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JH-DC OPERATOR INSTALLATION GUIDE
GENERAL PRODUCT INFORMATION
PRODUCT APPLICATION
OSCO’s Model JH-DC jackshaft operator will electrically operate service doors, rolling grilles, sectional vertical-lift doors, and
sectional high-lift doors (minimum 24 inches of high lift), via DC power with battery back-up capability.
MECHANICAL FEATURES
The Model JH-DC jackshaft operator may be mounted in a variety of positions (see Figure 1 on next page). The operator may be
equipped with an optional hand chain hoist mechanism in addition to battery back-up in case of power failure. The hand chain
should be pre-installed and will operate in the vertical mounting position. A disconnect cable is supplied for engaging the hand
hoist from the floor level. Model JH-DC jackshaft operator is designed to operate a maximum pull of 90 lbs, and is rated for 15 full
cycles of operation per hour maximum.
The motor may be removed without affecting either the limit switch adjustment or optional hand chain operation.
A standard operator is supplied with 5 feet of #41 roller chain, a 16-tooth drive sprocket, and a 36-, 48- or 60-tooth sprocket.
Other drive sprockets are available.
REDUCTION. The speed reduction is achieved by means of heavy-duty sprockets and a roller chain, which has been prelubricated
at the factory.
LIMIT SWITCHES. The limit switches are actuated by rotary motion of a shaft driving a threaded limit nut and are fully adjustable
over a wide range.
ELECTRICAL FEATURES
The standard operator is wired for control by an OPEN-CLOSE-STOP push-button station with constant contact on the OPEN
and CLOSE buttons. The constant contact feature can be turned on and off via dip switch selection. The operator also can be
controlled either open or closed by optional 24 volt, three-wire radio, pull cord, or single-button station.
INSTALLATION INSTRUCTIONS
PREPARATION
Unpack the carton, checking for possible damage during shipping. Damage claims must be filed with the freight carrier. The
following parts are included in the carton:
(1) Model JH-DC Operator
(2) Spreader Arms (Optional)
(1) Cable-Retaining Bracket
(1) #41 Chain, 5’
(1) #41 Master Link
(1) Set Collar, 1”
(1) Hand Chain (length to order)
(1) Cable (length to order)
(1) of the following sprockets:
Door Sprocket, 41 B 60, 1” Bore, with Key and Set Screw (size to order)
Door Sprocket, 41 B 48, 1” Bore, with Key and Set Screw (size to order)
Door Sprocket, Standard, 41 B 36, with Key and Set Screw (size to order)
(1) Key, 1/4” x 1/4” x 1”
Check to make sure that the power supply to be used is 115-volt single phase.
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