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Integrated Fire Protection System
D
Vacuum Supply Section - Vacuum Sprinkler System - Electric Release
FM-060M-0-89C
1- Vacuum supply
Note:
Numbers indicated between brackets refer to items
on the
TRIM SCHEMATICS
from this section and section
B
MECHANICAL
.
Vacuum sprinkler system uses negative vacuum pressure to
supervise the piping network. The vacuum supply is
provided within the
F
IRE
F
LEX
®
VACTEC
®
unit. The vacuum
supply trim is factory assembled in the system cabinet,
calibrated and pressure tested.
The vacuum supply system trim includes a liquid ring
vacuum pump
(G1)
, all regulating devices to control flow of
water and pump motor shut off electrical components.
The vacuum pump
(G1)
power requirement is specified at
220/240VAC, 50/60Hz, 1.5HP, 1phase.
The vacuum pump
(G1)
is able to establish the total required
vacuum pressure in 30 minutes for system capacity up to
4000 gallons.
1.1 Operation
The start and stop adjustments of the vacuum pump
(G1)
are factory set and require no further adjustments. The
pump motor is controlled by a contactor
(G17)
which is
activated on and off by the
FLX-PC
®
(G18)
VACUUM /
PRESSURE CONTROLLER
.
The liquid ring of the vacuum pump
(G1)
is generated by a
water line composed by a water ring control valve
(G13)
, a
solenoid valve
(G2)
, a pre-regulator
(G3)
, a fine-adjust
regulator
(G4)
and a restricted orifice
(G5)
. A float check
valve
(G6)
and a reversed check valve
(G11)
prevent flood
through possible water coming from drain collector.
Vacuum is sucked from the piping network through the
2-way check valve
(G7)
. This check valve allows vacuum to
be sucked, but will prevent water to enter the vacuum
pump
(G1)
when deluge valve
(A1)
is opened.
When the piping network has been drained after operation,
the remaining water inside the deluge valve
(A1)
will be
drained out by the operation of the vacuum pump
(G1)
.
To apply vacuum supply:
Switch ON the vacuum pump
(G1)
On/Off switch
(G16)
.
To close vacuum supply:
Switch OFF the vacuum pump
(G1)
On/Off switch
(G16)
.
1.2 Pressure settings
All pressure settings are factory set and do not need further
calibration unless malfunction.
a)
FLX-PC
®
(G18)
set to -140 mBAR (-14 kPa) for
LOW
PRESSURE
supervisory condition.
b)
FLX-PC
®
(G18)
set to -220 mBAR (-22 kPa) for
HIGH
PRESSURE
supervisory condition.
c)
FLX-PC
®
(G18)
set to -130 mBAR (-13 kPa) for
ALARM
PRESSURE
condition.
d)
FLX-PC
®
(G18)
set to -150 mBAR (-15 kPa) for vacuum
pump
(G1)
start.
e)
FLX-PC
®
(G18)
set to -180 mBAR (-18 kPa) for vacuum
pump
(G1)
stop.
f) Pre-regulator
(G3)
set to 50 PSI (344 kPa) via pre-
regulator pressure gauge
(G14)
.
g) Fine-adjust regulator
(G4)
set to 10 PSI (69 kPa) via
fine-adjust regulator pressure gauge
(G15)
.
h) Vacuum breaker valve
(G9)
set to -300 mBAR (-30 kPa)
i) Vacuum breaker valve
(G12)
set to -200 mBAR (-20 kPa)
1.3 Maintenance and inspection
If the vacuum pump
(G1)
is hard to start, too much water
could be present in the deluge valve
(A1)
system. To fix this
problem, close vacuum system and open system drain
valve
(G10)
until all water has been drained out. Close the
system drain valve and apply vacuum supply.
If the vacuum pump
(G1)
doesn't start at all, contactor
(G17)
may have tripped. Open the junction box cover of the
vacuum pump controller and reset the contactor (refer to
section
E
CONTROLS
). Reinstall the junction box cover.
The
FLX-PC
®
(G18)
VACUUM / PRESSURE CONTROLLER
is
equipped with an hour counter which reveals the operating
time of the vacuum pump
(G1)
. During regular maintenance,
verify the counter to see if the vacuum pump
(G1)
is
activated often. If so, this could point to an excessive leak in
the piping network.
The vacuum pump
(G1)
is fitted with "sealed for life" bearing
and should provide maintenance free life.
The vacuum pump
(G1)
is fitted with single acting
mechanical seals. These seals should be replaced when
worn, scratch or cracked. Replacement is also necessary
when rotating portion of the seal does not firmly grip the
shaft.
If the vacuum pump
(G1)
is to be out of service for extended
period of time, it should be internally protected from rusting
by using a suitable water soluble rust inhibitor, available from
Busch GVT. This will give protection for up to twelve (12)
months. Rotate the pump by hand to coat the interior of the
pump surfaces with the fluid. The pump should be revolved
periodically to prevent bearing indentation.
For more information, refer to Vacuum Pumps Dolphin
LX 0300-0430 A Installation and Operating Instructions.
