Does the morning warmup have a time limit?

Issue:

Does the morning warmup have a time limit?

Resolution:

When the first CCP group becomes occupied, the central control panel enters the morning warm-up/precool mode. This mode holds the ventilation air damper closed on the HVAC unit until the system restores the zone temperatures to their occupied setpoints.

On a Voyager/Reliatel unit, the ventilation damper is commanded closed via the comm link. On noncommunicating HVAC systems (relay board control), the ventilation damper is controlled by Spare Output Relay 6.

The mode terminates when half of the occupied voting zones are satisfied or become opposite callers. Morning warm-up also terminates after two hours or if the system heat/cool mode changes. The spare output is energized during morning warm-up and de-energized when morning warm-up terminates.

From VAV-SVU01A-EN, page 16.

Notes:

 

Changes:

 

Other Question/Problem/Cause Statements:

• Does the morning warmup have a time limit?

Facts:

• VARITRAC III CENTRAL CONTROL PANEL (CCP)
• VariTrac III Central Control Panel (CCP)

Original wave: wave2903