Starting The Compressor; Starting 27.5 To 35 Ton Units; Starting 40 To 50 Ton Units - Trane Voyager CV Installation And Maintenance Manual

Startup
Table 57. Damper adjustment
Damper Opening (In.)
Damper # 1 Damper # 2
2 0
4 0
6 0
8 0
10 0
10 2
10 4
10 6
10 8
10 10
8. Loosen the adjustment screws on each side of the
damper and slide it downward to the required opening.
9. Tighten the adjustment screws and re-install the mist
eliminators and the mist eliminator retainer bracket.
10. Open the main power disconnect or the unit mounted
disconnect switch to shut the unit off and to reset the
RTRM.
11. Before closing the disconnect switch, ensure that the
compressor discharge service valve(s), suction service
valve(s), and liquid line service valve(s) are
backseated.

Starting the Compressor

Optional service valves must be fully opened before
startup (suction, discharge, liquid line and oil line).
NOTICE:
Compressors Failure!
Unit must be powered and crankcase heaters energized
at least 8 hours BEFORE compressors are started. This
will protect the compressors from premature failure.

Starting 27.5 to 35 Ton Units

Install a set of service gauges onto the suction and
discharge service ports. To start the compressor test, close
the main power disconnect switch or the unit mounted
disconnect switch.
Jump across the "Test terminals" on LTB1 or toggle the
test switch three consecutive times if it is a constant
volume application, or five times if it is a variable air
volume application for two to three seconds per jump.
Refer to Table 31, p. 56 - Table 36, p. 58
sequence.
Important: The compressors are protected from
reverse rotation caused by improper
sequencing of the customer supplied unit
power wires by the unit phase monitor. It is
76
Return Air Static Pressure - Inches w.c.
-0.20 -0.40 -0.60
430 590 725
780 1080 1330
1185 1620 1990
1530 2110 2600
1930 2655 3270
2295 3165 3910
2660 3650 4510
3010 4150 5130
3345 4600 5680
3690 5125 6350
for the Cooling Test
-0.80 -1.00 -1.20
840 950 1040
1545 1730 1890
2300 2575 2815
3025 3390 3705
3800 4250 4650
4545 5095 5575
5255 5905 6480
5965 6690 7330
6610 7410 8120
7395 8295 9075
imperative to verify correct sequencing of
compressor power wires to prevent
compressor failure from reverse rotation.
Refer to the unit wiring schematic and/or
wire color markers vs. the compressor
terminal block color markers.
Figure 56. 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
p. 78 through Table 71, p. 84
operating pressures for that circuit.
-1.40 -1.60
1120 740
2035 2170
3030 3240
3985 4240
5005 5345
6010 6415
6995 7470
7900 8440
8765 9365
9775 10420
Table 58,
to determine the proper
RT-SVX34F-EN