Trane RTUB 207-224 - Manual (Page 21)

21
Pre-start checkout
Installation Checklist
When installation is complete, but
prior to putting the unit into service,
the following pre-start procedures
must be reviewed and verified:
• Inspect all wiring connections to be
sure they are clean and tight.
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Disconnect all electric power,
including remote disconnects, before
servicing. Failure to disconnect
power before servicing can cause
severe personal injury or death.
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• Check the tightness of all
connections in the compressor
power circuit (disconnects, terminal
block, contactors, compressor
junction box terminals,…). Loose
connections can cause overheating
at the connections and
undervoltage conditions at the
compressor motor.
• Open all refrigerant valves in the
discharge, liquid, oil, and oil return
lines.
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Do not operate the unit with the
compressor, oil discharge, liquid-line
service valves, or the manual shutoff
on the refrigerant supply to the
auxiliary coolers "CLOSED." Failure
to have these "OPEN" may cause
serious compressor damage.
• Check the power-supply voltage to
the unit at the main-power fused-
disconnect switch. Voltage must be
within the voltage utilization range
and also stamped on the unit
nameplate. Voltage imbalance must
not exceed 2%.
• Check the unit power phasing L1-
L2-L3 in the starter to ensure that it
has been installed in an "A B-C"
phase sequence.
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Improper power phasing can result
in equipment damage due to reverse
rotation.
Do not use untreated or improperly-
treated water. Equipment damage
may occur.
• Fill the evaporator chilled-water
circuit. Vent the system while it is
being filled. Open the vents on the
top of the evaporator water box
while filling and close when filling
is completed.
The use of improperly-treated or
untreated water in this equipment
may result in scaling, erosion,
corrosion, algae, or slime. The
services of a qualified water-
treatment specialist should be
engaged to determine what
treatment, if any, is advisable. Trane's
warranty specifically excludes
liability of corrosion, erosion, or
deterioration of Trane equipment.
Trane assumes no responsibilities for
the results of the use of untreated or
improperly-treated water, or saline or
brackish water.
• Close the fused-disconnect
switch(es) that supplies power to
the chilled-water pump starter.
• Start the chilled-water pump to
begin circulation of the water.
Inspect all piping for leakage and
make any necessary repairs.
• With water circulating through the
system, adjust the water flow and
check the water pressure drop
through the evaporator.
• Adjust the chilled-water flow switch
for proper operation.
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Use extreme caution when
performing the following procedure
with power applied. Failure to do so
can result in personal injury or
death.
• Reapply power to complete the
procedures.
• Prove all Interlock and
Interconnecting Wiring Interlock
and External as described in the
Installation section.
• Check and set, as required, all
UCM-CLD menu items.
• Stop the chilled-water pump.
• Energize the compressor and oil
separators 24 hours prior to unit
startup.
Unit Voltage Power Supply
Voltage to the unit must meet the
criteria given in the Installation
section. Measure each leg of the
supply voltage at the main power
fused-disconnect switch for the unit.
If the measured voltage on any leg is
not within the specified range, notify
the supplier of the power and correct
the situation before operating the
unit.
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Provide adequate voltage to the unit.
Failure to do so can cause control
components to malfunction and
shorten the life of relay contact,
compressor motors and contactors.
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 imbalance is
2%. Voltage imbalance is determined
using the following calculations:
% Imbalance = [(Vx - V ave) x 100]/V
ave
V ave = (V1 + V2 + V3)/3
Vx = phase with the greatest
difference from V ave (without
regard to the sign)
For example, if the three measured
voltages are 391, 407, and 402 volts,
the average would be:
(391+407+402)/3 = 400
The percentage of the imbalance is
then:
[100(400-391)]/400 = 2.25%
This exceeds the maximum
allowable (2%) by 0.25%
Unit Voltage Phasing
It is imperative that L1, L2, and L3 in
the starter be connected in the A-B-C
phase sequence to prevent
equipment damage due to reverse
rotation.
It is important that proper rotation of
the compressors be established
before the unit is started. Proper
Operation
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