FläktGroup Row-DENCO controller Owner's manual

Controller for Row-DENCO®

OPERATION MANUAL

Table of Contents Controller for Row-DENCO

2FläktGroup DC-2014-0110-GB 2019-02/R3 • Subject to modifications

1 Safety and User Information....................................................... 4

1.1 Availability of the operation manual .......................................................... 4

1.2 Used symbols ........................................................................................... 4

1.3 Labelling of safety information ................................................................. 5

1.4 Used safety symbols................................................................................. 6

1.5 Safety-conscious work procedures ........................................................... 6

1.6 Proper use ................................................................................................ 7

1.7 Modifications and changes ....................................................................... 7

1.8 Spare parts ............................................................................................... 7

1.9 Disposal .................................................................................................... 8

1.10 Personnel selection and qualification........................................................ 8

2 General Characteristics............................................................... 9

2.1 User interface............................................................................................ 9

3 Main Screen................................................................................ 11

4 Status Screen............................................................................. 15

5 Parameter Setting Screens ....................................................... 17

5.1 Password management ......................................................................... 18

5.2 Menu items ............................................................................................. 18

5.3 Group A screens ..................................................................................... 19

5.4 Group B screens ..................................................................................... 21

5.5 Group C screens..................................................................................... 22

5.6 Group D screens..................................................................................... 23

5.7 Group E screens ..................................................................................... 24

5.8 Group F screens ..................................................................................... 25

6 Diagrams..................................................................................... 32

6.1 Control diagrams..................................................................................... 32

6.2 Alarm threshold diagram......................................................................... 33

6.3 Ambient humidity control diagram........................................................... 33

7 Operating in Cooling Mode....................................................... 34

7.1 Cooling on chilled water units ................................................................. 34

7.2 Cooling on chilled water units with two interlaced coils .......................... 34

7.3 Cooling on direct expansion units ........................................................... 35

8 Additional Functions ................................................................. 38

8.1 Minimum outlet temperature limit function .............................................. 38

8.2 Dehumidification function........................................................................ 38

8.3 Power transducer function ..................................................................... 39

9 Alarm Event................................................................................ 40

9.1 Serious/minor alarm................................................................................ 40

9.2 Reset alarm status .................................................................................. 42

10 LAN.............................................................................................. 45

10.1 LAN local network management ............................................................. 45

Controller for Row-DENCO Table of Contents

FläktGroup DC-2014-0110-GB 2019-02/R3 • Subject to modifications 3

10.2 LAN network functions............................................................................. 48

10.3 Configuring the software for unit recognition and management .............. 49

11 Connection to the remote terminal from the board................ 50

11.1 Electrical connections ............................................................................. 51

11.2 Maximum distance between the terminal and the board ......................... 51

11.3 Displaying the network from the terminal................................................. 51

12 Serial Boards and Supervisory System................................... 52

13 Alarm Event................................................................................ 55

PROTECTION NOTICES

The reproduction, distribution and utilization of this document as well as the communication of its contents

to others without express authorization is prohibited. Offenders will be held liable for the payment of dama-

Safety and User Information Controller for Row-DENCO

4FläktGroup DC-2014-0110-GB 2019-02/R3 • Subject to modifications

1 Safety and User Information

This is an original operation manual verified by the manufacturer.

FläktGroup Row-DENCO units are designed in accordance with state-of-the-art tech-

nological and engineering standards as well as in conformity with the recognized safety

regulations.

Use the FläktGroup unit in a technically sound condition for the intended purpose

observing the current operation manual, taking safety aspects and potential hazards

into account.

It is important to appreciate that failure to follow the instructions in this manual may

result in danger to health and safety, material-only damage and incorrect unit opera-

tion. Have all faults repaired by an authorized specialist without delay!

1.1 Availability of the operation manual

This operation manual contains important information regarding safe and correct ope-

ration of the unit.

This manual must always be available at the site where unit is operating. Every person

working on the equipment must read this manual fully before commencing the work

and take note of all relevant information while performing a task.

The operation manual is intended to be used by fitting and installation companies, buil-

ding services engineers, technical personnel or trained persons as well as electrical

and refrigeration engineering specialists.

1.2 Used symbols

The following symbols are used to highlight particular text sections in this operation

manual:

– This symbol is used to indicate normal lists.

•This symbol indicates instructions to follow.

