Bard D36A2P/BLD.10304, Installation And Service Instructions Manual

Page: 19 / 107

Manual 2100-620A
Page 19 of 107
PRELIMINARY START-UP
RUNNING IN STAND ALONE (ORPHAN) MODE
With both AC and DC breakers turned on, each D-Series wall-mount system has the capability to run without the PLC
controller attached—this feature is called Stand Alone or Orphan Mode, and it basically keeps the shelter between
60°F and 78°F by the use of the factory-installed return air sensor in each wall-mount unit.
During installation, this allows deactivation of one of the two existing, older wall-mount units, while keeping the
shelter cool with the other unit still operating. Once the first of the two Bard wall-mount units is installed, Orphan
Mode can be enabled early in the installation—keeping the climate inside the shelter stable and the installers
comfortable while the remainder of the older equipment is removed and the second Bard wall-mount unit and PLC
controller is installed.
Additionally, should either or both D-Series wall-mount units lose communication with the PLC controller (such as
during maintenance), they will continue to serve the shelter's needs until a repair can be made.