User's Manual

Component Descriptions
September 2013 2-64 P/N 81-CO2MAN-001
2-8.1 Pressure Operated Switches
Pressure operated switches (Figure 2-68 and Figure 2-69) are connected to the distribution
piping and utilize the pressure of the discharging carbon dioxide for activation. The carbon
dioxide actuates a pressure operated stem which toggles the electrical switch. Each switch can
also be operated manually by pulling up on the stem. These switches are used to enunciate
alarms, to shut down ventilation and/or other electrical equipment and to turn on electrical
automatic dampers or other electrical equipment. Each pressure switch must be manually
reset, by pushing down on the stem to return the switch to the set position. The minimum
operating pressure required is 50 PSI.
Pressure switches are available in standard (Part No. 81-486536-000) and explosion proof
(Part No. 81-981332-000) models. The standard switch is three-pole, double-throw; the
explosion proof switch is three-pole, single-throw.
Figure 2-68. Pressure Operated Switch
PRESSURE OPERATED SWITCH
3P.D.T.
U
L
FM
R
Kidde
4 in.
(102 mm)
4 in.
(102 mm)
OPERATED
SET
(4) 1/4 in. MOUNTING
HOLES
OPERATED
SET
STEM SHOWN IN SET POSITION -
PULL UP ON STEM TO MANUALLY
OPERATE SWITCH
3/8 in.
(8) COVER SCREWS
TO RESET
PUSH STEM TO SET POSITION
15 AMP 125 VAC
10 AMP 250 VAC
3/4 HP 1-2-3 PH 125-480 VAC
1/2 in. SUPPLY PIPE WITH UNION
SWITCH 3PDT
COVER
GASKET
FRONT VIEW
COVER REMOVED
FRONT VIEW
SIDE SECTION
1/2 in. NPT FEMALE -
CONNECT TO SYSTEM PIPING
BOX
(3) 1/2 in. CONDUIT KNOCKOUTS
EACH SIDE
WIRING
SCREW
TERMINALS