User's Manual

Maintenance
September 2013 6-4 P/N 81-CO2MAN-001
Figure 6-1. Nitrogen Temperature vs. Pressure Data
6-4 SEMI-ANNUAL WEIGHING OF CO
2
CYLINDERS
6-4.1 Weighing (using Kidde Fire Systems Weigh Scale)
Use the following steps to weigh the cylinder by using the weighing scale 
(P/N 81-982505-000).
1. Remove control head(s) at the coupling nut only. When tandem heads are used, back off
each head at the same time before attempting to completely remove both heads from the
cylinders.
The flexible hose must remain connected to the discharge head.
2. Loosen the cylinder from the framing, leaving the framing components connected to each
other while allowing free vertical movement of the cylinder.
3. Hook scale on weighing angle, and slip yoke under discharge head. Adjust as shown on
Figure 6-2.
WARNING
The CO
2
cylinders are equipped with a high flow rate discharge valve, which
when actuated, will open, remain open, and can not be closed. Accidental
actuation of the discharge valve on an unsecured, disconnected cylinder will
result in a discharge thrust capable to causing severe property damage and
bodily injury.
It is therefore extremely important that the exact sequence of cylinder removal
and installation always be followed. Cylinder removal or cylinder installation
must always be supervised to assure full compliance with the instructions in
this manual.
TEMPERATURE °F
N PRESSURE - TEMPERATURE CHART
2
PRESSURE PSIG
-40° 40° 60°-20° -20°0° 80° 100° 120° 140°
1200
1300
1400
1500
1600
1700
1800
1900
2000
2100
RECHARGE
NOMINAL PRESSURE
MINIMUM ALLOWABLE PRESSURE