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.