Panasonic U-8MF1E8 Installation Instructions Manual page 21

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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 If tubing length is
less than 15 m longer than 15 m
45 min. or more 90 min. or more
Evacuation is not necessary for the balance tube if only 1
outdoor unit is installed.
N OT E
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)
Manifold valve
Pressure
Lo Hi
gauge
Vacuum pump
Open
Suction tube
Close
Open
Discharge tube
Close
Outdoor unit
Open
Liquid tube
Close
Open
Balance tube
Close
CAUTION
Use a cylinder designed for use with R410A.
Charging additional refrigerant
● Charging additional refrigerant (calculated from the liquid
tube length as shown in Section 1-8 "Additional Refrigerant
Charge") using the liquid tube service valve. (Fig. 6-5)
● Use a balance or scale 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 suction tube service valve with the system
in Cooling mode at the time of test run. (Fig. 6-6)
● Close the valve on the cylinder containing R410A.
Manifold valve
Pressure
Lo Hi
gauge
Valve
Liquid
R410A
Close
Suction tube
Close
Close
Outdoor unit
Discharge tube
Close
Open
Liquid tube
Close
Close
Balance tube
Close
Open
Suction tube
Open
Close
Discharge tube
Open
Outdoor unit
Close
Fig. 6-4
Liquid tube
Open
Close
Balance tube
Open
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SUPPLEMENT
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Finishing the job
(1) With a flathead screwdriver, turn the liquid tube service
valve counterclockwise to fully open the valve.
(2) Turn the all service valve counterclockwise to fully open
the valve.
(3) Close all stop valves and loosen the "LO" knob of the
manifold valve.
(4) Loosen the charge hose connected to all service port, then
remove the hose.
(5) Replace all valve caps at all service ports and fasten them
securely.
This completes air purging with a vacuum pump. The air
conditioner is now ready for a test run.
Fig. 6-5
Fig. 6-6
7. TEST RUN
7-1. Preparing for Test Run
● Before attempting to start the air conditioner, check the
following.
(1) The control wiring is correctly connected and all electrical
connections are tight.
(2) The transportation pads for the indoor fan have been
removed. If not, remove them now.
(3) The power has been supplied to the unit for at least 5
hours before starting the compressor. The bottom of
the compressor should be warm to the touch and the
crankcase heater around the feet of the compressor should
be hot to the touch. (Fig. 7-1)
ON
(Power must be turned ON at least
5 hours before attempting test run)
Power mains switch
Fig. 7-1
(4) If only 1 outdoor unit is installed, close the service valve on
the balance tubes, and open the service valve on the other
3 tubes (suction, discharge, and liquid tubes).
If 2 or 3 outdoor units are installed, open the service valves
on all 4 tubes (suction, discharge, liquid, and balance
tubes).
Balance tube
Liquid tube
Discharge tube
Suction tube
Fig. 7-2
(5) Request that the customer be present for the test run.
Explain the contents of the instruction manual, and then
have the customer actually operate the system.
(6) Be sure to give the instruction manual and warranty
certificate to the customer.
(7) When replacing the control PCB, be sure to make all the
same settings on the new PCB as were in use before
replacement.
The existing EEPROM is not changed, and is connected to
the new control PCB.
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