Daikin VRV III Installation Manual Download Page 19

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R REMQ10~16P8 + REMHQ12P8Y1B

VRVIII System air conditioner

4PW48463-1A

Installation manual

Be sure to install a main switch for the complete system.

8.4.

General cautions

■

Up to 3 units can be connected by crossover power source
wiring between outdoor units. However, units of smaller capacity
must be connected downstream. For details, refer to the
technical data.

■

When connecting several units in VRV combination, the power
supply of each outdoor unit can also be connected separately.
Refer to the field wiring on the engineering data book for further
details.

■

Make sure to connect the power source wire to the power
source terminal block and to clamp it as shown in

figure 19

and

described in chapter

"8.8. Field line connection: power wiring"

on page 16

■

For conditional connections, refer to the Technical Data.

■

As this unit is equipped with an inverter, installing a phase
advancing capacitor not only will deteriorate power factor
improvement effect, but also may cause capacitor abnormal
heating accident due to high-frequency waves. Therefore, never
install a phase advancing capacitor.

■

Keep power imbalance within 2% of the supply rating.
•

Large imbalance will shorten the life of the smoothing
capacitor.

•

As a protective measure, the product will stop operating and
an error indication will be made, when power imbalance
exceeds 4% of the supply rating.

■

Follow the "electrical wiring diagram" supplied with the unit when
carrying out any electrical wiring.

■

Only proceed with wiring work after all power is shut off.

■

Always ground wires. (In accordance with national regulations of
the pertinent country.)

■

Do not connect the ground wire to gas pipes, sewage pipes,
lightning rods or telephone ground wires. This may cause
electric shock.
•

Combustion gas pipes: can explode or catch fire if there is a
gas leak.

•

Sewage pipes: no grounding effect is possible if hard plastic
piping is used.

•

Telephone ground wires and lightning rods: dangerous when
struck by lightning due to abnormal rise in electrical potential
in the grounding.

■

This unit uses an inverter and therefore generates noise, which
will have to be reduced to avoid interfering with other devices.
The outer casing of the product may take on an electrical charge
due to leaked electrical current, which will have to be discharged
with the grounding.

■

Be sure to install an earth leakage breaker. (One that can
handle high-frequency electrical noise.)

(This unit uses an inverter, which means that an earth leakage
breaker capable of handling high-frequency electrical noise
must be used in order to prevent malfunctioning of the earth
leakage breaker itself.)

■

Earth leakage breakers that are especially designed for
protecting ground-faults must be used in conjunction with main
switch and fuse for use with wiring.

■

Never connect the power supply in reversed phase.

The unit can not operate normally in reversed phase. If you
connect in reversed phase, replace two of the three phases.

■

This unit has a reverse phase detection circuit. (If it is activated,
only operate the unit after correcting the wiring.)

■

Power supply wires must be attached securely.

■

If the power supply has a missing or wrong N-phase, equipment
will break down.

■

Make sure that all wiring is secure, the specified wires are used,
and no external forces act on the terminal connection or wires.

■

Improper connections or installation may result in fire.

■

When wiring the power supply and connecting the remote
controller wiring and transmission wiring, position the wires so
that the control box lid can be securely fastened.
Improper positioning of the control box lid may result in electric
shocks, fire or overheating of the terminals.

8.5.

System examples

(See figure 14)

max

(

Ω

)

Minimum
S

value

REYQ18

= REMQ8+REMQ10

0.27