Siemens QP Series User 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

Siemens QP Series Specifications

General

Type	Circuit Breaker
Interrupting Rating	10kA
Series	QP
Poles	1 or 2
Standards	UL Listed

Summary

QP Series Pressure Switches

Description

QP... pressure switches are used for gas and air pressure supervision on industrial and commercial burner applications.

Features

UL listed for USA and Canada, FM approved, ISO 9001 certified; European approved versions available.

Product Numbers

Lists product numbers with corresponding pressure ranges in inches water column and mbar, and execution type.

Specifications

Electrical Rating

Specifies the electrical rating for the switches as 10A @ 125 to 250 Vac and 1/3 HP @ 125 to 250 Vac.

Maximum Operating Pressure

Defines the maximum operating pressure for the QP series switches as 6 psi (400 mbar).

Operating Temperature

Specifies the operating temperature range for the switches from -40°F to 140°F (-40°C to 60°C).

Operation

Range Adjustment

Instructions on how to adjust the pressure cut-off setting using the range dial.

Manual Reset Models

Details on the manual reset procedure for switches with a yellow ring on the reset button.

Mounting and Wiring

Mounting Options

Switches can be mounted horizontally or vertically; feature a 1/4-inch NPT female pressure connection.

Wiring Requirements

Wiring must be performed by a licensed electrician; illustrates typical wiring for low and high pressure models.