Panasonic PAPAMY1702034CE Service Manual page 34

11.1.3 Connect the Piping
11.1.3.1 Connecting The Piping To
Indoor Unit
Please make flare after inserting flare nut (locate at
joint portion of tube assembly) onto the copper
pipe.
(In case of using long piping)
Connect the piping

Align the center of piping and sufficiently tighten
the flare nut with fingers.

Further tighten the flare nut with torque wrench in
specified torque as stated in the table.
11.1.3.2 Connecting The Piping To
Outdoor Multi
Decide piping length and then cut by using pipe
cutter.
Remove burrs from cut edge.
Make flare after inserting the flare nut (locate at
valve) onto the copper pipe. Align center of piping
to valves and then tighten with torque wrench to
the specified torque as stated in the table.
11.1.4 Air Tightness Test on the Refrigerating System
Before system charged with refrigerant and before the refrigerating system in put into operation, below site test
procedure and acceptance criteria shall be verified by the certified technicians, and/or the installer:-
Step 1: Pressure test for refrigerant leak detection:
1. Steps for pressure test, in accordance to ISO 5149.
2. Evacuate the system from refrigerant before the leak test, attach the gauge manifold set correctly and tightly.
Charging hose of Low side connect to Gas side. (Charging hose of High side connect to Liquid side if
applicable.)
3. Adjust the knob on the service valves, and regulator on the gauge set, so that test gas can be inserted
through the centre manifold of the gauge set.
4. Insert Nitrogen gas into the system through the centre manifold and wait until the pressure within the system
to reach about 1MPa (10 BarG) wait for a few hours and monitor the pressure reading on the gauges.
5. Please note that the system's pressure may rise slightly if the test is carried out on mid day, due to
temperature rise. The inverse may happen when there is temperature drop at night. However, this variation
will be minimal.
6. Waiting time depends on the size of the system. Larger systems may require 12 hours of waiting time. Leak
detection within smaller system can be achieved in 4 hours.
7. Check if there is a constant pressure drop. Move to next step "Step 2: Refrigerant leak detection..." if there is
any pressure drop. Otherwise, release the Nitrogen gas and, move to "Step 3: Evacuation of the equipment".
8. Next, insert a small amount of same refrigerant into the system through the centre hose, until the pressure
reaches about 1MPa (10 BarG).
AIR PURGING METHOD IS PROHIBITED FOR R32 SYSTEM
(Low/Gas) pressure gauge
7
3
4 8
N R-###
2
Do not over tighten, over tightening may cause gas leakage.
Piping size
6.35 mm (1/4")
9.52 mm (3/8")
12.7 mm (1/2")
15.88 mm (5/8")
19.05 mm (3/4")
(High/Liquid) pressure gauge
2
2
An example illustrations of setup for
refrigerant leak detection.
34
Torque
[18 N•m (1.8 kgf•m)]
[42 N•m (4.3 kgf•m)]
[55 N•m (5.6 kgf•m)]
[65 N•m (6.6 kgf•m)]
[100 N•m (10.2 kgf•m)]
Torque
wrench
Spanner
or Wrench