Daikin LREQ-BY1 Installation Manual Download

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Installation manual

LREQ5~20B7Y1

Air cooled refrigeration condensing unit

4PW74302-1D – 2016.11

When connected at lateral side (bottom)

Remove the knock hole on the bottom frame and route the piping
under the bottom frame.

CAUTION

• Check that the on-site piping does not come in contact with other

piping, the bottom frame, or side plate of the product.

Precautions for Piping

Perform piping branching with the following conditions kept in mind.

• At the time of branching the liquid piping, use a T-joint or Y-joint

and branch it horizontally. This will prevent an uneven flow of
refrigerant.

• At the time of branching gas piping, use a T-joint and branch it so

that the branched piping will be located above the main piping (see
the illustration below). This will prevent the stay of refrigerant oil in
the indoor unit not in operation.

• Use a Y-joint for the liquid refrigerant branch and have the piping

branch horizontally.

• Use a T-joint for the gas refrigerant branch and connect from the

top of the main piping.

• Make sure that the horizontal portion of the gas piping slants

downward to the outdoor unit (see the illustration above).

• If the outdoor unit is located above, make a trap on the gas pipe at

5 m intervals from outdoor unit. This will ensure the smooth
returning of oil in the piping slanting upward.

7. FIELD WIRING

To electric engineering contractors

• Be sure to install an earth leakage breaker. The product

incorporates inverter equipment. In order to prevent the
malfunctioning of the earth leakage breaker, make sure that the
earth leakage breaker withstands harmonic interference.

• Do not operate the condensing unit until refrigerant piping work is

completed, or otherwise the compressor will malfunction.

• Do not remove any electrical components such as thermistors or

sensors when connecting power supply wires or transmission
wires. The compressor may malfunction if the condensing unit is
operated with such electrical components removed.

CAUTION

• All field wiring and components must be installed by a licensed

electrician and must comply with relevant local and national
regulations.

• Be sure to use a dedicated power circuit. Never use a power supply

shared by another appliance.

• Never install a phase advancing capacitor. As this unit is equipped

with an inverter, installing a phase advancing capacitor will not only
deteriorate power factor improvement effect, but also may cause
capacitor abnormal heating accident due to high-frequency waves.

• Only proceed with wiring work after blocking off all power.
• Always ground wires in accordance with relevant local and national

regulations.

• This machine includes an inverter device. Connect earth and leave

charge to eliminate the impact on other devices by reducing noise
generated from the inverter device and to prevent leaked current
from being charged in the outer hull of the product.

• Do not connect the ground wire to gas pipes, sewage pipes,

lightning rods, or telephone ground wires.

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.

• Be sure to install an earth leakage circuit breaker.

This unit uses an inverter, so install the earth leakage circuit
breaker that be capable of handling high harmonics in order to
prevent malfunctioning of the earth leakage circuit breaker itself.

• Earth leakage circuit breaker which are especially for protecting

ground-faults should be used in conjunction with main switch or
fuse for use with wiring.

• Disconnect the power supply for more than 1 minute, and measure

the voltage at the terminals of main circuit capacitors or electrical
components before servicing. The voltage must be less than
50 V DC before you can touch electrical components. For the
location of the terminals, see the wiring diagram.

• Do not touch electrical components with wet hands.
• Do not leave the unit unattended when the service cover is

removed.

Liquid side shutoff valve

Gas side shutoff valve

Gas side
accessory pipe (1)

Gas side
accessory pipe (2)

Brazing

Liquid side
(field supply)

Gas side
(field supply)

Liquid side
accessory pipe (1)

Liquid side
accessory pipe (2)

Knockout hole