Inspection And Pipe Insulation; Air Tight Test/Vacuum Drying; Thermal Insulation Work - Daikin CONVENI-PACK Installation Manual

14 Perform wiring carefully so that the sound insulation of the com-
pressor will not come off
15 Support
16 Fixed to the rear side of the support with the provided clamp (2)
17 Fixed to the rear side of the support with the provided clamp (2)
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 CONVENI-
PACK is operated with the shutoff valve closed.

8-1 Air Tight 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 pre-
cisely.
• To ensure that the CONVENI-PACK withstand pressure properly
and prevent the penetration of foreign substances, be sure to use
R410A-dedicated tools.
• To ensure that the CONVENI-PACK with-
stand 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
Vacuum pump while the pump is not in operation.
• Use a vacuum pump that can vacuum
down to –100.7kPa (5 Torr or –755mmHg).
Gas for airtight
• Nitrogen gas
test use
• Air tight
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 pres-
sure). 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
Connect a vacuum pump to the service ports (*) of both the liquid
and gas pipes for at least 2 hours and vacuum the unit down to
–100.7 kPa or below. Then leave the unit for at least 1 hour at a
pressure of –100.7 kPa or below and check that the vacuum gage
reading will not rise. If the pressure rises, there is residual water in
the system or the system has leakage.
*1 Contact the manufacturer in advance for more information about
the design pressure of the indoor unit (field supply).
14
*2 Refer to the instruction label on the front panel of the outdoor unit
(below) for the position of the service port.
Label
Gas side
shoutoff valve
Pressure-reducing valve
Charge
hose
Valve
R410A
Vacuum pump
Meter
Used for refrigerant
replenishment
Note:
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.
In case of possible water intrusion into piping
Perform the above mentioned vacuum drying for 2 hours first in the
following cases:
The product is installed in the rainy season, there is a fear of dew
condensation resulting in the piping because the installation work
period is long, or there is a fear of rainwater intrusion into the piping
for other reasons.
Then impose a pressure of up to 0.05 MPa with nitrogen gas (for
vacuum destruction) and vacuum the unit down to –100.7 kPa or
below for 1 hour with a vacuum pump (for vacuum drying).
Repeat vacuum destruction and vacuum drying if the pressure does
not reach –100.7 kPa or below after a minimum of 2 hours' vacuum-
ing. Leave the vacuum state for 1 hour then, and check that the vac-
uum gauge reading will not rise.

8-2 Thermal Insulation Work

• Be sure to perform thermal insulation of the piping after the air-
tight 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.
• Liquid pipe arrival minimum temperature
20°C (Air-conditioning side)
5°C (Refrigeration side)
Gas pipe arrival minimum temperature
0°C (Air-conditioning side)
–20°C (Refrigeration side)
• Reinforce the insulation material for the refrigerant piping accord-
ing to the environment of thermal installation. Otherwise, the sur-
face of the insulation material may result in dew condensation.
Position of instruction label
Shoutoff valve
service port
Liquid side
shoutoff valve
Outdoor unit
To Refrigeration
indoor unit
To Air-conditioning
indoor unit
Field pipings
English