142 RT-SVX36G-EN
Unit Start Up
Pressure Curves
To Check Operating Pressures
1. Start the unit and allow the pressures to stabilize.
Note: If unit includes the 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.
Note: To check operating pressure, see instructions p. 142.
Figure 62. 20 ton standard operating pressure curve (all compressors and condenser fans “On”)
COOLING CYCLE PRESSURE CURVE
250
300
350
400
450
500
550
90 100 110 120 130 140 150 160 170 180
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