Trane INTELLIPAK Installation Operation & Maintenance page 90

Table 4-6 (Continued)
60 Ton Standard Operating Pressure Curve (All Compressors and Condenser Fans, per ckt, "On")
380
360
340
320
300
280
260
240
220
200
180
50 55 60
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.
70 Ton Standard Operating Pressure Curve (All Compressors and Condenser Fans, per ckt, "On")
360
340
320
300
280
260
240
220
200
180
50 55 60
COOLING CYCLE PRESSURE CURVE
(Based on Indoor Airflow of 400 CFM / Ton)
FULL LOAD
65 70 75
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 within ± 7 psig of the graph.
Cooling Cycle Pressure Curve
(Based on Indoor Airfow of 400 CFM / Ton)
Full Load
65 70 75
Suction Pressure, PSIG
105 F OD Ambient
95 F OD Ambient
85 F OD Ambient
75 F OD Ambient
65 F OD Ambient
80 85 90 95
105 F OD Ambient
95 F OD Ambient
85 F OD Ambient
75 F OD Ambient
65 F OD Ambient
80 85 90 95
90
100
100