Si01-406
Control for Heat Pump Models
Functions and Control
45
3.8
Liquid Compression Protection Function 1
(Securing of
Differential Pressure and Blown Air Temperature)
Outline
To secure the reliability of the compressor (for dryness of suction refrigerant and differential
pressure) which is the primary purpose of the compressor, the lower limit of the output
frequency is limited to two stages under the condition of outside air temperature. This time, in
addition to this purpose, this function is adopted also for prevention of cold draught by securing
the blown air temperature at the time of heating operation by low-temperature out side air.
Processing
1. At the first step
���
During operation of compressors.
���
Outdoor temperature
≤
DOA1CG
If
���
and
���
are under the simultaneous condition with AND, the lower limit of frequency in
this function is set at FCG7.
���
Compressors stop.
���
Outdoor temperature
≥
DOA2CG
If
���
and
���
are under the simultaneous condition with OR, the lower limit of frequency at the
first step control is cancelled.
2. At the second step
���
During operation of compressors
���
Outdoor temperature
≤
DOA3CG
If
���
and
���
are under the simultaneous condition with AND, the lower limit of frequency in
this function is set at FCG8.
���
Compressors stop.
���
Outdoor temperature
≥
DOA4CG
If
���
and
���
are under the coordinate condition with OR, the lower limit of frequency at the
second step control is cancelled.
3. The set of a constant
DOA1CG, DOA2CG, DOA3CG, FCG7 and FCG8 have constants for Cooling / Heating
separately and these constants are distinguished with a suffix c/w.
4. Actual constant
∗
DOA : Outdoor air temperature
CGC : Compressor guard for cooling
CGW : Compressor guard for heating
FCG : Frequency guard for compressor protection
∗
Common setting for 25 / 35 class
Cooling
Heating
DOA1CGC
18°C
DOA1CGW
0°C
DOA2CGC
20°C
DOA2CGW
2°C
DOA3CGC
14°C
DOA3CGW
–4°C
DOA4CGC
16°C
DOA4CGW
–2°C
FCG7C
34 Hz
FCG7W
34 Hz
FCG8C
34 Hz
FCG8W
34 Hz
FCG8
The lower
frequency limit.
Cancelled
FCG7
FCG7
Cancelled
DOA3CG
DOA4CG
DOA1CG
DOA2CG
Outdoor temperature
(R1044)
Содержание FT25CV1A
Страница 7: ...Si01 406 vi Table of Contents...
Страница 15: ...Functions Si01 406 4 List of Function...
Страница 21: ...Specifications Si01 406 10 Specifications...
Страница 31: ...Printed Circuit Board Connector Wiring Diagram Si01 406 20 Printed Circuit Board Connector Wiring Diagram...
Страница 189: ...R50 60CV1A Si01 406 178 Removal Procedure 6 Remove the screw 7 Take off the electrical parts box Step Procedure Points...
Страница 205: ...Wiring Diagrams Si01 406 194 Appendix...
Страница 209: ...Si01 406 iv Index...