System Sensor OSYEXP - Manual

D770-27-00 1 I56-1429-002R
OSYEXP Explosion Proof
Gate Valve Supervisory Switch
INSTALLATION AND MAINTENANCE INSTRUCTIONS
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
www.systemsensor.com
Important
Please Read Carefully And Save
This manual contains important information about the
installation and operation of supervisory switches. These
instructions apply to System Sensor switches for outside
screw and yoke valves only. Read all instructions carefully
before beginning installation.
CAUTION
To prevent ignition of hazardous atmospheres, disconnect
supply circuit before opening. Keep assembly tightly closed
when in operation. Do NOT leave unused wires exposed.
All supervisory switch installations must comply with local
codes and ordinances and the requirements of the author-
ity having jurisdiction. Additional information is available
in National Fire Protection Association standards NFPA 13,
13D, 13R, 71, and 72.
General Installation Considerations
The OSYEXP Supervisory Switch can be mounted on open
yoke valves between
1 /
2
″ and 12″ in diameter. The switch
is designed to supervise the open condition of the OS & Y
Gate Valve in hazardous locations.
All OSYEXP models are equipped with a ground screw
inside the switch housing for those applications where
grounding is required.
Narrow Yoke Valves
As Figure 1 suggests, installing the valve with mounting
bolts inside the yoke is recommended. However, some
valves may have yokes that are too narrow for this arrange-
ment. If this is the case, the bolts can be positioned on the
outside of the yoke.
Limited Clearance Valves
The OSYEXP mounting bracket fits most of the open yoke
valves used in fire protection systems. However, some of
these valves, especially those less than 1
1 /
2
″ in diameter,
have irregularly shaped yokes or such limited clearances
that the clamping bar cannot be installed properly and/or
it causes the valve to bind. If this is the case, the use of
the supplied J-bolts is required to attach the OSYEXP to the
valve (see J-Bolt Detail, Figure 1).
Installation Procedure
See Figures 2 and 3, as required, while performing the pro-
cedure that follows.
Perform step 1 on valves 1
1 /
2
″ in diameter and smaller
only. Proceed directly to step 2 if the switch is being
installed on a valve larger than 1
1 /
2 ″ in diameter.
1. Remove and discard the two C-clips and roller from the
actuating lever.
2. Set the valve to its fully open position. Remove the
OSYEXP Supervisory Switch from the carton and adjust
the position of the retaining washers to provide suffi-
cient bolt length for the yoke thickness of the valve.
Specifications
Contact Ratings:
One SPDT (Form C) Switch
15 A @ 125/250/480 VAC; 1/8 HP @ 125 VAC, 1/4 HP @ 250 VAC
1/2 A @ 125 VDC; 1/4 A @ 250 VDC
Dimensions: 7″L X 3.125″D X 4.875″H
Maximum Stem Extension: 2.875″
Bracket Span:
7″
Operating Temperature Range: –40° - 160°F (–40°C – 71°C)
Shipping Weight:
2-1/4 lb.
Enclosure Rating: UL Listed explosion proof switch enclosure for use in hazardous locations.
Class I, Groups C and D; Class II, Groups E. F and G