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Figure 95. 105 ton standard efficiency operating
pressure curve (all compressors and condenser fans
ON)
Figure 96. 115 ton standard efficiency operating
pressure curve (all compressors and condenser fans
ON)
RT-SVX072D-EN
Figure 97. 130 ton standard efficiency operating
pressure curve (all compressors and condenser fans
ON)
Check Operating Pressures
1. Start the unit and allow the pressures to stabilize.
Note: If unit includes Modulating Dehumidification
Control option, pressure curves apply to the
cooling mode only.
2. Measure the outdoor air dry bulb temperature (°F)
entering the condenser coil.
3. Measure the discharge and suction pressure (psig)
next to the compressor.
4. Plot the outdoor dry bulb temperature and the operating
suction pressure (psig) onto the chart.
5. At the point of intersection, read to the left for the
discharge pressure. The measured discharge pressure
should be within ± 7 psig of the graph.
Economizer and Relief Air
Damper Adjustment
Exhaust Air Dampers
Verify that the exhaust dampers (if equipped) close tightly
when the unit is off. Adjust the damper linkage as
necessary to ensure proper closure. An access panel is
provided under each damper assembly.
Outside Air and Return Air Damper
Operation
The outside air and return air damper linkage is accessible
from the filter section of the unit. The damper linkage
connecting the outside air dampers to the return air
dampers is preset from the factory in the number 1
position. Refer to
Table 51, p. 110
linkage position for the unit and operating airflow (CFM).
Unit Start-up
for the appropriate
107
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