Field Wiring - Daikin LREQ-BY1 Installation Manual

When connected at lateral side (bottom)
Remove the knock hole on the bottom frame and route the piping
under the bottom frame.
LREQ5~12
Gas side shutoff valve
Brazing
Gas side
accessory pipe (2)
Brazing
Liquid side
accessory pipe (1)
Liquid side
(field supply)
Gas side
(field supply)
Gas side
accessory pipe (1)
LREQ15, LREQ20
Liquid side
shutoff valve
Brazing
Liquid side
accessory pipe (2)
Brazing
Gas side
accessory pipe (1)
Gas side
(field supply)
Liquid side
(field supply)
Liquid side
accessory pipe (1)
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.
Y-joint
A
• Use a T-joint for the gas refrigerant branch and connect from the
top of the main piping.
T-joint
Main piping
Installation manual
11
Liquid side shutoff valve
Brazing
Liquid side
accessory pipe (2)
Knockout hole
Punch the knock hole.
Brazing
Gas side
shutoff valve
Brazing
Gas side
accessory pipe (2)
Knockout hole
Punch the knock hole.
Brazing
Horizontal
surface
±30° or less
A-arrow view
T-joint
Branch piping
Make the piping
slant downward
• 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.
Indoor unit side
Branch piping
Make the piping
slant downward
Main piping
Make the piping
slant downward
Outdoor unit side
LREQ5~20B7Y1
Air cooled refrigeration condensing unit
4PW74302-1D – 2016.11