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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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Copyright © 2021 LG Electronics Inc. All Rights Reserved.
ENGLISH
SEQUENCE MANUAL
MFL71810501
Rev.00_210118
LG SPLIT ROOFTOP DEDICATED OUTDOOR AIR SYSTEM(DOAS)
CONTROLLER
2
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.
3
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
4
NAVIGATION
The function buttons for the keypad / display and the virtual keypad/ display & Web configuration described in below
Figure2. Virtual Keypad
Figure3. Virtual Configuration
Login with Service Manager > SVC > 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
5
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
Up
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.
6
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
7
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
8
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.
9
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.
10
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
11
LG Controller (Main Module)
Drawing
Reference
Terminal
Unit Connection
Type
Position Indicates
Range
2
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
3
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
4
DI1
Forced Stop
NC (Open = Unit Stop)
DI2
Unit Enable / Disable
NO (Closed = Unit Enable)
DI3
Float Switch
NC (Open = Unit Stop)
5
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
6
DO1
DO1-COM Error status
C type
NO (Closed = Alarm)
(C) - COM
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
12
LG Controller (UI Module)
Drawing
Reference
Label
Unit Connection
Type
Position Indicates
Range
2
CH1
CH1 port of Other module for communication
RS485
3
DI1
Occupancy
NO (Closed = Occupied)
DI2
Supply Air filter Switch
NO (Closed = Dirty)
DI3
Unassigned
4
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
2
CH1
CH1 port of Other module for communication
RS485
3
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
13
LG Controller (EEV Module)
#1 (Main Coil #1)
Drawing
Reference
Label
Unit Connection
Type
Position Indicates
Range
2
CH1
CH1 port of Other module for communication
RS485
CH2
IDU_Bus_A&B (To Outdoor Unit)
RS485
3
RI1
Main Coil #1 Refrigerant temperature (Pipe In)
NTC 5k
-130-210F
RI2
Main Coil #1 Refrigerant temperature (Pipe out)
NTC 5k
-130-210F
4
EEV1
Unassigned
EEV2
Main Coil #1 EEV
Step Control
0 - 1350
#2 (Reheat Coil)
Drawing
Reference
Label
Unit Connection
Type
Position Indicates
Range
2
CH1
CH1 port of Other module for communication
RS485
CH2
IDU_Bus_A&B
RS485
3
RI1
Reheat Coil Refrigerant temperature (Pipe In)
NTC 5k
-130-210F
RI2
Reheat Coil Refrigerant temperature (Pipe out)
NTC 5k
-130-210F
4
EEV1
Unassigned
EEV2
Reheat Coil EEV
Step Control
0 - 1350
#3 (Recovery Coil)
Drawing
Reference
Label
Unit Connection
Type
Position Indicates
Range
2
CH1
CH1 port of Other module for communication
RS485
CH2
IDU_Bus_A&B
RS485
3
RI1
Recovery Coil Refrigerant temperature (Pipe In)
NTC 5k
-130-210F
RI2
Recovery Coil Refrigerant temperature (Pipe out)
NTC 5k
-130-210F
4
EEV1
Unassigned
EEV2
Recovery Coil EEV
Step Control
0 - 1350
#4 (Main Coil #2)
Drawing
Reference
Label
Unit Connection
Type
Position Indicates
Range
2
CH1
CH1 port of Other module for communication
RS485
CH2
IDU_Bus_A&B
RS485
3
RI1
Main Coil #2 Refrigerant temperature (Pipe In)
NTC 5k
-130-210F
RI2
Main Coil #2 Refrigerant temperature (Pipe out)
NTC 5k
-130-210F
4
EEV1
Unassigned
EEV2
Main Coil #2 EEV
Step Control
0 - 1350
14
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.
15
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.
16
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).
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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).
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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.
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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.
20
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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