Inspection And Pipe Insulation; Airtight Test/Vacuum Drying; Thermal Insulation Work - Daikin LREQ-BY1 Installation Manual

1 Conduit
2 Perform wiring carefully so that the wiring will not come in contact
with the port and part.
3 When routing high-voltage wiring (power supply wiring, earth
wires, and warning/caution/run input, operation output wiring)
from the left side
4 Connecting local piping
5 Power supply terminal block (X1M)
6 X2M terminal block for warning, caution, run input, and operation
output
7 Earth terminal block
8 When routing high-voltage wiring (power supply wiring, earth
wires, and warning/caution/run input, operation output wiring)
from the right side
9 When routing high-voltage wiring (power supply wiring, earth
wires, and warning/caution/run input, operation output wiring)
from the front
10 When routing remote operating switch wiring from the front.
11 Remote switch terminal block (X3M)
12 When routing remote switch wiring through a wiring opening
13 Separate by at least 50 mm
14 Fixed to the rear side of the support with the provided clamp (2)
15 Perform wiring carefully so that the sound insulation of the
compressor will not come off
16 Support
CAUTION
On completion of electrical work, check that there are no disconnected
connectors or terminals of any electrical parts in the control box.
8.

INSPECTION AND PIPE INSULATION

For piping work contractor, electrical work contractor,
and trial run workers
• Never open the shutoff valve until the insulation measurement of
the main power supply circuit is finished. The measured insulation
value will become lower if the measurement is made with the
shutoff valve opened.
• On completion of inspection and refrigerant charging, open the
shutoff valve. The compressor will malfunction if the condensing
unit is operated with the shutoff valve closed.

8-1 Airtight test/vacuum drying

Refrigerant is enclosed in the unit.
Be sure to keep both liquid and gas shutoff valves
closed at the time of an airtight test or vacuum drying of
the local piping.
[For piping work contractor]
On completion of piping work, make the following inspection precisely.
• To ensure that the condensing unit withstand pressure properly
and prevent the penetration of foreign substances, be sure to use
R410A-dedicated tools.
• To ensure that the condensing unit withstand
pressure properly and prevent the
penetration of foreign substances (water,
Gauge manifold dirt, and dust), use an R410A-dedicated
Charge hose gage manifold and charge hose.
R410A-dedicated tools and
R407C-dedicated tools are different in screw
specification.
• Pay the utmost attention so that the pump oil
will not flow backward into the system while
Vacuum pump the pump is not in operation.
• Use a vacuum pump that can vacuum down
to –100.7kPa (5 Torr or –755 mmHg).
Gas for airtight
• Nitrogen gas
test use
Installation manual
15
• Airtight
Pressurize the high-pressure section of the system (liquid piping)
to 3.8 MPa (38 bar) and the low-pressure section of the system
(gas piping) to the design pressure (*1) of the indoor unit (field
supply) from the service port (*2) (do not exceed the design
pressure). The system is considered to have passed if there is no
decrease in the pressure over a period of 24 hours.
If there is a decrease in the pressure, check for and repair leaks.
• Vacuum drying
Operate the vacuum pump for more than three hours from the
service port of both the liquid pipe and the gas pipe (*2) to evacuate
to –100.7 kPa or less. After that, (1) pressurize the outdoor unit
with nitrogen gas to 0.2 MPa or more, and after leaving the outdoor
unit for 10 minutes, (2) operate the vacuum pump for more than
one hour to evacuate to –100.7 kPa or less. (Repeat the steps (1)
and (2) three or more times.)
After the operations are completed, leave the outdoor unit for one
hour and then check that the reading on the vacuum gauge is not
rising. (If the reading on the vacuum gauge is rising, water may be
remaining in the system or leakage may be occurring. In that case,
perform necessary repair and then conduct the air-tightness test
again.)
*1The design pressure of the indoor unit (locally procured) needs to be
2.5 MPa or more. Contact the manufacturer in advance for
information on the design pressure.
*2 Refer to the instruction label on the front panel of the outdoor unit
(below) for the position of the service port.
Position of instruction label
Label
Gas side shutoff valve
Pressure-reducing valve
R410A
Meter
Used for refrigerant
replenishment
Connection procedure for gauge
manifold and vacuum pump
CAUTION
• Conduct an airtight test and vacuum drying precisely through the
service ports of both liquid and gas shutoff valves.
• Use charge hoses (provided with a pushing rod each) when using
the service ports.

8-2 Thermal insulation work

• Be sure to perform thermal insulation of the piping after the airtight
test and vacuum drying.
• Be sure to perform the thermal insulation of the liquid and gas
pipes in the connecting piping. Otherwise, water leakage may
result.
• Be sure to insulate liquid and gas connection piping. Failure to do
so may result in water leakage. Consult the following chart as a
general guide when selecting the insulation thickness.
Shutoff valve
service port
Liquid side
Charge
shutoff valve
hose
Valve
Outdoor unit
To indoor
unit
Vacuum pump
Note: Field pipings
LREQ5~20B7Y1
Air cooled refrigeration condensing unit
4PW74302-1D – 2016.11