from the indoor unit are divided
into zones.
Details
FTXR
The operating frequency limitation is judged with the indoor heat exchanger temperature.
R4003563
FDMQ
When the freeze-up protection control starts, the compressor stops, the airflow rate is fixed to L tap,
and the drain pump turns ON. Conditions for starting and ending are as below.
Starting conditions
The freeze-up protection control starts when any of the following conditions is satisfied.
The indoor heat exchanger temperature remains at
A
or lower for 1 minute.
The accumulated time that the indoor heat exchanger temperature remains at
B
or lower
reaches 40 minutes.
Accumulated timer clearing condition
The indoor heat exchanger temperature remains at
C
or higher for 20 minutes.
Ending condition
The indoor heat exchanger temperature remains at
D
or higher for 10 minutes.
R4003915
(°C)
(°F)
A
–5
23.0
B
–1
30.2
C
4
39.2
D
7
44.6
Reset zone
Up zone
Keep zone
Dropping zone
Stop zone
13°C (55.4°F)
6.5°C (44°F)
5.5°C (41.9°F)
0°C (32°F)
6°C (43°F)
(Reference)
Indoor heat exchanger
temperature (R2T)
D
A
B
C
Indoor heat
exchanger
temperature
The control starts.
The control starts.
The control ends
and the accumulated timer is cleared.
The accumulated timer is cleared.
Summary of Contents for RX-W Series
Page 1: ... Applied Models Inverter Pair Heat Pump Service Manual SiUS092230EA Inverter Pair RX W Series ...
Page 207: ...SiUS092230EA Check Part 6 Service Diagnosis 201 15 18 24 class R25105 1 2 3 4 Multimeter ...
Page 209: ...SiUS092230EA Check Part 6 Service Diagnosis 203 15 18 24 class R20704 W V U DC_P1 DC_N1 ...
Page 239: ...SiUS092230EA Piping Diagrams Part 8 Appendix 233 RX24WMVJU9 3D141502 ...