LG ARND30UDBE4 User manual

Brand: LG

Model: ARND30UDBE4

Category: Split-system air conditioners

Type: User manual

AIR

CONDITIONER

Please read this installation manual completely before installing the product.

Installation work must be performed in accordance with the national wiring standards

by authorized personnel only.

Please retain this installation manual for future reference after reading it thoroughly.

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ENGLISH

SEQUENCE MANUAL

MFL71810501

Rev.00_210118

LG SPLIT ROOFTOP DEDICATED OUTDOOR AIR SYSTEM(DOAS)

CONTROLLER

Introduction

NOTE:

Please read and save this instructions for future reference.

Read Carefully before attempting to assemble, install, operate

or maintain the product described. Protect yourself and others

by observing all safety information. Failure to comply with

these instructions will result in voiding of the product warranty

and may result in personal injury and/or property damage

WARNING

Electrical shock hazard. Can cause personal injury or

equipment damage. Service must be performed only by

personnel that are knowledgeable in the operation of the

equipment being controlled.

This Manual for Split Rooftop and Compact DOAS, It

should be read considering that there are structural

differences.

Note:

RTD: Rooftop DOAS (ARND***DB** Series)

CTD: Compact DOAS (ARND***DC** Series)

Program Features

The microprocessor controller offers control through

easy monitoring and adjustment of unit parameters by

way of a lighted graphical display and an integral push-

button keypad.

Pre-Programmed Operating Sequences

The controller has been pre-programmed to offer

multiple control sequences to provide tempered air.

Factory default settings allow for easy setup and

commissioning. The sequence parameters are fully

adjustable. Refer to the Sequence of Operation for

details

BMS Communication

The user can remotely adjust set points, view unit status

points and alarms. The microprocessor controller is

capable of communicating over several protocols:

 BACnet® IP  Modbus RTU

Reference Points List for a complete list of BMS points

Alarm Management

The microprocessor controller will monitor the unit’s

status for alarm conditions. Upon detecting an alarm, the

controller will record the alarm description, time, date.

Occupancy Modes

The microprocessor controller offers two modes of

determining occupancy: a digital input the BMS. If in the

unoccupied mode, the unit will either be shut down,

continue normal operation utilizing adjustable

unoccupied set points, recirculate with unoccupied set

points or will cycle on to maintain adjustable unoccupied

room temperature and humidity set points (room

temperature and humidity sensor is optional).

Display Panel

The Web UI and Display are two ways to gain access to

the unit controller allowing monitoring of the unit and

parameter adjustment without being at the unit.

The Web UI can be accessed via a building network and

is included with every unit controller. The Display is an

LCD to be panel mounted in a controller section in the

unit.

TABLE OF CONTENTS

TABLEOF CONTENTS..................................................3

NAVIGATION..................................................................4

PARAMETERADJUSTMENT.........................................5

MAINMENU....................................................................6

SEQUENCEOF OPERATION........................................7

CONTROLLEROVERVIEW........................................ 10

UNITSTATUS.............................................................. 14

TEMPERATURECONTROL....................................... 16

DEHUMIDIFICATION................................................... 17

DAMPERCONTROL................................................... 18

FAN CONTROL............................................................ 19

OCCUPANCY.............................................................. 20

ECONOMIZER............................................................. 20

CO2INTERLOCK......................................................... 21

ADVANCED.................................................................21

ADVACNEDCONTROL............................................... 22

COILCONTROL.......................................................... 23

SENSORSETTINGS ................................................... 23

NETWORKSETTINGS................................................ 24

ALARMS....................................................................... 24

SETTINGS ................................................................... 25

SOFTWARE UPDATE.................................................. 26

WEBUSERINTERFACE............................................. 27

BACNET/MODBUSPOINTSLIST............................... 42

OPEN SOURCE SOFTWARE NOTICE ...................... 44

NAVIGATION

The function buttons for the keypad / display and the virtual keypad/ display & Web configuration described in below

Figure2. Virtual Keypad

Figure3. Virtual Configuration

The microprocessor controller is located in the unit

control center. The face of the controller has six buttons,

allowing the user to view unit conditions and alter

parameters. The microprocessor controller is pre-

programmed with easy to use menus.

Figure4. Main Status Screen

The Main Status screen displays current operating

information. This screen includes:

• Header Line: The header line alternates between the

job name and unit tag. If there are active alarms, the

number of active alarms is displayed instead of the

job information.

• Unit Status Line: System startup information and unit

operation status appears here.

