Hi John,
I haven't done this yet myself, but you can define gas-powered chillers in the DD wizards here...
[cid:image001.png at 01CEEF49.029F04B0]
This looks something like the following post-wizards - apparently there are library curves and everything ready to go for gas absorption chillers:
[cid:image002.png at 01CEEF49.5016DDD0]
[cid:image003.png at 01CEEF49.5016DDD0]
Regards,
NICK CATON, P.E.
