Siemens QPL Series User manual

CC1N7221en
27.10.2005 Building Technologies
HVAC Products
7221
QPLx2… QPLx5…/QPHx5…
Pressure Switches QPL…
QPH…
The pressure switches are used for monitoringgas orair pressures.
When the pressure falls below or exceeds the adjusted switching point, the re-
spective electrical circuitwillbe opened or changes over.
The QPL... /QPH…andthis Data Sheet are intended foruse byOEMs whichinte-
grate the pressure switches intheirproducts.
Use
•For the supervision of air or gas pressures in gas trains of gas-fired equipment (gas
burners)
•The QPL.../ QPH…are available aspressure switchesforminimum ormaximum
pressure
•Suited for pressure ranges up to 500 mbar
•Suited for gases of gas families 1,2 and 3 and otherneutral gaseousmedia

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Warning notes
To avoid injury to persons, damage to property or the environment, the following
warning notes should be observed!
Do not open,interferewith or modify the pressure switch!
•All activities (mounting,installation and service work, etc.) must be performed by
qualified staff
•Before making any wiring changes in the connection area of the switch, completely
isolate the equipment from the mains supply (all-polar disconnection)
•Ensure protection against electric shock hazard by providing adequate protection
for the connection terminals
•Each time work has been carried out (mounting, installation, service work, etc.),
checkto ensurethatwiringisinanorderly state
•Fall or shock can adversely affect the safety functions. Such unitsmust not be put
intooperation,eveniftheydo notexhibitanydamage
•Do not use the pressure switch in inflammable or explosive gas atmospheres
Engineering notes To set the required switching point, remove the cover from the pressure switch and turn
the setting knobclockwise to increase the set value,or counterclockwise todecreaseit
(see scale under«Dimensions»).Replace the coverand secureittopreventtampering.
Mounting notes
•Ensurethatthe relevantnational safetyregulationsare compliedwith
•Checkpiping connectionsandhousing of the pressure switch to ensure thatthere
are no leaks
•The pressure switch can bemounted either horizontally orvertically, but not in a
suspended position (with the scale pointing downward)
•The pressure switch can be connected via a ¼“ thread or O-ring, depending on the
type of switch (refer to «Connection via …»)
QPLx2… QPLx5…/QPHx5…
Gas pressure
test point
Mounting side
(optional)
7221z05e/1005
QPLx2… QPLx5…/QPHx5…
Fixing screws M4
O-ring
Spacers
7221z04e/0702
Gas inlets
(bottom,
optional)
Standard base
Gas pressure
test point
7221z06e/1005
Setting the
switching point
Connectionvia
¼“ (ISO) thread
Connectionvia O
-
ring

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HVAC Products 27.10.2005
Standards andcertificates
Conformityto EECdirectives
- Electromagnetic compatibility EMC (immunity)
- Directive for gas-fired appliances
- Pressure sensing devices for gas burners and gas-fired
appliances
QPLx2…
QPLx5…/QPHx5…
89 / 336 / EEC
90 / 396 / EEC
EN 1854
(CE 0063 BL 1455)
(CE 0085 BR 0021)
ISO 9001: 2000
Cert. 00739 ISO 14001: 2004 Cert. 38233
Disposalnotes
The unit contains electrical and electronic components and must not be disposed of
togetherwith domestic waste.
Local and currently valid legislation mustbe observed.
Mechanical design
-Housingmade of durable plastic with die-cast aluminium base
-Adjustable switching point
-Automatic reset
-Manual resetat QPLx2…on request
The switchingpoint(setpoint)ofthepressure switchistobe setwith theadjusting knob
locatedunder the securing cover.The pressure switch comescalibrated andhasbeen
checked forleaks.

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Type summary When ordering, please give type reference according to «Type summary».
Pressure switches with automatic reset:
Pressure range ¼“ connection O-ring connection Bauform
1.5...10 mbar QPL22.010A00 ¹) QPL12.010A00 ¹) QPLx2
2.5...50 mbar QPL22.050A00 QPL12.050A00 QPLx2
12.5...75 mbar QPL22.075A00 ¹) QPL12.075A00 ¹) QPLx2
70...280 mbar QPL22.280A00 QPL12.280A00 QPLx2
Pressure range ¼“ connection O-ring connection Bauform
0,7…3mbar QPL25.003 ¹) QPL15.003 ¹) QPLx5
2…10 mbar QPL25.010 QPL15.010 QPLx5
5…50 mbar QPL25.050 QPL15.050 QPLx5
10…150 mbar QPL25.150 QPL15.150 QPLx5
100…500 mbar QPL25.500 ¹) QPL15.500 ¹) QPLx5
Pressure range ¼“ connection O-ring connection Bauform
5...50mbar QPH25.050¹) QPH15.050 ¹) QPLx5
10...150mbar QPH25.150 QPH15.150 QPLx5
¹) On request
Connector for end switch AGA65
- Plug-in connector conforming to DIN EN 175301-803-A
- Triplepole +
- 4.5...11 mm dia./max. 1.5 mm²
Pressure switche
s
QPL… forminimum
pressure
Pressure switches
QPH…formaximum
pressure
Accessories

