Krom Schroder DL A Series User manual

CONTENTS
Cert. Version 05.18 · Edition 02.22 · EN · 34425501
DE, EN, FR, NL, IT, ES, DA, SV, NO, PT, EL, TR, CS, PL, RU, HU – www.docuthek.com
Pressure switches for air DL..A, DL..K
1 Safety ................................1
2 Checking the usage .....................2
3 Installation ............................2
4 Wiring................................4
5 Adjustment............................5
6 Function check.........................6
7 Accessories ...........................6
8 Technical data .........................7
9 Designed lifetime .......................7
10 Certification ..........................8
11 Logistics .............................8
12 Disposal .............................8
1 SAFETY
1.1 Please read and keep in a safe place
Please read through these instructions care-
fully before installing or operating. Following the installa-
tion, pass the instructions on to the operator. This unit
must be installed and commissioned in accordance
with the regulations and standards in force. These
instructions can also be found at www.docuthek.com.
1.2 Explanation of symbols
1, 2, 3, a, b, c = Action
➔= Instruction
1.3 Liability
We will not be held liable for damage resulting from
non-observance of the instructions and non-com-
pliant use.
1.4 Safety instructions
Information that is relevant for safety is indicated in the
instructions as follows:
DANGER
Indicates potentially fatal situations.
WARNING
Indicates possible danger to life and limb.
CAUTION
Indicates possible material damage.
All interventions may only be carried out by qualified
gas technicians. Electrical interventions may only be
carried out by qualified electricians.
1.5 Conversion, spare parts
All technical changes are prohibited. Only use OEM
spare parts.
OPERATING INSTRUCTIONS

DL..A, DL..K · Edition 02.22
EN-2
2 CHECKING THE USAGE
DL1,5–3A, DL3K, DL5–150A, DL5–150K
For monitoring positive, negative or differential pres-
sures of air, flue gas or other non-aggressive gases.
This function is only guaranteed when used within the
specified limits– see page 7 (8 Technical data). Any
other use is considered as non-compliant.
2.1 Type code
DL Pressure switch for air
1,5 Adjusting range -0.5 – +1.5mbar
3Adjusting range 0.2–3mbar
5Adjusting range 0.4–5mbar
10 Adjusting range 1.0–10mbar
30 Adjusting range 2.5–30mbar
50 Adjusting range 2.5–50mbar
150 Adjusting range 30–150mbar
ARp 1/4 connection, tube connection,
hand wheel
KWith tube connection, hand wheel
TT-product
GWith gold contacts
-2 Electrical connection via screw terminals
(UL listed), IP 54
-3
Electrical connection via screw terminals, IP 54
-4 Electrical connection via screw terminals, IP 65
-5 Electrical connection via 4-pin plug,
without socket, IP 54
-6 Electrical connection via 4-pin plug, with
socket, IP 54
-9 Electrical connection via 4-pin plug, with
socket, IP 65
K2 Red/green pilot LED for 24V DC/AC
TBlue pilot lamp for 230V AC
T2 Red/green pilot LED for 110 to 230V
AC
NBlue pilot lamp for 120V AC
PWith test tapping point
1With 1 test key
2With 2 test keys
AExternal adjustment
WZ-angle bracket
2.2 Part designations
1
22
3
4
1 Upper housing section with cover
2 Lower housing section
3 Hand wheel
4 M16 cable gland/1/2" NPT conduit
2.3 Type label
DL
CE 2
13
D-49018 Osnabrück, Germany
Max. inlet pressure = withstand pressure, mains volt-
age, ambient temperature, enclosure: see type label.
3 INSTALLATION
CAUTION
Please observe the following to ensure that the
unit is not damaged during installation:
– Dropping the device can cause permanent
damage. In this event, replace the entire device
and associated modules before use.
– Use approved sealing material only.
– Condensation must not be allowed to get into
the housing. If possible, install pipework with an
ascending gradient. Otherwise, there is a risk of
icing of condensation at subzero temperatures,
the switching point shifting or corrosion in the
device which can lead to malfunctions.
– Protect the connections against dirt or moisture
in the medium to be measured or the surround-
ing air. If necessary, install a filter.
– In case of highly fluctuating pressures, install a
damping nozzle/restrictor orifice.
