PC-3
User Guide
© 2018 AbsolutAire, Inc.
112018
Table of Contents
Page Title
2 Preface
3 Introduction
4 Operation
5 Menu Tree
9 Network Integration
Images
3 Figure 1 – Main Screen
1
Preface
The LC-3 Psychrometric Controls Package is a cost-effective system that
will control discharge conditions for installations that need discharge control
of temperature, de-humidification and/or humidification. All calculations are
performed internally so the user only needs to input their desired discharge
conditions. An option for airflow (CFM) monitoring and control is also
available.
For de-humidification the unit will cool the air to the desired dew point, then
heat it to the desired discharge temperature set point. This controls
package will support either a DX unit with an analog signal or a chilled
water valve for cooling. Modulated gas, modulated hot water/steam, or
electric heat sources can be utilized.
If a humidification package with re-heat is added, full control of discharge
conditions can be realized. This can be accomplished with evaporative
media or steam depending on the requirements of the facility with re-heat
being of any type listed above.
Airflow monitoring and control is accomplished by monitoring the air
passing through the fan and controlling a VFD. This allows for automatic
control of air volume with a manual override option for single speed
operation.
Filter monitoring and a full array of alert notifications are also available, all
in a simple to use HMI with a friendly look and feel.
2
Introduction
The Smart-Vue User Interface (UI) for the LC-3 Control System displays
the information necessary to operate and diagnose the Discharge
Temperature and Humidity Control Unit.
Figure 1
At the top left corner of the display there is a bell symbol. This is the system
alarm indicator. If an alarm is present in the unit this indicator will blink. If
no alarm is present this indicator will not be visible. At the top right of the
display is the time in 12-hour format during normal display. When
navigating the menu, the menu title will be displayed here. Across the
center of the display is the data with the units of measure. The system is
capable of displaying up to 4 decimal places. At the bottom left is the fan
status and in the bottom center is the mode of operation.
Three buttons are available for operation (see cover page). The center
button allows you to access the menu and scroll through the menu items.
The up/down buttons are used to change values.
3
Operation
The system has a scrolling display which displays the current Discharge
Temperature, as well as Relative Humidity and Airflow CFM (if equipped
with airflow monitoring and control). The menu is separated into sub-menus
for ease of use, and only the options the unit is equipped with will be
displayed. When navigating the menu blinking items are set points that can
be changed, while non-blinking items are statuses which can only be
viewed.
To turn the unit on or off, press the “up arrow” to access the Fan
Command. Use the “up arrow” to select the desired option, then press the
center button “menu” to return to the main display.
To change set points such as discharge temperature or discharge humidity,
press the “menu” button until you see “SET POINTS” in the top right of the
screen. Press the “up arrow” to enter this sub-menu. Your first choice will
be “TEMP_SET_POINT”. Use the up arrow to select the desired discharge
temperature. When you have made your choice, press the “menu” button to
move to the next menu item, which will be the Discharge Humidity Set
Point. Again, use the “up/down” arrow buttons to make your entry and
press “menu” when finished. Continue scrolling through the Set Points submenu until all of your desired settings are completed. When scrolling the
menu and you see the option “BACK” in the top right, pressing the “up
arrow” will take you to the previous menu.
Scrolling through the “STATUS” sub-menu will allow you to view the status
of all of the unit sensors, cooling, humidity and burner operation. This is
useful for checking unit operation or outdoor conditions.
The “ALARMS” menu will only be displayed if there is a system alarm, as
indicated by the blinking alarm bell on the display. When an alarm is
present, scrolling through this sub-menu will allow you to view the alarm(s)
in “plain English” enumerated text. This is useful for diagnosing the unit in
the event of a problem.
The “CONFIG” menu is where the primary operating set points for the unit
are set such as the minimum and maximum allowable discharge
temperatures, as well as other items. Again, use the “menu” button to scroll
through the sub-menu and the “up/down” buttons to edit your selection.
4
Menu Tree
Scrolling Display
Discharge_Temp – Current discharge temperature at the unit
discharge (if more than one discharge sensor is used this will be an
averaged value of the sensors).
Discharge_Humidity – Current discharge humidity at the unit
discharge (if more than one discharge sensor is used this will be an
averaged value of the sensors).
