Manual

11
VRLA batteries when subjected to extreme overcharge (above the
recombinant ability of the cell) can release hydrogen gas at a
maximum rate of 0.000269 cubic feet per minute per ampere of
charging current at 77°F (25°C) at atmospheric pressure.
3.3 Rack Assemblies
Liberty Series 1000 batteries may be installed in a variety of
mounting assemblies
• Modular Rack assembly (Figure 3.1) - battery units may be assem-
bled in a floor mounted module or rack. One modular rack available
from C&D Technologies, Inc. is designed to mount the units in a
sturdy open frame that is stackable. They are available in 29" and
43" (74 cm and 109 cm) lengths. Optional panels are available to
enclose the racks, providing a cabinet-like appearance. (Figure 3.2)
For additional information refer to specification 12-373 and 12-380.
• When large numbers of batteries are required for the application
and a dedicated battery room may be provided, conventional tiered
rac
ks may be appropriate.
3.4 Relay Rack Assemb
ly
• Battery units can be mounted in standard 19" and 23" (48 cm and
58 cm) relay rac
k fr
ames. A typical C&D Technologies “tray layout” is
shown in Figure 3.3.
Specially designed trays/fixtures should be
ordered for relay rack applications.
3.5 Optional Steel Jackets for Batteries/Units operating in a
demanding environment
Although a metal jacket cannot change the thermal degradation or
electro/chemical properties of the battery exposed to elevated
temper
atures, it will physically contain the cells exposed to elevated
temperatures by retaining compression on the positive and negative
plates and absorbent glass mat between the plates. The net effect and
pur
pose is that the plates are pro
vided with a uniform exposure to the
contained electrolyte
.
Note: Optional steel jackets are recommended if the batteries are
e
xpected to e
xperience frequent periods of operation at
temperatures in excess of 90°F (33°C).
FIGURE 3.1 - Modular Rack Assembly
FIGURE 3.2 - Modular Rack With Panels
FIGURE 3.3 - Relay Rack Trays