Siemens QPL Series User manual

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

COM

7221d01/1005

COM

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

7/7

Building Technologies CC1N7221en

HVAC Products 29.08.2006

Dimensions

Dimensions in mm

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)

COM

Gas pressure

test point

Gas pressure

test point

7221m05e/0806

1/4"

QPLx2…

QPLx5…

Subject to change!

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