B1 Series Pressure Switch
Introduction
The B1 Series Pressure Switch
incorporates a new compact design and is
well-suited to today s low and mid-range
washing machines and dishwashers
requiring single level control.
The B1 Series Pressure Switch is also
suitable for the use with either hybrid or full
electronic controls. The switch allows
quick installation and combines with high
performance for accurate fills to ensure
low water level and energy consumption,
with overflow and dry heater safety.
Design Features & Specifications
Functions Mounting
One level and one overflow protection Standard screw mounting
(optional) Snap-fixation mounting
Heater-safety contact is always present Others on demand
Levels Pressure connection position
Make pressure: 50 to 400 mm W.C. Two positions for choice
Break pressure: 20 to 350 mm W.C. Other positions for tailor-made
Differential: minimum 15 mm W.C.; maximum Operating Temperature
110 mm W.C. Maximum 85°C
Overflow pressure: 150 to 600mm W.C. Relative Humidity
Electrical ratings Maximum 95% at 40°C
ENEC and CQC Approved:
16(4) A @125/250V  Main contacts NO
Basic Switch Dimensions
4(4) A @125/250V  Main contacts NC
1(1) A @125/250V  Overflow protection
UL Approved:
16 A , 1/2HP @125/250V  Main contacts NO
4 A , 1/3HP @125/250V  Main contacts NC
1 A @125/250V  Overflow protection
Tolerance
Make/ Break Set-point: Ä…5 mm W.C. standard
Lower tolerance available on request Overflow
protection: Ä…15 mm W.C. standard
Contacts
Main contact: SPDT snap action contact
Overflow protection contact: Slow action
contact, which is normally open
Terminals
6.35 x 0.80 according to IEC 760
Group connector Rast 5/Rast 2.5
Single connector using Rast 5 Code
(Without additional isolation)
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B1 Series Pressure Switch
Socket Types
Type #1 Type #2 Type #3
Hose Connection Position
Two hose connection positions for customer choice, if you need other position in your applications, please
contact our representative.
Position #1 Position #2
Mounting types
1) Standard screw mounting 2) Snap-fixation mounting
Snap in a pocket through the ear shown as green color.
Fit to M3.5 bolt
Mounting Orientation and Set point Variation
1) Vertical 2) Horizontal Upwards 3) Horizontal Downwards
The calibration orientation is to be  diaphragm in vertical plane , unless otherwise specified; the other
orientations set point value will be converted by the table below:
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B1 Series Pressure Switch
Mounting orientation Set point Tolerance Remark
Vertical X mm w.c. Ä…5mmwc Calibration orientation
Horizontal upwards X+3 mm w.c. Ä…6mmwc
Horizontal dwonwards X-3 mm w.c. Ä…6mmwc
Notes: For higher accuracy, please let us know the mounting orientation in your applications; we will calibrate
the set point according to your mounting orientation. Consult our sales representatives for more information.
Circuitry
Circuitry Type #3:
Circuitry Type #1: Circuitry Type #2:
(Without Overflow protection)
Notes to markings:
11 COM terminal; 12 Main contact NC terminal;14 Main contact NO terminal;16 Overflow protection terminal
Ordering Instructions
B11 2 - 1 1 1 - A001
_
Hose Connect Mounting
Type Ref. Socket Type - Circuitry Customer Made
Orientation Orientation
1=Type #1 Rast 5
B11 - 1=Position #1 1=Vertical 1=Type #1 A999
Connector
2=Type #2 Rast 5 2=Horizontal
2=Position #2 2=Type #2 Factors to be consider -
Connector upwards
3=Horizontal
3=Type #3 3=Type #3
*ON/OFF Set-point
downwards
Rast 5/ Rast 2.5 (Without
Connector Overflow) *Overflow Set-point
*Other features
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