Daytime Warm-up
Daytime Warm-up is a feature of VVDA units that can be Enabled or Disabled. Daytime Warm-up is
available with any heat type installed. Daytime Warm-up is a mode used during building-occupied
periods to recover a critical zone that is too cold.
When the Heat Cool Mode Request is Cool (the unit is providing cooling), if a valid space temperature is
3°F below the adjustable Daytime Warm-up Setpoint, the Daytime Warm-up operation initiates. When the Unit is Occupied, DWU is enabled and the space temperature as measured by the DWU sensor is lower than the DWU initiate temperature, the unit switches from VAV to constant volume mode, and the economizer controls to its minimum position. The unit remains in DWU until the temperature in the space reaches the DWU terminate temperature setpoint. (See Heat Types and Maximum Heat section for more information).
When the space temperature is equal to or above the Daytime Warm-up Setpoint, the daytime Warm-up
operation terminates or the unit is Unoccupied. The Symbio™ 700 will transition back to Cool mode. If the Unit is Occupied when DWU is terminated, all heat outputs are disabled, and the unit returns to a VVDA cooling mode.
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WARNING:
Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.