Daikin HXHD125A7V1B, Installation Manual

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Installation manual
44
HXHD125A7V1B
VRVIII system indoor unit
4PW62584-1A – 11.2010
System overview
1 Stop valve outdoor unit
2 Stop valve indoor unit
3 Brazing point
4 Field piping
Recovery/vacuuming overview for 1 indoor unit maintenance
(R410A circuit connections)
1 Pressure reducing valve
2 Nitrogen
3 Refrigerant R410A tank (siphon system)
4 Measuring instrument
5 Vacuum pump
12. T
ROUBLESHOOTING
This section provides useful information for diagnosing and correcting
certain troubles which may occur in the unit.
This troubleshooting and related corrective actions may only be
carried out by your local installer.
12.1. General guidelines
Before starting the troubleshooting procedure, carry out a thorough
visual inspection of the unit and look for obvious defects such as
loose connections or defective wiring.
When a safety device was activated, stop the unit and find out why
the safety device was activated before resetting it. Under no
circumstances safety devices may be bridged or changed to a value
other than the factory setting. If the cause of the problem can not be
found, call your local dealer
.
If the pressure relief valve is not working correctly and is to be
replaced, always reconnect the flexible hose attached to the pressure
relief valve, to avoid water dripping out of the unit!
12.2. Opening the unit
■
To facilitate access to the air
purge valve, thermal cut-out,
3-way valve, thermistors, field
wiring duct, ..., the top
decoration panel of the unit
can be removed by removing
the 2 screws at the rear and
then unhitch the panel. Both
the drain plates can be
removed.
■
To gain access to the indoor
unit at the front side, the total
switch box can be removed
from the unit.
1 To remove the front decoration
panel, remove the 2 bottom
screws and then unhitch the
panel.
2 Loosen the front screws and unhitch the total switch box.
The switch box can now be placed just before the indoor unit.
The compressor cable located at the backside of the unit can be
untied to place the switch box further away from the unit.
WARNING
When carrying out an inspection on the switch box of the
unit, always make sure that the main switch of the unit is
switched off.
1
2
3
3
4
VAC
U
1
2
3
4 5
Switch off all power supply – also outdoor unit power
supply, etc., ... – before removing the switch box
service cover.
CAUTION
■
Make sure to always fix the cover with the screws
when removing the switch box.
■
Parts inside the unit can be hot and burning is
possible.
■
Make sure to switch off all power supplies before
removing the switch box from the unit.
4x
2x
2x
4x
MAX.
15 cm
3
5
1
1
2
2
1
1
4