Orion-system SA Controller Uživatelský manuál stáhnout pdf (Strana 48)

Zone

Programming

SA Controller Operator Interface

VAV/Zone Controller Setpoint Screens

VAV/Zone Controller Setpoints

Setpoint Screen #1 - Occupied Setpoints

XX Box Spts IDXXXX

Occupied Setpoints

Cooling.....: XXºF

Heating.....: XXºF

Enter the Occupied Cooling Setpoint as the maximum temperature

you would like the zone to reach before modulating the damper open

to bring in more cold air to cool the space. Enter the Occupied Heat-

ing Setpoint as the minimum temperature you would like the zone to

reach before activating the Reheat Stages on the optional Expansion

Relay board. If this is a Cooling Only box that doesn’t contain reheat,

this setpoint will be ignored.

Description Minimum Default Maximum

Cooling Setpoint 50ºF 74ºF 90ºF

Heating Setpoint 50ºF 70ºF 90ºF

Setpoint Screen #2 - Unoccupied Setbacks

XX Box Spts IDXXXX

Unoccupied Setbacks

Cooling SetUp: XXºF

Heating SetBk: XXºF

During unoccupied hours, the Occupied Cooling Setpoint is adjusted up

by the amount entered for the Cooling SetUp. The Occupied Heating Set-

point is adjusted down by the amount entered for the Heating SetBk.

Description Minimum Default Maximum

Cooling SetUp 0ºF +10ºF +30ºF

Heating SetBk 0ºF -10ºF -30ºF

Setpoint Screen #3 - AHU Heat Call Space Temp

XX Box Spts IDXXXX

AHU Heat Call

Space Temp...: XXºF

This setpoint allows you to set a Space Temperature that will cause the

VAV/Zone Controller to send a call for heat to the HVAC unit. This only

occurs in the Unoccupied Mode.

Description Minimum Default Maximum

AHU Heat Call Space Temp 50ºF 70ºF 90ºF

Setpoint Screen #4 - Damper Airﬂ ow Integral

XX Box Spts IDXXXX

Damper/Airflow Spt

Integral [Ki]..: XXX

The VAV/Zone Controller normally opens its damper based on a Pro-

portional Error from Setpoint. That means if the zone temperature is 4°F

from setpoint, the damper would be 100% open, or it would be modulat-

ing to provide the Maximum CFM on Pressure Independent boxes. If

the error is less than 4°F, the damper may stagnate at that position and

never satisfy the zone. If you add Integral into the damper calculation

process, this will cause the damper or airﬂ ow calculations to continue to

increase as long as the zone temperature is still above the setpoint. That

means it can provide 100% or Maximum CFM before the 4°F error is

achieved, bringing the zone under control faster than it normally would.

Start with a small (5 or 10) value, if you use this, and monitor the effect

it has. If you enter too large a value, you can create “hunting” situations

that can cause the damper actuator to prematurely wear out.

Description Minimum Default Maximum

Integral 0 0 100

Setpoint Screen #5 - Damper Airﬂ ow Max &

Vent Min

XX Box Spts IDXXXX

Damper/Airflow Spt

Maximum..: XXX %

Vent Min.: XXX %

The VAV/Zone Controller will not allow the damper or airﬂ ow calcula-

tion to exceed the Maximum setpoint while it is allowing the damper to

modulate. During Vent mode when there is no heating or cooling demand,

the damper or airﬂ ow will maintain at least the Vent Min amount of

airﬂ ow into the zone for ventilation.

Description Minimum Default Maximum

Maximum 0% or 0 CFM 100% or

1000 CFM

100% or

30000 CFM

Vent Min 0% or 0 CFM 25% or

250 CFM

100% or

30000 CFM

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