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

Pre-startup checks

5 Pre-startup checks
5.1

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.
WARNING! 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. Switch on all the
circuit breakers 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 fi rst 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%.
The unit comes with a factory-supplied phase monitor
that prevents compressors from starting in the event
of an erroneous phase sequence. Properly connect the
electrical terminals to the disconnect switch so as to
ensure alarm free operation. In the event that, after the
unit has been powered on, the phase monitor should
set off an alarm, only invert two phases at the general
disconnect switch input (Unit input). Never invert the
electrical wiring on the monitor.
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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 to 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 fi lling. The design
pressure on the wter side of the evaporator is 10.0 bars.
Never exceed this pressure at any time during the life of
the unit.
WARNING! Before placing the unit into operation,
clean the hydraulic circuit. Dirt, incrustation, corrosion
residue and other extraneous material can accumulate
in the heat exchanger and reduce its thermal exchange
capacity. Pressure drops can also increase, consequently
reducing water fl ow. Thus, correct water treatment
reduces the risk of corrosion, erosion, scaling, etc. The
most appropriate water treatment must be established
locally, according to the type of installation and to the
characteristics of the process water locally. Trane is
not responsible for damage or bad operation of the
apparatus resulting from failure to treat water or from
incorrectly treated water.
Close the main switch placed on the door of the main
electrical panel and move the switch in the position On.
Make sure that the display shows: "Unit in stand-by. "
WARNING! From this moment on, the unit will be
electrically powered. Use extreme caution in operations
later.
Failure to observe this WARNING! in subsequent
activities can cause serious harm to people
RF-SVX003A-GB