Startup
76 RT-SVX34F-EN
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).
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 for the Cooling Test
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
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.
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 Table 58,
p. 78 through Table 71, p. 84 to determine the proper
operating pressures for that circuit.
Table 57. Damper adjustment
Damper Opening (In.) Return Air Static Pressure - Inches w.c.
Damper # 1 Damper # 2 -0.20 -0.40 -0.60 -0.80 -1.00 -1.20 -1.40 -1.60
2 0 430 590 725 840 950 1040 1120 740
4 0 780 1080 1330 1545 1730 1890 2035 2170
6 0 1185 1620 1990 2300 2575 2815 3030 3240
8 0 1530 2110 2600 3025 3390 3705 3985 4240
10 0 1930 2655 3270 3800 4250 4650 5005 5345
10 2 2295 3165 3910 4545 5095 5575 6010 6415
10 4 2660 3650 4510 5255 5905 6480 6995 7470
10 6 3010 4150 5130 5965 6690 7330 7900 8440
10 8 3345 4600 5680 6610 7410 8120 8765 9365
10 10 3690 5125 6350 7395 8295 9075 9775 10420
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.
Figure 56. Compressor terminal block color markers
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