• Four Quadrants: These quadrants have information

that may change every three (3) seconds, depending

on options and sensors installed:

• Upper Left Quadrant: Displays the current value of

the primary control variable. For example, this could

be supply air temperature, room air temperature,

return air temperature, or coil leaving temperature

• Upper Right Quadrant: Displays all temperature and

humidity values that pertain to the air handler

• Lower Left Quadrant: Displays the set-point that

corresponds to the primary control variable in the

upper left quadrant and may rotate through other set-

points

• Lower Right Quadrant: Displays animated symbols

that represent current unit operation (symbols

described in the table1.).

Table1. Main Status Screen Lower Right Quadrant

Symbols

Button

Description

Supply air fan status. Rotation indicates airflow;

static blades indicate no airflow

Cooling

Heating

Economizing

Dehumidifying

Defrost

Figure1.Carel® Controller Keypad

Table2. Keypad Description

Keypad Description

Button

Description

Functions

Main Menu

Press to go directly to the Main Menu from any screen.

From the Main Menu, navigate to the following screens:

 Unit Enable

 Unit Status

 Crtl Variables

 Alarm Menu

Alarm

The Alarm button flashes when there is an active alarm

Press to view alarms

Press twice to go to the alarms reset screen

Escape

Press from the Main Menu to view the Unit status screen.

Press to go back one menu level

Press to navigate through the menus/screens

Press after entering a variable to increase a current value

Enter

Press to enter a highlighted menu or screen item.

Press to enter a writable variable and press again to confirm the new variable value.

Down

Press to navigate menus/screens

Press after entering a variable to decrease the current value

Unit display on web interface only.

These two buttons on the virtual keypad/display are used to simulate two-button actions

on the handheld keypad/display.

To simulate pressing two buttons simultaneously:

1. Click on 2-Button Click.

2. Then, sequentially click on two keypad buttons (Main, Alarm, Escape, Up, Enter,

Down)

To simulate pressing and holding two buttons simultaneously

1. Click on 2-Button Click.

2. Then, sequentially click on two keypad buttons (Main, Alarm, Escape, Up, Enter,

Down)

PARAMETER ADJUSTMENT

The Cursor always begins in the upper left corner of the display and will be blinking.

Press the button to move the cursor down for parameter adjustment.

Once the Cursor has reached the desired parameter, press the buttons to adjust

the value.

When satisfied with the adjustment, press the button to save the parameter.

When finished, make certain the cursor is in the upper left corner. If the cursor is not in

the upper left corner, the changes will not be saved. The cursor must be in the upper

left corner to enable screen advancement.

Main Menu

The Menu Map shows screen order when using either the Handheld Keypad or the Virtual Keypad / Display on the

web interface. See the Navigation section for instructions about moving through menu screens.

Table3. Main Menu

SEQUENCE OF OPERATION

The microprocessor controller can be configured for energy recovery, and dedicated outdoor air systems.

All set points, lockouts and delays are user adjustable via the integral keypad display or web user interface

GENERAL OPERATION

UNIT START COMMAND

The microprocessor controller requires an input to

enable operation. The unit can then be commanded on

or off by this digital input, the BMS When a start

command becomes active the following steps occur:

 Factory mounted and wired dampers are

powered(Outdoor air, recirculation air damper and

Exhaust air damper), if equipped

 Exhaust and Supply fans start after damper delay, if

equipped

 Energy recovery wheel starts, if equipped

 Tempering operation starts after Start up delay

UNIT STOP COMMAND

A shutdown occurs when there is not an occupied or

unoccupied start command. The following shutdown

methods can occur.

Hard shutdown occurs under the following conditions:

 A user or the BMS disables the system, and the

supply temperature is less than the soft shutdown

enable set point.(Base on Heating Operation)

 A user or the BMS disables the system, and the

“Auto Dry” function is activated (Base on

Cooling/Dehumidification Operation)

 Occupancy is commanded to unoccupied while there

is no unoccupied start command, and the supply

temperature is less than the soft shutdown enable

set point.

When a hard shutdown occurs:

 The unit shuts down immediately.

 Dampers spring-return to their off position.

Soft shutdown occurs under the following conditions:

 A user or the BMS disables the system, and the

supply temperature is greater than or equal to the

soft shutdown enable set point.

 There is no unoccupied or occupied start command

and the supply temperature is greater than or equal

to the soft shutdown enable set point.

The following occurs during a soft shutdown:

 Tempering outputs immediately revert back to their

off value; while

 Dampers remain open and fans continue to run; until

- The supply air temperature falls below the soft

shutdown enable set point minus 5.0°F; or

- The soft shutdown delay timer has expired.