– When installing outdoors, place the pressure
switch in a roofed area and protect from direct
sunlight (even IP65 version). To avoid conden-
sation, the cover with pressure equalization
element can be used. See
– In the case of an uneven mounting surface,
secure the pressure switch to the mounting
plate or air duct with only two screws on the
same side in order to avoid subjecting the
pressure switch to mechanical stress.
– Vapours containing silicone can adversely affect
the functioning of electrical contacts. When
using silicone tubes, only use silicone tubes
which have been sufficiently cured.
– In the case of high humidity, we recommend
using a pressure switch with gold contact due
to its higher resistance to corrosion. Closed-cir-
cuit current monitoring is recommended under
difficult operating conditions.
➔Ensure that there is sufficient installation space.
➔Ensure unobstructed view of the hand wheel.

DL..A, DL..K · Edition 02.22
EN-3
3.1 Installation position
➔Installation in the vertical or horizontal position, or
sometimes upside down, preferably with vertical
diaphragm. If installed in a vertical position, the
switching pointp
S
will correspond to the scale
valueSK set on the hand wheel. If installed in an-
other position, the switching pointpSwill change
and no longer correspond to the set scale valueSK.
Switching pointpSmust be checked.
ps= SK SK + 0,18 mbar
[+ 0,071 "WC]
SK - 0,18 mbar
[- 0,071 "WC]
DL 3K, DL 3A
DL 1,5A
DL 5 – 150A, DL 5 – 150K
z. B. SK = -0,5:
ps= -0,5 + 0,18
ps= -0,32 mbar
3.2 Installing the DL
The following screw specifications apply when using
a (1mm thick) mounting plate and self-tapping
screws for plastic:
Hole dia./depth Screw dia./
length
DL..A.. Ø 2.7 x 8mm Ø 3.5 x 8mm
DL..A.. Ø 3.5 x 8mm Ø 4 x 8mm
DL3K Ø 2.7 x 8mm Ø 3 x 8mm
DL3K Ø 3.5 x 8mm Ø 4 x 8mm
DL5–150K Ø 3 x 16mm Ø 3.5 x 16mm
49,5 (1.9")
44,5 (1.7")
ø 2,7 x 8
(0.11
" x 0.3")
ø 3,5 x 8
(0.14" x 0.3")
ø 6,1 (ø 0.24")
DL..A: Rp ¼
(DL..AT: ¼" NPT)
DL1,5A, DL3A, DL3K
49,5 (1.9")
44,5 (1.7")
ø 2,7 x 8
(ø 0.11"x 0.3")
ø 3,5 x 8
(ø 0.14"x 0.3"
)
DL..A: Rp ¼
(DL..AT: ¼"
NPT)
DL5–150A
9,5 (0.4")
9,5 (0.4")
15,5 (0.6")
45 (1.8")
54,5 (2.1") 6 (0.2")
ø 3
x 16
(ø 0.11
" x 0.6)
64 (2.5")
DL5–150K
3.3 Connecting the pressure line
➔DL..A: upon delivery, port 2 is closed off by a rub-
ber cap.
DL1,5A, DL3A
1 = Rp 1/4(+), (1/4" NPT (+)
)
2 = ø 4,75 x 1 mm (+)
3 = ø 4,75 x 1 mm (-)
(4 = Rp 1/8(-), 1/8" NPT (-))
1
(4)
23
➔Positive pressure: port 1 or 2
➔Negative pressure: port 3
➔Special version DL3A–3Z: port 4
DL5–150A
1 = Rp 1/4(+), (1/4" NPT (+)
)
2 = ø 4,75 x 1 mm (+)
3 = ø 4,75 x 1 mm (-)
(4 = Rp 1/8(-), 1/8" NPT (-))
1
Test
2
3(4)
➔Positive pressure: port 1 or 2
➔ Negative pressure: port 3; after unscrewing port3,
also port4
DL3K
2 = ø 4,75 x 1 mm (+
)
3 = ø 4,75 x 1 mm (-)
23
➔Positive pressure: port 2
➔Negative pressure: port 3

DL..A, DL..K · Edition 02.22
EN-4
DL5–150K
2 = ø 4,75 x 1 mm (+)
3 = ø 4,75 x 1 mm (-)
(5 = ø 4,75 x 1 mm (+)
)
(5)
23
➔Positive pressure: port 2
➔Negative pressure: port 3
➔Optional test point for positive pressure: port 5
Positive pressure measurement
➔1 or 2 = positive pressure port(+).