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Technical data Switching voltage DC /ACeffmax.250 V
Switching current
- QPLx2…
- QPLx5… / QPHx5…
ACeff max. 10 A at cosϕ1
ACeff.max.2Aatcosϕ0.5
ACeff.min.20mA
DCmax. 1 A
DC min. 20mA
ACeffmax.6Aat cosϕ1
ACeff.max.2Aatcosϕ0.5
ACeff.min.20mA
DCmax. 1 A
DC min. 20mA
Adjustable operatingpressure range 1.5...500mbar (different ranges, refer to
«Type summary»)
Operatingpressure (short-time)pressure
surge
- QPLx2…
- QPLx5… / QPHx5…
max. 600 mbar for max. 30 s
max. 1,000 mbar for max. 30 s
Operating pressure (continuously)
- QPLx2…
- QPLx5… / QPHx5…
max. 400 mbar
max. 690 mbar
Weight
- QPLx2…
- QPLx5… / QPHx5…
approx.225 g
approx.120 g
Mounting position horizontal or vertical, but not suspended
Safety class
- QPLx2…
- QPLx5… / QPHx5…
Ito VDE 0631
II toVDE0631
Degree ofprotection
- QPLx2…
- QPLx5… / QPHx5…
IP 40 (to be ensured through adequate
mounting)
IP 54
Switching pressure deviation ±15 %, referred to the setpoint
(diaphragm in vertical position)
Gasfamilies I, II,III
Typical hysteresis:
Type reference Switching differential
QPL…/ QPH…<10 mbar 0.5 mbar
QPL…/ QPH…<50 mbar 1 mbar
QPL…/ QPH…<75 mbar 3 mbar
QPL…/ QPH…>100 mbar 5 mbar
Storage DIN EN 60721-3-1
Climatic conditions class 1K3
Mechanical conditions class 1M2
Temperature range -20...+60°C
Humidity <95%r.h.
Transport DINEN60 721-3-2
Climatic conditions class 2K2
Mechanical conditions class 2M2
Temperature range -40...+60°C
Humidity <95%r.h.
Operation DINEN60721-3-3
Climatic conditions class 3K5
Mechanical conditions class 3M2
Temperature range -20...+60°C
Humidity <95%r.h.
Condensation, formation ofice and ingress ofwater are not permitted!
General data
Environmental
conditions

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Function Function with automatic reset.
Switch opens the electrical circuit when the air or gaspressure fallsbelow the set
value.
Switch opens the electrical circuit when the air or gaspressure exceeds the set value.
Connection diagram
Pressure switch for minimum pressure
When the pressure falls below the set
value, NO opens and NC closes
Pressure switch for maximum pressure
When thepressure exceedsthe set value,
NC opens and NO closes
P
COM
3
2
NO
NC
1
7221d01/1005
P
COM
3
2
NO
NC
1
7221d01/1005
QPL2… QPLx5…/QPHx5…
Connection examples QPLx5… / QPHx5… fitted to VGD20… QPLx5… / QPHx5… fitted to VGD40…
Pressure switches fo
r
minimumpressure
Pressure switches fo
r
maximum pressure
Connectionvia
connector to DIN 43650

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HVAC Products 27.10.2005
Dimensions
Dimensionsinmm
76.2
76.2
Pressure adjustment
Setting range
22.22
Standard
67.8
1/4" N.P.T. (ISO)
Pressure connection
only QPL2...
Connector to DIN 43650
21.3
7221m01e/1005
SIEMENS
47.63
95.25
50.8
Note: Dimensions for reference only
Securin g co ver for
adjusting knobs
Adjusting knobs
Securing
screw
Gaspressure
test point
Switch contacts
Gas inlets
(bottom)
Standard base
Gas inlets
(side and bottom)
optional
Mounting side (optional)
NO
COM
NC
Gas pressure
test point
Gas pressure
test point
7221m05e/1005
QPLx2…
QPLx5…/QPHx5…
©2005 Siemens Building Technol
o
gies HVAC Products GmbH
Subject to change!