UNIT/SYSTEM DISABLED COMMAND

The unit becomes disabled due to the following:

 The unit was disabled from the controller’s Unit

Enable screen.

 The unit was disabled from the BMS.

 The shutdown input is in the shutdown position.

 A shutdown alarm was activated.

When disabled the following actions occur:

 The unit shuts down immediately; and

 Dampers spring-return to their off position.

OCCUPANCY

The microprocessor controller offers four modes of

determining occupancy: digital input, BMS, manually

occupied, or unoccupied. When in the unoccupied

mode, the unit can be configured to shut down, or cycle

on to maintain the unoccupied space set points. The unit

can be temporarily overridden to the occupied mode via

a digital input and keypad display

Occupied Mode:

- Exhaust fan and Supply fan on

- Energy Recovery Wheel Control, if equipped

- Damper Control, if equipped

- Tempering

Unoccupied Mode

 Unit Off: Unit remains off when in unoccupied mode.

 Recirculation with Unoccupied Set points:

Unoccupied mode will operate as if in occupied

mode but will utilize adjustable unoccupied set

points.

- Exhaust fan off

- Supply fan on

- Recirculation air damper open

- OA and EA dampers closed

- Tempering operations begin

SET POINT CONTROL (Occupied)

Temperature set point can be configured as supply

temperature set point or space temperature set point. If

equipped with BMS communications, the user can also

directly command the supply temperature set point, or

space temperature set point, if equipped.

 Space temperature Reset: With a space

temperature sensor, the controller will adjust the

supply air temperature to satisfy the desired space

temperature. Space temperature set point can be

adjusted locally at the Microprocessor or the BMS

SET POINT CONTROL (Unoccupied)

With an unoccupied recirculation damper and optional

space temperature and/or humidity sensors, the unit will

cycle on to maintain the unoccupied space set points.

 Unoccupied Heating: The unit is enabled when

the space temperature is less than the unoccupied

heating set point minus differential (e.g. 60°F - 2°F).

The unit cycles off when the space temperature

reaches the unoccupied heating set point plus

differential (e.g. 60°F + 2°F). Differentia value

defined by a “Heat Cool Deadband” x 1/2

 Unoccupied Cooling: The unit is enabled when

the room temperature is greater than the unoccupied

cooling set point plus differential (e.g.80°F + 2°F).

The unit cycles off when the room temperature

reaches the unoccupied cooling set point minus

differential (e.g. 80°F - 2°F). Differentia value defined

by a “Heat Cool Deadband” x 1/2

 Unoccupied Dehumidification: The unit is

enabled when the space relative humidity exceeds

the unoccupied space relative humidity set point plus

differential (e.g.50% + Hysteresis x 1/2) and cycle off

when the space relative humidity reaches the

unoccupied space relative humidity set point minus

differential (e.g.50%- Hysteresis x 1/2) The

unoccupied space humidity set point will be set to

the average of the unoccupied cooling and heating

temperature.

AIR SOURCE HEAT PUMP (Multi V 5)

When a unit is configured as a Heat Recovery

engineered Multi V 5 system, Scroll Inverter

compressor(s) are used for cooling and heat pump

heating. A reversing valve is energized when the unit is

in heating mode to reverse the flow of the refrigerant.

 Cooling: Mechanical cooling operates by

controlling the compressors to maintain the supply

air temperature set point in cooling mode and to

maintain the cooling coil temperature in

dehumidification mode.

 Heating: When heat is required, the reversing valve

is switched, and the compressors are staged to

maintain the supply air temperature set point.

 Defrost: Periodically, the ASHP need to initiate a

defrost cycle to remove accumulated frost from the

outside coil when operating in heating mode.

Note:

During Outdoor Unit in Defrost Mode, Fan Operation can

be set: Fan Stop / Minimum Air flow rate / Normal

ECONOMIZER

If the application requires cooling, and the outdoor air

conditions are suitable for free cooling, the controller

may enter the economizer state. This optional sequence

requires a space temperature (and Humidity) sensor(s)

and is field-enabled. If equipped with an energy wheel,

wheel is off during economizing

 Temperature: The economizer will be locked out

when:

- The outside air is greater than the economizer

high lockout (65°F adjustable).

- The Unit is operating in dehumidification mode.

- There is a call for heating.

 Temperature/Enthalpy: The economizer will be

locked out when:

- The outside air is greater than the economizer

high lockout (65°F adjustable).

- The outside air is greater than the economizer

high enthalpy lockout (23 btu/lb adjustable).

- The Unit is operating in dehumidification mode.

- There is a call for heating.

