Trane Voyager Commercial - Starting 40 to 50 Ton Units

RT-SVX34C-EN 99
Startup
rotation. Refer to the unit wiring schematic and/or wire color markers vs. the compressor
terminal block color markers.
If a scroll compressor is rotating backwards, it will not pump and a loud rattling sound can
be observed. If allowed to run backward for even a very short period of time, internal
compressor damage may occur and compressor life may be reduced. If allowed to run
backwards for an extended period of time, the compressor will likely fail or the motor
windings will overheat and cause the motor winding thermostats to open. The opening of
the motor winding thermostat will cause a "compressor trip" diagnostic and stop the
compressor.
Starting 40 to 50 Ton Units
Install a set of service gauges onto the suction and discharge service ports of each circuit. Follow
the same procedures as above to start the first stage of compressor operation.
After the compressor and the condenser fans have been operating for approximately 30 minutes,
use Tab l e 5 1, p. 101 through Table 64, p. 108 to determine the proper operating pressures for that
circuit.
Jump across the "Test Terminals" once again. This will allow the second stage compressors to start.
The first stage compressor will shut off providing the 3 minute "On" time has elapsed.
Note: When the second refrigerant circuit is requested to operate, both compressors of the 50 ton
unit will run simultaneously. Verify that the compressors are rotating in the correct
direction.
Observe the operation of the compressor(s) and the system operating pressures. After
compressors and condenser fans for the circuit have been operating for approximately 30 minutes,
use Table 54, p. 103 through Table 64, p. 108 to determine the proper operating pressures. For
subcooling guidelines, refer to "Checking Subcooling" at the end of this section.
Units with Lead/Lag function disabled, jump across the "Test Terminals" once again. This will allow
the third stage of cooling (number one circuit) to start providing the 3 minute "Off" time has been
satisfied.
The 40 and 50 ton units employ the use of line weights to dampen vibration. Do not remove,
relocate, or over-torque these weights. The torque specification for the attaching bolts is 6 ft-lbs
± 1.0 ft-lb.
The location of the line weights is shown below.
Figure 52. Economizer (O/A) damper assembly