Test Run. - Panasonic U-4LE1E5 Installation Instructions Manual

Leak test
(1) Attach a manifold valve (with pressure gauges) and dry
nitrogen gas cylinder to this service port with charge
hoses.
CAUTION
Use a manifold valve for air purging. If it is not available,
use a stop valve for this purpose. The "Hi" knob of the
manifold valve must always be kept closed.
(2) Pressurize the system to no more than 3.80 MPa with dry
nitrogen gas and close the cylinder valve when the gauge
reading reaches 3.80 MPa. Then, test for leaks with liquid
soap.
CAUTION
To avoid nitrogen entering the refrigerant system in a
liquid state, the top of the cylinder must be higher than
the bottom when you pressurize the system. Usually, the
cylinder is used in a vertical standing position.
(3) Do a leak test of all joints of the tubing (both indoor and
outdoor) and both gas tube and liquid tube service valves.
Bubbles indicate a leak. Wipe off the soap with a clean
cloth after the leak test.
(4) After the system is found to be free of leaks, relieve the
nitrogen pressure by loosening the charge hose connector
at the nitrogen cylinder. When the system pressure is
reduced to normal, disconnect the hose from the cylinder.
Evacuation
(1) Attach the charge hose end described in the preceding
steps to the vacuum pump to evacuate the tubing and
indoor unit. Confirm that the "Lo" knob of the manifold
valve is open. Then, run the vacuum pump. The operation
time for evacuation varies with the tubing length and
capacity of the pump. The following table shows the
amount of time for evacuation:
Required time for evacuation
when 30 gal/h vacuum pump is used
If tubing length is
less than 15 m
45 min. or more
NOTE
The required time in the above table is calculated based on the
assumption that the ideal (or target) vacuum condition is less
than –101 kPa (–755 mmHg, 5 Torr).
(2) When the desired vacuum is reached, close the "Lo"
knob of the manifold valve and turn off the vacuum pump.
Confirm that the gauge pressure is under –101 kPa
(–755 mmHg, 5 Torr) after 4 to 5 minutes of vacuum pump
operation. (Fig. 6-4)
AMP Air Conditioning
If tubing length is
longer than 15 m
90 min. or more
23
Manifold valve
Lo Hi
Pressure
gauge
Vacuum pump
Open
Gas tube
Open
Liquid tube
CAUTION
Use a cylinder designed for use with R410A respectively.
Charging additional refrigerant
● Charging additional refrigerant (calculated from the liquid
tube length as shown in Section 1-7 "Additional Refrigerant
Charge") using the liquid tube service valve. (Fig. 6-5)
● Use a balance to measure the refrigerant accurately.
● If the additional refrigerant charge amount cannot be
charged at once, charge the remaining refrigerant in liquid
form by using the gas tube service valve with the system in
cooling operation mode at the time of test run. (Fig. 6-6)
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Service port ø7.94 mm
Outdoor unit
Close
Close
Fig. 6-4