Change Of Heating Thermo-Off Opening Degree Of The Expansion Valve (So); Heating Start Opening Degree Change (Ci); Low Noise Setting (Db) - Hitachi UTOPIA RAS-4HVRP2E Service Manual

6 Optional functions
RAS-3HVRC2
6.1.3.12 Change of heating Thermo-OFF opening degree of the Expansion Valve (S)
The opening degree of the expansion valve of the heating Thermo-OFF unit can be changed by setting the heating
Thermo-OFF opening degree "S" to "1" or "2" in the function selection.
Setting condition
0
1
2

6.1.3.13 Heating start opening degree change (ci)

By setting the heating start opening degree change "ci" to "1" or "2" in the function selection, the expansion valve
opening degree for heating start can be changed.
Setting condition
0
1
2

6.1.3.14 Low noise setting (db)

By setting the operation noise reduction setting "db" to "1" to "3" in the function selection setting, the operation noise
reduction specification can be set. Unlike the night shift setting, the compressor frequency is set lower than normal for
both cooling and heating regardless of the outdoor air temperature.
In this case, the cooling and heating capacity will be reduced to 80%, 70%, and 60%, respectively.
Press PSW1 and select the setting condition "0" to "9" at the low noise setting "db" to reduce the upper limit compressor
frequency.
Setting condition
0
1
2
3
4
5
6
7
8
9
?
N O T E
By setting this function, the compressor frequency and the outdoor fan motor rotation frequency are forcibly reduced and so the outdoor
unit capacity decreases and the unit operation range is limited.
119 SMGB0136 rev.0 - 07/2021
Not available (default setting)
Indoor Expansion Valve Operating during Heating Thermo-OFF 1
Indoor Expansion Valve Operating during Heating Thermo-OFF 2
Not available (default setting)
Outdoor Expansion Valve Initial Opening for Heating 1
Outdoor Expansion Valve Initial Opening for Heating 2
Compressor frequency limit
Not available (default setting)
80%
70%
60%
80%
70%
60%
80%
70%
60%
Operation mode
Operation mode
Operating noise
(dB targeted value)
Not available (default setting)
Low Noise Setting 1
Low Noise Setting 2
Low Noise Setting 3
Low Noise Setting 1
Low Noise Setting 2
Low Noise Setting 3
Low Noise Setting 1
Low Noise Setting 2
Low Noise Setting 3
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