Trane R Series, Installation Operation & Maintenance

Page: 127 / 188

RLC-SVX07A-EN 127
Start-Up Procedures
If the pre-start checkout, as discussed above, has been completed, the unit is
ready to start. The Clear Language Display is shown in
Figure 39 and Clear
Language Display Sequence of Operation is shown in Figure 41 . Complete
each step, in sequence, as follows:
• Press the Stop key on the Clear Language Display.
• As necessary, adjust the setpoint values in the Clear Language Display
menus, as described in Paragraph
"Clear Language Display Keypad Over-
view" on Page 91 .
• Close the fused-disconnect switch for the chilled water pump and con-
denser water pump. Energize the pumps to start water circulation.
• Check the service valves on the discharge line, suction line, oil line and
liquid line for each circuit. These valves must be open (backseated) before
starting the compressors.
CAUTION:
Compressor Damage!
To prevent compressor damage, do not operate the unit until all
refrigerant and oil line service valves are opened.
• Verify that the chilled water pump runs for one minute after the chiller is
commanded to stop (for normal chilled water systems). See Paragraph
"Interconnecting Wiring" on Page 62 .
• Press the Auto key. If the chiller control calls for cooling and all safety
interlocks are closed, the unit will start. The compressor(s) will load and
unload in response to the temperature of the leaving chilled water tem-
perature.
Once the system has been operating for approximately 30 minutes and has
become stabilized, complete the start-up procedures, as follows:
• Check the evaporator refrigerant pressure and the condenser refrigerant
pressure under Refrigerant Report on the Clear Language Display. The
pressures are referenced to sea level (14.6960 psia).
• Check the liquid line sight glasses. The refrigerant flow past the sight
glasses should be clear. Bubbles in the refrigerant indicate either low
refrigerant charge or excessive pressure drop in the liquid line. A restric-
tion in the line can sometimes be identified by a noticeable temperature
differential between the two sides of the restriction. Frost may often form
on the line at this point. Proper refrigerant charges are shown in
Table 1 .
NOTE: A clear sight glass alone does not mean that the system is properly
charged. Also check system superheat, subcooling, and unit operating
pressures.
• Measure the system superheat. Refer to Paragraph "System Superheat"
on Page 128 .
• Measure the system subcooling. Refer to Paragraph "System Subcooling"
on Page 128 .
• A shortage of refrigerant is indicated if operating pressures are low and