| Application Considerations Figure A-2 — Typical Condensate
Piping
The unit control has adjustable features which minimize
steam draw on start-up. The adjustable steam control feature allows the user to adapt the
machine to the available steam source capability.
Condensate Handling
At full load, the condensate leaving a two-stage absorption
chiller is approximately 210 F (+98.9 C). This temperature minimizes flashing in a low
pressure or open condensate return system. An automatic condensate trapping system is
provided as standard with the unit. This system is designed to dump condensate into an
atmospheric return.
Figure A-2 illustrates a method of condensate drainage.
Hot Water Piping and Operating Limits
Expansion of the tubes in the generator is a normal
condition due to the water temperatures reached in the tube bundle. All Trane absorption
units use a combination of fixed and floating tube supports to control the direction of
generator tube expansion. Normally, this expansion is uniformly distributed throughout the
bundle. However, during shutdown, when very small amounts of hot water may leak through
the valve, the first tube pass reaches the temperature of the hot water while the
remaining passes are cold. Consequently, it is recommended that the supply and return
piping include a circulating pump, check valve and cold legs to protect the generator
tubes from the unequal expansion should the control valve leak during unit shutdown. This
system is designed to eliminate hot water flow through the generator during unit shutdown.
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