The result of an action is indicated with this symbol.

ATTENTION

Risk of damage to the unit!

In case of alarms and faults, always make sure that the cause of the fault is iden-

tified. In particular, multiple resets of an alarms without first rectifying the cause

can damage the unit and invalidate the warranty.

Notice!

Additional details on using the unit are specified here.

Recycling!

This symbol is used to highlight instructions for the proper recycling of packaging

material and assembly groups no longer in use (separated according to recyclable

materials).

Controller for Row-DENCO Safety and User Information

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1.3 Labelling of safety information

To designate the safety instructions the following symbols and notices are provided in

appropriate places throughout this document:

1.3.1 DANGER – Death/serious irreversible injury

Indicates an extremely hazardous situation which will result in death or serious irre-

versible injury, if the safety instruction is not followed.

Example:

1.3.2 WARNING – Death/serious injury

Indicates a hazardous situation which can result in death or serious irreversible injury,

if the safety instruction is not followed.

Example:

1.3.3 CAUTION – Minor or moderate injury

Indicates a hazardous situation which can result in minor or moderate injury, if the

safety instruction is not followed.

Example:

Electrocution through hazardous voltage will lead to death or serious injury.

•Disconnect the unit from the power supply and ensure the power cannot be

switched back on.

•Ensure the unit is voltage-free and isolated, earth and short circuit the unit, cover

or shield off neighboring live components.

High concentration of refrigerants in the air can result in death or serious in-

jury!

High concentration of refrigerants in the air may have an anaesthetic effect and

cause unconsciousness. Prolonged exposure may cause irregular heartbeat and

sudden death. Very high concentration of refrigerant may cause suffocation by

reduced oxygen content in the surrounding air.

•You should therefore only work in an adequately ventilated environment, and

exercise due care and attention when carrying out the work.

•Wear protective clothing and, if necessary, an autonomous breathing apparatus.

Sharp edges can cause injuries!

Observe precaution when cleaning due to risk of cuts on thin and sharp edges.

•Wear protective gloves.

Safety and User Information Controller for Row-DENCO

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1.3.4 ATTENTION – Environmental or material damage

Indicates actions that can result in equipment or property-damage only accidents.

Examples:

1.4 Used safety symbols

1.5 Safety-conscious work procedures

Observe the following instructions when carrying out installation, adjustment or repair

jobs:

•Wear suitable protective clothing during work, such as protective footwear, gloves,

safety goggles, etc..

When working on Row-DENCO equipment you may need to wear suitable Personal

Protective Equipment (P.P.E.) to comply with EN 378-3. Only qualified staff with a

history of assessing and minimising risk should be allowed to work on the equipment.

As a minimum we would suggest suitable safety footwear, suitable gloves, suitable eye

ATTENTION

Risk of environmental damage!

Heavily contaminated filters can have a negative impact on production processes.

Depending on the filtered-out materials, contaminated filters are therefore classi-

fied as hazardous waste and must be properly disposed of according to the pre-

vailing guidelines and laws.

ATTENTION

Risk of damage to the unit!

If dampers are abruptly shut during unit operation, the unit can be damaged

beyond repair as a result of negative pressure or overpressure.

Electrical hazard

Toxic substances

Static discharge

Sharp cutting edges

Environmental damage

Damage to the unit

ATTENTION

Danger of damage due to static discharge!

This symbol warns about risk of static discharge-related damage to the unit.

Controller for Row-DENCO Safety and User Information

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protection and suitable overalls. More P.P.E. may be required depending on your per-

sonal risk assessment.

When working within range of mains voltage:

•Please comply with the installation and shipping instructions for FläktGroup units.

•Observe the pre-commissioning check points.

•Always make sure that the FläktGroup unit is accessible only to authorized and

trained technical personnel. If necessary, use appropriate equipment to keep

unauthorized persons away from the unit.

•Have all leaks eliminated by the FläktGroup Service or a specialist refrigeration

company immediately.

•Pay attention to the safety labels fitted to the unit.

1.6 Proper use

FläktGroup Units of Row-DENCO series are designed as indoor units for connection

with an associated heat rejection system (condensing unit or chiller) and are design to

perform cooling, humidification and filtering of air at atmospheric temperatures.

Unless otherwise stated the equipment will not be suitable for use in a corrosive atmo-

spheres such as, areas near large volumes of salt water, for example.

