Trane R Series, Installation Operation & Maintenance

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RLC-SVX07A-EN 131
Unit Shutdown Procedures
Temporary Shutdown and Restart
To shut the unit down for a short time, use the following procedure:
1. Press the Stop key on the Clear Language Display. The compressors will
continue to operate and, after unloading for 20 seconds, will stop when
the compressor contactors de-energize.
2. Stop the water circulation by turning off both the chilled water pump and
condenser pump.
To restart the unit after a temporary shutdown, restart the chilled water pump
and press the AUTO key. The unit will start normally, provided the following
conditions exist:
1. The UCM must receive a call for cooling and the differential to-start must
be above the setpoint.
2. All system operating interlocks and safety circuits must be satisfied.
Extended Shutdown Procedure
The following procedure is to be followed if the system is to be taken out of
service for an extended period of time, eg., seasonal shutdown:
1. Test the unit for refrigerant leakage and repair as necessary.
2. Open the electrical disconnect switches for the chilled water pump. Lock
the switch in the “OPEN” position.
CAUTION
Pump Damage!
Lock the chilled water pump and condenser water pump
disconnects open, to prevent pump damage.
3. Close all chilled water supply valves. Drain the chilled water from the
evaporator and condenser.
4. Open the unit main electrical disconnect and unit mounted disconnect (if
installed) and lock on the “OPEN” position. If optional control power
transformer is not installed, open and lock the 115 V disconnect.
CAUTION
Accidental Start-up!
Lock the disconnects on the “OPEN” position to prevent
accidental start-up and damage to the system when it has been
setup for extended shutdown.
5. At least every three months (quarterly), check the pressure in the unit to
verify that the refrigerant charge is intact.
System Restart after Extended Shutdown
Follow the procedures below to restart the unit after extended shutdown:
1. Verify that the liquid line service valves, oil line, compressor discharge
service valves and suction service valves are open (backseated).