Applying Power (Ac And Battery); Lithium Batteries - DSC MAXSYS PC4020 Installation Manual

2.13 Applying Power (AC and Battery)

WARNING: Do not connect the battery or trans-
former until all other wiring is complete.
Battery Connection – Red and Black Battery
Leads
Connect the red battery lead to the positive terminal of
the battery and the black lead to the negative terminal.
WARNING: Observe the correct polarity. If the battery
is connected backwards, the panel will not operate.
AC Power Terminals
WARNING: Connect the battery before connecting
the AC.
A 16.5V, 40 VA transformer connected to an unswitched
AC power source should be wired to these terminals.
To achieve the rated outputs as previously described, the
AC input must be connected to the secondary of a trans-
former rated at 16 VAC, 40VA minimum. The trans-
former is not supplied with the equipment and must be
mounted outside the cabinet.
Do not connect the transformer primary to an outlet that
is controlled by a switch.
The PC4020 monitors the presence of AC. Upon the loss
of AC power a trouble condition will be generated. The
keypad trouble light will turn on. If programmed, the
keypad will also beep. For more information regarding
AC options, see Section 10.1 "AC/DC Power Options."
Applying Power to the Main Panel
Once all field wiring has been completed and checked
for opens, shorts and grounds, power can be applied to
the panel as follows:
1. Connect the battery leads.
2. Connect the AC transformer.
The panel will not power up correctly if AC power is
applied before the battery is connected.
Battery Selection Charts
The charts below are to determine the battery required to
support the main panel for either 24 hours or 60 hours in
the standby mode. The battery size is measured in amp
hours (Ah). To determine the appropriate battery size,
perform the following:
8
1. Calculate the total current required when the panel is
not in alarm. This is the standby current. See Section
2.3 for further information on current calculation.
2. Determine the current that will be drawn when the
panel is in alarm.
3. On the chart below, find the standby current on the hor-
izontal axis and the alarm current on the vertical axis.
4. Find the region of the chart where the standby current
and the alarm current values intersect. The region cor-
responds to the required battery Ah capacity.
For example:
Standby current = 500 mA
Alarm current = 2 A
On the 24Hr chart, the battery capacity required is 14Ah.

2.14 Lithium Batteries

The PC4020 circuit board includes a lithium battery.
(Please see the wiring diagram on page ii.) This battery is
not replaceable. There is a danger of explosion if the bat-
tery is incorrectly replaced.
If the lithium battery stops working, return the circuit
board to DSC Ltd. Batteries may cause a fire when in
contact with metal. If you need to dispose of the circuit
board and/or the lithium battery, wrap the battery in
non-conductive tape. Check with your local government
for battery disposal regulations.
WARNING: Do not store the batteries in such a way
that they come into contact with each other or with
any piece of metal. Explosion or fire may occur.
Should fire occur, use only dry chemical fire extin-
guishers. Do not use water to put out the fire.
Do not heat the batteries. Do not dispose of the bat-
teries or circuit boards in a fire. Do not disassemble
the batteries. Do not apply pressure to or deform the
batteries. Ensure that the above precautions are
strictly observed by related departments, including,
but not limited to, production, sales and outside con-
tractors.