Trane INTELLIPAK Installation Operation & Maintenance page 86

Table 4-6
25 Ton Hi Eff Cond Operating Pressure Curve (All Compressors and Condenser Fans "On")
360
340
320
300
280
260
240
220
200
180
160
50 55
To Check Operating Pressures
1. Start the unit and allow the pressures to stabilize.
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.
COOLING PRESSURE CURVE
(Based on Indoor Airflow of 400/CFM)
FULL LOAD
60 65 70 75 80
SUCTION PRESSURE, PSIG
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 w ithin ± 7 psig of the graph.
105 F OD Ambient
95 F OD Ambient
85 F OD Ambient
75 F OD Ambient
65 F OD Ambient
85 90 95 100
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