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S-SERIES Combustion Switches

Pressure Switches Designed to ULor FM Requirementsfor Combustion Service

Features:

? Set point repeatability, + 1% of operating range.? ULListed in the gas and oil equipment list. ? FM Approved as “pressure supervisory switches.” ? Externally visible pressure setting scales. ? External adjusting nuts. ? Choice of fixed or full-range adjustable deadbands. ? Choice of single or two-stage units. ? Mounts in any position. ? Rugged and vibration resistant. ? Separate electrical, pressure and adjusting chambers.? Mix and match switch and transducer components for increased stock flexibility or to change pressure ranges in field.? Withstands high surge pressures.

General Description:

ASCO S-Series combustion switches consist of a switch unit and a transducer unit. They can be ordered separately for customer stocking and/or field assembly or as a complete factory-assembled unit.

Standard Electrical Ratings Standard Temperature Ratings

SB and SC Series

Switch

5 Amp Res., 125, 250 VAC 1/4 HP, 125 VAC 1/2 HP, 250 VAC .4 Amp Res., 125, VDC
1 S-Series combustion switch units incorporate the unique ASCO TRI-POINTalternating fulcrum balance plate to control the operation of one or more electrical snap-action swtiches. The electrical snap-action switch together with the adjusting mechanism is a fully-tested, self-contained subassembly. SA, SD and SE Series Ambient: 5 Amp Res., 125, 250 VAC 1/8 HP, 125 VAC 1/4 HP, 250 VAC 1/2 Amp Res., 125 VDC 1/4 Amp Res., 250 VDC -4°F (-20°C) to 140°F (60°C)
SPDT Fluid: For Buna “N” or Neoprene Diaphragm-4°F (-20°C) to 180°F (82°C) For Viton Diaphragm -4°F (-20°C) to 250°F (121°C) For 316 SS Diaphragm -50°F (-45°C) to 300°F (149°C)
NONCC

Transducer

Transducer unit incorporates a diaphragm/piston type pressure sensor, and is also a fully-tested, self-contained subassembly.
1 SD and SE Series not FM Approved.

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Operation

Pressure/Temperature Switch Catalog (506) - 181 #

When pressure is applied to the transducer it is converted into movement of the piston. This piston movement is then used to control the operation of the electrical snap-action switch in the switch unit.

Options

(See pages 34-35 )

Dimensions

(See page 15 )
20