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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
Figure 62. 20 ton standard operating pressure curve (all compressors and condenser fans “On”)
COOLING CYCLE PRESSURE CURVE
95 °F Ambient
85 °F Ambient
75 °F Ambient
65 °F Ambient
105 °F Ambient
250
300
350
400
450
500
550
90
100
110
120
130
140
150
160
170
180
Suction Pressure, PSIG
D
ischar
ge P
ressur
e
, P
S
IG
