SILENT KNIGHT 4821 Manuel d'installation Page 45

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150964 4-1
Section 4
Control Panel Description and Installation
Warning:
To avoid the risk of electrical shock, do not apply power to the Model 4821/4820 until
you have read these instructions carefully.
This section describes how to install the control panel and some accessories, including com-
patible add-on modules, such as smoke detectors and signaling devices. In all cases, refer to
the compatible module’s installation manual for complete information. (Some Silent Knight
compatible modules have separate installation manuals. See Section 1.1.1 for location of
installation instructions for Silent Knight products.)
4.1 Environmental Specifications
Temperature range is 32° to 120° F (0° to 49° C).
Indoor use only.
85 percent non-condensing humidity.
Non-corrosive environment.
4.2 Electrical Specifications
Line voltage: 110-120 VAC, 60 Hz
Transformer output:
(Model 9227)
18 VAC, 50 VA
Current requirements: 3.0A
Total alarm current: 2.25A
IMPORTANT!
All circuits are power limited, Class II, except for the battery leads.
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