Powerex • 150 Production Drive • Harrison, OH 45030 • USA
P 1.888.769.7979 • F 513.367.3125 • www.powerexinc.com
IN599102AV • 15 September 2020
Page 26 of 36
FirstCall™ Medical Gas Alarm
Operating & Maintenance Manual
To disable the screen saver, press the “DISABLE
SCREEN SAVER” button.
Screen brightness is set to 50% from the factory.
This can be changed higher or lower depending on
preference.
To maximize the lifespan of the screen, Powerex
advises that the screen saver remain enabled and the
default screen brightness be no higher than 50%.
Transducer Settings
The Powerex FirstCall™ Area and Combo Alarm
Systems come with the ability to adjust the displayed
value of the pressure, as well as override the standard
pressure range of the installed transducer.
For example, if the transducer reads 52, and the
desired display is 50, enter 2 under “display offset.”
Use the arrows at the bottom to scroll through the
different transducers if there are more than 2.
The Transducer Range settings should never have to
be overridden by a user. If an alarm panel is required
to be expanded with a new gas that falls outside the
standard range, please contact Powerex Technical
Service for instruction
Test & Set High/Low Alarm Points to +/- 20% Current
Pressure
This unique feature easily allows for compliance
with NFPA 99 2018 edition 5.1.9.4.2, stating that Area
Alarm Panels for medical gas systems shall indicate if
the pressure in the lines in the area being monitored
increases or decreases by 20 percent from the normal
line pressure.
The Powerex FirstCall™ Alarm System will automatically
calculate the high/low set points based on the current
pressure measured by the transducers.
The low limit for Medical Vacuum and WAGD systems
will still stay at 12” Hg even when this feature is used.
The high/low settings will also appear on the gas
badge on the home screen for 5 seconds.
BACNet Settings
Enter desired device name – must be exactly 6
characters. Default name is always PWXPLC.
Enter desired Device ID number – any number
between 0 and 255.
Address for the PLC is already preloaded, but is able
to be changed if required.
Subnet Mask is defaulted to 255, 255, 255, 0 – this
can be changed if required.
Default Gateway is set at 0, 0, 0, 0 – this can be
changed if required.
Press “Apply” to save settings, and the PLC will reboot
after pressing “OK.”
See the BACNet Object Names chart in Appendix
A for list of abbreviated names for alarm conditions,
gas pressures, and set points that will display on the
BACNet explorer.
Summary of Contents for AAP10-OAV
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