General Data
8 CG-SVX038A-EN
Ambient Limits —
CCAR/CAUJ Combination
Minimum Ambient Temperature Limit
Refer to SS-APG014*-EN Application Guide – Pairing Trane
CCAR Compressor Chillers (20 to 65 tons) with Trane CAUJ
Air-Cooled Condensers (20 to 80 tons).
In general, the minimum outdoor ambient temperature for
operation of CCAR compressor chiller in combination with
a CAUJ air cooled condenser is 40°F. In some cases, with
factory application approval, the CCAR/CAUJ combination
can be operated down to the 20°F ambient.
This minimum is primarily driven by compressor chiller
starting considerations and not by effectiveness of
condenser ambient controls once the system is up and
running. Fan cycling and optimal low ambient dampers do
not mitigate the low ambient starting challenge. On a cold
day with outdoor ambient temperature below 40°F, the
liquid line pressure at the expansion valve inlet, in most
circumstances, is extremely low. On start, the suction
pressure tends to plunge into the freezing range
potentially causing a nuisance fault.
Contact the factory to request application approval for
applications where CCAR/CAUJ combination is intended
for operation with ambient temperature below 40°F.
Maximum Ambient Temperature Limit
The maximum ambient temperature limit for the CCAR/
CAUJ operation is 110°F.
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