75
The purpose of this limit is to provide reliable machine
operation with variations in entering absorber water
temperatures.
• Fluctuations in entering saturated condensing
temperatures above 90°F (100°F ABSD) will have an
affect on the energy input because of the built in feed-
forward gain function. Sudden changes will result in an
appropriate energy input change. After the transient is
over the energy input will be re-established to the new
input level required for equilibrium at the new ABS
temperature.
• When the saturated condensing temperatures drops
below 90°F (100°F ABSD) there is a potential capacity
flow boundary (limit) imposed on solution capacity flow
control (AFD) signal and an energy input adjustment.
See Figure 25. Reference the left column for the
maximum Flow that will be allowed at a saturated
condensing temperature.
• Only when the desired control system capacity flow
signal exceeds the allowed flow will “Capacity limited
by Low condensing temperature limit” become
displayed and active.
Figure 25
(14) Absorber (Abs)
Entering and Low
Condensing Temperature
Limit
Low Tower Limit
Limit
Saturated Condensing Temperature
Single Stage Steam
Two Stage Steam Direct Fired
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