Siemens QP Series Owner's manual

Siemens Building Technologies, Inc.

QP Series
Technical Instructions
Document No. 155-292
November 11, 2002
Pressure Switches for Gas and Air
GAS0047R1
mbar
LG
Description QP… pressure switches are used for gas and air pressure supervision on industrial and
commercial burner applications.
The QPL31… series pressure switches break the electrical circuit when the pressure
drops below the adjusted value.
The QPH31… series pressure switches break the electrical circuit when the pressure
increases above the adjusted value.
Features • UL listed for USA and Canada, FM approved, ISO 9001 certified;
European approved versions available.
• Adjustable pressure range from 1 to 112 inches water column (WC).
• Automatic and manual reset models.
• Surge protected up to 15 psi.
Product Numbers Table 1.
Pressure Range
Product Number Inches Water
Column (WC) mbar Execution
QPL31.050M00 1 to 20 2.5 to 50
QPL31.140M00 7 to 55 17.5 to 137 Manual Reset Low
QPH31.050M00 2 to 20 5 to 50
QPH31.150M00 10 to 60 25 to 150 Manual Reset High
QPL31.050A00 1 to 20 2.5 to 50
QPL31.075A00 5 to 30 12.5 to 75
QPL31.280A00 28 to 112 70 to 280
Automatic Reset Low
QPH31.050A00 2 to 20 5 to 50
QPH31.090A00 5 to 35 12.5 to 87
QPH31.280A00 28 to 112 70 to 280
Automatic Reset High

Technical Instructions QP Series Pressure Switches for Gas and Air
Document Number 155-292
November 11, 2002
Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as
design improvements are introduced. Other product or company names mentioned herein may be the trademarks of their respective owners.
© 2002 Siemens Building Technologies, Inc.
U.S.A.
Document No. 155-292
Printed in the U.S.A.
Page 2
Specifications Electrical rating
Maximum operating pressure
Maximum surge pressure
Operating temperature
10A @ 125 to 250 Vac
1/3 HP @ 125 to 250 Vac
6 psi (400 mbar)
15 psi (1 bar) for 2 seconds
–40°F to 140°F (–40°C to 60°C)
Operation
Range Adjustment Remove the cover to adjust the pressure cut-off setting. Turn the range dial clockwise to
increase the pressure setting, or counterclockwise to decrease the pressure setting.
Manual reset models If the yellow ring of the reset button is above the cover, the switch is in the open position
and must be manually reset before continuing burner operation.
Wiring NOTE: Wiring must be performed by a licensed electrician.
COM
NC
NO
P
LOW
PRESSURE
MODEL
GAS0043R1
Figure 1. Typical Wiring for Low
Pressure Models.
COM
NC
NO
P
HIGH
PRESSURE
MODEL
GAS0044R1
Figure 2. Typical Wiring for High
Pressure Models.
Mounting • All switches can be mounted in either a horizontal or vertical position.
• All models have a 1/4-inch NPT female pressure connection on the metal base.
• Check connections for leakage after installation.
Dimensions
10
25
2
3
20
50
5
13
15
37
mbar
LG
INCH
W.C.
3.00"
(76.2 mm)
3.00"
(76.2 mm)
GAS0046R1
2.67"
(67.8 mm)
1/4" N.P.T. (Female)
Gas Inlet
Yellow
Ring
∅.88" (22.22 mm)
(1/2" Connection)
(Manual Reset
Models Only)
Reset Button
.40"
(10.16 mm)
GAS0045R1

Represented By:
POWER EQUIPMENT COMPANY
2011 Williamsburg Road
Richmond, VA 23231
Ph. 804-236-3800
Fx. 804-236-3882
www.peconet.com