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SYSTEM 238 Installation Manual

Earth Ground

To ensure the effectiveness of the lightning and transient protection

circuits, the control panel must be connected to "Earth Ground".

Ideally, this should be a common ground to the power lines, telephone

system, and security system. This type of ground, called a "Unified

Earth Ground", provides the best protection. The ground connection,

from a grounding rod, cold water pipe or other established ground

point, is made to the green jacketed wire providing a ground to the

panel housing.

WIRING THE PANEL

Standby Battery

The SYSTEM 238 is designed to operate with a 12 volt, 6.5 Ah, sealed

lead-acid battery (C&K Model 1265). Do not use non-rechargeable

batteries or batteries other than sealed lead-acid. It is recommended

that you replace the standby battery every three to five years.

Connect the red lead to the battery positive terminal and the black lead

to the battery negative. The battery is reverse-polarity protected by

a 3 AG, 3 amp, fast-blow fuse (F4).

Connecting to

Earth Ground

Power

Lines

Control

Panel

Unified Earth Ground

with Bonded Ground Roots

Telephone

Earth Ground

Power Line

Earth Ground

Telephone

Lines

Terminal Label:

AC power is supplied by a 16.5 VAC, 25 - 40

VA transformer at 50 or 60 Hz. The transformer

must be a UL listed Class 2 transformer. Connect

the secondary of the transformer to the terminals

labelled AC. Use at least 18 AWG (1.02 mm) wire to reduce voltage

drops. The primary side of the transformer must be connected

to an unswitched receptacle. Do not connect primary to

Ground-Fault-Interrupt (GFI) circuits. Secure the transformer

to the wall.

AC POWER

AC Power Failure

If an AC power failure lasts more than 15 minutes, the keypads will

display a system trouble. An AC failure report will be sent, if pro-

grammed. When AC is restored for five minutes, a restoral report will

be sent.

Precautions

Do not share the secondary of the transformer with other

devices. A foreign ground can damage the power

supply, voiding the warranty.

Do not use any transformer other than that specified in

the AC POWER section above.

Available Power

The maximum total power available from the Audible, AUX (Switched

and Unswitched), and Keypad is 800 mA. The switched auxiliary,

unswitched auxiliary, and keypads share the same power bus.

Combined power for these outputs should not exceed 500 mA.

NOTE: The 50 mA switched power available on Loop 8 is

part of the total 500 mA AUX power.

Terminal Label:

BELL & C

AUDIBLE OUTPUT

The BELL terminal provides up to 1.3 amps at

10.5 - 13.5 VDC . The type of voltage (steady,

pulsed, chirp) and the time is programmable.

Fuse F1

The BELL terminal is protected by a 2.5 amps, 3 AG fast-blow fuse

(F1).

NOTE: If any fuse opens, remove AC and DC power, remove

the short or overload condition, then replace the fuse

before restoring power. Do not substitute a higher

rated fuse.

Electromagnetic Interference

Vibrating horns can produce electromagnetic interference (EMI).

While EMI will not damage the SYSTEM 238, it can cause transmission

errors and mis-dialing. To minimize EMI, install a 0.01 mfd, 100 volt

capacitor across the terminals of the horn. The capacitor must be

located in the horn.

AUXILIARY POWER

The SW/AUX terminal provides positive 10 - 12.5

VDC power for devices that require switched power

for resetting. Typical devices are glass-break and

smoke detectors.

The C terminal provides power common.

The AUX terminal supplies uninterrupted positive power.

Fuse F2

The SW/AUX and AUX terminals are protected by a 0.75 amp, 3 AG,

fast-blow fuse (F2).

ARMING STATIONS

Connect the keypad to the System 238 control panel as shown in the

diagram at the top of the next page.

Maximum wire length for connecting any keypad is 500' (152 m) of 22

AWG (0.643 mm) copper wire.

Terminal Labels:

SW/AUX, C & AUX

Terminal Labels:

C, KEY+, DATA, & CLK

The KEY+ terminal (red) provides 11 - 14 VDC

keypad power.

The DATA terminal (green) is data from the

keypad to the panel.

The C terminal (black) is common.

The CLK terminal (white) is the clock line.

1 2 3 4 5 6 7 8 ... 27 28

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