Proper use also comprises adherence to the operation manual for the controller and

inspection and maintenance requirements stipulated by FläktGroup.

Improper use Any use other than that described above is considered improper. The manufacturer/

supplier is not liable for damage arising from improper use. The user alone bears the

risk.

1.7 Modifications and changes

Changes, alterations or modifications of the unit are not allowed. Tampering with the

unit or its misapplication will invalidate the CE conformity and void warranty.

If delivered units are disassembled by others on-site, the factory warranty is rendered

invalid. In this case professional services by FläktGroup should be arranged in

advance.

1.8 Spare parts

Only original FläktGroup spare parts are allowed, since FläktGroup is not liable if third-

party spare parts are used.

Electrocution through hazardous voltage will lead to death or serious injury.

•Disconnect the unit from the power supply and ensure the power cannot be

switched back on.

•Ensure the unit is voltage-free and isolated, earth and short circuit the unit, cover

or shield off neighboring live components.

Personal injury and damage to the unit!

It is not allowed to operate FläktGroup units of Row-DENCO series:

– in explosion risk areas

– in areas with strong electromagnetic fields, (electromagnetic immunity as of

EMC Directive; refer to the Declaration of Conformity in the unit documentation)

– in environment with high levels of air contamination

– in environments with corrosive and/or aggressive air

Safety and User Information Controller for Row-DENCO

8FläktGroup DC-2014-0110-GB 2019-02/R3 • Subject to modifications

1.9 Disposal

Equipment, operating supply materials, components and filters must be disposed of

according to the material type in a safe and environmentally friendly manner.

1.10 Personnel selection and qualification

Ensure that every person working on the unit has read and understood entire operation

manual. Please read this document fully before commencing any work, and not while

performing a task.

All jobs must only be carried out by qualified licensed staff or other individuals with

proper professional training and experience in the following areas:

– occupational health and safety regulations

– accident prevention regulations

– directives and recognized codes of practice

All jobs with the refrigeration circuit shall be performed only by certified and licensed

staff in accordance with the valid EG Regulation 842/2006 Article 5, EG Regulation

303/2008 Article 4 and 5 as well as "Ordinance on climate protection against changes

caused by release of certain fluorinated greenhouse gases" Article 5, passed by the

German parliament.

All skilled staff must be able to assess the entrusted work and must be able to recog-

nize and avoid all associated dangers.

Controller for Row-DENCO General Characteristics

FläktGroup DC-2014-0110-GB 2019-02/R3 • Subject to modifications 9

2 General Characteristics

2.1 User interface

The user interface comprises:

– 132x64 pixel backlit LCD display

– backlit buttons

The microprocessor board and user interface are connected by a 4-wire telephone

cable via jack J7.

The terminal is supplied directly from the control board via the above-mentioned cable.

Like the control board, this is already configured for operation in a LAN (local network)

so as to share the remote terminal.

Fig. 2-1: User interface

2.1.1 General function of the buttons

ALARM button:

– reset the alarm (if held for 5 seconds)

PRG button:

– enter the parameter setting menu

ESC button:

– exit the screens

UP button:

– scroll and/or change screen

– change values

– scroll inside the menus

ENTER button:

– confirm changes

– access setting areas

DOWN button:

– scroll and/or change screen

– modify the values

– scroll inside the menus

General Characteristics Controller for Row-DENCO

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2.1.2 LED signals

Yellow LED

on the PRG button – the yellow LED on the PRG button is always on when the unit is operating (fans acti-

ve)

Red LED

on the ALARM button – the red LED on the ALARM button flashes in the event of an alarm or maintenance

signal

The green LEDs

include: – the LEDs on the ESC, UP, ENTER and DOWN buttons

– display backlighting

The green LEDs

come on when: – the unit is switched on

– a button is pressed

– there is an alarm or maintenance signal

The green LEDs

go off: – when an alarm event has ceased

– after 180 seconds (3 minutes) of complete inactivity on the user terminal keypad

2.1.3 Adjusting display contrast

PRG + ALARM + UP

– increase contrast

PRG + ALARM + DOWN

– decrease contrast

2.1.4 ON/OFF from keypad

ENTER + PASSWORD – when OFF

– switches the unit on

ENTER + PASSWORD – when ON

– switches the unit off

++

+ PASSWORD

Controller for Row-DENCO Main Screen

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3 Main Screen

3.0.1 Password management

All the parameter setting screens can be accessed after entering a numerical

password. Three password levels are available:

