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• <br /> Chapter 2 — Components <br /> Page 2 -10 <br /> REV. 2 <br /> •STAINLESS STEEL PRESSURE SWITCHES <br /> ACTUATION HOSE <br /> The Stainless Steel Actuation Hose is used to connect the actu- Model PS -SPDT XP. <br /> ation line compression tees and can also be connected end to <br /> end. The hose has the same thread, 7/16 -20, as the fittings. The Model PS- SPDT -XP is an explosion proof (NEMA 4; 7; <br /> See Figure 2 -22. 9) electrical pressure switch which can be field mounted in <br /> Hose Part No. Length ■ the discharge piping as shown in Figure 2 -23. The switch is <br /> UL Listed (CCN: NOWT) and must be installed in accor- <br /> 417582 8 in. (20 cm) dance with the instructions contained with the switch and <br /> 31809 16 in. (41 cm) this manual The switch provides one set of NO /NC dry con - <br /> 32336 24 in. (61 cm) tacts. It is intended for use with electric power shut -off <br /> 430815 42 in. (107 cm) devices (dealer supplied), electric gas valves, alarms, bells, <br /> Fitting lights, contactors, and other electrical devices designed to <br /> Part No. Description shut off or turn on upon system actuation. It is rated for 15 <br /> 31810 Male Elbow (7/16 -20 x 1/4 in. NPT) amps @ 125/250 VAC. <br /> 31811 Male Tee (7/16 -20 x 7/16 -20 x 1/4 in. NPT) <br /> 32338 Male Straight Connector (7/16 -20 x 1/4 in. NPT) <br /> 1?5 4 1 4 4 ,. , . 31 a 6 la 0 Alt,ito n <br /> 7/16 -20 7/16 -20 <br /> Figure 2 -22. Stainless Steel Actuation Hose. IN <br /> 000433 <br /> ► <br /> PIPE & FITTINGS .. 12 IN. (30.Scm) <br /> MAXIMUM 12 TO 15 IN, <br /> (30.5 to 38.1 cm) <br /> Pipe and fittings must be furnished by the installer. ; <br /> Schedule 40 black, galvanized, chrome plated, or stainless <br /> steel pipe must be used. Standard weight malleable, galva- <br /> nized, chrome plated, or stainless steel fittings must also be A, lei m" <br /> used. <br /> lill <br /> Figure 2 -23. Pressure Switch Piping. <br /> 003025PC <br /> ► PRESSURE BLEED DOWN <br /> ADAPTOR ASSEMBLY <br /> The Pressure Bleed Down Adaptor Assembly, Part No. 551736, <br /> is required to open the valve stem on the tank when bleeding <br /> the tank down for six -y year maintenance. See Figure 2 -24. <br /> 7� % am � :w'� ` ~� <br /> �- ) <br /> \\\,, ,----________ \ \ , <br /> i <br /> Figure 2 -24. Pressure Bleed Down Adaptor Assembly. <br /> ► 004265 <br /> ULEX 3437 CEx732 <br /> March 17, 2004 <br />