Installation guide

Warning
Please Note
The specifications of the product detailed on this
Set-Up Guide may change without notice. RDM
Ltd. shall not be liable for errors or for incidental
or consequential damages, directly and indirectly,
in connection with the furnishing, performance or
misuse of this product or document.
Ensure that all power is
switched off before
installing or maintaining
this product
Revision 2.7 Page 56 of 83
Mercury Plant Controller Installation Guide
External Target
Pack Controller
To use Sect 1/2 Ext Target (P473/474) instead of Section 1/2 Target Pressure (P-20/40) a status Input must be set
to “Run 1/2 N/O or N/C”.
When the input is activated the Target Pressure will change from (P-20/40) to (P473/474)
When the input is de-activated the Target Pressure will revert back to (P-20/40)
Condenser Controller
Heat Reclaim must be set to “On” or “On/Rly”.
To use Sect 1/2 Ext Target (P473/474) instead of Section 1/2 Target Pressure (P-20/40) a Status Input must be set
to “Run 1/2 N/O or N/C”.
With Heat Reclaim parameter (P440/441) set to “On” the following will occur: -
When the input is activated the Target Pressure will change from (P-20/40) to (P473/474)
When the input is de-activated the Target Pressure will revert back to (P-20/40)
Or
With Heat Reclaim parameter (P440/441) set to “On/Rly” the following will occur: -
When input is activated the Target Pressure will change from (P-20/40) to (P473/474) and turn on the Heat
Reclaim relay output.
When input is de-activated the Target Pressure will revert back to (P-20/40) and turn off the Heat Reclaim
relay output.
Remote TDB Command
To use a Remote Ext Target Set Point sent from a Data Manager TDB Program Instead of the value entered for the
Ext Target setpoint (P473/474), for a Pack or Condenser, then the following must be configured: -
Status Input must be set to “Run 1/2 N/O or N/C” and if required the above for Heat Reclaim has to be set
(P440/441) to either “On” or “On/Rly”.
When input is activated the Target Pressure will change from (P-20/40) to whatever Target Pressure is
being sent from TDB program. The settable range for “Rem Ext 1/2” is -3.4 Bar to 150 Bar.
When input is de-activated the Target Pressure will revert back to (P-20/40)
Send Ext Target Set Point Command to “Rem Ext 1”/ “Rem Ext 2” using a Data Manager TDB program. Analogue
Output block.