USER password for the user

MAINTENANCE password for use by maintenance technicians/service centres

MANUFACTURER pass-

word only available to the manufacturer's personnel (not disclosed externally)

How to enter the password:

•Pressing the PRG button once displays the screen for entering the user/

maintenance password

•Pressing the PRG button for 5 seconds displays the screen for entering the

manufacturer password

3.0.2 General layout of the main screen

Below is the layout of the main screen, showing the numbered areas this is divided into:

Area 1 This area shows a schematic representation of the controlled unit

Area 2 General unit status

unit off

unit on in normal operation

Main Screen Controller for Row-DENCO

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Area 3 Detailed unit status

active alarm

maintenance signal

manual controls active

unit on/off from terminal

unit on/off from remote contact

unit on/off from supervisory system

reserve unit off in pLAN

unit on in pLAN

reserve unit on in pLAN due to: high/low temperature/humidity

compressor called but shutdown by high pressure function at start up

compressor called but shutdown by unbalanced pressure function at start up

Area 4 This area features an icon that, in the event of an alarm or maintenance signal, indicates either the type of alarm

or device that requires maintenance

With active alarm signal

Pressure

difference DRX

Control envelope shape inconsistent inconsistent DRX

Envelop compressore

inverter DRX

Compressor

inverter DRX

Fire/smoke

alarm

Water

in the condensate

collection

pan

Risk of

condensate

formation DRC

Fan 4 disconnected

Fan 3 disconnected

Fan 2 disconnected

Fan 1 disconnected

Flow alarm DRC/DRX

High compressor discharge temperature alarm DRX

High compressor discharge temperature DRX

High pressure DRX

Frost protection alarm DRX

Low pressure DRX

Electronic thermostatic

valve DRX

Electric heater thermal

protector DRC/DRX

No power DRC

Dirty filters DRC/DRX

Humidifier generic alarm DRC/DRX

Humidifier water drain alarm DRC/DRX

Humidifier cylinder lifetime alarm DRC/DRX

Humidifier offline alarm DRC/DRX

Humidifier high current alarm DRC/DRX

Controller for Row-DENCO Main Screen

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Area 4 With active alarm signal – continued

Humidifier no water

alarm DRC/DRX

Humidifier low current

alarm DRC/DRX

EEPROM

fault

Door

open

Compressor discharge temperature probe DRX

Circuit

2 water temperature

probe

fault DRC

Circuit

1 water temperature

probe

fault DRC

Outlet

air

temperature probe

4

Outlet

air

temperature probe

3

Outlet

air

temperature probe

2

Outlet

air

temperature probe

1

Intake

air

temperature probe

4

Intake

air

temperature probe

3

Intake

air

temperature probe

2

Intake

air

temperature probe

1

Room temperature

probe

Room humidity probe

fault

pLAN

alarm DRC/DRX

High outlet air temperature

High intake air temperature

High

room

temperature

Low

room

temperature

High

room

humidity

Low

room

humidity

High water

temperature, circuit

2DRC

High water

temperature, circuit

1DRC

Power transducer

alarm

Expansion

alarm

Incorrect password

(5 attempts)

If more than one alarm is active, the area displays the most serious alarm. The seriousness of the alarms displayed

in this area reflects the order these are listed in the table, from the most serious to the least serious. The seriousness

of alarms is evaluated based on the consequences these have on operation of the airconditioning unit.

Area 4 With maintenance signal

Inverter-driven compressor hour threshold

Heater 1 and 2 hour threshold

Humidifier cylinder hour threshold

Fan 5 hour threshold

Fan 4 hour threshold

Fan 3 hour threshold

Fan 2 hour threshold

Fan 1 hour threshold

Area 5 This area displays icons corresponding to the currently active devices

Circuit 1 water valve open

Circuit 2 water valve open

Compressor operating level

Main Screen Controller for Row-DENCO

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Area 6 This area displays icons corresponding to the currently active devices

Circuit 2 water valve open (freecooling unit)

