CVAHU Equipment Control

Description

Sensor type, Cascade control options, COR Mode, Fan, and Smoke control options.

Purpose

Define equipment control settings.

Mode

Off-line or On-line

Procedure

  1. Click the Equipment Control button on the left pane to open the Equipment Control Configuration page.
  2. Enter information into available fields.
  3. Click Commit to save the settings or Reset to revert to the last saved settings.
  4. Click Next to display the Economizer Parameters Configuration page or Back to display the Input Configuration page.

Fields           

Name Definition
Main Sensor Set sensor type, if any, to Space Temperature or Return Air Temperature.

Return Air option is available only if a Return Air sensor is configured on the CVAHU Controller Inputs page.
Cascade Control Configure cascade control. Default is No.

Yes is available only if both a Discharge Air Temperature sensor and modulating heating or cooling are configured.
C.O.R. Fail Mode Changeover Relay (For Heat Pump only) fail mode: Heating or Cooling.

This option determines which mode (Heating or Cooling) is activated on power failure to the C.O.R. This item is available only if HeatPump was selected on the Output page.
Fan Control You can select one of the following fan control options:
  • Auto - Auto cycles the fan with call for cooling (and heating if Fan – Heating is On).
  • Continuous - Indicates that the fan runs continuously in the Occupied mode, and intermittently (with call for heating/cooling) in the Unoccupied mode.
Fan - Heating Select one of the follwoing options:
  • On
  • Off - Select Off to allow for control circuits where, when in heat mode, the fan is directly controlled by an interlock control circuit (not part of the Excel 10 controller) which brings on the fan once the plenum temperature has risen above its setpoint. This option is typically used in roof top air handlers with gas-fired heating.
Smoke Control This value determines what the controller does when a smoke alarm occurs (either from the digital input, or via the LonWorks network). Select one of the follwoing options:
  • FanOffDmperClose
  • FanOnDmperOpen
  • FanOnDmperClosed
Fan Fail Time Enabled when Air Flow switch is selected. This value sets the amount of time that must pass after fan start-up before the Air Flow Switch is checked. This action allows the fan to come up to speed and prevents false air flow failure alarms.
Filter Pressure Stpt Filter Pressure Setpoint. Enabled if analog Filter Pressure sensor is selected. If the measured pressure exceeds this setpoint, the Dirty Filter alarm is issued. There is a built-in hysteresis of 25 percent of the Filter Press Stpt value (for the Dirty Filter alarm to return to normal).

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