Discharge_Airflow – If the unit is equipped with airflow monitoring
and control, this will reflect the discharge CFM of the unit (only visible
when airflow monitoring and control is available).
Quick Access
Fan_Command – This is accessed by pressing the “up arrow” from
the main screen and is used to turn the unit ON and OFF.
Set Points
Temp_Set_Point – Discharge Temperature Set Point.
Hum_Set_Point – Discharge Humidity Set Point
CFM_Set_Point – Discharge Airflow CFM Set Point (only available if
airflow monitoring and control is available).
Manual_VFD_Speed – Manual VFD Speed Percent Set Point. This
will override the CFM Set Point (above) and force the VFD to run at a
constant, pre-set speed. For automatic control enter ‘null’ value.
Burner_1_Reset – Preheat Burner reset command for use during a
burner lockout alarm. This is an “on/_on_” toggle selectable via the “up
arrow” button.
Burner_2_Reset – Reheat Burner reset command for use during a
burner lockout alarm. This is an “on/_on_” toggle selectable via the “up
arrow” button.
Status
OA_Temp – Current outside air temperature.
5
OA_Humidity – Current outside air humidity.
Coil_Temp – Current cooling coil exit temperature.
Preheat_Temp – Current preheat exit temperature.
DA_Temp – Current discharge air temperature (if more than one
discharge sensor is used this will be an averaged value).
DA_Humidity – Current discharge humidity (if more than one
discharge sensor is used this will be an averaged value).
DA_Airflow – Current discharge airflow CFM (only available if airflow
monitoring and control is available).
Cooling_Command – Current cooling demand (0% - 100%).
Heat_Command – Current preheat demand (0% - 100%).
Humidity_Command – Current humidification demand (0% - 100%).
Reheat_Command – Current reheat demand (0% - 100%).
Alarms (alarm menu is only visible if an alarm is present)
Dirty_Prefilter – Dirty pre-filter indication (only available if the unit
has dirty pre-filter monitoring as an option).
Dirty_Final_Fltr – Dirty final filter indication (only available if the unit
has dirty final filter monitoring as an option).
Low_Temp_Alarm – Low temperature lockout alarm. This is an
indication that the unit was discharging air colder than the “Low Temp
Alarm” setting in the “Config” menu for greater than “Low Temp Time”
minutes. Check the burner for proper operation.
OA_Temp_Sensor – Outside temperature sensor alarm status.
Enumerated “no-fault/open/short”. Check sensor wiring.
OA_Hum_Sensor – Outside humidity sensor alarm status.
Enumerated “no-fault/open/short”. Check sensor wiring.
Coil_Sensor – Coil exit sensor alarm status. Enumerated “nofault/open/short”. Check sensor wiring.
6
Pre_Heat_Sensor – Preheat temperature sensor alarm status.
Enumerated “no-fault/open/short”. Check sensor wiring.
DA_Temp_Sensor_1 – Discharge sensor #1 alarm status.
Enumerated “no-fault/open/short”. Check sensor wiring.
DA_Temp_Sensor_2 – Discharge sensor #2 alarm status.
Enumerated “no-fault/open/short”. Check sensor wiring.
DA_Hum_Sensor_1 – Discharge humidity sensor #1 alarm status.
Enumerated “no-fault/open/short”. Check sensor wiring.
DA_Hum_Sensor_2 – Discharge humidity sensor #2 alarm status.
Enumerated “no-fault/open/short”. Check sensor wiring.
Preheat_Lockout – Preheat burner lockout alarm status. Indicates
the burner failed to light when requested. Enumerated “normal/lockout”.
Reheat_Lockout – Reheat burner lockout alarm status. Indicates the
burner failed to light when requested. Enumerated “normal/lockout”.
Motor_Not_Resp – Motor not responding alarm status. This
indicates the unit was enabled and the supply fan motor failed to start
within two minutes. Check VFD or overload (as available), OA damper limit
switch and wiring, and power.
Config
Low_Temp_Alarm – If the unit discharges air below this temperature
set point for “Low Temp Time” minutes it will shut down and close the
isolation dampers.
Low_Temp_Time – The time delay (in minutes) for the “Low Temp
Alarm”.
Min_Discharge – The units minimum allowable discharge
temperature.
Max_Discharge – The units maximum allowable discharge
temperature.
