98 RT-SVX34C-EN
Startup
6. With the supply fan "On" and rotating in the proper direction, measure the return duct static
pressure.
7. Using the Table below, enter the desired amount of fresh air and the return air static pressure
reading to obtain the proper damper opening dimension.
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.
Open the main power disconnect or the unit mounted disconnect switch to shut the unit off and
to reset the RTRM.
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 28, p. 74 Table 29, p. 74 for the Cooling Test sequence.
Note: 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
Table 50. 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
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