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
Branch Provider (BP) Unit Control SiUS181631EA
68 Functions and Control
6. Branch Provider (BP) Unit Control
6.1 Branch Provider (BP) Unit Command Conversion
1.
∆
D (room thermistor temperature
−
target temperature) signals from BP units are
converted to a capacity up/down signal.
∆
D signals from BP units are used as the capacity up/down signal in frequency commands
(excludes during POWERFUL operation).
2. Processing during POWERFUL operation
(1) When POWERFUL command is received from one or more indoor units
(2) Thermostats are not OFF at the indoor units from which POWERFUL commands are issued
When the above conditions are met, the POWERFUL operation is activated, and the
POWERFUL operation signal is sent to the outdoor unit.
∆
D Signal Capacity up/down signal
0 Thermostat OFF
1
Down
2
3
Keep
4
5
Up
6
7
8
9
10
11
12
13
14
15