DEHUMIDIFICATION

The cooling is controlled to maintain the cooling coil

leaving air temperature set point. If equipped with BMS

communications, the user can also directly set the cold

coil leaving air set point.

 Optional Room Relative Humidity Sensor:

The controller will maintain cold coil leaving air

temperature set point to satisfy the desired room

relative humidity set point.

REHEAT

While the unit is in dehumidification mode, the supply air

can be reheated via Modulating Hot Gas Reheat.

The Microprocessor controller will modulate the hot gas

reheat valve to maintain the supply temperature set

point.

SUPPLY FAN SEQUENCE

The factory installed BLDC Inverter PCB is wired to the

controller.

Supply fan speed needs to be set during test and

balance of the unit. The following sequences are

selectable for supply fan control. The fan speed in

constrained by its min and max speed set points.

 Constant Volume: Supply fan operates at a

constant speed, based on a constant volume set

point (%).

 Air volume (CFM) Control: The controller will

modulates fan motor speed to maintain designed air

flow rate even the total pressure is changed.

 Optional Space CO2 Sensor: The controller will

modulate the supply fan speed based upon a

comparison of the CO2 set point to the actual CO2

levels reported from the sensor.

EXHAUST FAN SEQUENCE (if equipped)

The factory installed BLDC Inverter PCB is wired to the

controller.

Exhaust fan speed needs to be set during test and

balance of the unit. The following sequences are

selectable for supply fan control. The fan speed in

constrained by its min and max speed set points

 Constant Volume: Exhaust fan operates at a

constant speed based on a constant volume set

point (%) based on occupancy.

 Air volume (CFM) Control: The controller will

modulates fan motor speed to maintain designed air

flow rate even the total pressure is changed. If

Differential sensor equipped, at Exhaust fan section)

 Supply Fan Tracking: The exhaust fan

proportionally modulates based on the supply fan

speed plus an adjustable offset.

OUTDOOR AIR AND RECIRCULATED AIR

DAMPER SEQUENCE

If equipped with a modulating outdoor air and

recirculated air damper, the recirculated air damper will

operate inverse of the outdoor air damper. The outdoor

air damper will open to a Minimum Outdoor Air Position

(Min OA) when in occupied mode. If equipped with BMS

communications, the user can also directly reset the

damper position up to the maximum OA position.

ENERGY RECOVERY WHEEL SEQEUNCE (if

equipped)

 Economizer: The economizer will stop the energy

wheel to achieve free cooling.

 Frost Control: The microprocessor controller will

activate the frost control method when maintain

below conditions over 5 minutes

- The outside air temperature is less than 32°F

- The exhaust air temperature is less than 35.6°F.

Once the Exhaust air temperature increases over 45°F,

and maintain the condition for 1 minute, unit will resume

normal operation.

ALARMS

The microprocessor controller includes indication of an

alarm condition. Possible alarms include:

 Main Module Communication Error (Fieldbus

Communication Alarm): It occurs when

communication between the controller and the Main

Module is not established.

 DOAS Device Error (Device Error): It occurs

when DOAS Device Error Code is sent from the

main module. Refer the DOAS Error Code Table (e.g

Filters, Sensors, Fan Motor etc.)

Note:

The alarm below is related with CAREL controller when

below alarms occurred it will be cleared after alarm

reset.

 Retain Memory Alarm (Al_retain): It occurs

when too many writes are made to the controller

Retain Memory

 Retain Memory Write Error Alarm

(Al_Err_retain_write): It occurs when a write

error occurs in the controller Retain Memory.

Controller Overview

Identifying Input and Output Terminals

The following terminal markings are on the control

boards and indicate:

• DI: Digital Inputs (DC: Normal Close / DO: Normal Open)

• DO: Digital Outputs (DC: Normal Close / DO: Normal Open)

• AI : Analog Inputs

• AO: Analog Outputs

• UI : Universal Inputs

• UO : Universal Outputs

• RI : Resistance Input

Control Board Terminal Connections

• See image below for general board layout.

• See the tables on the following pages for standard

terminal connection points.

