RWB II ROTARY SCREW COMPRESSOR UNITS
MAINTENANCE
070.200-IOM (DEC 11)
Page 41
THERMAL EXPANSION VALVES
In situations where system load conditions increase or de‑
crease over extended periods of time and the liquid injection
thermal expansion valve is not adequate for the new condi‑
tions, an improvement in valve perfor mance may be achieved
by increasing or decreasing discharge tube size.
NOTE: DO NOT ATTEMPT TO ADJUST SUPERHEAT
ADJUSTMENT STEM ON BOTTOM OF VALVE IN AN EF-
FORT TO CHANGE THE VALVE’S PERFORMANCE. THIS
ADJUSTMENT IS PRESET AT THE FACTORY. ONLY AD-
JUST 1/4" BLEED VALVE ON EQUALIZING LINE.
Figure 34 - TYPE D (1-15 TONS) R-717
Figure 35 - TYPE A (20-100 TONS) R-717
R-717 TX VALVE SIZES
TX VALVE MODE PORT SIZE DISCHARGE TUBE SIZE
DAE ‑ 1 1/16 1/32
DAE ‑ 2 1/16 1/16
DAE ‑ 5 7/64 5/64
DAE ‑ 10 3/16 7/64
DAE ‑ 15 3/16 5/32
AAE ‑ 20 5/16 1/8
AAE ‑ 30 5/16 5/32
AAE ‑ 50 3/8 3/16
AAE ‑ 75 3/8 NONE
AAE ‑ 100 7/16 NONE
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