RKI Instruments 49-8103RK - Manual (Page 4)

49-8103RK Standby Battery • 4
Housing
The standby battery’s fiberglass housing is weather- and corrosion-resistant. It is suitable
for installation where general purpose equipment is in use. The housing door is hinged on
the left side and is secured by two latches on the right side. Four mounting feet are
attached to the back of the housing (one at each corner). The mounting feet allow you to
install the housing to a vertical surface. A conduit hub on the top of the housing is for
external wiring connections. A weather-resistant vent on the upper left side prevents
buildup of hydrogen in the housing if it is vented by the batteries.
Batteries
Two lead acid 12 VDC, 1.2 AH batteries are installed into the housing with adhesive
backed self-locking strip fasteners. For each battery, one side of the strip fastener is
installed on the back of the inside of the housing and the other side is installed on the back
of the battery. When the battery is pushed firmly onto the strip fastener in the housing, the
two sides of the fastener click together to retain the battery.
The two batteries are connected to each other in series by a factory installed wire jumper
so that they produce 24 VDC. Two factory installed wires allow connection to the positive
and negative of the standby battery. The ends of these wires are covered with insulating
shrink tubing to prevent shorting during shipment. These pieces of shrink tubing will
have to removed during installation of the standby battery (see “Wiring the Standby
Battery to a Controller” on page 5).
Wire Nuts
Three wire nuts are provided with the standby battery for wiring connections. The wire
nuts are shipped in the standby battery packaged in a small plastic bag. Only two wiring
connections will have to be made to the standby battery (see “Wiring the Standby Battery
to a Controller” on page 5), so one of the wire nuts is provided as an extra in case one is
lost or damaged.
Installation
This section describes procedures to mount the standby battery and wire it to a controller.
Mounting the Standby Battery
1. Select a mounting site close to the controller that requires standby power. Consider
the following when you select the mounting site.
• Select a site where the standby battery is not likely to be bumped or disturbed.
Make sure there is sufficient room to perform maintenance procedures.
• The conduit hub on the top of the standby battery housing makes wiring to a
controller convenient if the standby battery is mounted below a controller
2. Open the standby battery door and remove any packing materials from the housing.
Be careful not to lose the three wire nuts that are provided for wiring connections.
3. Verify that the two batteries have not come loose during shipment and are still firmly
installed.
If one or both of the batteries is loose, line up the self-locking strip on the bottom of
the battery with the strip on the back of the housing and push the battery onto the
strip firmly. You should feel a “click” when the two strips engage and lock.
4. Close and latch the standby battery housing door.