Delta Controls eZFC-424R4-24, Инструкция по применению

Страница: 61 / 85

enteliZONE Sequence of Operations
Page 60 of 84 eZFC-424R4-24 Application Guide
Edition 2.6
Heating (Fancoil)
Heating load is present when the HeatCoolLoad (AV802) value is between 0 and 100.
The available heating stages in the algorithm are sequential and are as follows: Heat1, Heat2, and
Heat 3. The heating load is evenly divided by the number of heat stages that you’ve set up, plus any
unused fan capacity.
For example, in a system that has 3 stages of heat plus an ECM fan,
l
HeatCoolLoad from 0 to 25% is for the first stage heat, from 25 to 50% for the second stage
heat, from 50 to 75% for the third stage heat, and 75 to 100% will modulate the fan.
l
If the second stage heat was binary, the heat stage would turn ON when HeatCoolLoad rose
above 50% and turn OFF when HeatCoolLoad fell below 25%.
l
If the second stage heat were analog, the heat stage would modulate from 0% at
HeatCoolLoad of 25%, to 100% at HeatCoolLoad of 50%.
l
Without heating interlocks, the ECM fan would run at FanMinSpeed until HeatCoolLoad
reached 75%, and then ramp to FanMaxSpeed as HeatCoolLoad went to 100%.
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.
Cooling (Fancoil)
Cooling load is present when the HeatCoolLoad (AV802) value is between 0 and -100.
The available cooling stages in the algorithm are sequential and are as follows: Cool1 and Cool2.
The cooling load is evenly divided by the number of cooling stages that you’ve set up.
Like the heating stages, the cooling load is evenly divided by the number of cooling stages that
you’ve set up, plus any unused fan capacity. Other than fewer stages, the cooling sequence is the
same as the heating sequence.
If outdoor air temperature (AV9) falls below outdoor air temperature cooling lockout setpoint
( OATCoolLockoutSetpoint ), then all cooling is disabled. The outdoor air temperature will have to
rise by 1.0 °C above this setpoint before the cooling 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.