7
Advanced Menu (Press and hold “menu” button for 5 seconds to enter)
Date Time
Year – Set the real time clock year.
Date – Set the real time clock date.
Time – Set the real time clock time.
Advanced Config – (Password Protected, Factory Only)
8
Network Integration
The controller in this unit can easily be integrated into a BACnet MS/TP
Building Management System. The controller will automatically detect the
baud rate of the network it is connected to after a power cycle, and will
automatically begin communications.
The MAC Address is set via the dip switches on the front of the controller.
When shipped, each unit will have a factory default MAC address with
multiple units for the same project having incremented MAC addresses.
The dip switches are numbered 1 through 8, with 1 being the LSB. The
numbering is standard binary format (switches 1 and 3 ON equals an
address of 5).
The Network Instance Number (device instance) is automatically
configured based on the MAC Address setting. The network instance
number will always be 3640+(MAC Address). For example, if the MAC
address is set to 25 the network instance number would be 364025. In the
event of a duplicate instance number on the network, simply change the
MAC address to change the instance number.
The following page has a complete listing of the BACnet points with their
descriptions.
9
object-name
object
-
object
-
Outside Temperature
Outside Humidity
Preheat Exit
Discharge Temperature
Discharge Humidity
Discharge Temperature
Discharge Humidity
Discharge Airflow
Preheat
Burner ON
Preheat Burner Lockout
Unit Enable
- Open
Preheat Burner Reset
Reheat Burner Reset
Humidity Enable
type
instance description commandable
Inlet Temperature AI 1
Inlet Humidity AI 2
Sensor Y
Sensor Y
Cooling Coil Temperature AI 3 Coil Exit Temperature Y
Pre-Heat Exit Temperature AI 4
Discharge Temperature 1 AI 5
Discharge Humidity 1 AI 6
Discharge Temperature 2 AI 7
Discharge Humidity 2 AI 8
Airflow Transmitter AI 9
Temperature Sensor Y
Sensor 1 Y
Sensor 1 Y
Sensor 2 Y
Sensor 2 Y
Transmitter Y
Fan ON BI 10 Fan Running Contact Y
Preheat Burner ON BI 11
Preheat Burner Lockout BI 12
Contact Y
Contact Y
Unit Enable BO 1
Damper Y
Pre-Heat Enable BO 2 Preheat Enable Contact Y
Re-Heat Enable BO 3 Reheat Enable Contact Y
Preheat Burner Reset BO 4
Reheat Burner Reset BO 5
Contact Y
Contact Y
Cooling Enable BO 6 Cooling Enable Contact Y
Pre-Heat Command AO 7 Preheat Command Y
Re-Heat Command AO 8 Reheat Command Y
Cooling Command AO 9 Cooling Command Y
Humidity Enable BO 10
Contact Y
Humidity Command AO 11 Humidity Command Y
VFD Command AO 12 VFD Command Y
User HMI_SpaceTemp AI 5001 User HMI SpaceTemp N
CoolingCommandPID LOOP 1 Y
Dirty Filter Alarm [MSV
DirtyPreFitlerAlarm MSV 1
Enumerated] Y
Low Temp Alarm [MSV
LowTempAlarm MSV 2
Enumerated] Y
10
DischargeSensorAlarm MSV 3
Discharge Temp Sensor
Outside Temp Sensor
Outside Humidity
Motor Not Responding
Reheat Burner ON
Reheat Burner Lockout
Dirty Pre
-
Filter Switch
Low Temp Alarm Set
Low Temp Alarm Time
Minimum Discharge
Maximum Discharge
Dirty Pre
-
Filter Switch
Dirty Final Filter Switch
Humidification Type
OutsideTempSensorAlarm MSV 5
OutsideHumiditySensorAlarm MSV 6
PreheatBurnerLockoutAlarm MSV 7
MotorNotRespondingAlarm MSV 9
Alarm [MSV
Enumerated] Y
