Danfoss GDA, GDC, GDHC, GDHF, GDH Installation guide

Installation Guide

6 configurations

2 configurations

1 configuration

communication

Controller solution

monitoring unit

Gas Detection Unit (GDU)

GDA, GDC, GDHC, GDHF, GDH

Technician use only!

This unit must be installed by a suitably qualified technican who

148R9631

will install this unit in accordance with these instructions and the
standards set down in their particular industry/country.

Info for UK customers only:
Danfoss Ltd.

Oxford Road, UB9
4LH Denham, UK

ENGLISH

Please observe that a Danfoss GDU works as a safety device
securing a reaction to a detected high gas concentration. If a
leakage occur, the GDU will provide alarm functions, but it will
not solve or take care of the leakage root cause itself.

148R9631

Suitably qualified operators of the unit should be aware of the
regulations and standards set down by their industry/country for
the operation of this unit.

These notes are only intended as a guide and the manufacturer
bears no responsibility for the installation or operation of this unit.

Failure to install and operate the unit in accordance with these
instructions and with industry guidelines may cause serious injury
including death and the manufacturer will not be held responsible
in this regard.

It is the installer’s responsibility to adequately ensure that the
equipment is installed correctly and set up accordingly based on
the environment and the application in which the products are
being used.

Configurations and Wiring: All 3 types of Gas Detection Units (GDU)

Annual Test

To comply with the requirements of EN378 and the F GAS
regulation sensors must be tested annually. Danfoss GDU's are
provided with a test button that should be activated once a year
for testing of the alarm reactions.
Additional the sensors must be tested for functionality by either
Bump test or Calibration. Local regulations should always be
followed

After exposure to a substantial gas leak, sensor should be checked
and replaced if necessary.
Check local regulations on calibration or testing requirements.

Service tools

Gas Detection Controller

Option: Modbus
Option: UPS

Max. 96 sensors

Wire break

Premium

Basic +

Basic

Sensor

Sensor

Basic GDU

Buzzer and light
3-color-alarm

1

© Danfoss | Climate solutions | 2021.06

Premium+

Buzzer and light
3-color-alarm

Premium Flex

Premium GDU (Controller)

Premium Remote

5 meter

remote sensor

Premium Duplex

Sensor 2

Premium Uptime

Display

UPS

Service Tool

Handheld

Danfoss Pen

for Heavy

Heavy Duty

Sensor

Heavy Duty GDU

Duty display

AN272542819474en-000201 | 1

oss

Relays 1 and 2 de-energized (default)

Relay 3 energized (default)

Danfoss Basic GDU

12 4

Bus_B

Bus_A

0 V AC/DC

24 V AC/DC

Ackn. -/Test

button T1

X4

3

4

X8

X2

5

X9

Service Tool

Buzzer &
3-light alarm

X1

Analog Output

Status LED

Green/Yellow/Red

GND

JP5*

Open: 4-20mA
Closed: 2-10V AO_01

Jumper

J1
J2
J3

Sensor

Danfoss

148H119_11-2018

Status LED:

GREEN is power on.

YELLOW is an indicator of Error.

- when the sensor head is disconnected or
not the expected type

- AO is activated but nothing connected

- flashing when sensor is in special mode
(e.g. when changing parameters)

RED on alarm, similar to the Buzzer & light
alarm.

Ackn. -/Test button:

TEST - The button must be pressed
for 20 sec.

- Alarm1 and Alarm2 is simulated, stop
on release

ACKN. - Pressed while Alarm2, the audible
warning switches off and goes back on after
5 min. when the alarm situation is still active.

* JP5 open → AO 4 – 20 mA (Default)
JP5 closed → AO 2 – 10 Volt

NOTE:

A resistor comes installed on the analog
output connections – if analog output
is used, remove the resistor.

2

Danfoss Premium GDU

Power 24 V DC

23

GND

24 V DC

Ackn./Test
button

Power Bus Comm.

2

3

1

X11

DI_1

DI_2

GND

Digital

Input

Buzzer &
3-light alarm

3

1

X1

NC

Local
Bus_1

Sensor

in operating mode at No alarm.

Configurable

Relay 1

Alarm 1

3

2

1

Status LED

Green/Yellow/Red

Relay status

LED Green

Service Tool

Bus_A

Field

Bus

321

Bus_B

Analog
Output

JP2*

AO_01

X12

in operating mode at No alarm.

Relay 2

Alarm 2

3

132

X2

Relays shown de-energized

open: 4-20mA

closed: 2-10 V

4

GND

2

Relay status

LED Green

X3

Local
Bus_2

Ackn.
Button

Sensor

Configurable

Relay 3

Error

Relay status

LED Green

Digital

Output

NC

567

4

X13

GND

1

Horn

X4

Flash light

Status LED:

GREEN is power on.

YELLOW is an indicator of Error.

- when the sensor head is disconnected or
not the expected type

- AO is activated but nothing connected

RED on alarm, similar to the Buzzer & light
alarm.

Ackn. -/Test button:

TEST - The button must be pressed
for 20 sec.

- Alarm1 and Alarm2 is simulated, stop
on release

ACKN. - Pressed while Alarm2, the audible
warning switches off and goes back on after
5 min. when the alarm situation is still active.

* JP2 open → AO 4 – 20 mA (Default)
JP2 closed → AO 2 – 10 Volt

NOTE:

A resistor comes installed on the analog

Danfoss

148H120_01-2018

output connections – if analog output
is used, remove the resistor.

© Danfoss | Climate solutions | 2021.06

AN272542819474en-000201 | 2

Sensor PX2

Danf
148H122_11-2018

NPT ¾ in.

Danfoss

148H121_01-2018

Danfoss Premium Uptime GDU

Power supply

Relay 1

Relay 2

Relay 3

12

0.8 Ah

12

0.8 Ah

Danf

148H147_02-2018

24 V DC

V

V

321321

24 V DC

GND

X1

ACCU

ACCU

4

Danfoss Heavy Duty GDU (ATEX, IECEx approved)

AR 01

AR 02

X2 X3 X4

NPT ¾”(ANSI B1.20.1)

Internal Thread

132 321

AR 03

90 - 240 V AC

V+ V- PE N

Power supply

90 - 240 V AC

L

24 V DC, 15 VA

oss

1

+24 V DC

2 +24 V DC

3

GND

4

BUS_A

56BUS_B

4 - 20 mA output

Service

Tool

LED

Status

Ackn. Button

Sensor

head

On board LED is similar to the display LED:

Green is power on

7

8

9

10

11

oss

Fault relais energized in
operating mode at No alarm

- Default

Alarm relais de-energized in
operating mode at No alarm

- Default (Configurable)

NPT ¾”(ANSI B1.20.1)

Internal Thread

Sensor

Yellow is an indicator of Error

- when the sensor head is disconnected or not
the expected type

- AO is activated but nothing connected
RED on alarm

On board Ackn. -/Test button:

Test: The button must be pressed
for 20 sec.

- Alarm is simulated, stop on release
Ackn.: Pressed while Alarm2, the audible

warning switches off and goes back on after
5 min. when the alarm situation is still active
(also possible over ESC button (use the

5

Location of Sensors

Gas type Relative density (Air = 1) Recommended sensor location

R717 Ammonia <1 Ceiling
R744 CO >1 Floor
R134a >1 Floor
R123 >1 Floor
R404A >1 Floor
R507 >1 Floor
R290 Propane >1 Floor

magnetic Pen).

6

© Danfoss | Climate solutions | 2021.06

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