Preliminary Start-Up - Bard D36A2P/BLD.10304 Installation And Service Instructions Manual

Replacement parts manual dc free cooling unit system two (2) d-series dual-tec™ wall-mounted package one (1) bard-linktm plc lead/lag controller controller models lc1000-100/bld.10293, lc1500-100/bld.10291

Table of Contents

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.