Knowledge Base
cancel
Showing results for 
Search instead for 
Did you mean: 

Xenta 102-AX Pressure Dependent Settings for heating mode

Issue

Xenta 102-AX Pressure Dependent Settings for heating mode

Environment

Xenta 102-AX

Cause

A Xenta 102-AX controller set to Pressure Dependent mode will use the minimum heating flow setpoint (SCPTminFlowHeat) to determine the maximum damper position in heat mode.  This parameter defaults to 50% of the cooling maximum, which will limit the damper to values of 50% or below in heat mode.

Resolution

The maximum damper position in heat mode for a Pressure Dependent Xenta 102-AX is defined by the following formula:
(Minimum Heating Airflow / Cooling High Flow) x 100%

For a Xenta 102-AX configured with 1-stage discrete auxiliary heat and the HAF set to 50% of the CHF, the unit will operate according to the following sequence:

  1. Temperature drops, Terminal Load falls to -50%, Damper opens by the same percentage as terminal load up to 50% and stops.
  2. Heat 1 also tracks Terminal Load and when it reaches 90% (when terminal load falls to -90%), Auxiliary Heat 1 enables.
  3. Temperature rises, Terminal Load rises to -50%, Damper starts to close, and Auxiliary Heat 1 stays enabled.
  4. Terminal Load rises to -10%, Damper closes to 10%, Auxiliary Heat 1 disables.

Tags (1)
Labels (1)
Version history
Revision #:
1 of 1
Last update:
2 weeks ago
Updated by: