Daikin VRV IV+, Руководство по обслуживанию

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4 | Third party components
Service manual
358
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
To check F1-F2 transmission
To check the F1-F2 wiring
1 Check that the wiring:
- is within installation length limits,
- is of the proper wire type,
- is of the proper wire thickness,
- is properly fixed to the terminals,
- is executed according to the installation manual, with no star connections.
2 Check that no shielded cables are used or that shielded cables are grounded
only on one side of the cable.
3 Check that F1-F2 wiring has continuity all over.
Is the wiring correctly executed, as
indicated in the installation manual? Action
Yes Continue with the next step in this
checking procedure.
No Modify the wiring, see the installation
manual.
To measure the F1-F2 transmission
F1-F2 transmission is a D3Net rectangular waveform, 16 VDC ± 5 V with 16-5V
amplitude that appears on the 16V base line:
5 V
16 V
F1-F2 terminals on indoor units, branch selector boxes, outdoor units and central
controllers are all possible measurement points. Use as many points as you can and
take the time necessary for measurement if analyzing with an oscilloscope.
On outdoor units, measurement should be done either at F1-F2 IN or F1-F2 OUT. If
the F1-F2 OUT terminal is not used, then measure at the F1-F2 IN terminal.
You can conduct the measuring with a multimeter or an oscilloscope.
To measure the F1-F2 transmission with a multimeter:
4 Set the multimeter to DC Voltage measurement.
5 Measure on the F1 and F2 terminals.
Result: 16 V DC should be read.
To measure the F1-F2 transmission with an oscilloscope:
INFORMATION
Ensure that probes are securely connected to F1-F2 terminals. Otherwise, distortions
will be generated resulting in misinterpretation of data. It is recommended to
connect temporary cables to the probes and then connect the cables to the
terminals securely.
6 Measure at as many points as you can, this can help to determinate the
problem.