Area 7 This area displays icons corresponding to the currently active devices

Humidifier active

Dehumidification active

Area 8 This area displays icons corresponding to the currently active devices

Heaters 1 and/or 2 active

Area 9 This area shows the unit LAN address

Area 10 This area indicates unit on/off from user terminal

press ENTER to switch the unit off

press ENTER to switch the unit on

Area 11 This area shows the time and dates

Area 12 This area displays the maximum outlet temperature read by the 4 probes or the room temperature

(if the corresponding probe is fitted)

Area 13 This area displays the relative humidity of the intake air

(if the corresponding probe is fitted)

Controller for Row-DENCO Status Screen

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4 Status Screen

3

4

5

2

1

6

7

8

9

10

11

USER password

MAINTENANCE password

Change set point

Change maintenance threshold

Reset operating hours

Reset number of starts

MAINTENANCE password

Delete alarm log

Display alarm log

Software INFO

Access log

Number of starts

Operating hours

Read electrical parameters

Set-points

Humidifier status

LAN STATUS

Water valve status

Status of electronic valve

PROBE READINGS

MAIN SCREEN

TO MODIFY

TO RESET

TO DISPLAY

TO MODIFY

NB: the screens described above only

provide information via graphic icons

Status Screen Controller for Row-DENCO

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Starting from the main screen, pressing UP/DOWN accesses the following status screens, in sequence:

1FAN STATUS AND PROBE READINGS: A screen displaying the temperature values read by the

probes (outlet and intake air temperature probe) and percentage of fan operation 1PROBE READINGS

2WATER VALVE STATUS/OPTIONAL PROBE READINGS: A screen displaying the

temperature values read by the probes, chilled water temperature probe and the opening 2Water valve status

Optional Probe readings

of the chilled water modulating valves, as a percentage

3Local Area Network (LAN) status: A screen displaying the status of all the units connected to the

LAN (local network) 3LAN STATUS

4HUMIDIFIER STATUS: A screen displaying the status of the humidifier, with all

the technical operating values 4Humidifier status

5Electronic Valve Status: A screens displaying the data corresponding

to the operation of the electronic thermostatic valve 5Electronic Valve Status

6SET POINTS: A screen displaying the active control set points; from this screen,

pressing PRG and entering the USER password, a further screen can be accessed 6Set Points

for modifying the set point and proportional band

7OPERATING HOURS: A screen displaying the total operating hours of the components on the unit;

from this screen, following the instructions shown on the display 7Operating hours

and after entering the MAINTENANCE password, the operating hours for each component can be

reset (set to zero) or different thresholds can be set for the maintenance alarm

8NUMBER OF STARTS: A screen displaying the total number of starts for the

components on the unit; from this screen, following the instructions shown on the display 8Number of starts

and after entering the MAINTENANCE password, the number of starts for

each component can be reset

9ELECTRICAL PARAMETERS: A screen displaying the electrical parameters

(for units with optional power transducer) 9Electrical parameters

10 ACCESS LOG: A screen to access and display the alarm log. On this screen, the alarm/events log

can be reset, by following the instructions shown on the display after entering 10 Access log

the MAINTENANCE password

11 SOFTWARE INFO: A screen displaying information on the software installed 11 Software INFO

Controller for Row-DENCO Parameter Setting Screens

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5 Parameter Setting Screens

Password

TEST/

Configure type of unit

Presence of remote ON/OFF sensors

MANUALS

TEST

digital input simulators

Temperature and

ADVANCED

SETUP

password (*)

FREE

COOLING

PRG

MAIN SCREEN

CLOCK SETTING

(*) the screens visible with the USER password

are shown in bold.

To display all these screens, the MAINTENANCE

password needs to be entered.

SETUP

SET POINT

SETUP

SENSOR

SETUP

ALARMS SERIOUS

ALARM

RESET ALARMS OUTPUT A/B

SERIAL SETUP LAN SETUP

DUAL

COOLING

MANUALS

TEST

digital output ramp

Enable fans

Setup evaporator fan + “Economy” mode

DEFAULT

SETUP

Setup fan modulation

setup fans

door open alarm

setup valve control

ADAPTIVE SETPOINT

DEW POINT control

AIR FLOW-RATE MODULATION

CONDENSER MANAGEMENT

HUMIDIFIER CONFIGURATION

CONDENSER CONTROL VALVE

MANUFACTURER password

FROST

Parameter Setting Screens Controller for Row-DENCO

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5.1 Password management

Starting from the main screen, pressing the PRG button and entering the correct

password accesses a menu used to set all the other parameters that are not available

on the status screens, as described in the previous paragraph.