• See the wiring schematics shipped with the unit for

factory-configured terminal connection points for all

unit

CAREL® Controller

LG Controller (Main Module)

Drawing

Reference

Terminal

Unit Connection

Type

Position Indicates

Range

CH1

CAREL J4 Field Bus Connector

(For Communication with CAREL)

RS485

CH2

RS 485 communication with other Module’s CH1

RS485

CH3

CEN_Bus A&B (To Outdoor Unit)

RS485

CH4

BMS_Bus A&B (To Outdoor Unit)

RS485

UI1

Unassigned

0 – 10Vdc

UI2

Outdoor Air Humidity

0 – 10Vdc

0~100%

UI3

Supply Air Temperature (Field Option)

0 – 10Vdc

-146-210F

UI4

Supply Air Relative Humidity (Field Option)

0 – 10Vdc

0~100%

UI5

Differential Pressure Sensor

(For SA flow rate monitoring & CFM Modulation)

0 – 10Vdc

0-2”wc

UI6

Differential Pressure Sensor (Field Options)

(For EA flow rate monitoring & CFM Modulation)

0 – 10Vdc

UI7

Unassigned

UI8

Space CO2 Sensor(Field Option)

0 – 10Vdc

0-3000ppm

DI1

Forced Stop

NC (Open = Unit Stop)

DI2

Unit Enable / Disable

NO (Closed = Unit Enable)

DI3

Float Switch

NC (Open = Unit Stop)

AO1

Outside Damper output

0 – 10Vdc

0~100%

AO2

Exhaust Damper output

0 – 10Vdc

0~100%

AO3

Recirculation Damper output

0 – 10Vdc

0~100%

AO4

Unassigned

0 – 10Vdc

AO5

Heater_1 (Filed Option) * Only for Split Compact DOAS

0 – 10Vdc

AO6

Heater_2 (Filed Option) * Only for Split Compact DOAS

0 – 10Vdc

DO1

DO1-COM Error status

C type

NO (Closed = Alarm)

NC (Open = Alarm)

DO2

On / Off Status

NO (Closed= Unit On1))

DO3

Unassigned

DO4

Unassigned

DO5

Unassigned

DO6

Solenoid Valve (Reheat Coil)

NO (Closed= Valve open)

Open/Close

LG Controller (UI Module)

Drawing

Reference

Label

Unit Connection

Type

Position Indicates

Range

CH1

CH1 port of Other module for communication

RS485

DI1

Occupancy

NO (Closed = Occupied)

DI2

Supply Air filter Switch

NO (Closed = Dirty)

DI3

Unassigned

UI1

Outside Damper input (Damper position feedback)

0 – 10Vdc

0~100%

UI2

Exhaust Damper input (Damper position feedback)

0 – 10Vdc

0~100%

UI3

Recirculation Damper input (Damper position feedback)

0 – 10Vdc

0~100%

UI4

Unassigned

UI5

Space / Return Duct Temperature (Field Option)

0 – 10Vdc

-130-210F

UI6

Space / Return Duct Relative Humidity (Field Option)

0 – 10Vdc

-130-210F

LG Controller (NTC Module)

Drawing

Reference

Label

Unit Connection8

Sensor Type

Position Indicates

Range

CH1

CH1 port of Other module for communication

RS485

RI1

Space / Return Duct Temperature(Field Option)

NTC 10k

-130-210F

RI2

Unassigned

NTC 10k

-130-210F

RI3

Outdoor Air Temperature

NTC 10k

-130-210F

RI4

Leaving Air Temperature(Main Coil) #1

NTC 10k

-130-210F

RI5

Leaving Air Temperature(Main Coil) #2

NTC 10k

-130-210F

RI6

Exhaust Air Temperature

NTC 10k

-130-210F

RI7

Supply Air Temperature

NTC 10k

-130-210F

RI8

Outdoor Air Temperature After Wheel

NTC 10k

-130-210F

LG Controller (EEV Module)

#1 (Main Coil #1)

Drawing

Reference

Label

Unit Connection

Type

Position Indicates

Range

CH1

CH1 port of Other module for communication

RS485

CH2

IDU_Bus_A&B (To Outdoor Unit)

RS485

RI1

Main Coil #1 Refrigerant temperature (Pipe In)

NTC 5k

-130-210F

RI2

Main Coil #1 Refrigerant temperature (Pipe out)

NTC 5k

-130-210F

EEV1

Unassigned

EEV2

Main Coil #1 EEV

Step Control

0 - 1350

#2 (Reheat Coil)

Drawing

Reference

Label

Unit Connection

Type

Position Indicates

Range

CH1

CH1 port of Other module for communication

RS485

CH2

IDU_Bus_A&B

RS485

RI1

Reheat Coil Refrigerant temperature (Pipe In)

NTC 5k

-130-210F

RI2

Reheat Coil Refrigerant temperature (Pipe out)

NTC 5k

-130-210F

EEV1

Unassigned

EEV2

Reheat Coil EEV

Step Control

0 - 1350

#3 (Recovery Coil)

Drawing

Reference

Label

Unit Connection

Type

Position Indicates

Range

CH1

CH1 port of Other module for communication

RS485

CH2

IDU_Bus_A&B

RS485

RI1

Recovery Coil Refrigerant temperature (Pipe In)

