Delta Controls eZFC-424R4-24, Application Manual

Page: 73 / 85

enteliZONE Sequence of Operations
Page 72 of 84 eZFC-424R4-24 Application Guide
Edition 2.6
Open Window Detection
When the opening of windows is being monitored and an open window is detected, all heating and
cooling stages are disabled. Heating is re-enabled when the space temperature falls below 6 °C.
Heat Pump
The algorithm supports one or more heat and cooling stages for heat pump devices. This section
describes what to expect when you’re setting up a heat pump in the configuration graphic.
If you want to control the reversing valve using the configuration graphic, the reversing valve will
switch between the heat and cooling stages in response to the heat and cooling loads at each
stage. Heat and cooling demands are indicated by the HeatCoolLoad (AV802) value. For more
information about HeadCoolLoad and how the heat and cooling loads are divided between the
different heat and cooling stages, see the Heating and Cooling sections in this Sequence of
Operations section.
When switching between heating and cooling, the algorithm will not change the state of the
reversing valve until all compressor outputs have been off for at least 60 seconds.
With no reversing valve output configured, the algorithm turns the Heatx outputs on when there is
heating demand, and turns the Coolx outputs on when there is cooling demand.