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•
If tolerances are not met, shim the appropriate points by
inserting a metal spacer between the machine base and
the foundation. The metal spacer size is approximately 50
mm wide by 80 mm long. Prepare spacers with different
thicknesses (0.6 mm to 9 mm).
Spacer position
Fixing of the anchor bolts
a.
Weld the washers to the 16LJ unit base.
b.
Tighten the nuts.
Nut
Weld
1.8 - Leak test and method of charging/removing
nitrogen gas
If the chiller is leaking, please refer to the following items and
Fig. 5.
1.8.1 - Leak test
This describes the chiller leak test procedure, using pressurized
nitrogen gas (N
gas).
2
Equipment to use
•
Nitrogen gas cylinder
•
Pressure regulator
•
Pressure-proof hose
•
Flashlight
•
Soapy water
•
Adjustable wrench
•
Hose band
•
Vacuum gauge (0-1 kPa)
•
Pressure gauge (0-100 kPa)
Requirement to meet
Pressurize the chiller up to 50 kPa with the nitrogen gas. Use a
soapy water solution and check that there are no bubbles at any
of the joints.
10
Fig. 3
Spacer position
Fig. 4
Washer
Machine base
Test sequence
Charge N
gas
Refer to 1..2
2
Perform recheck
Check at 0 kPa
- - - Check leakages
OK Not good
Tighten nuts
Remove N
gas and repair - charge N
2
NOTE: Weld repair can be done after
Remove N
gas
2
removing the N
Air purging
Procedure (see Fig. 5)
1.
Confirm that V1, V2, V3, B-valve, SV1, SV2 are fully
closed.
2.
Confirm that all absorbent and refrigerant pump isolation
valves are fully open.
3.
Connect the vacuum gauge to SV2 and open SV2
-
Charge N
gas (refer to 1.8.2).
2
-
Pressurize the chiller up to 50 kPa with N
pressure inside the chiller can be checked with the
vacuum gauge.
-
When the pressure reaches 50 kPa, close the service
valve and the valve of the N
4.
Check the following positions with the soapy water:
-
All field-welded parts (not needed for one-piece
machine)
-
Sight glass: If any leakage is observed in the sight
glass, tighten the fittings and ensure that there is no
N
gas leak.
2
-
Flare nut joints of service valves.
-
Flange connections (absorbent pumps, refrigerant
pump, etc.)
-
Diaphragm valves.
5.
If any leakage is observed at the welded parts, remove the
N
gas and then repair the leaks.
2
6.
Repeat steps 3 and 4.
7.
If there is no leakage at 50 kPa pressure, keep the chiller
pressurized to 50 kPa for 24 hours, and then check the
pressure again.
8.
After completion of the test, remove the N
vacuum gauge (refer to chapter 1.8.3)
9.
Close SV2.
NOTE: If N
gas is removed, ensure that the room is
2
sufficiently ventilated.
gas up to 0 kPa
2
gas. Refer to 1.8.3
2
gas. The
2
gas cylinder.
2
gas, and the
2
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