Panasonic SDC07 3E5-Serie Installationshandbuch Seite 6

CUTTING AND FLARING
THE PIPING
1. Please cut using pipe cutter and then remove the burrs.
2. Remove the burrs by using reamer. If burrs is not removed, gas leakage
may be caused. Turn the piping end down to avoid the metal powder
entering the pipe.
3. Please make fl are after inserting the fl are nut onto the copper pipes.
Pipe
Reamer
Point down
1. To cut 2. To remove burrs
 
Improper fl aring
Inclined Surface Cracked Uneven
damaged thickness
Drain elbow and hose installation
•
Fix the drain elbow 2 and packing 3 to the bottom of indoor unit,
as shown in below illustration.
•
Use inner diameter 17 mm drain hose in the market.
•
This hose must to be installed in a continuosly downward direction
and in a frost-free environment.
•
Guides this hose's outlet to outdoor only.
•
Do not insert this hose into sewage or drain pipe that may generate
ammonia gas, sulfuric gas, etc.
•
If necessary, use hose clamp to further tighten the hose at drain
hose connector to prevent leakage.
•
Water will drip from this hose, therefore the outlet of this hose must
be installed in an area where the outlet cannot become blocked.
Packing 3
Drain Elbow 2
Pressure Relief Valve Drainage Pipework
•
Connect a drain hose to the pressure relief valve hose outlet.
•
This hose must to be installed in a continuosly downward direction
and in a frost-free environment.
•
Guides this hose's outlet to outdoor only.
•
Do not insert this hose into sewage hose or cleaning hose that may
generate ammonia gas, sulfuric gas, etc.
•
If necessary, use hose clamp to further tighten the hose at drain
hose connector to prevent leakage.
•
Water will drip from this hose, therefore the outlet of this hose must
be installed in an area where the outlet cannot become blocked.
Pressure relief valve
hose outlet
6
Handle
Bar
Bar
Yoke
Core
Red arrow mark
Clamp handle
3. To fl are
When properly fl ared, the internal surface
of the fl are will evenly shine and be of even
thickness. Since the fl are part comes into
contact with the connections, carefully check
the fl are fi nish.
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 verifi ed by the certifi ed 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
0 – 0.5 mm
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
Copper
manifold of the gauge set.
pipe
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:
Vacuum test".
8) Next, insert a small amount of same refrigerant into the system
through the centre hose, until the pressure reaches about 1MPa
(10 BarG).
(Low/Gas)
pressure gauge
7
4
N
2
Step 2: Refrigerant leak detection through Electronic halogen leak
detector and/or ultrasonic leak detector:
1) Use any one of below detector to check leaking.
i) Electronic halogen leak detector.
i-a) Switch on the unit.
i-b) Cover the test area from direct draft.
i-c) Pass the detection probe near test area and wait for
audible and visible signals.
ii) Ultrasonic Leak Detector
ii-a) Make sure the area is quiet.
ii-b) Switch on the ultrasonic leak detector.
ii-c) Move the probe along your air conditioning system to
test for leaks, and mark for repair.
2) Any leak detected at this level shall be repaired and retested,
starting from "Step 1: Pressure test".
NOTE:
- Always recover the refrigerant and Nitrogen gas into recovery
cylinder after completion of a test.
- You must use the detection equipment with Detectable Leak Rate
-6 3
of 10 Pa.m /s or better.
- Do not use refrigerant as test medium for system with total
refrigerant charge more than 5kg.
- Test shall be performed with dry Nitrogen or another non-
fl ammable, non-reactive, dried gas. Oxygen, air or mixtures
containing them shall not be used.
(High/Liquid) pressure gauge
3
2
8
2
R-###
An example illustrations of setup for
refrigerant leak detection.