Time-Proportional Heating And Cooling - Delta eZV-440 Application Manual

enteliZONE Sequence of Operations
Space Box Mode
demand detects:
Cooling Hot air in the
demand duct, or
HeatCmd in
manual mode
Cooling Cold air in the
demand duct, or
CoolCmd in
manual mode
If an inlet air temperature has not been configured, the default state for box mode is AutoCool_.
If outdoor air temperature (AV9) rises above outdoor air temperature heating lockout setpoint
(OATHeatLockoutSetpoint), then all heating is disabled. The outdoor air temperature will have to
drop by 1.0 °C below this setpoint before the heating is re-enabled.

Time-Proportional Heating and Cooling

Time-proportional heating and cooling outputs are modulated based on a pulse with a period equal
to the TimePropPeriod (AV154) object value. TimePropPeriod (AV154) has a default value of 100
seconds. The algorithm supports a range between 10 to 600 seconds.
The time-proportional algorithm scales the heating and cooling output using these maximum and
minimum values:
the minimum (TimePropHtgMin AV152) and maximum heat output (TimePropHtgMax
l
AV153)
the minimum (TimePropClgMin AV150) and maximum cooling output (TimePropClgMax
l
AV151)
For each heating or cooling stage, the algorithm calculates how long the active heating or cooling
output object is turned on using the following formula: (heating used as an example)
Hydronic outputs "active" time = TimePropPeriod/100 * (heating stage output% *
(TimePropHtgMax - TimePropHtgMin)/100 + TimePropHtgMin)
Electric output "active" time = TimePropPeriod /100 * heating stage output% *
TimePropHtgMax/100
The time period when the output object is turned off = TimePropPeriod - "Active" time.
Page 64 of 84
Damper Stage
Damper is the first stage of heat.
Damper is the first stage of cooling.
eZV-440 Application Guide
Edition 2.6