➔If port2 is used, close off port1.
➔3 or 4 = remains open to ventilate the upper dia-
phragm chamber.
Negative pressure measurement
➔3 or 4 = negative pressure port(-).
➔ 1 or 2 = remains open to ventilate the upper dia-
phragm chamber.
Differential pressure measurement
➔ 1 or 2 = port for the higher positive pressure or
lower negative pressure(+).
➔
3 or 4 = port for the lower positive pressure or
higher negative pressure(-).
Finishing the installation
➔Seal the ports that are not in use.
4 WIRING
➔ If the pressure switch has switched a voltage >24V
(>30V) and a current >0.1A at cosφ=1 or
>0.05A at cosφ=0.6 once, the gold plating
on the contacts will have been burnt through. It
can then only be operated at this power rating or
higher power rating.
CAUTION
– To ensure that the DL is not damaged during
operation, note the switching capacity, see
page 7 (8 Technical data).
In the case of low switching capacities, such as 24V,
8mA, for example, we recommend using an RCmod-
ule (22Ω, 1μF) in air containing silicone or oil.
NO
C = 1 µF
R = 22 Ω
2
NC
1
COM
3
1 Disconnect the system from the electrical power
supply.
2 3 4
5 M16 x 1,5:
ø 4–10 mm
6 Wire as shown on the connection diagram.
7 Tighten the M16 gland) (1/2" NPT conduit).
➔ Contacts 3 and 2 close when subject to increasing
pressure. Contacts 1 and 3 close when subject
to falling pressure. With the NO contact, the NC
contact is omitted.
COM
3
NC
1
NO
2
NO
2NC
1
COM
3
L1
4.1 DL1,5A
The connection of DL1,5A depends on the positive
or negative adjusting range.
DL 1,5A
-
0
,
5
-
0
,
2
5
0
,
0
0
,
2
5
0
,
5
0
,
7
5
1
,
0
1
,
2
5
1
,
5
1
m
b
a
r
=
1
0
0
P
a
-
0
,
5
–
1
,
5
m
b
a
r
In the negative adjusting range, the template which can
be found in the unit displays the connection diagram.
NC 1
COM
COM
N
3
3
NO
2
NC
1
NO
µ
2
In the positive adjusting range, remove the template
and wire the unit as shown in the engraved connection
diagram.

DL..A, DL..K · Edition 02.22
EN-5
NO
2
NC
1
COM
3
5 ADJUSTMENT
➔The switching point is adjustable via hand wheel.
1 Disconnect the system from the electrical power
supply.
2 Unscrew the housing cover.
➔ Once the settings have been adjusted successfully,
fit the housing cover again. Note the tightening
torques, see page 7 (8 Technical data).
3 Connect an ohmmeter.
COM
3
NC
1
NO
2
NO
2
NC
1
COM
3
4 Set the switching point using the hand wheel.
5 Connect a pressure gauge.
6
0
1 cm = 1 mbar
(0.4
"= 0.4"WC)
7 Apply pressure. In doing so, monitor the switching
point on the ohmmeter and the pressure gauge.
8 If the DL..A, DL..K does not trip at the desired
switching point, correct the adjusting range using
the hand wheel. Relieve the pressure and repeat
the process.
5.1 Adjusting rangeDL..A, DL..K
Adjusting
range1)
[mbar]
Max.
inlet
pres-
sure2)
[mbar]
Mean
switching
differential3)
[mbar]
min. max. min. max.
DL1,5A -0.5 1.5 50 0.1 0.16
DL3A,
DL3K 0.2 3 50 0.1 0.16
DL3AT,
DL3KT 0.3 3 150 0.1 0.16
DL5A,
DL5K 0.4 6 300 0.2 0.3
DL5AT,
DL5KT 0.5 5 300 0.2 0.3
DL10A,
DL10K,
DL10AT,
DL10KT
1 10 300 0.25 0.4
DL30A,
DL30K 2.5 30 300 0.35 0.9
Adjusting
range1)
[mbar]
Max.
inlet
pres-
sure2)
[mbar]
Mean
switching
differential3)
[mbar]
min. max. min. max.
