Unipower ARR-M Series - 5. VENTILATION AND COOLING

BATTERY CHARGER USER’S MANUAL PART-1:INSTALLATION
MCEnPC23-REV.2.4 Page 3
Warning
Battery application and maintenance:
Your battery is a crucial back up for your critical application. Special care and appropriate safety and maintenance
procedures must be implemented.
Please refer to the battery manufacturer instructions and the applicable battery installation, maintenance, testing and
replacement standards for stationary application in order to optimize the life of the battery as well as to determine when
the battery should be replaced.
VRLA case (Lead Acid battery incorrectly called "maintenance free"): As this battery is sealed not allowing visual
inspection or water addition, dry out and thermal runaway inside the battery can happen resulting to an unpredictable
failure occurrence. Great care in installation, maintenance, testing and replacement is required to insure availability of
backup power.
The manufacturer instruction, your local standards and the following standards can be your guide to help to apply
proper procedures: (other standards may apply).
IEEE484: IEEE Recommended Practice for Installation Design and Installation of Vented Lead-Acid Batteries for
Stationary Applications.
IEEE450: IEEE Recommended Practice for Maintenance, Testing, and Replacement of Vented Lead-Acid Batteries for
Stationary applications.
IEEE1188: IEEE Recommended Practice for Maintenance, Testing, and Replacement of Valve-Regulated Lead-Acid
(VRLA) Batteries for Stationary Applications.
IEEE1106: IEEE Recommended Practice for Installation, Maintenance, Testing and Replacement of Vented Nickel-
Cadmium Batteries for Stationary Applications.
5. VENTILATION AND COOLING
The rectifier/charger is rated to better perform within 18F (–10C) and 122F (+50C) temperature range.
To calculate the required air displacement (exchange) volume, please use the following equation:
kr
T
Tk
H
TT
e
BTUV


0
125.0
V = air flow: [cubic meter/hour]
BTU: Total dissipated heat
T
r
: Maximum allowed room temperature [K] {i.e. 50C = 323K]
T
k
= Temperature of input cooling air
T
o
= 273 K
H = Altitude [km]
WARNING!
Avoid placing the system in direct sunlight
The adequate ventilation and safe access require that the following clearances are respected:
 3 in. (10 cm) on the sides and top;
 3 feet (1 meter) in front of the unit;
 DO NOT INSTALL OVER COMBUSTIBLE SURFACES;
Should seismic conditions require a more secure installation the unit can be bolted to the floor. Four (4) holes are provided for
this purpose.