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2.3.4 - Procedure
•
Switch off the power supply during the work. Make sure
to turn off the circuit breaker (MCBM).
•
Connect the earth wire of the megger to the earth terminal
in the control panel.
•
Measure the insulation resistance of each motor at the
following terminals on the control panel and at the wires
disconnected in chapter 2.3.1.
•
For positions measured with the megger see Fig. 7:
- Absorbent pump (terminals)
- Refrigerant pump (terminals)
- Purge pump (terminals)
•
Record the measured values.
L1
L2
L3
PE
(Main circuit breaker)
MCbM
‚r0
‚S0
‚t0
r1
S1
t1
Filter
X
Y
Z
r
S
t
88
P
U31
V31
W31
51
51
P
r
*
*
*
U3
V3
W3
MP
MP
3 to
3 ~
Purge pump
refrigerant pump
1
:
U1/V1/W1
:
U3/V3/W3
:
U4/V4/W4
Fig. 7
88
r
U11
V11
U21
V21
W21
51
A
*
*
*
*
*
U1
V1
U2
V2
W2
MR
MA
Mr
MA
3 to
3 to
3 ~
3 ~
Absorbent pump
2.4 - Initial control board setting
2.4.1 - Time setting
Refer to the operation and maintenance manual.
2.4.2 - Turn on the backup battery on the control board.
Refer to the operation and maintenance manual.
2.4.3 - Check the control board parameters.
Refer to the checklist, specification drawings and exhibit LI.
2.5 - Damper setting and valve position
2.5.1 - Damper setting
Refer to the specification drawings and exhibit LJ.
2.5.2 - Check valve opening status and switch positions
The position of each valve and switch is different for each
operation mode. Refer to the operation and maintenance
manual.
2.6 - Purging
2.6.1 - Ensure the gas ballast valve is closed before starting
the purge pump.
During operation of the purge pump, the gas ballast valve
should be opened. However if the valve is opened too far, purge
pump oil may spill from the oil charge port.
2.6.2 - Bubble test
Before conducting the bubble test, purge the chiller for at
88
A
least one hour. The gas ballast valve should be closed during
W11
the bubble test. Please refer to the table in the chapter 1.11.1
"Bubble test".
*
W1
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