Alarm [MSV
Enumerated] Y
Sensor Alarm [MSV
Enumerated] Y
Burner Lockout Alarm
[MSV Enumerated] Y
Alarm [MSV
Enumerated] (unit was
commanded on for 2
minutes and fan motor
did not start) Y
Reheat Burner ON BI 13
Reheat Burner Lockout BI 14
Dirty Pre-Filter Switch BI 15
Contact Y
Contact Y
Contact Y
Dirty Final Filter Switch BI 16 Dirty Final Filter Contact Y
Humidity_PID LOOP 2 Humidity Control PID Y
PreHeat_PID LOOP 3 Preheat Control PID Y
ReHeat_PID LOOP 4 Reheat Control PID Y
Airflow PID LOOP 5 Airflow Control PID Y
LowTempAlarmSetPoint AV 1
LowTempAlarmTime AV 2
MinimumDischargeTemp AV 3
MaximumDischargeTemp AV 4
DirtyPreFilterSwitchAvail BV 1
Point Y
(minutes) Y
Temperature Y
Temperature Y
Available Y
DirtyFinalFilterSwitchAvail BV 2
HumidificationAvailable BV 3 Humidification Available Y
HumidificationType BV 4
ReHeatAvailable BV 5 Reheat Available Y
Available Y
(EVAP/STEAM) Y
11
DischargeSensorCount BV 6
Number of Discharge
Airflow (DFM)
Discharge
Temperature
Discharge Humidity Set
Discharge Airflow (DM)
Preheat Burner Reset
Reheat Burner
Reset
Discharge Air
Cooling Command
Preheat Command
Humidification
Reheat Command
Discharge Temp Sensor
Discharge Temp Sensor
AirflowAvailable BV 7
Temp/Humidity Sensors
Available Y
Monitoring and Control
Available Y
DischargeeTempSetPoint AV 5
DischargeHumiditySetPoint AV 6
DischargeAirflowSetPoint AV 7
PreHeatBurnerReset AV 8
ReheatBurnerReset AV 9
Set Point Y
Point Y
Set Point Y
Command Y
Command Y
OutsideTemperature AV 36 Outside Temperature Y
OutsideHumidity AV 37 Outside Air Humidity Y
CoilExitTemperature AV 38 Coil Exit Temperature Y
PreheatExitTemperature AV 39 PreheatExitTemperature
DischargeTemperature AV 40
Temperature Y
DischargeHumidity AV 41 Discharge Humidity Y
DischargeAirflowCFM AV 42 Discharge Airflow CFM Y
CoolingCommand AV 43
PreheatCommand AV 44
Precent Y
Percent Y
Y
HumiditficationCommand AV 45
ReheatCommand AV 46
DirtyFinalFilterAlarm MSV 21
CoilExitTempSensorAlarm MSV 22
PreheatTempSensorAlarm MSV 23
DischargeTempSensorAlarm_1 MSV 24
DischargeTempSensorAlarm_2 MSV 25
Command Percent Y
Percent Y
Dirty Filter Alarm [MSV
Enumerated] Y
Coil Exit Sensor Alarm
[MSV Enumerated] Y
Preheat Sensor Alarm
[MSV Enumerated] Y
Alarm [MSV
Enumerated] Y
Alarm [MSV
Enumerated] Y
12
DischargeHumiditySensorAlarm_1 MSV 26
Discharge Humidity
Discharge Humidity
Reheat Burner Lockout
Return Temp Sensor
Motor Not Responding
Fan Command
Unit Design CFM (used
Manual VFD Speed Set
Altitude in Feet Above
DischargeHumiditySensorAlarm_2 MSV 27
ReheatBurnerLockoutAlarm MSV 28
DirtyFinalFitlerAlarm MSV 4
OutsideHumiditySensorAlarm 1 MSV 8
MotorNotRespondingAlarm 1 MSV 10
Sensor Alarm [MSV
Enumerated] Y
Sensor Alarm [MSV
Enumerated] Y
Alarm [MSV
Enumerated] (unit was
commanded on for 2
minutes and fan motor
did not start) Y
Dirty Filter Alarm [MSV
Enumerated] Y
Alarm [MSV
Enumerated] Y
Alarm [MSV
Enumerated] (unit was
commanded on for 2
minutes and fan motor
did not start) Y
FanCommand BV 8
UnitDesignCFM AV 10
ManualVFDSpeedPercent AV 11
UnitInstallationAltitude AV 12
(enumerated 0=Off /
1=On) Y
when airflow
monitoring and control
not available) Y
Point (overrides
automatic VFD control /
use 'null' value for
automatic control) Y
Sea Level at which the
unit is installed Y
13
Loading...