DL50A,
DL50K,
DL50AT,
DL50KT
2.5 50 300 0.8 1.5
DL150A,
DL150K 30 150 300 3 5
Adjusting
range1)
["WC]
Max.
inlet
pres-
sure2)
["WC]
Mean
switching
differential3)
["WC]
min. max. min. max.
DL3AT,
DL3KT 0.12 1.2 58.5 0.04 0.06
DL5AT,
DL5KT 0.2 2 117 0.08 0.12
DL10AT,
DL10KT
0.4 4 117 0.1 0.16
DL50AT,
DL50KT
1 20 117 0.3 0.6
1) Adjusting tolerance ±15% of the scale value, but min.
±4Pa [±0.016"WC].
2) Max. inlet pressure = withstand pressure.
3) Mean switching differential at min. and max. setting.
Type
Deviation from the switching
point during testing pursuant
to EN1854 Air pressure
switches
DL1,5A ±15% or ±6Pa [±0.02"WC]
DL3A, DL3K
DL3AT,
DL3KT
±15% or ±6Pa [±0.02"WC]
DL5AT–
DL50AT,
DL5KT–
50KT
±15% or ±4Pa [±0.016"WC]
DL5–150A,
DL5–150K ±15% or ±4Pa [±0.016"WC]

DL..A, DL..K · Edition 02.22
EN-6
6 FUNCTION CHECK
We recommend a function check once a year.
1 Press the test key during operation– the pressure
switch switches.
TEST +
2 In case of differential pressure, press both keys
simultaneously.
TEST
TEST
–
+
7 ACCESSORIES
7.1 Pilot lamp red/blue
Pilot lamp red
110/120V AC, I = 1.2mA, Order No.: 74920430.
230V AC, I = 0.6mA, Order No.: 74920429.
Pilot lamp blue
110/120V AC, I = 1.2mA, Order No.: 74916121.
230V AC, I = 0.6mA, Order No.: 74916122.
1 2 3
4
NC
1
COM
3
NO
NO 2
N
NO
2
NC
1
COM
3
L1
N
NC
1
COM
3
NO
NC
2
N
NO
2NC
1
COM
3
L1
N
7.2 Red/green pilot LED for 24V DC/AC or for
110V AC to 230V AC
24V DC, I = 16mA; 24V AC, I = 8mA, Order No.:
74921089.
110V AC to 230V AC, Order No.: 74923275.
1 2 3
4
NC
1
COM
3
NO
2
N
NO
21 NC
3 COM
+
–
Further information on accessories can be found here:
www.docuthek.com – Technical Information – Ac-
cessories.

DL..A, DL..K · Edition 02.22
EN-7
8 TECHNICAL DATA
8.1 Ambient conditions
Enclosure to IEC 60529: IP54 (IP65).
Permitted ambient temperature in operation:
DL..A, DL..K: -20 to +80°C (-4 to +176°F),
DL..T: -40 to +60°C (-40 to +140°F).
Storage and transport temperatures:
-20 to +40°C (-4 to +104°F).
Micro switch to EN61058-1.
Gas types: air or flue gas, no flammable gases, no
aggressive gases.
Icing, condensation and dew in and on the unit are
not permitted.
Safety class II to VDE0106-1.
This unit is not suitable for cleaning with a high-pres-
sure cleaner and/or cleaning products.
8.1.1 Pressure switch with NBR diaphragm
Long-term use in the upper ambient temperature range
accelerates the ageing of the elastomer materials and
reduces the service life (please contact manufacturer).
Ozone concentrations exceeding 200μg/m3accel-
erate the ageing of elastomer materials and reduce
the service life.
8.2 Mechanical data
Medium temperature = ambient temperature.
Max. inlet pressure pmax. = withstand pressure,
switching differential, see page 5 (5.1 Adjusting
rangeDL..A, DL..K).
Diaphragm pressure switch, NBR, silicone-free.
Housing: glass fibre reinforced PBT plastic with low
gas release.
Weight: DL..A: 190 g (6,7 oz), DL..K: 220 g (7,8 oz)
Recommended tightening torque:
Component
Tightening
torque
[Ncm]
Cover screws 65
M16 x 1.5 cable gland 50
Clamping terminal screws 80
Rp 1/8 connection on upper
housing section 250
Rp 1/4 (1/4"NPT) connection on
lower housing section 600
8.3 Electrical data
Line entrance: M16 x 1.5 (1/2" NPT conduit),
clamping range: diameters of 4 to 10mm.
