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1.9 - Piping
1.9.1 - Connect each pipe according to exhibit LE and the
specification drawings.
•
Make all necessary connections to the building chilled and
cooling water systems. Ensure that all piping is adequately
supported and that no strain is placed on the chiller
nozzles and connecting flanges.
•
Provide adequate temperature and pressure sockets or taps
on all supply and return piping.
1.9.2 - Flushing
All water system pipes must be flushed before the water is
circulated in the chiller.
1.10 - Field wiring
CE marking
Power supply connections should be in accordance with CE
and comply with overvoltage category III (IEC 60664). All
other connections should be in accordance with overvoltage
category II. All wiring must be in accordance with CE
requirements.
•
Refer to exhibit LF and the specification drawings for
wiring connections.
•
Supply power to the hot water control valve and hot water
shut-off valve.
•
Refer to chapter 2.3 - Electrical check.
•
A properly qualified electrician should carry out the
electrical wiring.
1.11 - Purging (see Fig. 5)
•
Ensure that the power supply is continuous.
•
Remove nitrogen gas (refer to chapter 1.8.3.)
•
Fill the purge oil pump to the centre of the red mark of
purge pump level gauge.
•
Turn on the control panel main breaker and the purge
pump switch. Check the direction of rotation. If the
direction is wrong, turn off the power supply to the chiller.
•
Then change any two of the wires of main power supply
source. The chiller was connected with all wires meeting
the same phase. Run the purge pump continuously.
•
Connect the vacuum gauge (1 kPa) to SV2.
-
Open SV2.
-
Open V1, V3, and B-valve to purge the chiller.
-
After one hour open V2.
•
Operate the purge pump until the vacuum gauge shows 0.5
kPa. Refer to the following table.
16LJ
11-14
21-32
41-53
12
Time
5 hours
12 hours
24 hours
1.11.1 - Carry out a bubble test (refer to Fig. 6)
Equipment to use
•
Purge pump exhaust attachment
•
Graduated cylinder
•
Vinyl hose (ø 6 mm)
•
Bucket
•
Putty
•
Stop watch
•
Vacuum gauge (0 to 1 kPa)
Required purge rate
16LJ
11
12
13
14
21
22
23
24
31
32
41
42
51
52
53
Note: 1 ml is 1 cm
3
Procedure
•
Purge the air from the chiller until the internal pressure
in the chiller reaches required degree of vacuum, then
continue purging for at least one hour.
•
Connect the vacuum gauge to SV2, and open SV2.
•
Make sure that the attained purge pump vacuum is below
0.5 kPa.
•
Remove the exhaust port cap of the purge pump, and
install the attachment to the exhaust port. Fit a vinyl hose
to the attachment as shown in Fig. 5 and Fig. 7.
•
Open V1, close V2 and V3.
•
Continue operating the purge pump for one minute under
the conditions above. Then measure the volume of bubbles
(the measured volume is called A ml). Do not submerge
the vinyl hose more than 10 mm during this measurement.
If bubbles collect, inspect and tighten the connections
downstream of V2 and V3. If bubbles still appear after
tightening, measure the volume collected for 10 minutes.
•
Open V1 and V3. Close V2. The gas ballast valve and the
oil delivery valve should be closed.
•
Continue operating the purge pump under the conditions
above. Measure the volume of bubbles for 10 minutes
(the measured volume is called B ml). The measurement
should be repeated at least three times. During these
measurements the attained purge pump vacuum should be
kept below 0.5 kPa.
•
B ml - A ml is the result of the bubble test.
•
After the bubble test, the gas ballast valve should be
opened. The oil delivery valve should be opened to check
if any water is contained in the purge pump oil. If water is
observed, drain the water and charge with new oil.
Standard value
ml per 10 min
< 15
< 15
< 15
< 15
< 25
< 25
< 25
< 30
< 30
< 30
< 40
< 40
< 45
< 45
< 50
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