Three passwords can be entered:

USER password: allows access to parameters considered useful and easy to understand for the user

MAINTENANCE password: allows access to all the fundamental configuration parameters, which includes user

parameters and the MAINTENANCE parameters.

MANUFACTURER password: allows access to all USER-MAINTENANCE-MANUFACTURER parameters and for

exclusive use by authorised FläktGroup personnel. If required, this password must be

requested, along with reasoning from Customer Technical Service, which will provide

all information if appropriate.

5.2 Menu items

The complete menu items are as follows:

5.2.1 A SETUP (alarms setting)

(USER password) This is used to set the address of the alarm digital outputs available on the controller.

(MAINTENANCE password) This is used to set the thresholds for alarms activated when exceeding a certain limit

(high and low room temperature, high and low relative humidity, high water tempera-

ture).

(MANUFACTURER password) To access to set the delays for some alarms, how serious the alarms are, the type of

reset (automatic or manual) for some alarms, and the addresses of the alarm digital

outputs available on the controller.

5.2.2 B SETUP (serial)

(MAINTENANCE password) To access to configure the serial communication parameters to configure the Local

Area Network (LAN).

5.2.3 C SETUP (control settings)

(MAINTENANCE password) This is used to modify some critical parameters that are part of the control algorithm

installed inside the control system.

5.2.4 D SETUP (clock setup):

(USER password) This is used to set the current time and date.

5.2.5 E TEST/ (test/manual control)

(MAINTENANCE password) This menu is used to manually control all the devices on the unit, for a maximum of

30 minutes, disabling normal automatic control; moreover, the status of all the contacts

(inputs and outputs) that are managed by the control board can be checked.

Controller for Row-DENCO Parameter Setting Screens

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5.2.6 F SETUP (unit configuration)

(MAINTENANCE password) Settings that involve the configuration of the devices, probes and sensors on the unit.

5.2.7 G SETUP

(MANUFACTURER password) Settings corresponding to the electronic expansion valve. This menu is only active on

direct expansion units.

5.2.8 H DEFAULT SETUP

(MANUFACTURER password) This is used to restore the default parameter values.

5.3 Group A screens

5.3.1 Screen A1-A2 “Temperature and humidity thresholds”

(MAINTENANCE password)

This screen is used to change the thresholds to alarms

activated when parameters exceed their limits (room

temperature, room humidity, water temperature).

5.3.2 Screen A3 “ALARM DELAY”

(MANUFACTURER password) This screen is used to change the alarm delays, in particular: the delay in signalling the

alarms when exceeding the room temperature and humidity limits.

5.3.3 Screen A4 “SERIOUS ALARM”

(MANUFACTURER password) This screen is used to set whether each alarm is SERIOUS or MINOR:

SERIOUS: stops the unit from functioning

MINOR: display only, normal cooling and functions resume

See the table in the paragraph „Alarm Event“ auf Seite 55.

IMPORTANT

Damage to the unit!

This operation deletes the entire buffer memory (including the alarm log!), then

installs the default values. The unit then needs to be reconfigured after having

upgraded the software on the board and after having installed the default parame-

ters.

Parameter Setting Screens Controller for Row-DENCO

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5.3.4 Screen A5 “RESET MODE”

(MANUFACTURER password) This screen is used to change the RESET MODE (automatic or manual) for certain

alarms.

5.3.5 Screen A6 “ALARM OUTPUT STATUS”

(USER password) This screen is used to change the status (at rest) of the alarm contacts available.

The control board features two relay outputs for alarm signals.

Accessing the alarm setting screens with the USER password, this item is used to con-

figure the alarm outputs available.

The following functions are available in these screens:

– set the status of the output contacts when de-energised

– set the alarm signal contact

Setting output contact status

This configuration screen is used to set the status of the output

contacts when de-energised.The options are:

– Normally open

– Normally closed

(in this case, power failures to the board can also be signal-

led)

Setting the signal contact

For each type of alarm available on the unit, the contact used to signal the alarm can

be configured. The options are:

– Output "A"

– Output "B"

– No output

By default all alarms are signalled via output "A", which in this case represents a

general alarm output.

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FläktGroup Row-DENCO controller Owner's manual

FläktGroup Row-DENCO controller Owner's manual

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