Pre-Start Checkout - Trane SINTESIS ADVANTAGE CGAF Series Installation Operation & Maintenance

Pre-Start Checkout

Installation Checklist
Complete this checklist as the unit is installed, and verify
that all recommended procedures are accomplished before
the unit is started. This checklist does not replace the
detailed instructions given in the "Installation Mechanical"
and "Installation Electrical" sections of this manual. Read
both sections completely, to become familiar with the
installation procedures, prior beginning the work.
General
When installation is complete, before starting the unit,
the following prestart procedures must be reviewed and
verified:
Caution : Follow proper lockout/tagout procedures to
ensure the power can not be inadvertently energized.
Failure to disconnect power before servicing could result
in death or serious injury
WARNING Live Electrical Components!
During installation, testing, servicing and
troubleshooting of this product, it may be necessary to
work with live electrical components. Have a qualified
licensed electrician or other individual who has been
properly trained in handling live electrical components
perform these tasks. Failure to follow all electrical safety
precautions when exposed to live electrical components
could result in death or serious injury.
1. Inspect all wiring connections in the compressor
power circuits (disconnects, terminal block,
contactors, compressor junction box terminals and
so forth) to ensure they are clean and tight.
2. Verify that all refrigerant valves in the discharge,
liquid, and oil return lines are "OPEN" .
3. Check the power-supply voltage to the unit at the
main-power fused-disconnect switch. Voltage must
be within the voltage use range and stamped on the
unit nameplate. Voltage fluctuation must not exceed
10%. Voltage imbalance must not exceed 2%.
4. Check the unit power phasing L1-L2-L3 in the starter
to ensure that it has been installed in a "A-B-C"
phase sequence.
5. Fill the evaporator chilled water circuit. Vent the
system while it is being filled. Open the vents on the
top of the evaporator during filling and close when
filling is completed.
6. Close the fused-disconnect switch(es) that supplies
power to the chilled water pump starter.
7. Start the chilled water pump to begin circulation of
the water. Inspect all piping for leakage and make
any necessary repairs.
8. With water circulating through the system, adjust
the water flow and check the water pressure drop
through the evaporator.
9. Adjust the chilled water flow switch for proper
operation.
10. Apply power to complete the procedures.
11. Prove all interlock and interconnecting wiring
interlock and external as described in the electrical
installation section.
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12. Check and set, as required, all UC800 TD7 menu
items.
13. Stop the chilled water pump.
14. Energize the compressor and oil separator heaters
24 hours, prior to unit start-up.
Unit Voltage Power Supply
Unit voltage must meet the criteria given in the electrical
installation section. Measure each lead of the supply
voltage at the main power fused-disconnect switch
for the unit. If the measured voltage on any lead is not
within the specified range, notify the supplier of the
power and correct the situation before operating the
unit.
Unit Voltage Imbalance
Excessive voltage imbalance between the phases of a
three-phase system can cause motors to overheat and
eventually fail. The maximum allowable unbalance is
2%. Voltage imbalance is determined using the following
calculations:
% Imbalance = [(Vx – Vave) x 100/Vave]
Vave = (V1 + V2 + V3)/3
Vx = phase with greatest difference from Vave (without
regard to the sign)
Unit Voltage Phasing
It is important that proper rotation of the compressors
be established before the unit is started. Proper motor
rotation requires confirmation of the electrical phase
sequence of the power supply. The motor is internally
connected for clockwise rotation with the incoming
power supply phases A-B-C.
When rotation is clockwise, the phase sequence is
usually called "ABC" , when counterclockwise "CBA"
This direction may be reversed by interchanging any two
of the line wires.
1. Stop the unit from TD7/UC800.
2. Open the electrical disconnect or circuit protection
switch that provides line power to the line power
terminal block(s) in the starter panel (or to the unit
mounted disconnect).
3. Connect the phase-sequence indicator leads to the
line power terminal block (L1-L2-L3).
4. Turn power on by closing the unit supply-power
fused-disconnect switch.
5. Read the phase sequence on the indicator. The ABC
LED of the phase indicator will glow.
CG-SVX039C-GB