Daikin RR71B8V3B, Installation Manual

Page: 13 / 18

RR+RQ71+10 RR+RQ7 RR+RQ71~12
RR+RQ71B2W1B
Split System air conditioners
4PW23689-1C Installation manual
10
Precaution for pumping-down operation
The outdoor unit is equipped with a low-pressure switch to protect the
compressor.
Take the following steps to perform the pumping-down operation.
This is the end of pumping-down operation. After pumping-down
operation, the remote controller can show the following:
- "U4"
- blank screen
- indoor fan operates for about 30 seconds
Even when the ON button on the remote controller is pressed, it will
not operate. Turn off the main power supply switch and turn it on
again in need of operation.
E
LECTRICAL WIRING WORK
Precautions on electrical wiring work
■
Before obtaining access to terminal devices, all supply circuits
must be interrupted.
■
Use only copper wires.
■
The wiring between the indoor unit and outdoor unit must be for
230 V.
■
Do not turn on the main switch until all the wiring is completed.
Make sure that the main switch has a contact separation of at
least 3 mm in all poles.
■
For W1
Make sure to connect power supply cables in normal phase. If
connected in reverse phase, the remote controller of the indoor
unit indicates "U1" and the equipment cannot operate. Change
any two of the three power supply cables (L1, L2, L3) to correct
phase.
If the contact in the magnetic switch should be forcibly turned on
while the equipment is inoperative, the compressor will burn out.
Never try to forcibly turn on the contact.
■
Never squeeze bundled cables into a unit.
■
Fix cables so that cables do not make contact with the pipes
(especially on high pressure side).
■
Secure the electrical wiring with clamping material as shown in
the figure below so that it does not come in contact with the
piping, particulary on the high-pressure side.
Make sure no external pressure is applied to the terminal
connectors.
Secure the wiring in the order shown below.
1 Secure the ground wire to the shut-off valve attachment plate so
that it does not slide.
2 Secure the ground wire to the shut-off valve attachment plate
one more time along with the electric wiring and the inter-unit
wiring.
■
Lay the electrical wiring so that the front cover does not rise up
when doing wiring work and attach the front cover securely.
NOTE
Never short-circuit the low pressure switch in this
operation.
Procedure Precaution
1 Put a pressure gauge at the
service port of the gas stop
valve. Use a pressure gauge
reserved for R410A
exclusively.
2
Start the fan operation with the
remote controller. Confirm that stop valves both
on the liquid and gas side are
open.
3 Push the pumping-down
button on the PC board of the
outdoor unit. Compressor and outdoor fan
will start operation
automatically.
If step 3 is performed before
step 2, then the indoor fan
may automatically start
running. Please pay attention
to this.
4 Continue operation for
2 minutes until operation
condition stabilizes. —
5 Close the stop valve on the
liquid side securely. (See
"How
to use the shut-off valve" on
page 6
)
Insecure closing of the valve
may result in burning of the
compressor.
6
When the low-pressure switch
is activated, the unit stops
working. At this time, close the
stop valve on the gas side. —
■
All wiring must be performed by an authorized
electrician.
■
All components procured on the site and all electric
construction should comply with the applicable local
and national codes.
■
High voltage
To avoid electrical shock, make sure to disconnect the
power supply 1 minute or more before servicing the
electrical parts. Even after 1 minute, always measure
the voltage at the terminals of main circuit capacitors
or electrical parts and, before touching, make sure
that those voltages are 50 V DC or less.
NOTE To persons in charge of electrical wiring work:
Do not operate the unit until the refrigerant piping is
complete. (Running it before the piping is ready will break
the compressor.)
1 Switch box
2 Stop valve mounting plate
3 Ground
4 Power supply and ground wiring
5 Wiring between units
6 Tie-wrap
1
5
4
6
2
3
V3-type W1-type