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–89–
3) Checkpoints and measures to be taken
(a) Measures against noise
Check the items below when noise can be confirmed on wave shape or the error code in the item 1) is generated.
Items to be checked
Measures to be taken
(b) If the wave of the transmission wave is low, 6607 error has occurred, or “HO” is displayed on the remote controller.
Items to be checked
Measures to be taken
1
Wiring of transmission and power lines in
crossing.
2
Wiring of transmission line with that of other
system in bundle.
3
Use of shield wire for transmission line (for
both indoor unit control and centralized
control).
4
The shield is to be daisy-chained in exactly the
same way as the transmission line.
5
Are the units and transmission lines grounded
as instructed in the INSTALLATION MANUAL?
6
Earthing of the shield of transmission line (for
indoor unit control) to outdoor unit.
7
Arrangement for the shield of transmission line
(for centralized control).
Isolate transmission line from power line (5cm or more).
Never put them in the same conduit.
Wire transmission line isolating from other transmission line.
Wiring in bundle may cause erroneous operation like crosstalk.
Use specified transmission wire.
Type
:
Shield line CVVS/CPEVS
Wire diameter
:
1.25mm
2
or more
The transmission line is wired with 2-mumper system. Wire the shield
with jumper system in the same way for transmission line.
When the jumper wiring is not applied to the shield, the effect against
noise will be reduced.
Connect to ground as shown in the INSTALLATION MANUAL.
One-point earthing should be made at outdoor unit.
Without earthing, transmission signal may be changed as the noise on
the transmission line has no way to escape.
For the shield earth of the transmission line for centralized control, the
effect of noise can be minimized if it is from one of the outdoor units in
case of the group operation with different refrigerant systems, and from
the upper rank controller in case the upper rank controller is used.
However, the environment against noise such as the distance of trans-
mission line, the number of connecting sets, the type of connecting con-
troller, and the place of installation, is different for the wiring for central-
ized control. Therefore, the state of the work should be checked as fol-
lows:
a)
No earthing
• Group operation with different refrigerant systems
One-point earthing at outdoor unit
• Upper-rank controller is used
Earthing at the upper-rank controller
b)
Errors occur even though one-point earth is being connected.
Earth shield at all outdoor units.
Provide grounding as shown in the user’s manual.
Chec
k f
or ear
thing
Chec
king f
or wir
ing method
8
The farthest distance of transmission line.
9
The types of transmission lines.
0
Transmission power (30V) supplied to the
idoor unit or the remote control.
A
Faulty indoor unit/remote controller.
Confirm that the farthest distance from outdoor unit to indoor unit/
remote controller is less than 200m.
Use the transmission wire specified.
Type of transmission line
:
Shield wire CVVS/CPEVS
Wire dia. of transmission line
:
1.25mm
2
or larger
Refer to “Transmission Power Supply (30V) Circuit Check Procedure.”
Replace outdoor unit circuit board or remote controller.
Содержание City Multi P500YEM-A
Страница 14: ...13 CNFAN CNPOW CNFC2 CN15V1 CNDR1 CNIPM1 CNE CNDC1 FANCON board G A board...
Страница 15: ...14 Y C board SNB board...
Страница 16: ...15 BC controller CNTR CN02 M NET transmission CN03 CN12 Power supply 1 EARTH 3 N 5 L SW4 SW2 SW1 SW5...
Страница 17: ...16 RELAY 10 board RELAY 4 board...
Страница 70: ...69 1 3 2 4 CV5b CV7b SV7 SV8 Solenoid Valves Block 2 CV4b CV6b CV2b ST1 BV1 BV2 CV3b 1 2 3 4...
Страница 72: ...71 Check Valves Block2 1 3 5 7 6 4 2 CV5b CV4b CV6b CV2b ST1 BV1 BV2 CV3b Check Valves Block2 1 3 7 2 4 5 6...