Planned Shutdown; G - Pump Curves Before Impeller Trim; Maintenance - Trane RTAA-70 Installation & Maintenance Manual

Figure 46

G - Pump Curves Before Impeller Trim

RTAA-SVX01A-EN
Pump Package
Impellers are trimmed in 1 / " incre-
8
ments to supply required capacity.
1750 R.P.M.
Responsibility for final impeller siz-
ing remains with ITT Bell & Gossett.
CAPACITY IN U.S. GALLONS PER MINUTE
CAPACITY IN CUBIC METERS/HR

Planned Shutdown

1. Temporary - for short periods under normal ambient conditions, the unit
may be shut down by merely turning all H/O/A switches and discon-
nect(s) to the "OFF" position. Before reactivating the system, each motor
shaft should be turned by hand to see that they rotate freely, and the
pump seal chambers should be re-bled of any air that may have collected
in the system.
2. Long Periods - For extended periods of inactivity, or if freezing conditions
will exist, the unit should be isolated and drained of liquid. Remove vent
and drain plugs from pumps and blow out all liquid passages and pockets
with compressed air.
3. All electrical disconnects should be turned off. The complete start up pro-
cedure should be followed when placing the unit back in service.

Maintenance

Periodic maintenance requirements are minimal. If water contains dirt or
minerals, the y-strainers should occasionally be cleaned.
The mechanical seals used on pumps do not require periodic maintenance.
The electric motors are equipped with bearing grease fittings. In the absence
of specific instruction on the motor, these fittings should be greased every six
months, with relief plug removed.
3AC
G - 3X4X7
1750 R.P.M.
141