Pre-Startup Checks; General - Trane CGCN Installation Operation & Maintenance

Pre-startup checks

General

Once the unit has been installed, use the following procedure to check that is has been done properly:
WARNING! Remove the power supply from the unit before performing any checks.
Failure to open the power switches at this stage can result in serious injury to the operator or even death.
Inspect all the electrical connections to the power circuits and to the compressors including the contactors, fuse
carriers
and electrical terminals and check that they are clean and well secured. Even though this is done at the factory to
every
unit that is shipped, vibrations from transport could have loosened some electrical connections
Check that the electrical terminals of cables are well tightened. A loose cable can overheat and give rise to
problems
with the compressors. Open discharge, liquid, liquid injection and intake (if installed) taps.
WARNING! Do not start up the compressors if the exhaust, liquid, liquid injection and intake taps are closed.
Failure to open these taps/valves can cause serious damage to the compressor. Place all the thermal-magnetic
switches of the fans.
WARNING! If the thermal-magnetic switches of the ventilators are forgotten open, both compressors will block
due to high pressure when the unit is started up for the first time. Resetting the high-pressure alarm requires
opening the compressor compartment and resetting the high-pressure mechanical pressure switch.
Maximum allowed tolerance +/- 10%.
Voltage unbalance between the three phases must not exceed +/- 3%.
Follow the same phase sequence refers into the wiring diagram. It is available an optional that prevents
compressors from starting in the event of a reverse phase sequence; in the event that, after the unit has been
powered on, the phase monitor should set off an alarm, only invert two phases of the power supply at the main
switch. The monitor is in phase with the electrical motors of the unit, so not invert the phases directly on it.
WARNING! Starting up with the wrong sequence of phases irreparably compromises operation of the
compressor. Ensure that phases L1, L2 and L3 correspond in sequence (R, S and T).
Fill the water circuit and remove air from the system's highest point and open the air valve above the evaporator
skirt.
Remember to close it again after filling. The design pressure on the water side of the evaporator is 10,0 bar.
Never
exceed this pressure at any time during the life of the unit.
WARNING
WARNING
WARNING