Delta eZV-440

enteliZONE Sequence of Operations
Page 64 of 84 eZV-440 Application Guide
Edition 2.6
Space
demand
Box Mode
detects:
Damper Stage
Cooling
demand
Hot air in the
duct, or
HeatCmd in
manual mode
Damper is the first stage of heat.
Cooling
demand
Cold air in the
duct, or
CoolCmd in
manual mode
Damper is the first stage of cooling.
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:
l the minimum (TimePropHtgMin AV152) and maximum heat output (TimePropHtgMax
AV153)
l the minimum (TimePropClgMin AV150) and maximum cooling output (TimePropClgMax
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.