Specifications
Table Of Contents
- Cover
- Table of Contents
- Part 1 General Information
- Part 2 Specifications
- Part 3 Refrigerant Circuit
- Part 4 Function
- Part 5 Test Operation
- Part 6 Troubleshooting
- Part 7 Appendix
- 1. Piping Diagrams
- 2. Wiring Diagrams for Reference
- 3. List of Electrical and Functional Parts
- 4. Option List
- 5. Piping Installation Point
- 6. Example of connection (R-410A Type)
- 7. Thermistor Resistance / Temperature Characteristics
- 8. Pressure Sensor
- 9. Method of Checking the Inverter’s Power Transistors and Diode Modules
- Part 8 Precautions for New Refrigerant (R-410A)
- Index
- Drawings & Flow Charts
Troubleshooting by Indication on the Remote Controller Si34-704
264 Troubleshooting
3.42
“
UO
”
Outdoor Unit: Gas Shortage Alert
Remote
Controller
Display
U0
Applicable
Models
RXQ5P~54P
Method of
Malfunction
Detection
Detect gas shortage based on the temperature difference between low pressure or suction pipe
and heat exchanger.
Malfunction
Decision
Conditions
[In cooling mode]
Low pressure becomes 0.1MPa or below.
[In heating mode]
The degree of superheat of suction gas becomes 20 degrees and over.
SH= Ts1 –Te
Ts1: Suction pipe temperature detected by thermistor
Te : Saturated temperature corresponding to low pressure
★
Malfunction is not determined. The unit continues operation.
Supposed
Causes
Gas shortage or refrigerant clogging (piping error)
Defective thermistor (R4T, R7T)
Defective low pressure sensor
Defective outdoor unit PCB (A1P)