Air Purging - Panasonic U-4LE1E5 Installation Instructions Manual

If the exterior of the outdoor unit valves
has been finished with a square duct
CAUTION covering, make sure you allow sufficient
space to use the valves and to allow the
panels to be attached and removed.
Taping the fl are nuts
Wind the white insulation tape around the flare nuts at the gas
tube connections. Then cover up the tubing connections with
the flare insulator, and fill the gap at the union with the supplied
black insulation tape. Finally, fasten the insulator at both ends
with the supplied vinyl clamps. (Fig. 5-8)
Sealer (supplied) Insulation tape (white)
Unit side
insulator
Flare nut
Insulation material
The material used for insulation must have good insulation
characteristics, be easy to use, be age resistant, and must not
easily absorb moisture.
After a tube has been insulated, never try
to bend it into a narrow curve because it
CAUTION
can cause the tube to break or crack.
Refrigerant tubing and insulator (not supplied)
Drain pipe and insulator (not supplied)
Drain insulator
and clamp. Large
(supplied)
Packing clamp.
Small hose band
(supplied)
Never grasp the drain or refrigerant connecting outlets
when moving the unit.
5-4. Taping the Tubes
(1) At this time, the refrigerant tubes (and electrical wiring
if local codes permit) should be taped together with
armoring tape in 1 bundle. To prevent condensation from
overflowing the drain pan, keep the drain hose separate
from the refrigerant tubing.
(2) Wrap the armoring tape from the bottom of the outdoor
unit to the top of the tubing where it enters the wall. As you
wrap the tubing, overlap half of each previous tape turn.
(3) Clamp the tubing bundle to the wall, using 1 clamp approx.
each meter. (Fig. 5-10)
NOTE
Do not wind the armoring tape too tightly since this will
decrease the heat insulation effect. Also ensure that the
condensation drain hose splits away from the bundle and drips
clear of the unit and the tubing.
AMP Air Conditioning
(supplied)
Flare insulator (supplied)
Tube insulator
(not supplied)
Heat resistant
120°C or above
Vinyl clamps (supplied)
Fig. 5-8
Insulation tape
Vinyl clamp
Flare insulator
Seal
The procedure used for
installing the insulator
for both gas and liquid
tubes is the same.
Fig. 5-9
Clamp
Insulated tubes Drain hose
Fig. 5-10
5-5. Finishing the Installation
After finishing insulating and taping
over the tubing, use sealing putty to
seal off the hole in the wall to prevent
rain and draft from entering. (Fig. 5-11)

6. AIR PURGING

Air and moisture in the refrigerant
system may have undesirable effects
as indicated below.
●
pressure in the system rises
●
operating current rises
●
cooling (or heating) efficiency drops
●
moisture in the refrigerant circuit may
freeze and block capillary tubing
●
water may lead to corrosion of parts
in the refrigerant system
Therefore, the indoor unit and tubing
between the indoor and outdoor unit
must be leak tested and evacuated
to remove any noncondensables and
moisture from the system.
(Figs. 6-1 and 6-2)
■ Air Purging with a Vacuum Pump (for Test Run)
Preparation
Check that each tube (both liquid and gas tubes) between the
indoor and outdoor units has been properly connected and all
wiring for the test run has been completed. Remove the valve
caps from both the gas tube and liquid tube service valves on
the outdoor unit. Note that both liquid and gas tube service
valves on the outdoor unit are kept closed at this stage.
(Fig. 6-3)
Manifold valve
Pressure
Lo Hi
gauge
Cylinder
valve
Open
Gas tube
Open
Liquid tube
22
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Apply putty here
Tubing
Fig. 5-11
Manifold gauge
Fig. 6-1
Vacuum pump
Outlet
Inlet
Fig. 6-2
Charge hose
Nitrogen gas cylinder
(In vertical standing
position)
Service port ø7.94 mm
Close
Outdoor unit
Close
Fig. 6-3