Service Manual
Table Of Contents
- Cover
- Table of contents
- Part 1 List of Functions
- Part 2 Specifications
- Part 3 Printed Circuit Board Connector Wiring Diagram
- Part 4 Refrigerant Circuit
- Part 5 Functions and Control
- Part 6 Test Operation and Field Settings
- Part 7 Remote Controller
- Part 8 Troubleshooting
- 1. Troubleshooting with LED
- 2. Service Diagnosis
- 3. Error Codes and Description
- 4. Troubleshooting for CTXG, CTXS, FTXS, CDXS, FDXS, FVXS Series
- 5. Troubleshooting for FFQ Series
- 6. Troubleshooting for Branch Provider (BP) Unit
- 7. Troubleshooting for Outdoor Unit
- 8. Thermistor Resistance/Temperature Characteristics
- 9. Pressure Sensor
- 10. Method of Replacing Inverter’s Power Transistors Modules
- Part 9 Appendix
SiUS181631EA Basic Control
Functions and Control 55
2.4 Cooling Operation Fan Control
In cooling operation with low outdoor temperature, cooling operation fan control provides the
adequate amount of circulating air with liquid pressure secured by high pressure control using the
outdoor fan.
When the outdoor temperature is
≥
20°C (68°F), the fan operates in STEP 7 or higher.
When the outdoor temperature is
≥
18°C (64.4°F), it operates in STEP 5 or higher.
When the outdoor temperature is
≥
12°C (53.6°F), it operates in STEP 1 or higher.
Fan Steps
Cooling
STEP 0
STEP 1
STEP 2
STEP 3
STEP 4
STEP 5
STEP 6
STEP 7
STEP 8
M1F
0 rpm
250 rpm
400 rpm
285 rpm
360 rpm
445 rpm
580 rpm
715 rpm
850 rpm
M2F
0 rpm
0 rpm
0 rpm
250 rpm
325 rpm
410 rpm
545 rpm
680 rpm
815 rpm
Upper limit of outdoor
fan speed: STEP 8
Upper limit of outdoor
fan speed: STEP 7
–1 step on
outdoor fan
+1 step on
outdoor fan
Pc
<
2.75 MPa (920 ftAq)
PI control
Pc
>
3.24 MPa (1084 ftAq)
Lapse of 20 sec.
PI control
PI control
Lapse of 20 sec.
Hold the
current step on
outdoor fan
Pc: High pressure sensor detection value
(R19078)