T
OTAL
P
AC
®
3
Page 1 of 12
Integrated Fire Protection System
D
Air Supply - Preaction System
FM-076A-0-86C
1. Cabinet Air Supplies
Preaction sprinkler system using air pressure for
supervisory or releasing purposes is provided with either
internal or external supervised air supply.
WARNING
Pressures other than the factory pressure
settings may affect the operation of the system.
Four (4) styles of air supplies are available for the
T
OTAL
P
AC
®
3
units depending on needs or configurations.
These air supplies are all factory assembled, mounted in
the cabinet and pressure tested. Following is the
description of those options.
1.1 Air supply Style "A"
(refer to figure 2)
Used only for the sprinkler piping network of preaction
systems. Air supply style "A" includes the air compressor
mounted inside the
T
OTAL
P
AC
®
3
cabinet with its
supervisory trim and options. Air compressor is of the
oilless piston type without reservoir and is factory piped to
the sprinkler piping system riser, all within the
T
OTAL
P
AC
®
3
cabinet.
A factory wired isolation switch (see figure 2 in section
E
CONTROLS SECTION
) is also provided in the
T
OTAL
P
AC
®
3
cabinet, allowing powering off the air compressor while
some maintenance work on the unit is done, without
disturbing the rest of the system.
To connect non-energized AC power to the air
compressor, refer to field wiring diagram (see section
F
ELECTRICAL SECTION
).
Table 1 - Air compressor F.L.A. (full load amp) rating
Air compressor
size
115Vac
60Hz
208Vac
60Hz
230Vac
60Hz
1/6 HP
5.0 Amp
2.3 Amp
2.5 Amp
1/3 HP
7.4 Amp
3.5 Amp
3.7 Amp
1/2 HP
10.0 Amp
4.9 Amp
5.0 Amp
1 HP
18.0 Amp
7.7 Amp
9.0 Amp
1.5 HP
16.6 Amp
8.2 Amp
8.3 Amp
2 HP
n/a
11.6 Amp
11.0 Amp
Air compressor
size
220Vac
50Hz
240Vac
50Hz
0.12 KW
1.3 Amp
1.3 Amp
0.25 KW
2.5 Amp
2.6 Amp
0.56 KW
4.0 Amp
4.5 Amp
1.2 KW
6.0 Amp
6.0 Amp
1.5 KW
6.3 Amp
6.0 Amp
Note :
Selection of the appropriate wire size is the
responsibility of the installing contractor.
1.2 Air supply Style "B"
(refer to figure 3)
Used only for the sprinkler piping network of preaction
system, when an external air supply is provided by others
(either a compressor, plant air or dry nitrogen cylinders)
and piped to the air inlet port of the unit.
Air supply style "B" provides an APMD (air pressure
maintenance device) trim, factory mounted in the
T
OTAL
P
AC
®
3
cabinet. The APMD regulates and restricts
the inlet pressure. It allows an outlet pressure range from
5 PSI to 75 PSI (34 kPa to 517 kPa) ±2 PSI (14 kPa). An
internal ball check valve prevents back flow.
Warning :
When air supply style "B" is selected, the air
supply should be provided and installed by the sprinkler
contractor OUTSIDE of the
T
OTAL
P
AC
®
3
cabinet. Air
supply is NOT provided with the unit.
1.3 Air supply Style "C"
(refer to figure 4)
Used only for the pilot line release. An external air supply
has to be provided by others (compressor, plant air or dry
nitrogen cylinders) and piped to the air inlet port of the unit.
Air supply style "C" provides an APMD (air pressure
maintenance device) trim, factory mounted in the
T
OTAL
P
AC
®
3
cabinet. The APMD regulates and restricts
the inlet pressure. It allows an outlet pressure range from
5 PSI to 75 PSI (34 kPa to 517 kPa) ±2 PSI (14 kPa). An
internal ball check valve prevents back flow.
Warning :
When air supply style "C" is selected, the air
supply should be provided and installed by the sprinkler
contractor OUTSIDE of the
T
OTAL
P
AC
®
3
cabinet. Air
supply is NOT provided with the unit.
1.4 Air supply Style "D"
(refer to figure 5)
Mainly used with preaction system protecting refrigerated
spaces and freezers, where a special dry external air
supply unit is piped directly to the system riser inside the
freezer itself, as shown in NFPA-13. Air supply style "D"
provides only an air supervisory and shut-off trim.
Ambient temperature at the special external air supply unit
location should not exceed 104°F (40°C). Refer to NFPA
and Factory Mutual Codes & Standards for details on
refrigerated spaces applications. Air supply style "D" can
also be used when the contractor prefers to provide his
own air supply & regulation trim, mounted outside the
T
OTAL
P
AC
®
3
cabinet.
Note :
External air supply MUST always be restricted to
insure that the air supply cannot replace air as fast as it
escapes when an automatic sprinkler operates.
Warning :
When air supply style "D" is selected, the air
supply should be provided and installed by the sprinkler
contractor OUTSIDE of the
T
OTAL
P
AC
®
3
cabinet. Air
supply is NOT provided with the unit.