NTC 5k

-130-210F

RI2

Recovery Coil Refrigerant temperature (Pipe out)

NTC 5k

-130-210F

EEV1

Unassigned

EEV2

Recovery Coil EEV

Step Control

0 - 1350

#4 (Main Coil #2)

Drawing

Reference

Label

Unit Connection

Type

Position Indicates

Range

CH1

CH1 port of Other module for communication

RS485

CH2

IDU_Bus_A&B

RS485

RI1

Main Coil #2 Refrigerant temperature (Pipe In)

NTC 5k

-130-210F

RI2

Main Coil #2 Refrigerant temperature (Pipe out)

NTC 5k

-130-210F

EEV1

Unassigned

EEV2

Main Coil #2 EEV

Step Control

0 - 1350

UNIT STATUS

The microprocessor controller will revert to a default main menu loop. This loop includes several screens to view the

operating conditions of the unit. Scroll through the menu screens by using the buttons.

THE INITIAL MENU SCREEN DISPLAYS THE JOB NAME, UNIT TAG, UNIT

STATUS, OUTSIDE AIR CONDITIONS, SPACE CONDITIONS AND SET POINTS

Possible modes include:

 Off/Standby

 Fans Only

 Economizing

 Cooling

 Dehumidifying

 Heating

 Defrost Active

Unit Status Screen Symbols

Symbol

Indicates

Supply air fan status

Rotation indicates airflow : static blades indicate no airflow

Cooling

Heating

Dehumidifying

Economizing

Defrost

OCCUPANCY STATUS

Displays current status of occupancy and the configured occupancy control method

and time zone.

DAMPER COMMANDED POSITION

This screen displays current position of the OA, Recirculation and EA dampers.

SUPPLY FAN STATUS

This screen displays the fan proving status, Supply Air flow monitoring and the

supply fan ramp being sent from the controller to the Inverter Fan PCB. The

controller can modulate the fan between the min and max speeds by Capacity(%) or

Air volume(CFM)

ACTIVE SETPOINT

This screen display the current operation mode and its target setpoint.

In supply temperature control mode, Active Set point meaning target supply

temperature. In space reset mode, Active Set point meaning target space

temperature.

ECONOMIZER RAMP

The economizer ramp screen will be active if the unit is configured for economizer

control. This screen displays the economizer set point, economizer ramp status, and

economizer control mode. Economizer control mode options include, outside dry

bulb, outside enthalpy, comparative dry bulb, and comparative enthalpy.

ENERGY RECOVERY WHEEL STATUS

This screen provides overall status of the energy recovery wheel.

REFRIGERANT STATUS 1

The screen displays the refrigerant In / Out Temperature of Main Coil #1 and #2

REFRIGERANT STATUS 2

The screen displays the refrigerant In / Out Temperature of Reheat Coil and

Recovery Coil

DEHUMIDIFICATION

This screen will display the overall dehumidification status and selected

dehumidification control mode.

The following dehumidification modes are available when the space is in occupied

mode:

• Inside RH*

• Inside dew point*

• Outside dew point

• Inside RH or inside dew point*

• Inside RH or inside dew point or outside dew point

• Inside RH and inside dew point*

• Inside RH and inside dew point or outside dew point

*Available during unoccupied mode.

HGRH RAMP

This screen will display the status of the hot gas reheat ramp. The screen includes

the active set point, supply air discharge temperature, the ramp status, and hot gas

reheat valve request being sent from the controller.

RECOVERY COIL RAMP

This screen will display the status of the hot gas reheat ramp. The screen includes

the active set point, supply air discharge temperature, the ramp status, and hot gas

reheat valve request being sent from the controller.

CONDITIONS

The condition screens are active when both temperature and humidity sensors for

the location are installed in the unit. The enthalpy and dew point are calculated based

on the temperature and humidity readings. The unit altitude is used for the enthalpy

calculation.

TEMPERATURE CONTROL

The controller is equipped with several menus to help guide users with altering program parameters. The following

menus can be accessed by pressing the button. To enter the desired menu, press the button.

Unit Enable

The Unit Enable menu allows the user to enable and disable the unit through the

controller. Reference sequence of operation for additional unit starts/stop details

UNIT ENABLE

The unit ships from the factory in a disabled state. To allow the unit to operate

Change to (Enabled/Disabled): Enables user to manually turn unit on/off via

display. Unit terminal G must have 24 VAC power to enable the unit.

