DX type water-cooled screw chiller (PCB Control) MCAC-CTSM-2014-03
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Ⅰ. Safety precautions
Before use, read through the operating instructions to ensure proper using. Please keep it well so that
the professional technician can refer to it anytime.
1. Installation safety considerations
Access to the unit must be reserved to authorized personnel, qualified and trained in monitoring and
maintenance. The access limitation device must be installed by the customer (e.g. cut-off, enclosure).
After the unit has been received, when it is ready to be installed or reinstalled, and before it is started up,
it must be inspected for damage. Check that the refrigerant circuit(s) is (are) intact, especially that no
components or pipes have shifted (e.g. following a shock). If in doubt, carry out a leak tightness check
and verify with the manufacturer that the circuit integrity has not been impaired. If damage is detected
upon receipt, immediately file a claim with the shipping company. Midea strongly recommends
employing a specialized company to unload the machine.
It is compulsory to wear personal protection equipment. Do not remove the skid or the packaging until
the unit is in its final position. These units can be moved with a fork lift truck, as long as the forks are
positioned in the right place and direction on the unit.
The units can also be lifted with slings, using only the designated lifting points marked on the unit. Use
slings with the correct capacity, and always follow the lifting instructions on the certified drawings
supplied with the unit. Safety is only guaranteed, if these instructions are carefully followed. If this is not
the case, there is a risk of material deterioration and injuries to personnel. Never cover any safety
devices. This applies to the relief valve(s) in the refrigerant circuit(s). Ensure that the valves are correctly
installed, before operating the unit.
The relief valves are designed and installed to ensure protection against overpressure caused by fire.
The relief valve must only be removed if the fire risk is fully controlled and after checking that this is
allowed by local regulations and authorities. This is the responsibility of the operator. If the unit is
installed in a room, the safety valves must be connected to discharge pipes.
Note:
(1) These pipes must be installed in a way that ensures that people and property are not exposed to
refrigerant leaks. These fluids may be diffused in the air, but far away from any building air intake, or they
must be discharged in a quantity that is appropriate for a suitably absorbing environment. It is
recommended to install an indicating device to show if part of the refrigerant has leaked from the valve.
(2) The presence of oil at the outlet orifice is a useful indicator that refrigerant has leaked. Keep this
orifice clean to ensure that any leaks are obvious. The calibration of a valve that has leaked is generally
lower than its original calibration. The new calibration may affect the operating range.
(3) To avoid a nuisance tripping or leaks, replace or re-calibrate the valve. Periodic check the relief
valves. Ensure good ventilation, as accumulation of refrigerant in an enclosed space can displace
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