Distech controls Lc-3 User manual

112018

PC-3

User Guide

Table of Contents

Page Title

2 Preface

3 Introduction

4 Operation

5 Menu Tree

9 Network Integration

Images

3 Figure 1 – Main Screen

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.

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.

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 sub-

menu 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.

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.

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.