Note:

To allow unit to operate change to (Enabled/Disabled) with digital input signal, use

DI2 port on the Main controller(refer the “Controller section” on Installation Manual)

Control Variables

The Control Variables menu allows the user to view and adjust unit control

parameters.

The Temperature Control menu allows the user to view and adjust temperature

control conditions of the unit.

METHOD FOR TEMPERATURE CONTROL

Set Point Selections:

Supply Temp Control – The supply discharge set point is a constant value

(e.g.72°F). Reference Temperature Set point screen for set point adjustment.

Space Reset – The controller will reset the supply air temperature set point to

maintain the space temperature set point (requires space temp sensor). Reference

the Temperature Set point screen for space set point adjustment.

TEMPERATURE SET POINT

This screen allow to set target temperature set point base on the temperature control

mode

- Supply temperature control: Target Supply Temperature

- Space reset: Target Space Temperature

Set Point Selections:

Local - The space set point will be constant; set from screen (e.g. 72°F).

BMS - The BMS can directly control the target set point (requires

BMS communication option).

HEAT COOL DEADBAND

The heat cool deadband allows for separate cooling and heating entering conditions.

-. Cooling: Setpoint > Setpoint + Dead Band x 1/2

-. Heating: Setpoint < Setpoint – Dead band x 1/2

STARTUP DELAY

This screen displays the delay time after the fans have started and tempering begins

Note:

Tempering is based on determining the operation mode. So compressor does not

operating directly after “startup delay”

COOLING LOCKOUT

This screen displays the cooling lockout temperature. Cooling will be disabled when

outside air is below the cooling lockout temperature (55°F).

DEHUMIDIFICATION

HEATING LOCKOUT

This screen displays the heating lockout temperature. Heating will be disabled when

outside air is above the lockout temperature (80°F).

SPACE SET POINTS DURING UNOCCUPIED MODE

The controller will have separate screens for unoccupied cooling and heating set

points.

Unoccupied Cooling Example: Set point = 80°F, Hysteresis 4°F

Unoccupied cooling is enabled when space temperature equals 80°F + 2°F

(Hysteresis x 1/2) and above.

Unoccupied cooling is disabled when space temperature is below 80°F - 2°F

(Hysteresis x 1/2).

Unoccupied Heating Example: set point = 60°F, Hysteresis 4°F

Unoccupied heating is enabled when space temperature equals 60°F – 2°F

(Hysteresis x 1/2) and below.

Unoccupied heating is disabled when space temperature is above 60°F + 2°F

(Hysteresis x 1/2)

The Dehumidification menu allows the user to view and adjust dehumidification

control parameters.

DEHUMIDIFICATION MODE - OCCUPIED

Possible Modes:

• Inside RH*

• Inside dew point*

• Outside dew point

• Inside RH or inside dew point*

• Inside RH or inside dew point or outside dew point

• Inside RH and inside dew point*

• Inside RH and inside dew point or outside dew point

*Available during unoccupied mode.

There must be a constant call for dehumidification for the duration of the enable

delay for dehumidification mode to become enabled. The call remains active until

conditions are satisfied and dehumidification mode has been active for the min active

time

DEHUMIDIFICATION MODE – UNOCCUPIED

If the unit is unoccupied while there is a dehumidification call, the unit will start and

dehumidify until the unoccupied dehumidification set points are satisfied.

The above dehumidification modes marked with an * indicate availability during

unoccupied mode. The unoccupied dehumidification mode can be set differently than

the occupied dehumidification mode.

DEHUMIDIFICATION HYSTERESIS

This screen displays hysteresis for enabling dehumidification during occupied and

unoccupied conditions. %RH for indoor RH control and °F for outside or space dew

point control. Example: If indoor RH set point = 50%, dehumidification is enabled

when indoor RH equals 50% + (4% x 1/2) and above. Dehumidification is disabled

when indoor RH is below 50% - (4% x 1/2).

DAMPER CONTROL

DEHUMIDIFICATION TIMERS

This screen allows adjustment for delay and min on time for dehumidification mode.

Times are in place to prevent short cycling between dehumidification and other

control modes.

COLD COIL SET POINT

This screen displays the temperature set points for the cooling coil. When in

dehumidification mode, the cooling ramp maintains the cold coil set point by

increasing or decreasing the target pressure by refer the hysteresis value. If a BMS is

available, the set points can be adjusted over the BMS.

DEHUMIDIFICATION PRIORITY

Heating over Dehumidification

Determines when the unit is allowed to dehumidify when heating is active.

a. Heating - If priority is set to heating, box in checked, the unit locks out

dehumidification while heating is active.

b. Dehumidification - If priority is set to dehumidification, box is not checked, the

unit is allowed to switch to dehumidification when heating is active.