Type of connection: screw terminals,
cable diameter: 0.5 to 1.8mm (AWG24 to
AWG13).
8.3.1 Switching capacity
UI
(cosφ=1)
I
(cosφ=0.6)
DL 24–
250VAC 0.05–5A 0.05–1A
DL..G
5–250VAC 0.01–5A 0.01–1A
DL..G 5–48VDC 0.01–1A 0.01–1A
DL..T 30–
240VAC 5A 0.5A
DL..TG < 30V AC/
DC 0.1A 0.05A
Contact gap <3mm (μ).
If the pressure switch has switched a voltage >24V
(>30V) and a current >0.1A at cosφ=1 or
>0.05A at cosφ=0.6 once, the gold plating on
the contacts will have been burnt through. It can
then only be operated at this power rating or higher
power rating.
9 DESIGNED LIFETIME
This information on the designed lifetime is based on
using the product in accordance with these operat-
ing instructions. Once the designed lifetime has been
reached, safety-relevant products must be replaced.
Designed lifetime (based on date of manufacture) in
accordance with EN13611, EN1854 for DL..A, DL..K:
10 Jahreyears.
You can find further explanations in the applicable
rules and regulations and on the afecor website (www.
afecor.org).
This procedure applies to heating systems. For ther-
moprocessing equipment, observe local regulations.

DL..A, DL..K · Edition 02.22
EN-8
10 CERTIFICATION
Declaration of conformity
We, the manufacturer, hereby declare that the products
DL..A, DL..K with product ID No. CE- 0085AP0466
comply with the requirements of the listed Directives
and Standards.
Directives:
– 2014/35/EU – LVD
– 2014/30/EU – EMC
– 2011/65/EU – RoHS II
– 2015/863/EU – RoHS III
Regulation:
– (EU) 2016/426 – GAR
Standards:
– EN1854:2010
The relevant product corresponds to the tested type
sample.
The production is subject to the surveillance proce-
dure pursuant to Regulation (EU) 2016/426 AnnexIII
paragraph3.
Elster GmbH
Scan of the Declaration of conformity (D,GB)– see
www.docuthek.com
10.1 FM and AGA approval, UL listing, Eurasian
Customs Union, RoHS compliant
AGA
10.2 REACH Regulation
The device contains substances of very high concern
which are listed in the Candidate List of the European
REACH Regulation No.1907/2006. See Reach list
HTS at www.docuthek.com.
10.3 China RoHS
Directive on the restriction of the use of hazardous sub-
stances (RoHS) in China. Scan of the Disclosure Table
China RoHS2, see certificates at www.docuthek.com.
11 LOGISTICS
Transport
Protect the unit from external forces (blows, shocks,
vibration).
Transport temperature: see page 7 (8 Technical
data).
Transport is subject to the ambient conditions de-
scribed.
Report any transport damage on the unit or packaging
without delay.
Check that the delivery is complete.
Storage
Storage temperature: see page 7 (8 Technical data).
Storage is subject to the ambient conditions described.
Storage time: 6months in the original packaging before
using for the first time. If stored for longer than this, the
overall service life will be reduced by the corresponding
amount of extra storage time.
12 DISPOSAL
Devices with electronic components:
WEEE Directive 2012/19/EU – Waste Electrical
and Electronic Equipment Directive
At the end of the product life (number of op-
erating cycles reached), dispose of the pack-
aging and product in a corresponding recycling
centre. Do not dispose of the unit with the usu-
al domestic refuse. Do not burn the product.
On request, old units may be returned carriage paid
to the manufacturer in accordance with the relevant
waste legislation requirements.
© 2022 Elster GmbH We reserve the right to make technical modifications in the interests of progress.
The Honeywell Thermal Solutions family of products includes
Honeywell Combustion Safety, Eclipse, Exothermics, Hauck,
Kromschröder and Maxon. To learn more about our products, visit
ThermalSolutions.honeywell.com or contact your Honeywell Sales
Engineer.
Elster GmbH
Strotheweg 1, D-49504 Lotte
T [phone]
[email protected]
www.kromschroeder.com
Global centralized service deployment coordination:
T [phone] or -555
[email protected]
Translation from the German
FOR MORE INFORMATION