F
IRE
F
LEX
®
N
2
B
LAST
®
Integrated Fire Protection System
O
WNER
'
S
O
PERATION
&
M
AINTENANCE
M
ANUAL
Page 16 of25
FM-076B-0-6A
5. PREACTION AIR SUPPLIES
5.1 Direct air compressor (Style “A”)
Used only for the sprinkler piping network of the preaction
system. Air supply style "A" includes the air compressor
mounted inside the
F
IRE
F
LEX
®
N
2
Blast
®
cabinets with its
supervisory trim and options. Compressors are of the
tankless, oiless piston type and are factory piped to the
sprinkler system riser, all within the
F
IRE
F
LEX
®
N
2
Blast
®
cabinets.
Compressors are available in four (4) sizes:
1/6HP
1/2HP
1/3HP
1HP
3
TO PNEUMATIC ACTUATOR
(plugged when not used)
E4
(plugged with
SureFire trim)
TO SPRINKLER RISER
E9
E10
Copper tubing
E12
E3
E1
This section replaced
by Dehydrator option A
(when used)
TO OPTIONAL ACCELERATOR
(plugged when not used)
FM-061H-0-118B
1
CONTRACTOR'S
HYDROSTATIC TEST PORT
(system side)
2
E2
E11
TO DRAIN COLLECTOR
Compressor Service Factor Amp (S.F.A) rating
Compressor
Size (HP)
115Vac / 60Hz 230Vac / 60Hz 220Vac / 50Hz
1/6 5.0
Amp.
2.5
Amp. 1.3
Amp.
1/3 7.4
Amp.
3.7
Amp. 2.5
Amp.
1/2 10.0
Amp.
5.0
Amp. 4.0
Amp.
1 18.0
Amp.
9.0
Amp. 6.0
Amp.
115 / 230 Vac – 60Hz air compressor selection Table:
H.P
CFM
@
40 PSI
System capacity to
fill system to 35 PSI
in 30 minutes
*
System capacity to
fill system to 55 PSI
in 30 minutes
**
1/6
1.33
142 gal.
90 gal.
1/3
2.61
285 gal.
181 gal.
1/2
4.06
417 gal.
265 gal.
1
7.40
702 gal.
447 gal.
* For systems with maximum water supply
pressure of
175 PSI (1206 kPa)
** For systems with water supply pressure
between
175 PSI (1207 kPa) and 250 PSI (1724 kPa)
WARNING
The information contained herewith is for
estimation and evaluation purposes only. Its use remains
the responsibility of the designer.
Table 5. - Pressure adjustments
System type
Air supply
style
Air
regulator
Compressor
Start
Compressor
Stop
Low air
supervisory
A n/a
20 psi
(1.38 bar)
35 psi
(2.42 bar)
25 psi
(1.73 bar)
Double interlocked
electric/pneumatic
Water pressure up to
175 psi (12.1 bar)
B
35 psi
(2.42 bar)
n/a n/a
25 psi
(1.73 bar)
A n/a
40 psi
(2.76 bar)
55 psi
(3.80 bar)
45 psi
(3.11 bar)
Double interlocked
electric/pneumatic
Water pressure 175 to
250 psi (12.1 to 17.2 bar)
B
55 psi
(3.80 bar)
n/a n/a
45 psi
(3.11 bar)