HGRH Enable

Determines when unit is allowed to Reheat when Dehumidification is active.

The Damper Control menu’s allows the user to adjust damper control set points.

Economizer set point adjust will also be found at this location if the unit is equipped

with outside air and recirculation dampers.

FAN DAMPER DELAY

This screen allows adjustment for delay time between damper opening and fan

operation. This timer allows the damper to open before the fan start sequence

begins. This prevents the fans from having to overcome higher static pressure when

the damper(s) are opening.

OUTSIDE DAMPER POSITION

The screen displays the min and max positions for the outside and exhaust air

damper. These set points reflect the percentage of the outside air damper being

opened.

0% = Full recirculation air

100% = Full OA & EA

Set Point Selections:

Local – The min OA percentage is constant; set by the controller.

FAN CONTROL

The Supply Fan Control menu allows the user to adjust exhaust control set points

SUPPLY FAN SPEED

The speed set point is the proportional percentage of the RPM or Direct CFM Value

Min speed = 50% Speed

Max speed = 100% Speed

Set Point Selections:

Constant Volume-The fan speed will be constant; set from screen (e.g. 85%).

Air Volume Control - Fan speed is determined by Direct Airflow Input(e.g. CFM)

CO2 – Minimum Fan speed under CO2 control loop.

SOFT SHUTDOWN ENABLE CONDITIONS

During a soft shutdown the following will occur:

 OA & EA dampers close, Recirculation damper open, ERW stop and Supply fan

continue to run; until

- The supply air temperature falls below the soft shutdown enable set point

AUTO DRY CONDITIONS

During an Auto Dry the following will occur:

 OA & EA Dampers close, Recirculation damper open, ERW stop and Supply fan

continue to run; until

- The auto dry active timer has expired.

FAN OPERATION IN DEFROST MODE

During a ODU in defrost mode the following will occur:

 Dampers remain open and fans continue to run until exit the defrost mode.

Fan operation mode during defrost mode can be changed:

- Stop

- Minimum (50%)

- Normal (maintain Target airflow rate)

The Exhaust Fan Control menu allows the user to adjust exhaust control set points

EXHUAST FAN SPEED

The speed set point is the proportional percentage of the RPM or Direct CFM Value

Min speed = 50% Speed

Max speed =100% Speed

Set Point Selections:

Constant Volume (%) - The fan speed will be constant; set from screen (e.g. 100%).

Air Volume Control (CFM) – Fan speed is determined by Direct Airflow Input (CFM),

if differential sensor is equipped.

Supply Fan Tracking with Offset - The exhaust fan will track the supply fan,

between a min and max position. An offset can be added to achieve the proper

balance.

CO2 – Minimum Fan speed under CO2 control loop.

OCCUPANCY

ECONOMIZER

The Occupancy menu allows the user to adjust occupancy control parameters which

includes occupancy control mode and schedule.

OCCUPANCY CONTROL

This screen displays the current mode of operation for occupancy control. Status of

the other mode option can also be found on this screen. This screen allows the user

to select the source of determining occupancy. The factory default is BMS control.

BMS: BMS control (Reference Points List).

Note:

Under BMS control method, occupied or unoccupied mode setting is available.by

manually.

Digital Input: Typically used with a remote time clock, motion sensor or switch.

UNOCCUPIED START ENABLE MODES

This screen only appears if unit is provided with unoccupied recirculation.

This screen allows the user to enable/disable modes of operation when in

unoccupied recirculation control.

The Economizer menu allows the user to enable the Economizer mode and adjust

control parameters which includes economizer control mode and set point

ECONOMIZER CONTROL VARIABLES

The user can select the economizer control method from the following options:

Outside Dry Bulb – Economizing is allowed when the outside dry bulb is less than

the economizer temperature enable set point.

Outside Enthalpy - Economizing is allowed when outside enthalpy is less than the

economizer enthalpy set point.

Comparative Dry Bulb - Economizing is allowed when outside temperature is less

than the space or return temperature.

Comparative Enthalpy - Economizing is allowed when outside enthalpy is less than

the space or return enthalpy.

If economizer Outside dry bulb = 65°F, Hysteresis = 2°F

Economizer operation is enabled below 64°F (65°F - 2°F x 1/2) and disabled above

66°F (65°F + 2°F x 1/2).

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LG ARND30UDBE4 User manual

Brand: LG

Model: ARND30UDBE4

Category: Split-system air conditioners

Type: User manual

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LG ARND30UDBE4 User manual

LG ARND30UDBE4 User manual

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