Part 3 - Ins
talla
tion and Field Se
ttings
DC Inverter Chiller
57
6
Commissioning and Maintenance
6.1 Commissioning
6.1.1
Preparation
After the water system pipeline is flushed several times, please make sure that the purity of water meets the
requirements; the system is re-filled with water and drained, and the pump is started up, then make sure that water
flow and the pressure at the outlet meet the requirements.
The unit is connected to the main power 12 hours before being started up, to supply power to the heating belt and
pre-heat the compressor. Inadequate pre-heating may cause damages to the compressor.
Setting of the wired controller. See details of the manual concerning setting contents of the controller, including such
basic settings as refrigerating and heating mode, manual adjustment and automatic adjustment mode and pump
mode. Under normal circumstances, the parameters are set around standard operating conditions for trial run, and
extreme working conditions should be prevented as much as possible.
Carefully adjust the water flow switch on the water system or the inlet stop valve of the unit, to make the water flow
of the system accord with the water flow in specification table.
6.1.2 Test run
Start up the controller and check whether the unit displays a fault code. If a fault occurs, remove the fault first, and
start the unit according to the operating method in the "unit control instruction", after determining that there is no
fault existing in the unit.
Conduct trial run for 30 min. When the influent and effluent temperature becomes stabilized, adjust the water flow
to nominal value, to ensure normal operation of the unit.
After the unit is shut down, it should be put into operation 10 min later, to avoid frequent start-up of the unit. In the
end, check whether the unit meets the requirements in specification table.
6.1.3
Notices
The unit can control start-up and shut-down of the unit, so when the water system is flushed, the operation of the
pump should not be controlled by the unit.
Do not start up the unit before draining the water system completely.
The water flow switch must be installed correctly. The wires of the water flow switch must be connected according
to electric control schematic diagram, or the faults caused by water breaking while the unit is in operation should be
the user’s responsibility.
Do not re-start the unit within 10 min after the unit is shut down during trial run.
When the unit is used frequently, do not cut off the power supply after the unit is shut down; otherwise the
compressor cannot be heated, thus leading to its damages.
If the unit is not in service for a long time, and the power supply needs to be cut off, the unit should be connected
to the power supply 12 hours prior to re-starting of the unit, to pre-heat the compressor.
6.2 Maintenance
6.2.1 Maintenance for main components
Close attention should be paid to the discharge and suction pressure during the running process. Find out reasons
and eliminate the failure if abnormality is found.
Control and protect the equipment. See to it that no random adjustment be made on the set points on site.
Regularly check whether the electric connection is loose, and whether there is bad contact at the contact point
caused by oxidation and debris etc., and take timely measures if necessary. Frequently check the work voltage,
current and phase balance.
Check the reliability of the electric elements in time. Ineffective and unreliable elements should be replaced in time.
