
SiE25-110 Function Details
Function and Operation 85
4.2.9 Compressor step control
Compressor operation frequency is controlled with the following steps in order to make
evaporating temperature constant when cooling and make condensing temperature constant
when heating.
The target temperature of evaporation (Tes) in cooling varies within the range of 2˚C ≤ Tes ≤
20˚C in accordance with ∆Trs and indoor air conditioning load.
The target temperature of condensation (Tcs) also varies within the range of 42˚C ≤ Tcs ≤
51˚C.
4.2.10 Motorized valve PI control
When cooling/heating, PI control of motorized valve is conducted to make heat exchanger outlet
superheat degree (SH) constant in order to utilize outdoor unit heat exchanger (evaporator)
fully.
SH=R4T-Te Te: Low pressure equivalent saturation temperature (˚C)
R4T: Suction pipe temperature (˚C)
[When slight wet operation]
Target heat exchanger outlet superheat degree > Heat exchanger outlet superheat degree
→Motorized valve closes
[When slight overheat operation]
Target heat exchanger outlet superheat degree < Heat exchanger outlet superheat degree
→Motorized valve opens
The initial value of target heat exchanger outlet superheat degree is 5˚C, however, it varies
depending on change of discharge pipe superheat degree of inverter compressor, etc.
Step No.
Compressor operation frequency
Model RZP71D Model RZP100 ~ 140D
1 41Hz 52Hz
2 45Hz 57Hz
3 48Hz 62Hz
4 53Hz 68Hz
5 58Hz 74Hz
6 63Hz 81Hz
7 68Hz 88Hz
8 74Hz 96Hz
9 81Hz 104Hz
10 88Hz 110Hz
11 96Hz 116Hz
12 104Hz 124Hz
13 113Hz 133Hz
14 123Hz 143Hz
15 134Hz 158Hz
16 145Hz(upper limit when heating) 165Hz(upper limit when cooling)
17 156Hz 177Hz(upper limit when heating: RZP100,
125D)
18 172Hz(upper limit when cooling) 189Hz
19 — 202Hz(upper limit when heating: RZP140D)
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