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RT-SVX36K-EN 147
Thermostatic Expansion Valves
The reliability and performance of the refrigeration system
is heavily dependent upon proper expansion valve
adjustment.Therefore, the importance of maintaining the
proper superheat cannot be over emphasized. Expansion
valves are preset at the factory. In typical applications, field
adjustment should not be required unless the valves are
replaced or damaged.
On air-cooled units, the expansion valves shipped
installed were factory set to control between 14-18°F at the
ARI full load rating conditions (approximately 45°/125°F
saturated suction/discharge).
On evaporative condenser units, the expansion valves
shipped installed were factory set to control between 18-
22°F at the ARI full load rating conditions (approximately
45°/105°F saturated suction/discharge). At part load,
expect lower superheat. Systems operating with lower
Figure 117. 115 ton high operating pressure curve (all compressors and condenser fans “On”)
COOLING CYCLE PRESSURE CURVE
105 Ton High Capacity
250
300
350
400
450
500
550
90 100 110 120 130 140 150 160 170 180
COOLING CYCLE PRESSURE CURVE
115 Ton Standard Capacity
95 °F Ambient
85 °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
Figure 118. 130 ton high operating pressure curve (all compressors and condenser fans “On”)
COOLING CYCLE PRESSURE CURVE
105 Ton High Capacity
250
300
350
400
450
500
550
90 100 110 120 130 140 150 160 170 180
COOLING CYCLE PRESSURE CURVE
115 Ton Standard Capacity
250
300
350
400
450
500
550
90 100 110 120 130 140 150 160 170 180
COOLING CYCLE PRESSURE CURVE
130 Ton Standard Capacity
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
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