Setpoint Manager: setpoint node conflicts with another setpoint manager.

asked 2016-05-16 16:02:11 -0600

rkbest
1392 ●1 ●4 ●13

updated 2016-05-16 16:10:05 -0600

I have implemented setpoint manager similar to Example files 5ZoneVAV-ChilledWaterStorage-Mixed.idf but I am getting a warning of conflicting nodes used in two setpoint managers as below. The setpoint Managers are 1. OA Mixed Air Temperature and 2. SEtpointManager:OutdoorAirReset. As the conflicting node is same for a VAV reheat system. How can I fix this or if not fixed what implications it has on the calculations?

** Warning ** SetpointManager:Scheduled="SETPOINT MANAGER SCHEDULED 1"
**   ~~~   ** ...setpoint node conflicts with another setpoint manager.
**   ~~~   ** ...conflicting setpoint manager = SetpointManager:OutdoorAirReset:"AHU1 OUTLET SETPOINT"
**   ~~~   ** ...conflicting node name = AIR OUTLET NODE1
**   ~~~   ** ...control type variable = Temperature

IDF file - http://pastebin.com/H7V2AHRz

answered 2016-05-16 17:48:42 -0600

rraustad

13814 ●79 ●12 http://www.fsec.ucf.edu/

updated 2016-05-16 22:28:08 -0600

Setpoint managers are simulated in order of occrence as found in the input file and by set point manager type as coded within the program. The last SPM to be simulated will overwrite the previous node set point temperature.

If you are using the mixed air set point managers to adjust the temperature set point based on fan heat and then write that value to a different node then the solution is to move one of those SPM values to any other node in the simulation (any node that is not used to store a temperature set point).

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Thanks @rraustad , Yes I am trying to adjust the setpoint based on fan heat. Can you guide me how to do that or direct me to an example.

rkbest ( 2016-05-16 21:01:17 -0600 )edit

Put a set point on a node, any node not currently used to hold a temperature set point. Then use the mixed air SPM to reference that node set point, also entering fan inlet/outlet nodes, and place the fan heat adjusted temperature set point on the node where you need it. You can't use 2 different reference nodes (i.e., both a sceduled AND OAReset SPM) to use with the mixed air SPM.