Siemens QPL Series Manuale utente
CC1N7221en
29.08.2006
Building Technologies
HVAC Products
7221
QPLx2… QPLx5…
Pressure Switches QPL…
The pressure switches are used for monitoring gas or air pressures.
When the pressure falls below or exceeds the adjusted switching point, the re-
spective electrical circuit will be opened or changes over.
The QPL... and this Data Sheet are intended for use by OEMs which integrate the
pressure switches in their products.
Use
•For the supervision of air or gas pressures in gas trains of gas-fired equipment (gas
burners)
•The QPL... are suitable as pressure switches for minimum or maximum pressure
•Suited for pressure ranges up to 500 mbar
•Suited for gases of gas families 1, 2 and 3 and other neutral gaseous media
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Building Technologies CC1N7221en
HVAC Products 29.08.2006
Warning notes
To avoid injury to persons, damage to property or the environment, the following
warning notes should be observed!
Do not open, interfere with 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.),
check to ensure that wiring is in an orderly state
•Fall or shock can adversely affect the safety functions. Such units must not be put
into operation, even if they do not exhibit any damage
•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 knob clockwise to increase the set value, or counterclockwise to decrease it
(see scale under «Dimensions»). Replace the cover and secure it to prevent tampering.
Mounting notes
•Ensure that the relevant national safety regulations are complied with
•Check piping connections and housing of the pressure switch to ensure that there
are no leaks
•The pressure switch can be mounted either horizontally or vertically, 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 also to following Mounting Instructions:
QPLx5… →M7221 →74 319 0551 0
QPL22… QPL25…
Gas pressure
test point
Mounting side
(optional)
7221z05e/1005
QPL12… QPL15…
Fixing screws M4
O-ring
Spacers
7221z04e/0702
Gas inlets
(bottom,
optional)
Standard base
Gas pressure
test point
7221z06e/1005
Setting the
switching point
Connection via
¼“ (ISO) thread
Connection via O-ring
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Building Technologies CC1N7221en
HVAC Products 29.08.2006
Standards and certificates
Conformity to EEC directives
- Electromagnetic compatibility EMC (immunity)
- Directive for gas-fired appliances
- Pressure sensing devices for gas burners and gas-fired
appliances
QPLx2…
QPLx5…
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
Disposal notes
The unit contains electrical and electronic components and must not be disposed of
together with domestic waste.
Local and currently valid legislation must be observed.
Mechanical design
-Housing made of durable plastic with die-cast aluminium base
-Adjustable switching point
-Automatic reset
-Manual reset at QPLx2… on request
The switching point (setpoint) of the pressure switch is to be set with the adjusting knob
located under the securing cover. The pressure switch comes calibrated and has been
checked for leaks.
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Building Technologies CC1N7221en
HVAC Products 29.08.2006
Type summary When ordering, please give type reference according to «Type summary».
Pressure switches with automatic reset:
Pressure range ¼“ connection O-ring connection Type
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…
¹) On request
Pressure range ¼“ connection O-ring connection Type
0,7…3 mbar QPL25.003 QPL15.003 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 QPL15.500 QPLx5…
Connector for end switch AGA65
- Plug-in connector conforming to DIN EN 175301-803-A
- Triple pole +
- 4.5...11 mm dia. / max. 1.5 mm²
Accessories
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Building Technologies CC1N7221en
HVAC Products 29.08.2006
Technical data Switching voltage DC / ACeff max. 250 V
Switching current
- QPLx2…
- QPLx5…
ACeff max. 10 A at cosϕ1
AC eff. max. 2 A at cosϕ0.5
AC eff. min. 20 mA
DC max. 1 A
DC min. 20 mA
ACeff max. 6 A at cosϕ1
AC eff. max. 2 A at cosϕ0.5
AC eff. min. 20 mA
DC max. 1 A
DC min. 20 mA
Adjustable operating pressure range 1.5... 500 mbar (different ranges, refer to
«Type summary»)
Operating pressure (short-time) pressure
surge
- QPLx2…
- QPLx5…
max. 600 mbar for max. 30 s
max. 1,000 mbar for max. 30 s
Operating pressure (continuously)
- QPLx2…
- QPLx5…
max. 400 mbar
max. 690 mbar
Weight
- QPLx2…
- QPLx5…
approx. 225 g
approx. 120 g
Mounting position horizontal or vertical, but not suspended
Safety class
- QPLx2…
- QPLx5…
Ito VDE 0631
II to VDE 0631
Degree of protection
- QPLx2…
- QPLx5…
IP 40 (to be ensured through adequate
mounting)
IP 54
Switching pressure deviation ±15 %, referred to the setpoint
(diaphragm in vertical position)
Gas families I, II, III
Typical hysteresis:
Type reference Switching differential
QPL… < 10 mbar 0.5 mbar
QPL… < 50 mbar 1 mbar
QPL… < 75 mbar 3 mbar
QPL… > 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 DIN EN 60 721-3-2
Climatic conditions class 2K2
Mechanical conditions class 2M2
Temperature range -40...+60 °C
Humidity < 95 % r.h.
Operation DIN EN 60 721-3-3
Climatic conditions class 3K5
Mechanical conditions class 3M2
Temperature range -20...+60 °C
Humidity < 95 % r.h.
Condensation, formation of ice and ingress of water are not permitted!
General data
Environmental
conditions
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Building Technologies CC1N7221en
HVAC Products 29.08.2006
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 the pressure exceeds the 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
QPLx2… QPLx5…
Connection examples QPLx5… fitted to
VGD20…4011 / VGD20.5011 QPLx5… fitted to VGD40…
Function when
Connection via
connector to DIN 43650
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Building Technologies CC1N7221en
HVAC Products 29.08.2006
Dimensions
Dimensions in mm
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
Securing cover for
adjusting knobs
Adjusting knobs
Securing
screw
Gas pressure
test point
Switch contacts
Gas inlets
(bottom)
option
Standard base
Gas inlets
(side and bottom)
optional
Mounting side (optional)
NO
COM
NC
Gas pressure
test point
Gas pressure
test point
7221m05e/0806
1/4"
QPLx2…
QPLx5…
©2006 Siemens Building Technologies HVAC Products GmbH
Subject to change!
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