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Environmental & Combustion Controls
C645A2004
Pressure Switch, Manual Rest, SPDT break on pressure fall

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Overview
Pressure switches are safety devices used in positive-pressure or differential-pressure systems to sense gas or air pressure changes.

This product is obsolete. It can be purchased while supply lasts, or you can look for a replacement in the cross-reference.
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Features

• C645A,B models are for use on natural gas, LP gas, or air.
• C645B1047 includes a scaleplate stop to meet American Gas Association (AGA) requirements for gas-fired boilers with inputs over 2-1/2 million Btuh.
• C645C,D models are for use on air only.
• C645E for use with distillate fuel oil.
• Spring-loaded diaphragm actuates snap-acting Micro Switch. Switch can be wired to turn on alarm.
• C645A,C and D models break control circuit on pressure fall.
• C645B models break control circuit on pressure rise.
• Lockout and manual reset optional in A and C models.
• Removable, zinc-plated cover protects scaleplate and adjusting screw.
• Lockout models have external manual reset lever.
• Pipe tapings allow selection of positive pressure, differential-pressure, or venting connections.
• Optional switch position indicator available.
• Models of C645A,B available with cover window for setpoint visibility.
• Buna-N fiber-reinforced material for increased control diaphragm strength.
• Two seal-off diaphragms for added reliability.
Product Specifications  Back To Top
Description Pressure Switch, Manual Rest, SPDT break on pressure fall
Application Natural Gas, Liquid Propane (LP) or Air Switch
Operating Range (psi) 3 to 21 in. wc
Operating Range (kPa) 0.7 to 5.2 kPa
Mounting 1/4 in. NPT internal thread
Switch Operation Manual Reset
Switching Action SPDT break on pressure fall
Sensor Element BUNA N Diaphragm
Pipe Connections, Main or High Pressure 1/4 in. NPT internal thread
Pipe Connections, Vent or Low pressure 1/8 in. NPT internal thread
Dimensions (in.) 4 3/4 in. diameter x 3 1/2 in. deep
Dimensions (mm) 121 mm diameter x 89 mm deep
Alternate Ratings Ignition Transformer: 540 VA, Pilot Valve: 50 VA. Main Valve: 250 VA with 10 times inrush, 400 VA with 2-1/2 times inrush
Switch Contact Ratings (120 Vac) 7.4 AFL, 44.4 ALR
Switch Contact Ratings (240 Vac) 3.7 AFL, 22.2 ALR
Maximum Sustained Operating Pressure (psi) 5.0 psi
Maximum Sustained Operating Pressure (kPa) 34.5 kPa
Temperature Range (F) -20 F to +125 F
Temperature Range (C) -29 C to +52 C
Electrical Connections Screw terminals
Nominal Pressure Differential (psi) 1.0 in. wc
Nominal Pressure Differential (kPa) 0.2 kPa
Maximum Pressure Differential (psi) 3.0 in. wc
Maximum Pressure Differential (kPa) 0.7 kPa
Approvals, Underwriters Laboratories Inc Listed: File No. MP2168, Guide No. MFHX
Approvals, Canadian Standards Association Certified: File No. LR1620, Guide No. 140-A-2
Approvals, Factory Mutual Approved: Report No. 19268, 13233-S3
Approvals, Swiss RE (formerly IRI) Acceptable
Includes Position indicator, cover window, and meet ANSI miswiring requirements

Literature and other Resources Download Back To Top
Product Data - (C645A Pressure Switches)
Gas/Air/ Fuel Oil Pressure Swutch Cover Off(Photo_BW - Web Quality Image)
Gas/Air/ Fuel Oil Pressure Swutch Cover Off(Photo_BW - Print Quality Image)
Gas/Air/Fuel Oil Pressure Switch Cover Off(Photo_BW - Web Quality Image)
Gas/Air/Fuel Oil Pressure Switch Cover Off(Photo_BW - Print Quality Image)
Gas/Air/Fuel Oil Pressure Switch Cover Off(Photo_BW - Web Quality Image)
Gas/Air/Fuel Oil Pressure Switch Cover Off(Photo_BW - Print Quality Image)
C645A Gas Pressure Switch 3 inch Main(Photo_BW - Web Quality Image)
C645A Gas Pressure Switch 3 inch Main(Photo_BW - Print Quality Image)
C645A Gas Pressure Switch 6 inch Main(Photo_BW - Web Quality Image)
C645A Gas Pressure Switch 6 inch Main(Photo_BW - Print Quality Image)
C645A Gas Pressure Switch 3 inch Main(Photo_Color - Web Quality Image)
C645A Gas Pressure Switch 3 inch Main(Photo_Color - Print Quality Image)
C645A Gas Pressure Switch 6 inch Main(Photo_Color - Web Quality Image)
C645A Gas Pressure Switch 6 inch Main(Photo_Color - Print Quality Image)
C645A Gas or Air Pressure Switch Dimension Diagram Dimension(LineArt)
C645A Gas or Air Pressure Switch Dimension Diagram Dimension(LineArt - Web Quality Image)
C645B Gas Pressure Switch 3 inch Main(Photo_BW - Web Quality Image)
C645B Gas Pressure Switch 3 inch Main(Photo_BW - Print Quality Image)
C645B Gas Pressure Switch 6 inch Main(Photo_BW - Web Quality Image)
C645B Gas Pressure Switch 6 inch Main(Photo_BW - Print Quality Image)
C645B Gas Pressure Switch 3 inch Main(Photo_Color - Web Quality Image)
C645B Gas Pressure Switch 3 inch Main(Photo_Color - Print Quality Image)
C645B Gas Pressure Switch 6 inch Main(Photo_Color - Web Quality Image)
C645B Gas Pressure Switch 6 inch Main(Photo_Color - Print Quality Image)
C654C, D Air Pressure Switch Dimension Diagram Dimension(LineArt)
C654C, D Air Pressure Switch Dimension Diagram Dimension(LineArt - Web Quality Image)
Pressure Switch Main(Photo_BW - Web Quality Image)
Pressure Switch Main(Photo_BW - Print Quality Image)
Pressure Switch Main(Photo_BW - Web Quality Image)
Pressure Switch Main(Photo_BW - Print Quality Image)
Pressure Switches Wiring(LineArt)
Pressure Switches Wiring(LineArt - Web Quality Image)
Pressure Switches Wiring(LineArt)
Pressure Switches Wiring(LineArt - Web Quality Image)
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