Installation manual

SYSTEM 238 Installation Manual
3
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
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.